We shouldn't have needed lockfiles(tonsky.me)
tonsky.me
We shouldn't have needed lockfiles
https://tonsky.me/blog/lockfiles/
298 comments
When I used to lead a Maven project I'd take dependency-upgrade tickets that would just be me bumping up a package version then whack-a-moling overrides and editing callsites to make dependency resolution not pull up conflicting packages until it worked. Probably lost a few days a quarter that way. I even remember the playlists I used to listen to when I was doing that work (:
Lockfiles are great.
Lockfiles are great.
> I even remember the playlists I used to listen to when I was doing that work (:
Im a big fan of anything Aphex Twin for these type of sessions.
Im a big fan of anything Aphex Twin for these type of sessions.
How do lockfiles solve this problem? You would still have dependency-upgrade tickets and whack-a-mole, no? Or do you just never upgrade anything?
I think the difference is that since libraries do not specify version ranges, you must manually override their choices to find a compatible set of dependencies.
The solution is version ranges, but this then necessitates lockfiles, to avoid the problem of uncontrolled upgrades.
That said, there's an option that uses version ranges, and avoids nondeterminism without lockfiles: https://matklad.github.io/2024/12/24/minimal-version-selecti....
Note: maven technically allows version ranges, but they're rarely used.
The solution is version ranges, but this then necessitates lockfiles, to avoid the problem of uncontrolled upgrades.
That said, there's an option that uses version ranges, and avoids nondeterminism without lockfiles: https://matklad.github.io/2024/12/24/minimal-version-selecti....
Note: maven technically allows version ranges, but they're rarely used.
The difference is that the data is centralized with a single source of truth, and you have tools for working with it automatically. It doesn't mean lockfiles are cheap to update, but it does mean it's a much more streamlined process when it's time.
The data is also centralized without lockfiles though...it's in the package spec file itself, where all version can be upgraded together. If you are saying the only difference is some tooling for automation, that's a temporary problem, not a fundamental one.
By "centralized" I mean a single file that contains all transitive dependency version information and nothing else. This is very different than having to recursively examine tiny portions of your dependencies' package specs recursively to find all transitive dependencies.
Without a lock file your transitive dependencies are.... by definition not centralised?
Or have I misunderstood?
Or have I misunderstood?
you press a button which triggers a pipeline which does npm update on all root dependencies and produces a new lockfile, then creates a PR you need to approve. creating a PR triggers running all the tests you bothered to write to also flag things that didn't go well automagically.
Is this a joke? What's the difference between this and pressing a button which triggers a pipeline which does npm update on all root dependencies and produces a new package.json file which you approve in a PR? Is the only difference that some convenient tooling already exists so you don't have to update each root dependency by hand?
A package spec defines your desires for your dependencies, a lockfile defines a resolution of those desires.
For example, as a developer I want Spring to stay on 6.3.x and not suddenly jump to 6.4 - as that is likely to break stuff. I do not care whether I get 6.3.1 or 6.3.6, as they are quite unlikely to cause issues. I do not care the slightest what version of libfoobar I get 5 dependencies down the line.
However, I do not want packages to suddenly change versions between different CI runs. Breakage due to minor version bumps are unlikely, but they will happen. That kind of stuff is only going to cause noise when a rebuild of a PR causes it to break with zero lines changed, so you only want version upgrades to happen specifically when you ask for them. On top of that there's the risk of supply chain attacks, where pulling in the absolute latest version of every single package isn't exactly a great idea.
The package spec allows me to define "spring at 6.3.x", the lockfile stores that we are currently using "spring 6.3.5, libfoobar 1.2.3". I ask it to look for upgrades, it resolves to "spring 6.3.6, libfoobar 1.4.0". There's also a "spring 6.4.0" available, but the spec says that we aren't interested so it gets ignored. All tests pass, it gets merged, and we'll stay at those versions until we explicitly ask for another upgrade.
The whole flow exists for things which aren't root dependencies. The major versions of those are trivial to keep track of manually, and you'll only have a handful of them. It's all the minor versions and downstream dependencies which are the issue: tracking them all manually is a nightmare, and picking whatever happens to be the latest version at time-of-build is a massive no-no.
For example, as a developer I want Spring to stay on 6.3.x and not suddenly jump to 6.4 - as that is likely to break stuff. I do not care whether I get 6.3.1 or 6.3.6, as they are quite unlikely to cause issues. I do not care the slightest what version of libfoobar I get 5 dependencies down the line.
However, I do not want packages to suddenly change versions between different CI runs. Breakage due to minor version bumps are unlikely, but they will happen. That kind of stuff is only going to cause noise when a rebuild of a PR causes it to break with zero lines changed, so you only want version upgrades to happen specifically when you ask for them. On top of that there's the risk of supply chain attacks, where pulling in the absolute latest version of every single package isn't exactly a great idea.
The package spec allows me to define "spring at 6.3.x", the lockfile stores that we are currently using "spring 6.3.5, libfoobar 1.2.3". I ask it to look for upgrades, it resolves to "spring 6.3.6, libfoobar 1.4.0". There's also a "spring 6.4.0" available, but the spec says that we aren't interested so it gets ignored. All tests pass, it gets merged, and we'll stay at those versions until we explicitly ask for another upgrade.
The whole flow exists for things which aren't root dependencies. The major versions of those are trivial to keep track of manually, and you'll only have a handful of them. It's all the minor versions and downstream dependencies which are the issue: tracking them all manually is a nightmare, and picking whatever happens to be the latest version at time-of-build is a massive no-no.
The difference is transitive dependences with ranges, which results in less frequent updates of direct dependences. And tooling of course too
If you use two dependencies, and one requires Foo 1.2.3 and the other Foo 1.2.4 then 99% of the time including either version of Foo will work fine. (I was a Java developer and used Maven for about 10 years.)
For those times where that's not the case, you can look at the dependency tree to see which is included and why. You can then add a <dependency> override in your pom.xml file specifying the one you want.
It's not an "insane" algorithm. It gives you predictability. If you write something in your pom.xml that overrides whatever dependency your dependency requires, because you can update your pom.xml if you need to.
And because pom.xml is hand-written there are very few merge conflicts (as much as you'd normally find in source code), vs. a lock file where huge chunks change each time you change a dependency, and when it comes to a merge conflict you just have to delete the lot and redo it and hope nothing important has been changed.
For those times where that's not the case, you can look at the dependency tree to see which is included and why. You can then add a <dependency> override in your pom.xml file specifying the one you want.
It's not an "insane" algorithm. It gives you predictability. If you write something in your pom.xml that overrides whatever dependency your dependency requires, because you can update your pom.xml if you need to.
And because pom.xml is hand-written there are very few merge conflicts (as much as you'd normally find in source code), vs. a lock file where huge chunks change each time you change a dependency, and when it comes to a merge conflict you just have to delete the lot and redo it and hope nothing important has been changed.
> You can then add a <dependency> override in your pom.xml file specifying the one you want.
Isn't that basically a crappy, hand-rolled equivalent to a lock file?
Isn't that basically a crappy, hand-rolled equivalent to a lock file?
A single override does not equate to an entire lockfile of dependencies.
And yet, that one manual override and an auto-generated lockfile require basically the same level of effort, and serve the same purpose.
Edit: actually, depending on the package manager, the auto generated lockfile takes less work than the single override, as they don't have the same issue maven does to require an override in the first place.
Edit: actually, depending on the package manager, the auto generated lockfile takes less work than the single override, as they don't have the same issue maven does to require an override in the first place.
Of course it is
What happens when one requires Foo 1.0 and the other requires Foo 2.0, and the two are incompatible on ABI level?
When you are building some app in an ecosystem not entirely managed by you, things like this are bound to happen, so there are always ways to solve this.
You use Foo1 in Project1 (= one pom.xml) and create Project2 (=second pom.xml) where you use Foo2 (but package it in such a way that Foo2 is not exported from Project2), and depending on the usecase create a thin wrapper which you can then use from Project1, as an absolute worst case.
You use Foo1 in Project1 (= one pom.xml) and create Project2 (=second pom.xml) where you use Foo2 (but package it in such a way that Foo2 is not exported from Project2), and depending on the usecase create a thin wrapper which you can then use from Project1, as an absolute worst case.
Then you sit and cry of course
Depending on the dependency, you can also use shadow versions right? Essentially including both versions, and providing each dependency with it's own desired version. I believe it's done with the maven shade plug-in
Never used it myself though, just read about it but never had an actual usecase
Never used it myself though, just read about it but never had an actual usecase
Yes, but if later Dep1 and Dep2 stop depending on Foo you will never know about it.
The irony is that it even has something like lockfiles as well: The <dependencyManagement> section:
> Dependency management - this allows project authors to directly specify the versions of artifacts to be used when they are encountered in transitive dependencies or in dependencies where no version has been specified.
It's just less convenient because you have to manage it yourself.
> Dependency management - this allows project authors to directly specify the versions of artifacts to be used when they are encountered in transitive dependencies or in dependencies where no version has been specified.
It's just less convenient because you have to manage it yourself.
I have YEARS of zero problems with maven dependencias. And yet i cant leave up a node project for more than a month without immediately encountering transitive dependency breakage that take days to resolve.
Maven is dependency heaven.
Maven is dependency heaven.
You might not have issues, but they definitely happen. Especially once you bring in heavy frameworks like Spring, which for some reason ship with a ton of dependencies, some of which are surprisingly outdated.
I had this happen with JUnit after a JDK upgrade. We needed to update to a newer major version of JUnit to match the new JDK, so we updated the test code accordingly. But then things broke. Methods were missing, imports couldn't be resolved, etc. Turned out something else in the dependency tree was still pulling in JUnit 4, and Maven's “nearest-wins” logic just silently went with the older version. No error, no warning. Just weird runtime/classpath issues. This something else turned out to be spring, for some odd reason it was an ancient version of Junit 4 as well.
And yeah, you can eventually sort it out, maybe with mvn dependency:tree and a lot of manual overrides, but it is a mess. And Maven still doesn't give you anything like a lockfile to consistently reproduce builds over time. That's fine if your whole org pins versions very strictly, but it's naive to claim it "just works" in all cases. Certainly because versions often don't get pinned that strictly and it is easy to set up things in such a way that you think you have pinned the version while that isn't the case. Really fun stuff..
I had this happen with JUnit after a JDK upgrade. We needed to update to a newer major version of JUnit to match the new JDK, so we updated the test code accordingly. But then things broke. Methods were missing, imports couldn't be resolved, etc. Turned out something else in the dependency tree was still pulling in JUnit 4, and Maven's “nearest-wins” logic just silently went with the older version. No error, no warning. Just weird runtime/classpath issues. This something else turned out to be spring, for some odd reason it was an ancient version of Junit 4 as well.
And yeah, you can eventually sort it out, maybe with mvn dependency:tree and a lot of manual overrides, but it is a mess. And Maven still doesn't give you anything like a lockfile to consistently reproduce builds over time. That's fine if your whole org pins versions very strictly, but it's naive to claim it "just works" in all cases. Certainly because versions often don't get pinned that strictly and it is easy to set up things in such a way that you think you have pinned the version while that isn't the case. Really fun stuff..
After more than a decade of working on spring projects in fortune 500 companies, I've literally never had this problem with Maven dependencies.
I agree its theoretically possible, but I disagree that its difficult to resolve or somehow "hell". It works extremely well.
I agree its theoretically possible, but I disagree that its difficult to resolve or somehow "hell". It works extremely well.
That's a problem with node's culture, not with lockfiles. I've never experienced the level of bitrot Node suffers from in Rust, Ruby, Go, or PHP, which do have lockfiles.
> encountering transitive dependency breakage
Are you talking about a dependency not declared in your lock file? Or are you talking about a dependency in your lock file being unavailable, ex. no longer in npm, in a months time?
Are you talking about a dependency not declared in your lock file? Or are you talking about a dependency in your lock file being unavailable, ex. no longer in npm, in a months time?
npm got around to `@{author}/{package}` and `@{org}/{package}` beyond just global `{package}`, albeit midstream, rather than very early on. The jargon is "scoped packages". I've seen more adoption recently, also with scopes for particular projects, like https://www.npmjs.com/package/@babel/core
The issue is what happens when libX@latest is updated and uses [email protected] but your other dependency libA@latest uses [email protected]? In maven, crazy things happen. Sometimes it’s fine but if you have any kind of security, the version mismatch has different signatures and blows up. Ask any spring developer what happens when they have more than 1 slf4j in their classpath.
The java ecosystem never went through the level of pain node ecosystem has. For a while it was simply insanity in node. I've worked heavily in both, and the developer experience in java was always way better.
The author of the article asked the same question in his personal blog in Telegram a year and a half ago [1], and received in response exactly the same example with maven. Probably, to build a personal brand and increase visibility, he needs to ask the same thing many times in different places.
1. https://t.me/nikitonsky_pub/597
1. https://t.me/nikitonsky_pub/597
To add: if you would like to avoid depending on Maven's dependency mediation behaviour, then a useful tool is Maven Enforcer's dependencyConvergence rule.
https://maven.apache.org/enforcer/enforcer-rules/index.html
https://maven.apache.org/enforcer/enforcer-rules/index.html
Seems like there's room then in the Maven ecosystem that does what maven-enforcer-plugin does, but which just looks at a lockfile to make its decisions.
The point isn't, "There are zero problems with maven. It solves all problems perfectly."
The point is, "You don't need lockfiles."
And that much is true.
(Miss you on twitter btw. Come back!)
The point is, "You don't need lockfiles."
And that much is true.
(Miss you on twitter btw. Come back!)
I think Maven's approach is functionally lock-files with worse ergonomics. You can only use the dependency from the libraries you use, but you're waiting for those libraries to update.
As an escape hatch, you end up doing a lot of exclusions and overrides, basically creating a lockfile smeared over your pom.
P.S. Sadly, I think enough people have left Twitter that it's never going to be what it was again.
As an escape hatch, you end up doing a lot of exclusions and overrides, basically creating a lockfile smeared over your pom.
P.S. Sadly, I think enough people have left Twitter that it's never going to be what it was again.
> P.S. Sadly, I think enough people have left Twitter that it's never going to be what it was again.
Majority of those people came back after a while. The alternatives get near-zero engagement, so it's just shouting into the wind. For the ones that left over political reasons, receiving near-zero engagement takes all the fun out of posting... so they're back.
Majority of those people came back after a while. The alternatives get near-zero engagement, so it's just shouting into the wind. For the ones that left over political reasons, receiving near-zero engagement takes all the fun out of posting... so they're back.
I'd be willing to bet that 95% of my "followers" on Twitter are bots. So I get near-zero engagement, or engagement that is worth zero.
it is worth it to go through and block all bot followers. your engagement will likely improve afterwards.
Of course it's functionally lock files. They do the same thing!
There's a very strong argument that manually managing deps > auto updating, regardless of the ergonomics.
P.S. You're, right, but also it's where the greatest remnant remains. :(
There's a very strong argument that manually managing deps > auto updating, regardless of the ergonomics.
P.S. You're, right, but also it's where the greatest remnant remains. :(
I fear it says something unfortunate about our entire subculture if the greatest remnant remains at the Nazi bar. :(
(To be generous: it might be that we didn't build our own bar the moment someone who is at least Nazi-tolerant started sniffing around for the opportunity to purchas the deed to the bar. The big criticism might be "we, as a subculture, aren't punk-rock enough.")
(To be generous: it might be that we didn't build our own bar the moment someone who is at least Nazi-tolerant started sniffing around for the opportunity to purchas the deed to the bar. The big criticism might be "we, as a subculture, aren't punk-rock enough.")
If Twitter is a Nazi site then why do I have to block Laura Loomer & Ben Shapiro manually?
JFC, get off Twitter. It's a Nazi propaganda site and you are going to be affected by that even if you think you're somehow immune.
You don't need package management by the same token. C is proof of that.
Having worked professionally in C, Java, Rust, Ruby, Perl, PHP I strongly prefer lock files. They make it so much nicer to manage dependencies.
Having worked professionally in C, Java, Rust, Ruby, Perl, PHP I strongly prefer lock files. They make it so much nicer to manage dependencies.
"There is another tool that does exactly the job of a lockfile, but better."
vs
"You can use make to ape the job of dependency managers"
wat?
vs
"You can use make to ape the job of dependency managers"
wat?
I have worked with Maven and dependency management is a pain. Not much nicer than vendoting dependencies like you do for C. When I first was introduced to lock files that was amazing. It solved so many problems I had with vendored dependencies, CPAN and Maven.
Just because thousands of programmers manage to suffer through your bad system every day does not make it good.
Just because thousands of programmers manage to suffer through your bad system every day does not make it good.
Now you're moving the goalposts; I think lockfiles that are checked-in to version control are superior to Maven's "Let's YOLO it if your transitive dependencies conflict." Version ranges are more expressive than single-versions, and when you add lockfiles you get deterministic builds.
I don't understand how Maven's YOLO is different from NPM's range.
If you force a transitive dependency in Maven, then yes, some other library may get incompatible with it. But in NPM when people declare dependency as, say, ~1.2.3 the also don't know if they will be compatible with a future 1.2.4 version. They just _assume_ the next patch release won't break anything. Yes npm will try to find a version that satisfies all declarations, but library devs couldn't know the new version would be compatible because it wasn't published at that time.
And my point is that it's _exactly_ the same probability that the next patch version is incompatible in both Maven and NPM. That's why NPM users are not afraid to depend on ~x.x or even ^x.x, they basically YOLOing.
If you force a transitive dependency in Maven, then yes, some other library may get incompatible with it. But in NPM when people declare dependency as, say, ~1.2.3 the also don't know if they will be compatible with a future 1.2.4 version. They just _assume_ the next patch release won't break anything. Yes npm will try to find a version that satisfies all declarations, but library devs couldn't know the new version would be compatible because it wasn't published at that time.
And my point is that it's _exactly_ the same probability that the next patch version is incompatible in both Maven and NPM. That's why NPM users are not afraid to depend on ~x.x or even ^x.x, they basically YOLOing.
Yeah, npm people expect that semantic versioning will be abided by. Obviously, it will not work if a minor version bump introduces a breaking change. Obviously this is better than pinning the same one dependency in literally every package - imagine the churn and the amount of life lost to bumping dependencies in any given ecosystem if every package had to pin a specific version of a dependency.
Ultimately, these are imperfect solutions to practical problems, and I know that I much prefer the semantic versioning and lockfile approach to whatever the java people are into.
Ultimately, these are imperfect solutions to practical problems, and I know that I much prefer the semantic versioning and lockfile approach to whatever the java people are into.
From my experience, this is a self-policing issue in the npm ecosystem. When major packages break semver, the maintainers take a ton of heat. When minor packages do it, they quickly fall out of the ecosystem entirely. It's not "YOLO"ing, but rather following the ecosystem conventions.
But anyway.. isn't that exactly the purpose of lock files? If you don't trust the semver range, it shouldn't matter because every `npm ci` results in the same package versions.
But anyway.. isn't that exactly the purpose of lock files? If you don't trust the semver range, it shouldn't matter because every `npm ci` results in the same package versions.
> I don't understand how Maven's YOLO is different from NPM's range.
The person who wrote the range selected a range that they deem likely to work.
I don't use NPM, but in Python it definitely happens that you see e.g.:
1: https://0ver.org/
The person who wrote the range selected a range that they deem likely to work.
I don't use NPM, but in Python it definitely happens that you see e.g.:
foo >= 0.3.4, <= 0.5.6
1: https://0ver.org/
[deleted]
Maven builds are deterministic (so long as you don't have SNAPSHOT dependencies). The version resolution is insane but deterministic. You'll only break that determinism if you change the dependencies.
That's precisely because maven doesn't support version ranges. Maven artifacts are also immutable.
Maven also supports manual override when the insane resolution strategy fails that's the "dependencymanagement" section.
That's precisely because maven doesn't support version ranges. Maven artifacts are also immutable.
Maven also supports manual override when the insane resolution strategy fails that's the "dependencymanagement" section.
Lockfile builds are also deterministic. You only break that determinism if you change the lockfile.
[deleted]
You can use version range with a maven plugin
https://maven.apache.org/enforcer/enforcer-rules/versionRang...
https://maven.apache.org/enforcer/enforcer-rules/versionRang...
I typically just add an <exclusion> for one of my top level dependency, so Maven picks from some other.
There is absolutely a good reason for version ranges: security updates.
When I, the owner of an application, choose a library (libuseful 2.1.1), I think it's fine that the library author uses other libraries (libinsecure 0.2.0).
But in 3 months, libinsecure is discovered (surprise!) to be insecure. So they release libinsecure 0.2.1, because they're good at semver. The libuseful library authors, meanwhile, are on vacation because it's August.
I would like to update. Turns out libinsecure's vulnerability is kind of a big deal. And with fully hardcoded dependencies, I cannot, without some horrible annoying work like forking/building/repackaging libuseful. I'd much rather libuseful depend on libinsecure 0.2.*, even if libinsecure isn't terribly good at semver.
I would love software to be deterministically built. But as long as we have security bugs, the current state is a reasonable compromise.
When I, the owner of an application, choose a library (libuseful 2.1.1), I think it's fine that the library author uses other libraries (libinsecure 0.2.0).
But in 3 months, libinsecure is discovered (surprise!) to be insecure. So they release libinsecure 0.2.1, because they're good at semver. The libuseful library authors, meanwhile, are on vacation because it's August.
I would like to update. Turns out libinsecure's vulnerability is kind of a big deal. And with fully hardcoded dependencies, I cannot, without some horrible annoying work like forking/building/repackaging libuseful. I'd much rather libuseful depend on libinsecure 0.2.*, even if libinsecure isn't terribly good at semver.
I would love software to be deterministically built. But as long as we have security bugs, the current state is a reasonable compromise.
Yeah, this felt like a gap in the article. You'd have to wait for every package to update from the bottom up before you could update you top levels to remove a risk (or you could patch in place, or override)
But what if all the packages had automatic ci/cd, and libinsecure 0.2.1 is published, libuseful automatically tests a new version of itself that uses 0.2.1, and if it succeeds it publishes a new version. And consumers of libuseful do the same, and so on.
But what if all the packages had automatic ci/cd, and libinsecure 0.2.1 is published, libuseful automatically tests a new version of itself that uses 0.2.1, and if it succeeds it publishes a new version. And consumers of libuseful do the same, and so on.
The automatic ci/cd suggestion sounds appealing, but at least in the NPM ecosystem, the depth of those dependencies would mean the top-level dependencies would constantly be incrementing. On the app developer side, it would take a lot of attention to figure when it's important to update top-level dependencies and when it's not.
Could aggregate the incrementing to for example 1 per day.
What if libinsecure 0.2.1 is the version that introduces the vulnerability, do you still want your application to pick up the update?
I think the better model is that your package manager let you do exactly what you want -- override libuseful's dependency on libinsecure when building your app.
I think the better model is that your package manager let you do exactly what you want -- override libuseful's dependency on libinsecure when building your app.
Of course there's no 0-risk version of any of this. But in my experience, bugs tend to get introduced with features, then slowly ironed out over patches and minor versions.
I want no security bugs, but as a heuristic, I'd strongly prefer the latest patch version of all libraries, even without perfect guarantees. Code rots, and most versioning schemes are designed with that in mind.
I want no security bugs, but as a heuristic, I'd strongly prefer the latest patch version of all libraries, even without perfect guarantees. Code rots, and most versioning schemes are designed with that in mind.
Except the only reason code "rots" is that the environment keeps changing as people chase the latest shiny thing. Moreover, it rots _faster_ once the assumption that everyone is going to constantly update get established, since it can be used to justify pushing non-working garbage, on the assumption "we'll fix it in an update".
This may sound judgy, but at the heart it's intended to be descriptive: there are two roughly stable states, and both have their problems.
This may sound judgy, but at the heart it's intended to be descriptive: there are two roughly stable states, and both have their problems.
Slightly off topic but we need to normalize the ability to patch external dependencies (especially transitive ones). Coming from systems like Yocto, it was mind boggling to see a company bugging the author of an open source library to release a new version to the package manager with a fix that they desperately needed.
In binary package managers this kind of workflow seems like an afterthought.
In binary package managers this kind of workflow seems like an afterthought.
nixpkgs shines especially bright in this exact scenario
Go has a deterministic package manager and handles security bugs by letting library authors retract versions [1]. The 'go get' command will print a warning if you try to retrieve a retracted version. Then you can bump the version for that module at top level.
You also have the option of ignoring it if you want to build the old version for some reason, such as testing the broken version.
[1] https://go.dev/ref/mod#go-mod-file-retract
You also have the option of ignoring it if you want to build the old version for some reason, such as testing the broken version.
[1] https://go.dev/ref/mod#go-mod-file-retract
The author hints very briefly that Semantic Version is a hint, not a guarantee, to which I agree - but then I think we should be insisting on library maintainers that semantic versioning *should* be a guarantee, and in the worst case scenario, boycott libraries that claim to be semantically versioned but don't do it in reality.
I don't understand why major.minor.patchlevel is a "hint". It had been an interface contract with shared libraries written in C when I first touched Linux, and that was 25+ years ago; way before the term "semantic version" was even invented (AFAICT).
Imagine I make a library for loading a certain format of small, trusted configuration files.
Some guy files a CVE against my library, saying it crashes if you feed it a large, untrusted file.
I decide to put out a new version of the library, fixing the CVE by refusing to load conspicuously large files. The API otherwise remains unchanged.
Is the new release a major, minor, or bugfix release? As I have only an approximate understanding of semantic versioning norms, I could go for any of them to be honest.
Some other library authors are just as confused as me, which is why major.minor.patchlevel is only a hint.
Some guy files a CVE against my library, saying it crashes if you feed it a large, untrusted file.
I decide to put out a new version of the library, fixing the CVE by refusing to load conspicuously large files. The API otherwise remains unchanged.
Is the new release a major, minor, or bugfix release? As I have only an approximate understanding of semantic versioning norms, I could go for any of them to be honest.
Some other library authors are just as confused as me, which is why major.minor.patchlevel is only a hint.
I like this example.
The client who didn't notice a difference would probably call it a bugfix.
The client whose software got ever-so-slightly more reliable probably would call it a minor update.
The client whose software previously was loading large files (luckily) without issue would call it major, because now their software just doesn't work anymore.
The client who didn't notice a difference would probably call it a bugfix.
The client whose software got ever-so-slightly more reliable probably would call it a minor update.
The client whose software previously was loading large files (luckily) without issue would call it major, because now their software just doesn't work anymore.
It's also an almost-real situation (although I wasn't the library developer involved)
You can Google "YAMLException: The incoming YAML document exceeds the limit" - an error introduced in response to CVE-2022-38752 - to see what happens when a library introduces a new input size limit.
What happened in that case is: the updated library bumps their version from 1.31 to 1.32; then a downstream application updates their dependencies, passes all tests, and updates their version from 9.3.8.0 to 9.3.9.0
You can Google "YAMLException: The incoming YAML document exceeds the limit" - an error introduced in response to CVE-2022-38752 - to see what happens when a library introduces a new input size limit.
What happened in that case is: the updated library bumps their version from 1.31 to 1.32; then a downstream application updates their dependencies, passes all tests, and updates their version from 9.3.8.0 to 9.3.9.0
> Imagine I make a library for loading a certain format of small, trusted configuration files.
> Some guy files a CVE against my library, saying it crashes if you feed it a large, untrusted file.
Not CVE-worthy, as the use case clearly falls outside of the documented / declared area of application.
> refusing to load conspicuously large files [...] Is the new release a major, minor, or bugfix release?
It deserves a major release, because it breaks compatibility. A capability that used to work (i.e,. loading a large but trusted file) no longer works. It may not affect everyone, but when assessing impact, we go for the most conservative evaluation.
> Some guy files a CVE against my library, saying it crashes if you feed it a large, untrusted file.
Not CVE-worthy, as the use case clearly falls outside of the documented / declared area of application.
> refusing to load conspicuously large files [...] Is the new release a major, minor, or bugfix release?
It deserves a major release, because it breaks compatibility. A capability that used to work (i.e,. loading a large but trusted file) no longer works. It may not affect everyone, but when assessing impact, we go for the most conservative evaluation.
It can't be a guarantee. Even the smallest patches for vulnerabilities change the behavior of the code. Most of the time this is not a problem, but weird things happen all the time. Higher memory usage, slower performance, some regressions that are only relevant for a tiny amount of users, ...
Pretty much. Everything is a breaking change to someone. Best to just ignore sem ver and have a robust automated test suite and deployment process that minimises issues with a bad build.
It’s totally fine in Maven, no need to rebuild or repackage anything. You just override version of libinsecure in your pom.xml and it uses the version you told it to
So you... manually re-lock the parts you need to?
Don't forget the part where Maven silently picks one version for you when there are transitive dependency conflicts (and no, it's not always the newest one).
Sure, I'm happy with locking the parts I need to lock. Why would I lock the parts I don't need to lock?
Because you can’t know which ones you “need” to lock.
You can definitely know this. Use
mvn dependency:tree -Dverbose
Dependency management is a deep problem with a 100 different concerns, and every time someone says "oh here it's easy, you don't need that complexity" it turns out to only apply to a tiny subset of dependency management that they thought about.
Maven/Java does absolutely insane things, it will just compile and run programs with incompatible version dependencies and then they crash at some point, and pick some arbitrary first version of a dependency it sees. Then you start shading JARs and writing regex rules to change import paths in dependencies and your program crashes with a mysterious error with 1 google result and you spend 8 hours figuring out WTF happened and doing weird surgery on your dependencies dependencies in an XML file with terrible plugins.
This proposed solution is "let's just never use version ranges and hard-code dependency versions". Now a package 5 layers deep is unmaintained and is on an ancient dependency version, other stuff needs a newer version. Now what? Manually dig through dependencies and update versions?
It doesn't even understand lockfiles fully. They don't make your build non-reproducible, they give you both reproducible builds (by not updating the lockfile) and an easy way to update dependencies if and when you want to. They were made for the express purpose of making your build reproducible.
I wish there was a mega article explaining all the concerns, tradeoffs and approaches to dependency management - there are a lot of them.
Maven/Java does absolutely insane things, it will just compile and run programs with incompatible version dependencies and then they crash at some point, and pick some arbitrary first version of a dependency it sees. Then you start shading JARs and writing regex rules to change import paths in dependencies and your program crashes with a mysterious error with 1 google result and you spend 8 hours figuring out WTF happened and doing weird surgery on your dependencies dependencies in an XML file with terrible plugins.
This proposed solution is "let's just never use version ranges and hard-code dependency versions". Now a package 5 layers deep is unmaintained and is on an ancient dependency version, other stuff needs a newer version. Now what? Manually dig through dependencies and update versions?
It doesn't even understand lockfiles fully. They don't make your build non-reproducible, they give you both reproducible builds (by not updating the lockfile) and an easy way to update dependencies if and when you want to. They were made for the express purpose of making your build reproducible.
I wish there was a mega article explaining all the concerns, tradeoffs and approaches to dependency management - there are a lot of them.
1) "it will just compile and run programs with incompatible version dependencies and then they crash at some point"
2) "Now a package 5 layers deep is unmaintained and is on an ancient dependency version, other stuff needs a newer version. Now what? Manually dig through dependencies and update versions?"
You can't solve both of these simultaneously.
If you want a library's dependences to be updated to versions other than the original library author wanted to use (e.g. because that library is unmaintained) then you're going to get those incompatibilities and crashes.
I think it's reasonable to be able to override dependencies (e.g. if something is unmaintained) but you have to accept there are going to be surprises and be prepared to solve them, which might be a bit painful, but necessary.
2) "Now a package 5 layers deep is unmaintained and is on an ancient dependency version, other stuff needs a newer version. Now what? Manually dig through dependencies and update versions?"
You can't solve both of these simultaneously.
If you want a library's dependences to be updated to versions other than the original library author wanted to use (e.g. because that library is unmaintained) then you're going to get those incompatibilities and crashes.
I think it's reasonable to be able to override dependencies (e.g. if something is unmaintained) but you have to accept there are going to be surprises and be prepared to solve them, which might be a bit painful, but necessary.
Yeah, you have to bump stuff and use packages that are actually compatible. Like Rust. Which does not do the insane things that Maven does, that the post author is presumably advocating for.
> compile and run programs with incompatible version dependencies and then they crash at some point
Just because Java does this doesn't mean every language has to. It's not strongly tied to the dependency management system used. You could have this even with a Java project using lockfiles.
> a package 5 layers deep is unmaintained and is on an ancient dependency version, other stuff needs a newer version. Now what? Manually dig through dependencies and update versions?
Alternatively, just specify the required version in the top-level project's dependency set, as suggested in the article.
Just because Java does this doesn't mean every language has to. It's not strongly tied to the dependency management system used. You could have this even with a Java project using lockfiles.
> a package 5 layers deep is unmaintained and is on an ancient dependency version, other stuff needs a newer version. Now what? Manually dig through dependencies and update versions?
Alternatively, just specify the required version in the top-level project's dependency set, as suggested in the article.
Funnily enough PHP solved this perfectly with composer, but unfortunately it's not an enterprise-level programming language /s
In case the author is reading, I can't read your article because of that animation at the bottom. I get it, it's cute, but it makes it too distracting to concentrate on the article, so I ended up just closing it.
I've never seen something so egregious before, it made it impossible to read without covering it with my hand.
But I realized something by attempting to read this article several times first.
If I ever want to write an article and reduce peoples ability to critically engage with the argument in it I should add a focus pulling animation that thwarts concerted focus.
It's like the blog equivalent of public speakers who ramble their audience into a coma.
But I realized something by attempting to read this article several times first.
If I ever want to write an article and reduce peoples ability to critically engage with the argument in it I should add a focus pulling animation that thwarts concerted focus.
It's like the blog equivalent of public speakers who ramble their audience into a coma.
> I've never seen something so egregious before
You should check how comments work on niconico.
You should check how comments work on niconico.
I think the same blog used to show you the cursor position of every other reader on your screen. Surprised that's been removed.
> I've never seen something so egregious before
Streaming comments on YouTube give it a run for its money, what absolute garbage.
Streaming comments on YouTube give it a run for its money, what absolute garbage.
Do you mean the live chat? Those are, appropriately, for live streams. They do replay afterwards as depending on the type of stream the video may not make complete sense without them (and they're easy enough to fold if they don't have any value e.g. premieres).
Thankfully that can be collapsed.
It's downright awful and I'm having a hard time imagining the author proof reading their own page and thinking "yeah, that's great".
As an aside, I have an article in my blog that has GIFs in it, and they're important for the content, but I'm not a frontend developer by any stretch of the imagination so I'm really at wit's end for how to make it so that the GIFs only play on mouse hover or something else. If anybody reading has some tips, I'd love to hear them. I'm using Zola static site generator, and all I've done is make minor HTML and CSS tweaks, so I really have no idea what I'm doing where it concerns frontend presentation.
As an aside, I have an article in my blog that has GIFs in it, and they're important for the content, but I'm not a frontend developer by any stretch of the imagination so I'm really at wit's end for how to make it so that the GIFs only play on mouse hover or something else. If anybody reading has some tips, I'd love to hear them. I'm using Zola static site generator, and all I've done is make minor HTML and CSS tweaks, so I really have no idea what I'm doing where it concerns frontend presentation.
Probably the only way to do this is to convert the gifs to an actual video, and add some js that will unpause/pause on mousein/mouseout and touchstart/touchend
Agreed, and the fact that there is not an easy "x" to close it is even worse.
If you want to do something cute and fun, whatever its your site. But if you actually want people to use your site make it easy to dismiss. We already have annoying ads and this is honestly worse than many ads.
Also, from the bio that I can barely see he writes about "UI Design" and... included this?
If you want to do something cute and fun, whatever its your site. But if you actually want people to use your site make it easy to dismiss. We already have annoying ads and this is honestly worse than many ads.
Also, from the bio that I can barely see he writes about "UI Design" and... included this?
I read the article but that animation was incredibly distracting. I don't even understand what it's for - clicking it does nothing. Best guess is a representation of how many people active on page.
I'll also add that the "night mode" is obnoxious as hell anyway.
Inverted colours would've been _mostly fine._ Not great, but mostly fine, but instead, the author went out of their way to add this flashlight thing that's borderline unusable?
What the hell is this website?
Inverted colours would've been _mostly fine._ Not great, but mostly fine, but instead, the author went out of their way to add this flashlight thing that's borderline unusable?
What the hell is this website?
I'm sure this feature is a joke, not intended to be usable. It's a personal blog.
As someone who does like tonsky’s stuff sometimes: I immediately closed the article when I saw it. I’m less charitable than you: it’s not cute, it’s just annoying, and it should be able to be switched off. For me it goes into the same box as his “dark mode” setting but it’s worse because it can’t be disabled. Why should I, as the reader, put in effort to overcome something the author found “cute” just to read their words? It’s akin to aligning the words to the right, or vertically: I can read it but it’s so much work that I’d rather just not.
On sites like that, I typically just switch to "reader view" which the leaves only the interesting content.
The animation? For me it was the blinding yellow background
It also covers a whole 1/4 of the screen on mobile...
It covers 90% of the screen on iPad
Reader mode. Don't leave home without it.
Even worse, it exposes the city all viewers within the HTML, even if the country code is only displayed on the webpage.
Obviously, the server gets your IP when you connect but ideally it doesn't share that with all visitors. This isn't as bad as that, still concerning.
Obviously, the server gets your IP when you connect but ideally it doesn't share that with all visitors. This isn't as bad as that, still concerning.
Every time something from this website is shared, this topic comes up. It's one of those things where you can't tell whether it's genius or madness. Either way, I'm pretty sure the design is deliberate(ly obnoxious).
12 years later, https://alisdair.mcdiarmid.org/kill-sticky-headers/ is still super useful.
Wow, that's one of the most abhorrent web designs I've ever seen
Yes is horrible, this idea.
I wonder if it respects prefers-reduced-motion, though I don't know if I have that set in my browser, I do have it set with my OS.
My favorite websites are the weird ones that make people complain about stuff.
To all people in this sub thread: suggestion to try reader mode.
In addition, the solid yellow background is another readability impediment.
Same here, I also closed it within a few seconds.
Thanos snap it if you’re using ios
When I saw the yellow background, I knew this is the website where I read the Unicode article [1]. Sure it is. With great pain I finished it.
I mean, just the fact that the background is yellow is a terrible UX decision. Not to mention that ridiculous "dark mode". No, it's not funny. It's stupid and distracting.
[1] https://tonsky.me/blog/unicode/
I mean, just the fact that the background is yellow is a terrible UX decision. Not to mention that ridiculous "dark mode". No, it's not funny. It's stupid and distracting.
[1] https://tonsky.me/blog/unicode/
Let the web have a bit of personality. It's ok if you don't like this particular website, plenty of other places to be.
In ublock origin
tonsky.me##.container
tonsky.me##.container
Let's play this out in a compiled language like Cargo.
If every dependency was a `=` and cargo allowed multiple versions of SemVer compatible packages.
The first impact will be that your build will fail. Say you are using `regex` and you are interacting with two libraries that take a `regex::Regex`. All of the versions need to align to pass `Regex` between yourself and your dependencies.
The second impact will be that your builds will be slow. People are already annoyed when there are multiple SemVer incompatible versions of their dependencies in their dependency tree, now it can happen to any of your dependencies and you are working across your dependency tree to get everything aligned.
The third impact is if you, as the application developer, need a security fix in a transitive dependency. You now need to work through the entire bubble up process before it becomes available to you.
Ultimately, lockfiles are about giving the top-level application control over their dependency tree balanced with build times and cross-package interoperability. Similarly, SemVer is a tool any library with transitive dependencies [0]
[0] https://matklad.github.io/2024/11/23/semver-is-not-about-you...
If every dependency was a `=` and cargo allowed multiple versions of SemVer compatible packages.
The first impact will be that your build will fail. Say you are using `regex` and you are interacting with two libraries that take a `regex::Regex`. All of the versions need to align to pass `Regex` between yourself and your dependencies.
The second impact will be that your builds will be slow. People are already annoyed when there are multiple SemVer incompatible versions of their dependencies in their dependency tree, now it can happen to any of your dependencies and you are working across your dependency tree to get everything aligned.
The third impact is if you, as the application developer, need a security fix in a transitive dependency. You now need to work through the entire bubble up process before it becomes available to you.
Ultimately, lockfiles are about giving the top-level application control over their dependency tree balanced with build times and cross-package interoperability. Similarly, SemVer is a tool any library with transitive dependencies [0]
[0] https://matklad.github.io/2024/11/23/semver-is-not-about-you...
This scheme _can_ be made to work in the context of Cargo. You can have all of:
* Absence of lockfiles
* Absence of the central registry
* Cryptographically checksummed dependency trees
* Semver-style unification of compatible dependencies
* Ability for the root package to override transitive dependencies
At the cost of
* minver-ish resolution semantics
* deeper critical path in terms of HTTP requests for resolving dependencies
The trick is that, rather than using crates.io as the universe of package versions to resolve against, you look only at the subset of package versions reachable from the root package. See https://matklad.github.io/2024/12/24/minimal-version-selecti...
* Absence of lockfiles
* Absence of the central registry
* Cryptographically checksummed dependency trees
* Semver-style unification of compatible dependencies
* Ability for the root package to override transitive dependencies
At the cost of
* minver-ish resolution semantics
* deeper critical path in terms of HTTP requests for resolving dependencies
The trick is that, rather than using crates.io as the universe of package versions to resolve against, you look only at the subset of package versions reachable from the root package. See https://matklad.github.io/2024/12/24/minimal-version-selecti...
Note that the original article came across as there being no package unification. A later update said that versions would be selected "closest to the root".
I was speaking to that version of the article. There was no way to override transitive dependencies and no unification. When those are in the picture, the situation changes. However, that also undermines an argument of the article against SemVer
> But... why would libpupa’s author write a version range that includes versions that don’t exist yet? How could they know that liblupa 0.7.9, whenever it will be released, will continue to work with libpupa? Surely they can’t see the future? Semantic versioning is a hint, but it has never been a guarantee.
I was speaking to that version of the article. There was no way to override transitive dependencies and no unification. When those are in the picture, the situation changes. However, that also undermines an argument of the article against SemVer
> But... why would libpupa’s author write a version range that includes versions that don’t exist yet? How could they know that liblupa 0.7.9, whenever it will be released, will continue to work with libpupa? Surely they can’t see the future? Semantic versioning is a hint, but it has never been a guarantee.
Is that what Go does? I always thought their module versioning system sounded well thought out (though I gave up on Go before they introduced it so I have no idea how well it works in practice).
> All of the versions need to align to pass `Regex` between yourself and your dependencies.
In nominally typed languages, all types have to be nominally the same, yes, but it does not follow that semver compatible packages will not permit passing different versions of each around: https://github.com/dtolnay/semver-trick (the trick is to ensure that different versions have nominally the same type by forward dependency).
Anyways, even with this, cargo has a lock file because you want to run in CI what you ran when you developed the feature instead of getting non-deterministic executions in an automated build + verification. That's what a deterministic build is aiming for. Then next feature you develop you can ignore the lockfile, pull in the new dependencies and move on with life because you don't necessarily care for determinism there: you are willing to fix issues. Or you aren't and you use the lockfile.
In nominally typed languages, all types have to be nominally the same, yes, but it does not follow that semver compatible packages will not permit passing different versions of each around: https://github.com/dtolnay/semver-trick (the trick is to ensure that different versions have nominally the same type by forward dependency).
Anyways, even with this, cargo has a lock file because you want to run in CI what you ran when you developed the feature instead of getting non-deterministic executions in an automated build + verification. That's what a deterministic build is aiming for. Then next feature you develop you can ignore the lockfile, pull in the new dependencies and move on with life because you don't necessarily care for determinism there: you are willing to fix issues. Or you aren't and you use the lockfile.
> All of the versions need to align to pass `Regex` between yourself and your dependencies.
No, they don't. As the article explains, the resolution process will pick the version that is 'closest to the root' of the project.
> The second impact will be that your builds will be slow....you are working across your dependency tree to get everything aligned.
As mentioned earlier, no you're not. So there's nothing to support the claim that builds will be slower.
> You now need to work through the entire bubble up process before it becomes available to you.
No you don't, because as mentioned earlier, the version that is 'closest to root' will be picked. So you just specify the security fixed version as a direct dependency and you get it immediately.
No, they don't. As the article explains, the resolution process will pick the version that is 'closest to the root' of the project.
> The second impact will be that your builds will be slow....you are working across your dependency tree to get everything aligned.
As mentioned earlier, no you're not. So there's nothing to support the claim that builds will be slower.
> You now need to work through the entire bubble up process before it becomes available to you.
No you don't, because as mentioned earlier, the version that is 'closest to root' will be picked. So you just specify the security fixed version as a direct dependency and you get it immediately.
You should not be editing your cargo.lock file manually. Cargo gives you a first-class way of overriding transitive dependencies.
You can also do cargo update -p
Go MVS ought to be deterministic, but it still benefits from modules having lockfiles as it allows one to guarantee that the resolution of modules is consistent without needing to trust a central authority.
Go's system may be worth emulating in future designs. It's not perfect (still requires some centralized elements, module identities for versions ≥2 are confusing, etc.) but it does present a way to both not depend strongly on specific centralized authorities without also making any random VCS server on the Internet a potential SPoF for compiling software. On the other hand, it only really works well for module systems that purely deal with source code and not binary artifacts, and it also is going to be the least hazardous when fetching and compiling modules is defined to not allow arbitrary code execution. Those constraints together make this system pretty much uniquely suited to Go for now, which is a bit of a shame, because it has some cool knock-on effects.
(Regarding deterministic MVS resolution: imagine [email protected] depending on [email protected], and [email protected] depending on [email protected]. What if [email protected] no longer depends on b? You can construct trickier versions of this possibly using loops, but the basic idea is that it might be tricky to give a stable resolution to version constraints when the set of constraints that are applied depends on the set of constraints that are applied. There are possible deterministic ways to resolve this of course, it's just that a lot of these edge cases are pretty hard to reason about and I think Go MVS had a lot of bugs early on.)
Go's system may be worth emulating in future designs. It's not perfect (still requires some centralized elements, module identities for versions ≥2 are confusing, etc.) but it does present a way to both not depend strongly on specific centralized authorities without also making any random VCS server on the Internet a potential SPoF for compiling software. On the other hand, it only really works well for module systems that purely deal with source code and not binary artifacts, and it also is going to be the least hazardous when fetching and compiling modules is defined to not allow arbitrary code execution. Those constraints together make this system pretty much uniquely suited to Go for now, which is a bit of a shame, because it has some cool knock-on effects.
(Regarding deterministic MVS resolution: imagine [email protected] depending on [email protected], and [email protected] depending on [email protected]. What if [email protected] no longer depends on b? You can construct trickier versions of this possibly using loops, but the basic idea is that it might be tricky to give a stable resolution to version constraints when the set of constraints that are applied depends on the set of constraints that are applied. There are possible deterministic ways to resolve this of course, it's just that a lot of these edge cases are pretty hard to reason about and I think Go MVS had a lot of bugs early on.)
I don't think anything about Go requires a central authority. You only need access to the sources of all your dependencies.
Go by default uses proxy.golang.org for speed/security, and sum.golang.org for sharing verification, but it works just fine without them.
I think trust in binary packages / no remote code execution is orthogonal to dependency selection.
Go by default uses proxy.golang.org for speed/security, and sum.golang.org for sharing verification, but it works just fine without them.
I think trust in binary packages / no remote code execution is orthogonal to dependency selection.
Consider a project like Kubernetes. Find a dependency whose domain name has lapsed, or might soon. Snipe it, replicate the original VCS, add a new malicious version under a new tag. Wait for someone to go get -u it.
This is pretty bad even today: If it goes unnoticed, it could lead to compromised binaries being released. However, it underscores design decisions related to the module system that helps to reduce the impact:
- Use of MVS means that even without a sum file, you still won't automatically download malware published in new versions.
- Use of a centralized proxy and sumdb by most of the ecosystem greatly reduces the likelihood that an attacker will attempt to change an existing version as it likely won't work and might result in detection instead.
- Lack of code execution in dependency fetching substantially reduces the odds of being able to compromise a developer machine. It doesn't make the problem a non-issue, but the prognosis is a ton better.
In NPM, if you don't have a lockfile, the version constraints will be resolved as you install dependencies. These version constraints are not necessarily deterministic, and installation can execute arbitrary code as the user. This is a pretty bad combination but there is a bit of relief because at least malware can be pulled from NPM when it is discovered... Which doesn't solve everything, but it's a lot better than nothing.
Anyway, that's why I don't consider these topics to be fully orthogonal. They do have some interplay.
This is pretty bad even today: If it goes unnoticed, it could lead to compromised binaries being released. However, it underscores design decisions related to the module system that helps to reduce the impact:
- Use of MVS means that even without a sum file, you still won't automatically download malware published in new versions.
- Use of a centralized proxy and sumdb by most of the ecosystem greatly reduces the likelihood that an attacker will attempt to change an existing version as it likely won't work and might result in detection instead.
- Lack of code execution in dependency fetching substantially reduces the odds of being able to compromise a developer machine. It doesn't make the problem a non-issue, but the prognosis is a ton better.
In NPM, if you don't have a lockfile, the version constraints will be resolved as you install dependencies. These version constraints are not necessarily deterministic, and installation can execute arbitrary code as the user. This is a pretty bad combination but there is a bit of relief because at least malware can be pulled from NPM when it is discovered... Which doesn't solve everything, but it's a lot better than nothing.
Anyway, that's why I don't consider these topics to be fully orthogonal. They do have some interplay.
For what it's worth I think Go's MVS somewhat meets the desire here. It does not require lockfiles, but also doesn't allow use of multiple different minor/patch versions of a library: https://research.swtch.com/vgo-mvs
I believe Zig is also considering adopting it.
If there are any dependencies with the same major version the algorithm simply picks the newest one of them all (but not the newest in the package registry), so you don't need a lockfile to track version decisions.
Go's go.sum contains checksums to validate content, but is not required for version selection decisions.
I believe Zig is also considering adopting it.
If there are any dependencies with the same major version the algorithm simply picks the newest one of them all (but not the newest in the package registry), so you don't need a lockfile to track version decisions.
Go's go.sum contains checksums to validate content, but is not required for version selection decisions.
Strongly endorse. That paper is really wonderful. It seems to me that MVS is the solution to the version selection problem, and now we just have to wait for awareness of this to fully percolate through the developer community.
Indirect require section in go.mod file is essentially a lockfile. Once decision is made by tool, it's codified for future builds.
The //indirect dependencies I believe are just there to track dependencies that are not in the project, or to help with caching: https://github.com/golang/go/issues/36460
In go 1.17 they were added so that project loading did not require downloading the go.mod of every dependency in the graph.
In go 1.17 they were added so that project loading did not require downloading the go.mod of every dependency in the graph.
The decision process is deterministic and requires no human input, it's only there for caching / speed, so it's not like a traditional lockfile.
You can delete the indirect section and it will be reconstructed exactly as before.
What if your program depends on library a1.0 and library b1.0, and library a1.0 depends on c2.1 and library b1.0 depends on c2.3? Which one do you install in your executable? Choosing one randomly might break the other library. Installing both _might_ work, unless you need to pass a struct defined in library c from a1.0 to b1.0, in which case a1.0 and b1.0 may expect different memory layouts (even if the public interface for the struct is the exact same between versions).
The reason we have dependency ranges and lockfiles is so that library a1.0 can declare "I need >2.1" and b1.0 can declare "I need >2.3" and when you depend on a1.0 and b1.0, we can do dependency resolution and lock in c2.3 as the dependency for the binary.
The reason we have dependency ranges and lockfiles is so that library a1.0 can declare "I need >2.1" and b1.0 can declare "I need >2.3" and when you depend on a1.0 and b1.0, we can do dependency resolution and lock in c2.3 as the dependency for the binary.
One of the versions will be picked up. If that version doesn’t work, you can try another one. The process is exactly the same
> If that version doesn’t work, you can try another one.
And how will this look like, if your app doesn't have library C mentioned in its dependencies, only libraries A and B? You are prohibited from answering "well, just specify all the transitive dependencies manually" because it's precisely what a lockfile is/does.
And how will this look like, if your app doesn't have library C mentioned in its dependencies, only libraries A and B? You are prohibited from answering "well, just specify all the transitive dependencies manually" because it's precisely what a lockfile is/does.
Maven's version resolution mechanism determines which version of a dependency to use when multiple versions are specified in a project's dependency tree. Here's how it works:
- Nearest Definition Wins: When multiple versions of the same dependency appear in the dependency tree, the version closest to your project in the tree will be used.
- First Declaration Wins: If two versions of the same dependency are at the same depth in the tree, the first one declared in the POM will be used.
- Nearest Definition Wins: When multiple versions of the same dependency appear in the dependency tree, the version closest to your project in the tree will be used.
- First Declaration Wins: If two versions of the same dependency are at the same depth in the tree, the first one declared in the POM will be used.
It's not "all the transitive dependencies". It's only the transitive dependencies you need to explicitly specify a version for because the one that was specified by your direct dependency is not appropriate for X reason.
Alternative answer: both versions will be picked up.
It's not always the correct solution, but sometimes it is. If I have a dependency that uses libUtil 2.0 and another that uses libUtil 3.0 but neither exposes types from libUtil externally, or I don't use functions that expose libUtil types, I shouldn't have to care about the conflict.
It's not always the correct solution, but sometimes it is. If I have a dependency that uses libUtil 2.0 and another that uses libUtil 3.0 but neither exposes types from libUtil externally, or I don't use functions that expose libUtil types, I shouldn't have to care about the conflict.
This points to a software best-practice: "Don't leak types from your dependencies." If your package depends on A, never emit one of A's structs.
Good luck finding a project of any complexity that manages to adhere to that kind of design sensibility religiously.
(I think the only language I've ever used that provided top-level support for recognizing that complexity was SML/NJ, and it's been so long that I don't remember exactly how it was done... Modules could take parameters so at the top level you could pass to each module what submodule it would be using, and only then could the module emit types originating from the submodule because the passing-in "app code" had visibility on the submodule to comprehend those types. It was... Exactly as un-ergonomic as you think. A real nightmare. "Turn your brain around backwards" kind of software architecting.)
Good luck finding a project of any complexity that manages to adhere to that kind of design sensibility religiously.
(I think the only language I've ever used that provided top-level support for recognizing that complexity was SML/NJ, and it's been so long that I don't remember exactly how it was done... Modules could take parameters so at the top level you could pass to each module what submodule it would be using, and only then could the module emit types originating from the submodule because the passing-in "app code" had visibility on the submodule to comprehend those types. It was... Exactly as un-ergonomic as you think. A real nightmare. "Turn your brain around backwards" kind of software architecting.)
I can think of plenty situations where you really want to use the dependency's types though. For instance the dependency provides some sort of data structure and you have one library that produces said data structure and a separate library that consumes it.
What you're describing with SML functors is essentially dependency injection I think; it's a good thing to have in the toolbox but not a universal solution either. (I do like functors for dependency injection, much more than the inscrutable goo it tends to be in OOP languages anyways)
What you're describing with SML functors is essentially dependency injection I think; it's a good thing to have in the toolbox but not a universal solution either. (I do like functors for dependency injection, much more than the inscrutable goo it tends to be in OOP languages anyways)
I can think of those situations too, and in practice this is done all the time (by everyone I know, including me).
In theory... None of us should be doing it. Emitting raw underlying structures from a dependency coupled with ranged versioning means part of your API is under-specified; "And this function returns an argument, the type of which is whatever this third-party that we don't directly communicate with says the type is." That's hard to code against in the general case (but it works out often enough in the specific case that I think it's safe to do 95-ish percent of the time).
In theory... None of us should be doing it. Emitting raw underlying structures from a dependency coupled with ranged versioning means part of your API is under-specified; "And this function returns an argument, the type of which is whatever this third-party that we don't directly communicate with says the type is." That's hard to code against in the general case (but it works out often enough in the specific case that I think it's safe to do 95-ish percent of the time).
It works just fine in C land because modifying a struct in any way is an ABI breaking change, so in practice any struct type that is exported has to be automatically deemed frozen (except for major version upgrades where compat is explicitly not a goal).
Alternatively, it's a pointer to an opaque data structure. But then that fact (that it's a pointer) is frozen.
Either way, you can rely on dependencies not just pulling the rug from under you.
Alternatively, it's a pointer to an opaque data structure. But then that fact (that it's a pointer) is frozen.
Either way, you can rely on dependencies not just pulling the rug from under you.
I like this answer. "It works just fine in C land because this is a completely impossible story in C land."
(I remember, ages ago, trying to wrap my head around Component Object Model. It took me awhile to grasp it in the abstract because, I finally realized, it was trying to solve a problem I'd never needed to solve before: ABI compatibility across closed-source binaries with different compilation architectures).
(I remember, ages ago, trying to wrap my head around Component Object Model. It took me awhile to grasp it in the abstract because, I finally realized, it was trying to solve a problem I'd never needed to solve before: ABI compatibility across closed-source binaries with different compilation architectures).
So you need to test if the version worked yourself (e.g. via automated tests)? Seems better to have the library author do this for you and define a range.
No, no, a thousand times no.
The package file (whatever your system) is communication to other humans about what you know about the versions you need.
The lockfile is the communication to other computers about the versions you are using.
What you shouldn't have needed is fully defined versions in your package files (but you do need it, in case some package or another doesn't do a good enough job following semver)
So, this:
The package file (whatever your system) is communication to other humans about what you know about the versions you need.
The lockfile is the communication to other computers about the versions you are using.
What you shouldn't have needed is fully defined versions in your package files (but you do need it, in case some package or another doesn't do a good enough job following semver)
So, this:
package1: latest
# We're stuck on an old version b/c of X, Y, Z
package2: ~1.2
With deterministic version control, library authors are supposed to document the exact version that a library was tested with. (Or the oldest version that they tested with and still works.)
People who use a library might use newer versions (via diamond dependencies or because they use latest), but it will result in a combination of dependencies that wasn't tested by the library's authors. Often that's okay because libraries try to maintain backward compatibility.
Old libraries that haven't had a new release in a while are going to specify older dependencies and you just have to deal with that. The authors aren't expected to guess which future versions will work. They don't know about security bugs or broken versions of dependencies that haven't been released yet. There are other mechanisms for communicating about that.
People who use a library might use newer versions (via diamond dependencies or because they use latest), but it will result in a combination of dependencies that wasn't tested by the library's authors. Often that's okay because libraries try to maintain backward compatibility.
Old libraries that haven't had a new release in a while are going to specify older dependencies and you just have to deal with that. The authors aren't expected to guess which future versions will work. They don't know about security bugs or broken versions of dependencies that haven't been released yet. There are other mechanisms for communicating about that.
I see lockfiles as something you use for applications you are deploying - if you run something like a web app it's very useful to know exactly what is being deployed to production, make sure it exactly matches staging and development environments, make sure you can audit new upgrades to your dependencies etc.
This article appears to be talking about lockfiles for libraries - and I agree, for libraries you shouldn't be locking exact versions because it will inevitably pay havoc with other dependencies.
Or maybe I'm missing something about the JavaScript ecosystem here? I mainly understand Python.
This article appears to be talking about lockfiles for libraries - and I agree, for libraries you shouldn't be locking exact versions because it will inevitably pay havoc with other dependencies.
Or maybe I'm missing something about the JavaScript ecosystem here? I mainly understand Python.
The lockfile only applies when you run `npm install` in the project directory, other projects using your package will have their own lockfile and resolve your dependencies using only your package.json.
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I think you missed the point of the article. Consider Application A, that depends on Library L1. Library L1 in turn depends on Library L2:
A -> L1 -> L2
They are saying that A should not need a lockfile because it should specify a single version of L1 in its dependencies (i.e. using an == version check in Python), which in turn should specify a single version of L2 (again with an == version check).
Obviously if everybody did this, then we wouldn't need lockfiles (which is what TFA says). The main downsides (which many comments here point out) are:
1. Transitive dependency conflicts would abound
2. Security updates are no longer in the hands of the app developers (in my above example, the developer of A1 is dependent on the developer of L1 whenever a security bug happens in L2).
3. When you update a direct dependency, your transitive dependencies may all change, making what you that was a small change into a big change.
(FWIW, I put these in order of importance to me; I find #3 to be a nothingburger, since I've hardly ever updated a direct dependency without it increasing the minimum dependency of at least one of its dependencies).
A -> L1 -> L2
They are saying that A should not need a lockfile because it should specify a single version of L1 in its dependencies (i.e. using an == version check in Python), which in turn should specify a single version of L2 (again with an == version check).
Obviously if everybody did this, then we wouldn't need lockfiles (which is what TFA says). The main downsides (which many comments here point out) are:
1. Transitive dependency conflicts would abound
2. Security updates are no longer in the hands of the app developers (in my above example, the developer of A1 is dependent on the developer of L1 whenever a security bug happens in L2).
3. When you update a direct dependency, your transitive dependencies may all change, making what you that was a small change into a big change.
(FWIW, I put these in order of importance to me; I find #3 to be a nothingburger, since I've hardly ever updated a direct dependency without it increasing the minimum dependency of at least one of its dependencies).
> Transitive dependency conflicts would abound
They would be resolved by just picking the version 'closest to root', as explained in the article.
> Security updates are no longer in the hands of the app developers
It is, the app developers can just put in a direct dependency on the fixed version of L2. As mentioned earlier, this is the version that will be resolved for the project.
> When you update a direct dependency, your transitive dependencies may all change, making what you that was a small change into a big change.
This is the same even if you use a lockfile system. When you update dependencies you are explicitly updating the lockfile as well, so a bunch of transitive dependencies can change.
They would be resolved by just picking the version 'closest to root', as explained in the article.
> Security updates are no longer in the hands of the app developers
It is, the app developers can just put in a direct dependency on the fixed version of L2. As mentioned earlier, this is the version that will be resolved for the project.
> When you update a direct dependency, your transitive dependencies may all change, making what you that was a small change into a big change.
This is the same even if you use a lockfile system. When you update dependencies you are explicitly updating the lockfile as well, so a bunch of transitive dependencies can change.
> They would be resolved by just picking the version 'closest to root', as explained in the article.
Which is going to lead to horrible issues when that library isn't compatible with all your other dependencies. What if your app directly depends on both L1 and L2, but L1 is compatible with L3 1.2 ... 1.5 while L2 is compatible with L3 1.4 ... 1.7? A general "stick to latest" policy would have L1: "L3==1.5", L2: "L3==1.7" (which breaks L1 if L2 wins). A general "stick to oldest compatible" policy would have L1: "L3==1.2", L2: "L3==1.4" (which breaks L2 if L1 wins).
The obvious solution would be to use L3 1.4 ... 1.5 - but that will never happen without the app developer manually inspecting the transitive dependencies and hardcoding the solution - in essence reinventing the lock file.
> It is, the app developers can just put in a direct dependency on the fixed version of L2. As mentioned earlier, this is the version that will be resolved for the project.
And how is that going to work out in practice? Is that direct dependency supposed to sit in your root-level spec file forever? Will there be a special section for all the "I don't really care about this, but we need to manually override it for now" dependencies? Are you going to have to manually specify and bump it until the end of time because you are at risk of your tooling pulling in the vulnerable version? Is there going to be tooling which automatically inspects your dependencies and tells you when it is safe to drop?
> This is the same even if you use a lockfile system. When you update dependencies you are explicitly updating the lockfile as well, so a bunch of transitive dependencies can change.
The difference is that in the lockfile world any changes to transitive dependencies are well-reasoned. If every package specifies a compatibility range for its dependencies, the dependency management system can be reasonably sure that any successful resolution will not lead to issues and that you are getting the newest package versions possible.
With a "closest-to-root" approach, all bets are off. A seemingly-trivial change in your direct dependencies can lead to a transitive dependency completely breaking your entire application, or to a horribly outdated library getting pulled in. Moreover, you might not even be aware that this is happening. After all, if you were keeping track of the specific versions of every single transitive dependency, you'd essentially be storing a lockfile - and that's what you were trying to avoid...
Which is going to lead to horrible issues when that library isn't compatible with all your other dependencies. What if your app directly depends on both L1 and L2, but L1 is compatible with L3 1.2 ... 1.5 while L2 is compatible with L3 1.4 ... 1.7? A general "stick to latest" policy would have L1: "L3==1.5", L2: "L3==1.7" (which breaks L1 if L2 wins). A general "stick to oldest compatible" policy would have L1: "L3==1.2", L2: "L3==1.4" (which breaks L2 if L1 wins).
The obvious solution would be to use L3 1.4 ... 1.5 - but that will never happen without the app developer manually inspecting the transitive dependencies and hardcoding the solution - in essence reinventing the lock file.
> It is, the app developers can just put in a direct dependency on the fixed version of L2. As mentioned earlier, this is the version that will be resolved for the project.
And how is that going to work out in practice? Is that direct dependency supposed to sit in your root-level spec file forever? Will there be a special section for all the "I don't really care about this, but we need to manually override it for now" dependencies? Are you going to have to manually specify and bump it until the end of time because you are at risk of your tooling pulling in the vulnerable version? Is there going to be tooling which automatically inspects your dependencies and tells you when it is safe to drop?
> This is the same even if you use a lockfile system. When you update dependencies you are explicitly updating the lockfile as well, so a bunch of transitive dependencies can change.
The difference is that in the lockfile world any changes to transitive dependencies are well-reasoned. If every package specifies a compatibility range for its dependencies, the dependency management system can be reasonably sure that any successful resolution will not lead to issues and that you are getting the newest package versions possible.
With a "closest-to-root" approach, all bets are off. A seemingly-trivial change in your direct dependencies can lead to a transitive dependency completely breaking your entire application, or to a horribly outdated library getting pulled in. Moreover, you might not even be aware that this is happening. After all, if you were keeping track of the specific versions of every single transitive dependency, you'd essentially be storing a lockfile - and that's what you were trying to avoid...
Is the article also suggesting that if there are version conflicts, it goes with the top level library? For example, if we want to use a secure version of L2, it would be specified at A, ignoring the version specified by L1?
Or maybe I misread the article and it did not say that.
Or maybe I misread the article and it did not say that.
It's maybe implied since Maven lets you do that (actually it uses the shallowest dependency, with the one listed first winning ties), but the thrust of the article seems to be roughly: "OMGWTFBBQ we can't use L2 with 0.7.9 if L1 was only tested with 0.7.9!" so I don't know how the author feels about that.
[edit]
The author confirmed that they are assuming Maven's rules and added it to the bottom of their post.
[edit]
The author confirmed that they are assuming Maven's rules and added it to the bottom of their post.
Ok, but what happens when lib-a depends on lib-x:0.1.4 and lib-b depends on lib-x:0.1.5, even though it could have worked with any lib-x:0.1.*? Are these libraries just incompatible now? Lockfiles don't guarantee that new versions are compatible, but it guarantees that if your code works in development, it will work in production (at least in terms of dependencies).
I assume java gets around this by bundling libraries into the deployed .jar file. That this is better than a lock file, but doesn't make sense for scripting languages that don't have a build stage. (You won't have trouble convincing me that every language should have a proper build stage, but you might have trouble convincing the millions of lines of code already written in languages that don't.)
I assume java gets around this by bundling libraries into the deployed .jar file. That this is better than a lock file, but doesn't make sense for scripting languages that don't have a build stage. (You won't have trouble convincing me that every language should have a proper build stage, but you might have trouble convincing the millions of lines of code already written in languages that don't.)
> Are these libraries just incompatible now?
Python says "Yes." Every environment manager I've seen, if your version ranges don't overlap for all your dependencies, will end up failing to populate the environment. Known issue; some people's big Python apps just break sometimes and then three or four open source projects have to talk to each other to un-fsck the world.
npm says "No" but in a hilarious way: if lib-a emits objects from lib-x, and lib-b emits objects from lib-x, you'll end up with objects that all your debugging tools will tell you should be the same type, and TypeScript will statically tell you are the same type, but don't `instanceof` the way you'd expect two objects that are the same type should. Conclusion: `instanceof` is sus in a large program; embrace the duck typing (and accept that maybe your a-originated lib-x objects can't be passed to b-functions without explosions because I bet b didn't embrace the duck-typing).
Python says "Yes." Every environment manager I've seen, if your version ranges don't overlap for all your dependencies, will end up failing to populate the environment. Known issue; some people's big Python apps just break sometimes and then three or four open source projects have to talk to each other to un-fsck the world.
npm says "No" but in a hilarious way: if lib-a emits objects from lib-x, and lib-b emits objects from lib-x, you'll end up with objects that all your debugging tools will tell you should be the same type, and TypeScript will statically tell you are the same type, but don't `instanceof` the way you'd expect two objects that are the same type should. Conclusion: `instanceof` is sus in a large program; embrace the duck typing (and accept that maybe your a-originated lib-x objects can't be passed to b-functions without explosions because I bet b didn't embrace the duck-typing).
> I assume java gets around this by bundling libraries into the deployed .jar file. That this is better than a lock file, but doesn't make sense for scripting languages that don't have a build stage. (You won't have trouble convincing me that every language should have a proper build stage, but you might have trouble convincing the millions of lines of code already written in languages that don't.)
You are wrong; Maven just picks one of lib-x:0.1.4 or lib-x:0.1.5 depending on the ordering of the dependency tree.
You are wrong; Maven just picks one of lib-x:0.1.4 or lib-x:0.1.5 depending on the ordering of the dependency tree.
Maven will also silently choose different minor and major versions, destroying your application. Sometimes at compile time, sometimes at runtime.
Java dependency management is unhinged, antiquated garbage to anyone who has used any other ecosystem.
Java dependency management is unhinged, antiquated garbage to anyone who has used any other ecosystem.
Maven is not Java, though.
Gradle suffers the same exact issue by default, because it inherits it from Maven (they use the same repository). You need to go out of your way to enable strict versioning policies and lock files.
Maven and Gradle make up the vast majority of all Java projects in the wild today. So, effectively, Maven is Java in terms of dependency management.
Maven and Gradle make up the vast majority of all Java projects in the wild today. So, effectively, Maven is Java in terms of dependency management.
> Gradle suffers the same exact issue by default, because it inherits it from Maven
It's not the exact same issue because Gradle and Maven have different conflict resolution:
Maven dependency conflict resolution works with a shortest path, which is impacted by declaration ordering. Gradle does full conflict resolution, selecting the highest version of a dependency found in the graph.
from https://gradle.org/maven-and-gradle/
It's not the exact same issue because Gradle and Maven have different conflict resolution:
Maven dependency conflict resolution works with a shortest path, which is impacted by declaration ordering. Gradle does full conflict resolution, selecting the highest version of a dependency found in the graph.
from https://gradle.org/maven-and-gradle/
How do you change the order?
You go into your pom.xml file (bunch of <dependency>) using a text editor and change the order.
Most of the issues in this thread and the article, are, IMO, problems with Node, not with lockfiles.
>How could they know that liblupa 0.7.9, whenever it will be released, will continue to work with libpupa? Surely they can’t see the future? Semantic versioning is a hint, but it has never been a guarantee.
Yes, this is a social contract. Not everything in the universe can be locked into code, and with Semantic versioning, we hope that our fellow humans won't unnecessarily break packages in non-major releases. It happens, and people usually apologize and fix, but it's rare.
This has worked successfully if you look at RubyGems which is 6 years older than npm (although Gemfile.lock was introduced in 2010, npm didn't introduce it until 2017).
RubyGems doesn't have the same reputation for dysfunction as Node does. Neither does Rust, Go, PHP, and Haskell. Even more that I probably don't use a daily basis. Node is the only language that I will come back and find a docker container that straight up won't build or a package that requires the entire dependency tree to update because one package pushed a minor-version change that ended up requiring a minor version change to Node, then that new version of Node isn't compatible with some hack that another package did in it's C extension.
In fact, I expect some Node developer to read this article and deploy yet another tool that will break _everything_ in the build process. In other languages I don't even think I've ever really thought about dependency resolution in years.
>How could they know that liblupa 0.7.9, whenever it will be released, will continue to work with libpupa? Surely they can’t see the future? Semantic versioning is a hint, but it has never been a guarantee.
Yes, this is a social contract. Not everything in the universe can be locked into code, and with Semantic versioning, we hope that our fellow humans won't unnecessarily break packages in non-major releases. It happens, and people usually apologize and fix, but it's rare.
This has worked successfully if you look at RubyGems which is 6 years older than npm (although Gemfile.lock was introduced in 2010, npm didn't introduce it until 2017).
RubyGems doesn't have the same reputation for dysfunction as Node does. Neither does Rust, Go, PHP, and Haskell. Even more that I probably don't use a daily basis. Node is the only language that I will come back and find a docker container that straight up won't build or a package that requires the entire dependency tree to update because one package pushed a minor-version change that ended up requiring a minor version change to Node, then that new version of Node isn't compatible with some hack that another package did in it's C extension.
In fact, I expect some Node developer to read this article and deploy yet another tool that will break _everything_ in the build process. In other languages I don't even think I've ever really thought about dependency resolution in years.
Semver is best effort. It may work but spacebar heating to change VIM mode (or whatever the XKCD joke was) may get lost in your minor update.
But it is still useful. It's like a bloom filter. Most of the time you can happily pull minor or patch upgrades with no issue. Occasionally it will break. But that's less work than analysing every upgrade.
But it is still useful. It's like a bloom filter. Most of the time you can happily pull minor or patch upgrades with no issue. Occasionally it will break. But that's less work than analysing every upgrade.
I absolutely abhor the design of this site. I cannot engage with the content as Im filled with a deep burning hatred of the delivery. Anyone making a personal site: do not do this.
anyone find a way to get rid of the constantly shifting icons at the bottom of the screen? I'm trying to read and the motion keeps pulling my attention away from the words toward the dancing critters.
$("#presence").remove()
And yeah, I did that right away. Fun for a moment but extremely distracting.
And yeah, I did that right away. Fun for a moment but extremely distracting.
Agreed. It's an absolutely useless feature for me to see as well.
I use NoScript, which catches all of these sorts of things by default. I only enable first-party JS when there's a clear good reason why the site should need it, and third-party JS basically never beyond NoScript's default whitelist.
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Reader mode.
Block ###presence with UBlock.
> The important point of this algorithm is that it’s fully deterministic.
The algorithm can be deterministic, but fetching the dependencies of a package is not.
It is usually an HTTP call to some endpoint that might flake out or change its mind.
Lock files were invented to make it either deterministic or fail.
Even with Maven, deterministic builds (such as with Bazel) lock the hashes down.
This article is mistaken.
The algorithm can be deterministic, but fetching the dependencies of a package is not.
It is usually an HTTP call to some endpoint that might flake out or change its mind.
Lock files were invented to make it either deterministic or fail.
Even with Maven, deterministic builds (such as with Bazel) lock the hashes down.
This article is mistaken.
Maven artifacts are immutable, so the whole resolution is deterministic (even if hard to understand), unless you're using snapshot versions (which are mutable) or you use version ranges (which is rare in the Maven world).
Maven artifacts are not immutable. Some maven repositories may prevent overwriting an already published version, but this is not guaranteed. I've personally seen this cause problems where a misconfigured CI job overwrote already published versions.
npm used to allow you to unpublish (and may be overwrite?) published artifacts, but they removed that feature after a few notable events.
Edit: I was not quite correct. It looks like you can still unpublish, but with specific criteria. However, you cannot ever publish a different package using the same version as an already published package.
https://docs.npmjs.com/cli/v8/commands/npm-publish?v=true
https://docs.npmjs.com/policies/unpublish
npm used to allow you to unpublish (and may be overwrite?) published artifacts, but they removed that feature after a few notable events.
Edit: I was not quite correct. It looks like you can still unpublish, but with specific criteria. However, you cannot ever publish a different package using the same version as an already published package.
https://docs.npmjs.com/cli/v8/commands/npm-publish?v=true
https://docs.npmjs.com/policies/unpublish
> Maven artifacts are immutable, so the whole resolution is deterministic
Nope, Maven will grab anything which happens to have a particular filename from `~/.m2`, or failing that it will accept whatever a HTTP server gives it for a particular URL. It can compare downloaded artifacts against a hash; but that's misleading, since those hashes are provided by the same HTTP server as the artifact! (Useful for detecting a corrupt download; useless for knowing anything about the artifact or its provenance, etc.)
This isn't an academic/theoretical issue; I've run into it myself https://discuss.gradle.org/t/plugins-gradle-org-serving-inco...
Nope, Maven will grab anything which happens to have a particular filename from `~/.m2`, or failing that it will accept whatever a HTTP server gives it for a particular URL. It can compare downloaded artifacts against a hash; but that's misleading, since those hashes are provided by the same HTTP server as the artifact! (Useful for detecting a corrupt download; useless for knowing anything about the artifact or its provenance, etc.)
This isn't an academic/theoretical issue; I've run into it myself https://discuss.gradle.org/t/plugins-gradle-org-serving-inco...
If your model is that you trust Maven to never change anything, then sure.
However, I think most people in the reproducible build space would consider Maven an external uncontrolled input.
However, I think most people in the reproducible build space would consider Maven an external uncontrolled input.
> I think most people in the reproducible build space would consider Maven an external uncontrolled input
In an academic sense, you're probably right.
In practice it turns out that this isn't an issue in 99% of cases. Yes, I have once run into a weird issue where Nexus was corrupted and it took some debugging, so it's not like it can't happen, but assuming you don't do anything weird, the assumption that Maven artifacts are immutable is fairly safe.
I'm not saying that lockfiles aren't technically superior or anything, but the failure modes are so rare that people usually don't bother (even in Gradle where lockfiles are technically supported).
In an academic sense, you're probably right.
In practice it turns out that this isn't an issue in 99% of cases. Yes, I have once run into a weird issue where Nexus was corrupted and it took some debugging, so it's not like it can't happen, but assuming you don't do anything weird, the assumption that Maven artifacts are immutable is fairly safe.
I'm not saying that lockfiles aren't technically superior or anything, but the failure modes are so rare that people usually don't bother (even in Gradle where lockfiles are technically supported).
I never understood this. I can delete anything from Nexus and reupload something else in its place. Is this supposed immutability just a convention that's followed?
Yes, you can, if you manually interact with it. Most people don't do that because why would you? You generally use it as a proxy for maven central and similar and to upload your own internal artifacts through maven-publish. I'm not sure if it's the standard setting, but Nexus should typically be configured to prevent you from overwriting non-snapshot versions.
we've all learned about things, not understood them, and thought "wow, these people must be idiots. why would they have made this complicated thing? makes no sense whatsoever. I can't believe these people, idiots, never thought this through like I have."
Most of us, fortunately, don't post these thoughts to the internet for anybody to read.
Most of us, fortunately, don't post these thoughts to the internet for anybody to read.
I worked for 20 years in an ecosystem that didn’t have lockfiles and had reproducible builds before the term was invented, and now you come and tell me that it couldn’t be?
Where did the packages come from? How did you know they hadn’t been changed at the bit-level since last time?
> Be kind. Don't be snarky. Converse curiously; don't cross-examine. Edit out swipes.
While I share the view that TFA is misguided in some ways, this isn't a productive or insightful way to make the point.
While I share the view that TFA is misguided in some ways, this isn't a productive or insightful way to make the point.
Lockfiles are essential for somewhat reproducible builds.
If a transient dependency (not directly referenced) updates, this might introduce different behavior. if you test a piece of software and fix some bugs, the next build shouldn't contain completely different versions of dependencies. This might introduce new bugs.
If a transient dependency (not directly referenced) updates, this might introduce different behavior. if you test a piece of software and fix some bugs, the next build shouldn't contain completely different versions of dependencies. This might introduce new bugs.
> Lockfiles are essential for somewhat reproducible builds.
No they are not. Fully reproducible builds have existed without lockfiles for decades
No they are not. Fully reproducible builds have existed without lockfiles for decades
of distros, they usually refer to an upstream by hash
https://src.fedoraproject.org/rpms/conky/blob/rawhide/f/sour...
also of flathub
https://github.com/flathub/com.belmoussaoui.ashpd.demo/blob/...
"they are not lockfiles!" is a debatable separate topic, but for a wider disconnected ecosystem of sources, you can't really rely on versions being useful for reproducibility
https://src.fedoraproject.org/rpms/conky/blob/rawhide/f/sour...
also of flathub
https://github.com/flathub/com.belmoussaoui.ashpd.demo/blob/...
"they are not lockfiles!" is a debatable separate topic, but for a wider disconnected ecosystem of sources, you can't really rely on versions being useful for reproducibility
> they usually refer to an upstream by hash
exactly the same thing as a lockfile
exactly the same thing as a lockfile
Sure, without package managers.
It's also not about fully reproducible builds, it's about a tradeoff to get modern package manger (npm, cargo, ...) experience and also somewhat reproducible builds.
It's also not about fully reproducible builds, it's about a tradeoff to get modern package manger (npm, cargo, ...) experience and also somewhat reproducible builds.
> modern package manger (npm, cargo, ...) experience
Lol, the word "modern" has truly lost all meaning. Your list of "modern package managers" seems to coincide with a list of legacy tooling I wrote four years ago! https://news.ycombinator.com/item?id=29459209
Lol, the word "modern" has truly lost all meaning. Your list of "modern package managers" seems to coincide with a list of legacy tooling I wrote four years ago! https://news.ycombinator.com/item?id=29459209
...source?
show me one "decades old build" of a major project that isn't based on 1) git hashes 2) fixed semver URLs or 3) exact semver in general.
show me one "decades old build" of a major project that isn't based on 1) git hashes 2) fixed semver URLs or 3) exact semver in general.
The entire article is about why this isn't the case.
It suggests a way more ridiculous fix. As mentioned by other comments in detail (security patches for transient dependencies, multiple references to the same transient dependency).
The article and various comments in this same thread have explained why these are not real issues because the resolution process picks the version 'closest to root'.
In the world of Python-based end-user libraries the pinned (non-ranged) versions result in users being unable to use your library in an environment with other libraries. I’d love to lock my library to numpy 2.3.4, but if the developers of another library pin theirs to 2.3.5 then game over.
For server-side or other completely controlled environments the only good reason to have lock files is if they are actually hashed and thus allow to confirm security audits. Lock files without hashes do not guarantee security (depending on the package registry, of course, but at least in Python world (damn it) the maintainer can re-publish a package with an existing version but different content).
For server-side or other completely controlled environments the only good reason to have lock files is if they are actually hashed and thus allow to confirm security audits. Lock files without hashes do not guarantee security (depending on the package registry, of course, but at least in Python world (damn it) the maintainer can re-publish a package with an existing version but different content).
> I’d love to lock my library to numpy 2.3.4, but if the developers of another library pin theirs to 2.3.5 then game over.
Why? Can’t you specify which version to use?
Why? Can’t you specify which version to use?
[deleted]
> But... why would libpupa’s author write a version range that includes versions that don’t exist yet? How could they know that liblupa 0.7.9, whenever it will be released, will continue to work with libpupa? Surely they can’t see the future? Semantic versioning is a hint, but it has never been a guarantee.
> For that, kids, I have no good answer.
You actually kind-of answer your own question with this bit. Semver not being a guarantee of anything is true, but I'd extend this (and hopefully it's not a stretch): package authors will republish packages with the same version number, but different package contents or dependency specs. Especially newer authors, or authors new to a language or packaging system, or with packages that are very early in their lifecycle.
There are also cases where packages get yanked! While this isn't a universally-available behaviour, many packaging systems acknolwedge that software will ship with unintentional vulnerabilities or serious stability/correctness issues, and give authors the ability to say, "I absolutely have to make sure that nobody can install this specific version again because it could cause problems." In those cases, having flexible subdependency version constraints helps.
It might be helpful to think by analogy here. If a structure is _completely rigid,_ it does have some desirable properties, not the least of which being that you don't have to account for the cascading effects of beams compressing and extending, elements of the structure coming under changing loads, and you can forget about accounting for thermal expansion or contraction and other external factors. Which is great, in a vacuum, but structures exist in environments, and they're subject to wear from usage, heat, cold, rain, and (especially for taller structures), high winds. Incorporating a planned amount of mechanical compliance ends up being the easier way to deal with this, and forces the engineers behind it to account for failure modes that'll arise over its lifetime.
This is weird to me. (Note: i'll use ruby terms like 'gem' and 'bundle' but the same basic deal applies everywhere)
Generally our practice is to pin everything to major versions, in ruby-speak this means like `gem 'net-sftp', '~> 4.0'` which allows 4.0.0 up to 4.9999.9999 but not 5. Exceptions for non-semver such as `pg` and `rails` which we just pin to exact versions and monitor manually. This little file contains our intentions of which gems to update automatically and for any exceptions, why not.
Then we encourage aggressive performances of `bundle update` which pulls in tons of little security patches and minor bugfixes frequently, but intentionally.
Without the lockfile though, you would not be able to do our approach. Every bundle install would be a bundle update, so any random build might upgrade a gem without anyone even meaning to or realizing it, so, your builds are no longer reproducible.
So we'd fix reproducibility by reverting to pinning everything to X.Y.Z, specifically to make the build deterministic, and then count on someone to go in and update every gem's approved version numbers manually on a weekly or monthly basis. (yeah right, definitely will happen).
Generally our practice is to pin everything to major versions, in ruby-speak this means like `gem 'net-sftp', '~> 4.0'` which allows 4.0.0 up to 4.9999.9999 but not 5. Exceptions for non-semver such as `pg` and `rails` which we just pin to exact versions and monitor manually. This little file contains our intentions of which gems to update automatically and for any exceptions, why not.
Then we encourage aggressive performances of `bundle update` which pulls in tons of little security patches and minor bugfixes frequently, but intentionally.
Without the lockfile though, you would not be able to do our approach. Every bundle install would be a bundle update, so any random build might upgrade a gem without anyone even meaning to or realizing it, so, your builds are no longer reproducible.
So we'd fix reproducibility by reverting to pinning everything to X.Y.Z, specifically to make the build deterministic, and then count on someone to go in and update every gem's approved version numbers manually on a weekly or monthly basis. (yeah right, definitely will happen).
What if your project also uses librupa, which also depends on liblupa? Follow the chain of reasoning from that thought, or maybe spend a couple of decades dealing with the horror created by people who didn't, and you'll get to lockfiles.
Having read the article and read some of the comments here, I think many could learn from dependency management rules in the Scala ecosystem.
Scala uses Maven repositories (where the common practice is to use fixed dependency versions) but with different resolution rules:
* When there are conflicting transitive versions, the highest number prevails (not the closest to the root).
* Artifacts declare the versioning scheme they use (SemVer is common, but there are others)
* When resolving a conflict, the resolution checks whether the chosen version is compatible with the evicted version according to the declared version scheme. If incompatible, an error is reported.
* You can manually override a transitive resolution and bypass the error if you need to.
The above has all the advantages of all the approaches advocated for here:
* Deterministic, time-independent resolution.
* No need for lock files.
* No silent eviction of a version in favor of an incompatible one.
* For compatible evictions, everything works out of the box.
* Security update in a transitive dependency? No problem, declare a dependency on the new version. (We have bots that even automatically send PRs for this.)
* Conflicting dependencies, but you know what you're doing? No problem, force an override.
Scala uses Maven repositories (where the common practice is to use fixed dependency versions) but with different resolution rules:
* When there are conflicting transitive versions, the highest number prevails (not the closest to the root).
* Artifacts declare the versioning scheme they use (SemVer is common, but there are others)
* When resolving a conflict, the resolution checks whether the chosen version is compatible with the evicted version according to the declared version scheme. If incompatible, an error is reported.
* You can manually override a transitive resolution and bypass the error if you need to.
The above has all the advantages of all the approaches advocated for here:
* Deterministic, time-independent resolution.
* No need for lock files.
* No silent eviction of a version in favor of an incompatible one.
* For compatible evictions, everything works out of the box.
* Security update in a transitive dependency? No problem, declare a dependency on the new version. (We have bots that even automatically send PRs for this.)
* Conflicting dependencies, but you know what you're doing? No problem, force an override.
Many comments talk about how top-level and transitive dependencies can conflict. I think the article is suggesting you can resolve those by specifying them in the top-level packages and overriding any transitive package versions. If we are doing that anyways, it circles back to if lock files are necessary.
Given that, I still see some consequences:
The burden for testing if a library can use its dependency falls back on the application developer instead of the library developer. A case could be made that, while library developers should test what their libraries are compatible with, the application developer has the ultimate responsibility for making sure everything can work together.
I also see that there would need to be tooling to automate resolutions. If ranges are retained, the resolver needs to report every conflict and force the developer to explicitly specify the version they want at the top-level. Many package managers automatically pick one and write it into the lock file.
If we don’t have lock files, and we want it to be automatic, then we can have it write to the top level package manager and not the lock file. That creates its own problems.
One of those problems comes from humans and tooling writing to the same configuration file. I have seen problems with that idea pop up — most recently, letting letsencrypt modify nginx configs, and now I have to manually edit those. Letsencrypt can no longer manage them. Arguably, we can also say LLMs can work with that, but I am a pessimist when it comes to LLM capabilities.
So in conclusion, I think the article writer’s reasoning is sound, but incomplete. Humans don’t need lockfiles, but our tooling need lockfiles until it is capable of working with the chaos of human-managed package files.
Given that, I still see some consequences:
The burden for testing if a library can use its dependency falls back on the application developer instead of the library developer. A case could be made that, while library developers should test what their libraries are compatible with, the application developer has the ultimate responsibility for making sure everything can work together.
I also see that there would need to be tooling to automate resolutions. If ranges are retained, the resolver needs to report every conflict and force the developer to explicitly specify the version they want at the top-level. Many package managers automatically pick one and write it into the lock file.
If we don’t have lock files, and we want it to be automatic, then we can have it write to the top level package manager and not the lock file. That creates its own problems.
One of those problems comes from humans and tooling writing to the same configuration file. I have seen problems with that idea pop up — most recently, letting letsencrypt modify nginx configs, and now I have to manually edit those. Letsencrypt can no longer manage them. Arguably, we can also say LLMs can work with that, but I am a pessimist when it comes to LLM capabilities.
So in conclusion, I think the article writer’s reasoning is sound, but incomplete. Humans don’t need lockfiles, but our tooling need lockfiles until it is capable of working with the chaos of human-managed package files.
Not quite. Library authors are expected to specify the version that they tested with. (Or the oldest version that they tested with that works.)
If it's an old release of a library then it will specify old dependencies, but you just have to deal with that yourself, because library authors aren't expected to have a crystal ball that tells them which future versions will be broken or have security holes.
If it's an old release of a library then it will specify old dependencies, but you just have to deal with that yourself, because library authors aren't expected to have a crystal ball that tells them which future versions will be broken or have security holes.
If the dependencies are specified as data, such as package.json, or a yaml or xml file, it may be structured enough that tools can still manage it. Npm install has a save flag that lets you do that. Python dep files may be structured enough to do this as well.
If the package specification file is code and not data, then this becomes more problematic. Elixir specified dep as data within code. Arguably, we can add code to read and write from a separate file… but at that point, those might as well be lock files.
If the package specification file is code and not data, then this becomes more problematic. Elixir specified dep as data within code. Arguably, we can add code to read and write from a separate file… but at that point, those might as well be lock files.
Oh the rich irony of using Maven. Maven, apparently has the same basic fundamental issues it had 15 years ago when [redacted] paid me to write a Maven plugin that would detect these version skews. I thought I'd just done it wrong because of the massive, sweeping number of places that it did things that were not just unfortunate, but were serious (you can imagine).
I agree with the premise, just use a specific version of your dependencies, that’s generally fine.
However: You absolutely do need a lock file to store a cryptographic hash of each dependency to ensure that what is fetched has not been tampered with. And users are definitely not typing a hash when adding a new dependency to package.json or Cargo.toml.
However: You absolutely do need a lock file to store a cryptographic hash of each dependency to ensure that what is fetched has not been tampered with. And users are definitely not typing a hash when adding a new dependency to package.json or Cargo.toml.
> And users are definitely not typing a hash when adding a new dependency to package.json or Cargo.toml
I actually much prefer that: specify the git revision to use (i.e. a SHA1 hash). I don't particularly care what "version number" that may or may not have.
I actually much prefer that: specify the git revision to use (i.e. a SHA1 hash). I don't particularly care what "version number" that may or may not have.
The author seems to miss the point of version ranges. Yes, specific versions of dependencies get frozen in the lock file at the moment of building. But the only way to determine these specific versions is to run version resolution across the whole tree. The process finds out which specific versions within the ranges can be chosen to satisfy all the version constraints.
This works with minimal coordination between authors of the dependencies. It becomes a big deal when you have several unrelated dependencies, each transitively requiring that libpupa. The chance they converge on the same exact version is slim. The chance a satisfying version can be found within specified ranges is much higher.
Physical things that are built from many parts have the very same limitation: they need to specify tolerances to account for the differences in production, and would be unable to be assembled otherwise.
This works with minimal coordination between authors of the dependencies. It becomes a big deal when you have several unrelated dependencies, each transitively requiring that libpupa. The chance they converge on the same exact version is slim. The chance a satisfying version can be found within specified ranges is much higher.
Physical things that are built from many parts have the very same limitation: they need to specify tolerances to account for the differences in production, and would be unable to be assembled otherwise.
Yeah but version ranges are fiction. Some says: we require libpupa 0.2.0+. Sure you can find a version in that range. But what if it doesn’t work? How can you know that your library will work with all the future libpupa releases in advance?
Under semver, any dependency version X.Y.* is supposed to be compatible with any software that was built with version X.Z.* when Y > Z. If not, the author of the dependency has broken semver.
"Supposed to" being the operative phrase. This is of little comfort when you need version X.Y for a security fix but your build breaks.
Note that Maven is more complex than others here have mentioned. In some cases, Maven compares versions lexically (e.g. version 1.2 is considered newer than version 1.10).
Dependency management is indeed hell.
"Supposed to" being the operative phrase. This is of little comfort when you need version X.Y for a security fix but your build breaks.
Note that Maven is more complex than others here have mentioned. In some cases, Maven compares versions lexically (e.g. version 1.2 is considered newer than version 1.10).
Dependency management is indeed hell.
It reminds me of the whole mess of Angular 2+ upgrades. It was I believe before lockfiles in npm? Literally every new person joining the team had to get the node_modules handed to them from someone else's machine for the project to work, since `npm install` could never install anything working together.
More often than not things are compatible within a major version. Very often things are compatible within a minor version.
Not being able to build because one thing depends on libpupa 1.2.34.pre5 and another, on 1.2.35 would be a worse outcome, on average.
Not being able to build because one thing depends on libpupa 1.2.34.pre5 and another, on 1.2.35 would be a worse outcome, on average.
This author's approach would probably work "fine" (1) for something like npm, where individual dependencies also have a subtree of their dependencies (and, by extension, "any situation where dependencies are statically linked").
It doesn't work at all for something like Python. In Python, libpupa 1.2.3 depends on liblupa 0.7.8. But libsupa 4.5.6 depends on liblupa 0.7.9. Since the Python environment can only have one version of each module at a time, I need to decide on a universe in which libpupa and libsupa can both have their dependencies satisfied simultaneously. Version ranges give me multiple possible universes, and then for reproducibility (2) I use a lockfile to define one.
(1) npm's dependencies-of-dependencies design introduces its own risks and sharp edges. liblupa has a LupaStuff object in it. It changed very subtly between v0.7.8 and v0.7.9, so subtly that the author didn't think to bump the minor version. And that's okay, because both libpupa and libsupa should be wrapping their dependent objects in an opaque interface anyway; they shouldn't be just barfing liblupa-generated objects directly-accessible into their client code. Oh, you think people actually encapsulate like that? You're hilarious. So eventually, a LupaStuff generated by libpupa is going to get passed to libsupa, which is actually expecting a subtly different object. Will it work? Hahah, who knows! Python actually avoids this failure mode by forcing one coherent environment; since 'pupa and 'supa have to be depending on the same 'lupa (without very fancy module shenanigans), you can have some expectation that their LupaStuff objects will be compatible.
(2) I think the author is hitting on something real though, which is that semantic versioning is a convention, not a guarantee; nobody really knows if your code working with 0.7.8 implies it will work with 0.7.9. It should. Will it? "Cut yourself and find out." In an ideal world, every dependency-of-a-dependency pairing has been hand-tested by someone before it gets to you; in practice, individual software authors are responsible for one web of dependencies, and the Lockfile is a candle in the darkness: "Well, it worked on my machine in this configuration."
It doesn't work at all for something like Python. In Python, libpupa 1.2.3 depends on liblupa 0.7.8. But libsupa 4.5.6 depends on liblupa 0.7.9. Since the Python environment can only have one version of each module at a time, I need to decide on a universe in which libpupa and libsupa can both have their dependencies satisfied simultaneously. Version ranges give me multiple possible universes, and then for reproducibility (2) I use a lockfile to define one.
(1) npm's dependencies-of-dependencies design introduces its own risks and sharp edges. liblupa has a LupaStuff object in it. It changed very subtly between v0.7.8 and v0.7.9, so subtly that the author didn't think to bump the minor version. And that's okay, because both libpupa and libsupa should be wrapping their dependent objects in an opaque interface anyway; they shouldn't be just barfing liblupa-generated objects directly-accessible into their client code. Oh, you think people actually encapsulate like that? You're hilarious. So eventually, a LupaStuff generated by libpupa is going to get passed to libsupa, which is actually expecting a subtly different object. Will it work? Hahah, who knows! Python actually avoids this failure mode by forcing one coherent environment; since 'pupa and 'supa have to be depending on the same 'lupa (without very fancy module shenanigans), you can have some expectation that their LupaStuff objects will be compatible.
(2) I think the author is hitting on something real though, which is that semantic versioning is a convention, not a guarantee; nobody really knows if your code working with 0.7.8 implies it will work with 0.7.9. It should. Will it? "Cut yourself and find out." In an ideal world, every dependency-of-a-dependency pairing has been hand-tested by someone before it gets to you; in practice, individual software authors are responsible for one web of dependencies, and the Lockfile is a candle in the darkness: "Well, it worked on my machine in this configuration."
Don’t see it mentioned in the comments, but the names liblupa and libpupa are based on a penis joke.
The joke is this:
Lupa and Pupa received their paycheques, but the accountant messed up, so Lupa received payment belonging to Pupa, and Pupa — belonging to Lupa.
“To Lupa” sounds like “dick head” when translated to Russian. The ending reads as if Pupa received a dick head, which means that he didn’t receive anything.
I am not sure, but it could that the entire post intent is to get English-speaking folks to discuss “libpupa” and “liblupa”.
The joke is this:
Lupa and Pupa received their paycheques, but the accountant messed up, so Lupa received payment belonging to Pupa, and Pupa — belonging to Lupa.
“To Lupa” sounds like “dick head” when translated to Russian. The ending reads as if Pupa received a dick head, which means that he didn’t receive anything.
I am not sure, but it could that the entire post intent is to get English-speaking folks to discuss “libpupa” and “liblupa”.
Let's say "A" has a direct dependency on "B". The author of "A" knows how they use "B" and are qualified to state what versions of "B" that "A" is compatible with. Yes, some assumptions are made about "B" respecting semver. It's imperfect but helpful. If I'm writing package/app "C" and I consume "A", I'm not qualified to decide what versions of "B" to use without studying the source code of "A". Some situations necessitate this, but it doesn't scale.
As a separate thought, it seems that it would be possible to statically analyze the usage of "B" in the source code of "A" and compare it to the public API for any version of "B" to determine API compatibility. This doesn't account for package incompatibility due to side effects that occur behind the API of "B", but it seems that it would get you pretty far. I assume this would be a solution for purely functional languages.
As a separate thought, it seems that it would be possible to statically analyze the usage of "B" in the source code of "A" and compare it to the public API for any version of "B" to determine API compatibility. This doesn't account for package incompatibility due to side effects that occur behind the API of "B", but it seems that it would get you pretty far. I assume this would be a solution for purely functional languages.
I would agree with this if the author's examples were using hashes, rather than "version numbers". Specifying a hash lets us check whether any random blob of code is or isn't what we specified; versions can't do this, because any blob of code can claim to have any name, version, etc. it likes. As long as we have a hash, we don't need version numbers (or names, though it's usually helpful to provide them).
Using hashes also makes it easier to distribute, fetch, proxy, etc. since there's no need for trust. In contrast, fetching code based only on (name and) version number requires more centralised repositories with a bunch of security hoops to jump through.
Also, on that note, I can plug my own post on the topic: http://www.chriswarbo.net/blog/2024-05-17-lock_files_conside...
Using hashes also makes it easier to distribute, fetch, proxy, etc. since there's no need for trust. In contrast, fetching code based only on (name and) version number requires more centralised repositories with a bunch of security hoops to jump through.
Also, on that note, I can plug my own post on the topic: http://www.chriswarbo.net/blog/2024-05-17-lock_files_conside...
I completely agree.
.NET doesn't have lock files either, and its dependency tree runs great.
Using fixed versions for dependencies is a best practice, in my opinion.
.NET doesn't have lock files either, and its dependency tree runs great.
Using fixed versions for dependencies is a best practice, in my opinion.
This is wrong. DotNet uses packages.lock.json explicitly to support the case where you want to be able to lock transitive dependencies that are specified with a range value, or several other edge cases that might warrant explicitly declaring versions that are absent from csproj or sln files.
https://devblogs.microsoft.com/dotnet/enable-repeatable-pack...
https://learn.microsoft.com/en-us/nuget/consume-packages/pac...
Again - there's no free lunch here.
https://devblogs.microsoft.com/dotnet/enable-repeatable-pack...
https://learn.microsoft.com/en-us/nuget/consume-packages/pac...
Again - there's no free lunch here.
Practically no one uses that.
The OP is well-versed in UX design, so it's hard for me to understand why they shipped that feature showing user avatars in real time [1]. It's mostly useless, distracting, takes up valuable screen space, and feels creepy.
[1] https://imgur.com/a/q1XVDZU
[1] https://imgur.com/a/q1XVDZU
The author is perhaps presenting a good argument for languages/runtimes like JavaScript/Node where dependencies may be isolated and conflicting dependencies may coexist in the dependency tree (e.g., "app -> { libpupa 1.2.3 -> liblupa 0.7.8 }, { libxyz 2.0 -> liblupa 2.4.5 }" would be fine), but the proposed dependency resolution algorithm...
> Our dependency resolution algorithm thus is like this:
> 1. Get the top-level dependency versions
> 2. Look up versions of libraries they depend on
> 3. Look up versions of libraries they depend on
...would fail in languages like Python where dependencies are shared, and the steps 2, 3, etc. would result in conflicting versions.
In these languages, there is good reason to define dependencies in a relaxed way (with constraints that exclude known-bad versions; but without pins to any specific known-to-work version and without constraining only to existing known-good versions) at first. This way dependency resolution always involves some sort of constraint solving (with indeterminate results due to the constraints being open-ended), but then for the sake of reproducibility the result of the constraint solving process may be used as a lockfile. In the Python world this is only done in the final application (the final environment running the code, this may be the test suite in for a pure library) and the pins in the lock aren't published for anyone to reuse.
To reiterate, the originally proposed algorithm doesn't work for languages with shared dependencies. Using version constraints and then lockfiles as a two-layer solution is a common and reasonable way of resolving the dependency topic in these languages.
> Our dependency resolution algorithm thus is like this:
> 1. Get the top-level dependency versions
> 2. Look up versions of libraries they depend on
> 3. Look up versions of libraries they depend on
...would fail in languages like Python where dependencies are shared, and the steps 2, 3, etc. would result in conflicting versions.
In these languages, there is good reason to define dependencies in a relaxed way (with constraints that exclude known-bad versions; but without pins to any specific known-to-work version and without constraining only to existing known-good versions) at first. This way dependency resolution always involves some sort of constraint solving (with indeterminate results due to the constraints being open-ended), but then for the sake of reproducibility the result of the constraint solving process may be used as a lockfile. In the Python world this is only done in the final application (the final environment running the code, this may be the test suite in for a pure library) and the pins in the lock aren't published for anyone to reuse.
To reiterate, the originally proposed algorithm doesn't work for languages with shared dependencies. Using version constraints and then lockfiles as a two-layer solution is a common and reasonable way of resolving the dependency topic in these languages.
To me, it's the opposite. In Python, every time I see 'requirements.txt' without lock files, I cry a bit.
A: You're handling problem X and then unrelated problem Y suddenly arises because you're not locking package versions thoroughly. It's not fun.
B: Now the opposite. You lock all versions of the libs you use. You use renovate or schedule time for updates periodically. You have a thorough test suite that you can automatically exercise when trying the new updates. You can apply the updates and deoy the new version to a test environment to run a final test manually. Things look good. You deploy to production and, quite often, things go smoothly.
A is the blue pill, easy to taste but things are out of your control and will bite you eventually. B is the red pill: you're in control, for the better or worst.
A: You're handling problem X and then unrelated problem Y suddenly arises because you're not locking package versions thoroughly. It's not fun.
B: Now the opposite. You lock all versions of the libs you use. You use renovate or schedule time for updates periodically. You have a thorough test suite that you can automatically exercise when trying the new updates. You can apply the updates and deoy the new version to a test environment to run a final test manually. Things look good. You deploy to production and, quite often, things go smoothly.
A is the blue pill, easy to taste but things are out of your control and will bite you eventually. B is the red pill: you're in control, for the better or worst.
(sorry for the bad Matrix analogy)
Requirements provide absolute maximal bounds on interoperability. (This is why setting bounds to be only very recent versions arbitrarily is unhelpful because barely much of the world exists in bleeding-edge, rolling releases.)
A lockfile provide a specific, concrete, minimized, satisfied solution on what an application or library uses to operate.
Generally, deployed applications have and save lock files so that nothing changes without testing and interactive approval.
Libraries don't usually ship lock files to give the end user more flexibility.
What solved system package dependency hell is allowing multiple versions and configurations of side-by-side dependencies rather than demanding a single, one-size-fits-all dependency that forces exclusion and creates unsatisfiable constraints.
A lockfile provide a specific, concrete, minimized, satisfied solution on what an application or library uses to operate.
Generally, deployed applications have and save lock files so that nothing changes without testing and interactive approval.
Libraries don't usually ship lock files to give the end user more flexibility.
What solved system package dependency hell is allowing multiple versions and configurations of side-by-side dependencies rather than demanding a single, one-size-fits-all dependency that forces exclusion and creates unsatisfiable constraints.
> …why would [an] author write a version range that includes versions that don’t exist yet? … For that, kids, I have no good answer.
When you first take a dependency, you typically want the latest compatible version, to have all the available bug fixes (especially security fixes).
Once you’ve started building on top of a dependency you need stability and have to choose when to take updates.
It’s about validating the dependency… on first use, there’s no question you will be validating its use in your app. Later, you have to control when you take an update so you can ensure you have a chance to validate it.
BTW, of course semantics versioning isn’t perfect. It just lowers the risk of taking certain bug fixes, making it feasible to take them more frequently.
The lock file just holds the state for this mechanism.
When you first take a dependency, you typically want the latest compatible version, to have all the available bug fixes (especially security fixes).
Once you’ve started building on top of a dependency you need stability and have to choose when to take updates.
It’s about validating the dependency… on first use, there’s no question you will be validating its use in your app. Later, you have to control when you take an update so you can ensure you have a chance to validate it.
BTW, of course semantics versioning isn’t perfect. It just lowers the risk of taking certain bug fixes, making it feasible to take them more frequently.
The lock file just holds the state for this mechanism.
This works to a point. It would work well on a curated ecosystem. You could get to the point where one package with one version has everything you need. They are called SDKs.
However for NPM you will hit issues where 2 packages need a different React version and if you want to use them both you need to pick. In addition it is better for security. The lock file is a distributed checksum. Not impervious to supply chain attacks but better equipped than trusting the package author not to retrospectively bump (I guess you could have a hash for this tbat included the downloaded source code and claimed deps).
However for NPM you will hit issues where 2 packages need a different React version and if you want to use them both you need to pick. In addition it is better for security. The lock file is a distributed checksum. Not impervious to supply chain attacks but better equipped than trusting the package author not to retrospectively bump (I guess you could have a hash for this tbat included the downloaded source code and claimed deps).
Semver was always a scam. Or rather, people were glad to scam themselves with semver rather than fixing their dependencies.
Languages ecosystems who try to make it sane for developers usually end up with some sort of snapshot/bom system that lists that are compatible together, and that nudges lib developers to stay compatible with each other. I'm not going to pretend this is easy, because this is hard work on the side of lib devs, but it's invaluable for the community.
Compared to that, people extolling the virtues of semver always seem to miss the mark.
Languages ecosystems who try to make it sane for developers usually end up with some sort of snapshot/bom system that lists that are compatible together, and that nudges lib developers to stay compatible with each other. I'm not going to pretend this is easy, because this is hard work on the side of lib devs, but it's invaluable for the community.
Compared to that, people extolling the virtues of semver always seem to miss the mark.
The author seems to have assumed that readers are going to know that he's talking about NPM and JavaScript, and that "lockfiles" are an NPM-specific feature (to me, it means something completely different).
Perhaps that's a valid assumption for readers of his blog, but once it appears here there are going to be a lot of readers who don't have the context to know what it's about.
Can an "NPM" tag be added to the subject of this post? More generally, I encourage authors to include a bit more context at the top of an article.
Perhaps that's a valid assumption for readers of his blog, but once it appears here there are going to be a lot of readers who don't have the context to know what it's about.
Can an "NPM" tag be added to the subject of this post? More generally, I encourage authors to include a bit more context at the top of an article.
> that "lockfiles" are an NPM-specific feature
… they're not, though. Python & Rust both have lockfiles. I don't know enough Go to say if go.sum counts, but it might also be a lockfile. They're definitely not unique to NPM, because nothing about the problem being solved is unique to NPM.
… they're not, though. Python & Rust both have lockfiles. I don't know enough Go to say if go.sum counts, but it might also be a lockfile. They're definitely not unique to NPM, because nothing about the problem being solved is unique to NPM.
OK, but to me a "lockfile" is a file whose existence signals that some resource is locked.
https://en.wikipedia.org/wiki/File_locking#Lock_files
When I saw the title "We shouldn't have needed lockfiles", I expected something about preferring some other mechanism for resource locking.
More generally, I see a lot of articles that talk about an issue in some language or framework that don't mention that context. Just adding "JavaScript" or "NPM" (or whatever) in the title or near the top of the article would be very helpful.
https://en.wikipedia.org/wiki/File_locking#Lock_files
When I saw the title "We shouldn't have needed lockfiles", I expected something about preferring some other mechanism for resource locking.
More generally, I see a lot of articles that talk about an issue in some language or framework that don't mention that context. Just adding "JavaScript" or "NPM" (or whatever) in the title or near the top of the article would be very helpful.
I generally agree, pinning versions and then having some script to automatically update to capture security updates makes sense, except that it also assumes that every package is just using standard symver, which in my experience is something like 99% true.
But it's also missing the value of hashes, even if every package used symver, then you had a script that could easily update to get recent security updates, we would still gain value from a lockfile hashes to protect against source code changing underneath the same version code.
But it's also missing the value of hashes, even if every package used symver, then you had a script that could easily update to get recent security updates, we would still gain value from a lockfile hashes to protect against source code changing underneath the same version code.
> Write down your top-level dependencies. The computer will figure out transitive ones. They are guaranteed to be the same, since everything is immutable.
dep@ver can resolve to totally different outputs, depending on resolver (repository), DNS, time of day, user location, user network configuration, software author overrides, mistakes by anyone in the supply chain, etc.
everything is very obviously not immutable, this is one of the main motivations for lock files, checksums, etc.
dumb article :(
dep@ver can resolve to totally different outputs, depending on resolver (repository), DNS, time of day, user location, user network configuration, software author overrides, mistakes by anyone in the supply chain, etc.
everything is very obviously not immutable, this is one of the main motivations for lock files, checksums, etc.
dumb article :(
> But if you want an existence proof: Maven. The Java library ecosystem has been going strong for 20 years, and during that time not once have we needed a lockfile. And we are pulling hundreds of libraries just to log two lines of text, so it is actively used at scale.
Maven and Java is simply broken when dealing with transitive dependencies.
I've been hit so many times with running time exception "MethodNotFound" cause two libraries have the same transitive dependency and one version gets picked over the other one.
Maven and Java is simply broken when dealing with transitive dependencies.
I've been hit so many times with running time exception "MethodNotFound" cause two libraries have the same transitive dependency and one version gets picked over the other one.
You can remove the animations and read the article with:
window.presence.remove()
When discoverability and versioning of libraries is more-or-less standardized (a la Cargo/PyPI/NPM), automated tooling for dependency resolution/freezing follows naturally. The build tools for Java and C historically did not have this luxury, which is why their ecosystems have a reputation for caring a lot about backwards compatibility.
I disagree with this blogpost in its entirety. Lockfiles are neither unnecessary, nor are they complicated. The argument presented against lockfiles boils down to a misrepresentation. I also dislike the presentation using the godawful yellow color and the stupid websocket gadget in the footer.
The entire point of lockfiles is to let the user decide when the version resolution algorithm should execute and when it shouldn't. That's all they do and they do it exactly as promised.
The entire point of lockfiles is to let the user decide when the version resolution algorithm should execute and when it shouldn't. That's all they do and they do it exactly as promised.
OMG is it full of yellow. And there I was wondering how one might manage a modem or a mailqueue without a lock file: these are not your father's lockfiles[1]
[1] https://linux.die.net/man/1/lockfile
[1] https://linux.die.net/man/1/lockfile
Version ranges solve the problem of transitive dependencies if libA needs libZ 1.0 and libB needs libZ 1.1 how am I supposed to use both dependencies at the same time when my language doesn't allow for isolation of transitive deps?
So much thought works for not accepting the only real, future-proof, safe, and deterministic solution that is downloading your dependencies' code next to your code forever (a.k.a. vendoring)....
IMHO GO modules is one of the best implementations for reproducible builds (and deps resolution). It takes semantic versioning to the next level.
I somewhat agree because the main package file .eg package.json can act as a lock file if you pin packages to specific versions
No tag other than latest has any special significance to npm itself. Tags can be republished and that's why integrity checks should be in place. Supply chain attacks are happening in open source communities, sadly.
I don't think you can republish to npm.
https://docs.npmjs.com/cli/v11/commands/npm-publish
> The publish will fail if the package name and version combination already exists in the specified registry.
> Once a package is published with a given name and version, that specific name and version combination can never be used again, even if it is removed with npm unpublish.
https://docs.npmjs.com/cli/v11/commands/npm-publish
> The publish will fail if the package name and version combination already exists in the specified registry.
> Once a package is published with a given name and version, that specific name and version combination can never be used again, even if it is removed with npm unpublish.
> if the package name and version combination already exists
I was talking about tags above, eg. "npm i react@next", and you can use tags in your package.json. npm allows you to republish them at will, and you can never force your users to use a specific version.
I was talking about tags above, eg. "npm i react@next", and you can use tags in your package.json. npm allows you to republish them at will, and you can never force your users to use a specific version.
Maybe I suggest to pick a different name for `liblupa`, it is visually close to `libpupa`.
... no mention of golang and minimal version selection?
https://go.dev/ref/mod#minimal-version-selection https://research.swtch.com/vgo-mvs
Instead of a "lock" file, go includes a "sum" file, which basically tells you the checksums of the versions of the modules that were used during a build happened to be, so that you can download them from a central place later and ensure you are working from the same thing (so that any surreptitious changes are identified).
https://go.dev/ref/mod#minimal-version-selection https://research.swtch.com/vgo-mvs
Instead of a "lock" file, go includes a "sum" file, which basically tells you the checksums of the versions of the modules that were used during a build happened to be, so that you can download them from a central place later and ensure you are working from the same thing (so that any surreptitious changes are identified).
`git push —-force` some malware would like a word. I skimmed, did the article mention this?
lockfiles are useful to speed things up, you avoid waterfalling
and as some people mentioned, if a dependency of a dependency provides an important security patch, do you want to wait for your dependency to update first? or do you rely on overrides?
and as some people mentioned, if a dependency of a dependency provides an important security patch, do you want to wait for your dependency to update first? or do you rely on overrides?
[deleted]
This article is written by someone who has never worked outside a single ecosystem
This entire article is a strawman. It fails to even understand the basic important problem lock files try to address.
Sure, I can deterministically resolve the same X.Y.Z versions of packages according to whatever algorithm I like.
But literally everything is mutable (read: can be compromised). Package managers, bytes flying over the network, build servers - all mutable. A published version of a package can be overwritten. Some package managers allow authors to overwrite existing versions.
That means no guarantee of reproducibility. I build again the next day, and I may not download the same code for the same X.Y.Z version of a package. Or my local cached packages may have changed.
So I need checksums on packages. Then I can prove I have the exact same code in those packages. And if I have checksums on packages, I have a lock file.
> lockfiles are an absolutely unnecessary concept that complicates things without a good reason
What is even the complication? The lock file is autogenerated on a successful build and I commit it. It's trivial to use. It's literally all benefit and no downside.
Sure, I can deterministically resolve the same X.Y.Z versions of packages according to whatever algorithm I like.
But literally everything is mutable (read: can be compromised). Package managers, bytes flying over the network, build servers - all mutable. A published version of a package can be overwritten. Some package managers allow authors to overwrite existing versions.
That means no guarantee of reproducibility. I build again the next day, and I may not download the same code for the same X.Y.Z version of a package. Or my local cached packages may have changed.
So I need checksums on packages. Then I can prove I have the exact same code in those packages. And if I have checksums on packages, I have a lock file.
> lockfiles are an absolutely unnecessary concept that complicates things without a good reason
What is even the complication? The lock file is autogenerated on a successful build and I commit it. It's trivial to use. It's literally all benefit and no downside.
What are we trying to achieve by removing the lockfiles?
NPM has, starting with version 0.5.1, an absolutely lovely feature where it simply ignores the package-lock.json file altogether. Or to be more precise, "npm install" regenerates package-lock.json based on package.json. What's the point of "npm upgrade" then? Eh.
[deleted]
I hate this reality.
You can use `npm ci` for "don't update the lockfile, fail if an exact lockfile match can't be collected"
> Imagine you voluntarily made your build non-reproducible by making them depend on time. If I build my app now, I get libpupa 1.2.3 and liblupa 0.7.8. If I repeat the same build in 10 minutes, I’ll get liblupa 0.7.9. Crazy, right? That would be chaos.
No; in fact it's perfectly reasonable, and at the core of what the author doesn't seem to get. Developers have motivations other than reproducibility. The entire reason we have version number schemes like this is so that we can improve our code while also advertising reasonable expectations about compatibility. If we have dependents, then hopefully this also improves their UX indirectly — whether by taking advantage of optimizations we made, not encountering bugs that were actually our fault, etc. Similarly, if we have dependencies, we can seek to take advantage of that.
Upgrading environments is an opportunity to test new configurations, and see if they're any better than what's in existing lockfiles.
> But this is what version ranges essentially are. Instead of saying “libpupa 1.2.3 depends on liblupa 0.7.8”, they are saying “libpupa 1.2.3 depends on whatever the latest liblupa version is at the time of the build.”
But also, developers aren't necessarily using the latest versions of their dependencies locally anyway. If I did pin a version in my requirements, it'd be the one that I tested the build with, not necessarily the one that was most recently released at the time of the build. Not everyone runs an industrial-strength CI system, and for the size of lots of useful packages out there, they really shouldn't have to, either. (And in the pathological case, someone else could re-release while I'm building and testing!)
> But... why would libpupa’s author write a version range that includes versions that don’t exist yet? How could they know that liblupa 0.7.9, whenever it will be released, will continue to work with libpupa? Surely they can’t see the future? Semantic versioning is a hint, but it has never been a guarantee.
The thing about this is that "work with [a dependency]" is not really a binary. New versions also fix things — again, that's the main reason that new versions get released in the first place. Why would I keep writing the software after it's "done" if I don't think there's anything about it that could be fixed?
For that matter, software packages break for external reasons. If I pin my dependency, and that dependency is, say, a wrapper for a third-party web API, and the company operating that website makes a breaking change to the API, then I just locked myself out of new versions of the dependency that cope with that change.
In practice, there are good reasons to not need a guarantee and accept the kind of risk described. Lockfiles exist for those who do need a guarantee that their local environment will be set in concrete (which has other, implicit risks).
I see it as much like personal finance. Yes, investments beyond a HISA may carry some kind of risk. This is worthwhile for most people. And on the flip side, you also can't predict the future inflation rate, and definitely can't predict what will happen to the price of the individual goods and services you care about most.
> The funny thing is, these version ranges end up not being used anyway. You lock your dependencies once in a lockfile and they stay there, unchanged. You don’t even get the good part!
??? What ecosystem is this author talking about? Generating a lockfile doesn't cause the underlying dependency metadata to disappear. You "get the good part" as a developer by periodically regenerating a lockfile, testing the resulting environment and shipping the new lock. Or as a user by grabbing a new lockfile, or by just choosing not to use provided lockfiles.
> “But Niki, you can regenerate the lockfile and pull in all the new dependencies!” Sure. In exactly the same way you can update your top-level dependencies.
Has the author tried both approaches, I wonder?
Not to mention: the lockfile-less world the author describes, would require everyone to pin dependency versions. In practice, this would require dropping support for anything else in the metadata format. And (I did have to look it up) this appears to be the world of Maven that gets cited at the end (cf. https://stackoverflow.com/questions/44521542).
I like choice and freedom in my software, thank you.
> “But Niki, lockfiles help resolve version conflicts!” In what way? Version conflicts don’t happen because of what’s written in dependency files.
Perhaps the author hasn't worked in an ecosystem where people routinely attempt to install new packages into existing environments? Or one where users don't want to have multiple point versions of the same dependency downloaded and installed locally if one of them would satisfy the requirements of other software? Or where dependency graphs never end up having "diamonds"? (Yes, there are package managers that work around this, but not all programming languages can sanely support multiple versions of the same dependency in the same environment.)
No; in fact it's perfectly reasonable, and at the core of what the author doesn't seem to get. Developers have motivations other than reproducibility. The entire reason we have version number schemes like this is so that we can improve our code while also advertising reasonable expectations about compatibility. If we have dependents, then hopefully this also improves their UX indirectly — whether by taking advantage of optimizations we made, not encountering bugs that were actually our fault, etc. Similarly, if we have dependencies, we can seek to take advantage of that.
Upgrading environments is an opportunity to test new configurations, and see if they're any better than what's in existing lockfiles.
> But this is what version ranges essentially are. Instead of saying “libpupa 1.2.3 depends on liblupa 0.7.8”, they are saying “libpupa 1.2.3 depends on whatever the latest liblupa version is at the time of the build.”
But also, developers aren't necessarily using the latest versions of their dependencies locally anyway. If I did pin a version in my requirements, it'd be the one that I tested the build with, not necessarily the one that was most recently released at the time of the build. Not everyone runs an industrial-strength CI system, and for the size of lots of useful packages out there, they really shouldn't have to, either. (And in the pathological case, someone else could re-release while I'm building and testing!)
> But... why would libpupa’s author write a version range that includes versions that don’t exist yet? How could they know that liblupa 0.7.9, whenever it will be released, will continue to work with libpupa? Surely they can’t see the future? Semantic versioning is a hint, but it has never been a guarantee.
The thing about this is that "work with [a dependency]" is not really a binary. New versions also fix things — again, that's the main reason that new versions get released in the first place. Why would I keep writing the software after it's "done" if I don't think there's anything about it that could be fixed?
For that matter, software packages break for external reasons. If I pin my dependency, and that dependency is, say, a wrapper for a third-party web API, and the company operating that website makes a breaking change to the API, then I just locked myself out of new versions of the dependency that cope with that change.
In practice, there are good reasons to not need a guarantee and accept the kind of risk described. Lockfiles exist for those who do need a guarantee that their local environment will be set in concrete (which has other, implicit risks).
I see it as much like personal finance. Yes, investments beyond a HISA may carry some kind of risk. This is worthwhile for most people. And on the flip side, you also can't predict the future inflation rate, and definitely can't predict what will happen to the price of the individual goods and services you care about most.
> The funny thing is, these version ranges end up not being used anyway. You lock your dependencies once in a lockfile and they stay there, unchanged. You don’t even get the good part!
??? What ecosystem is this author talking about? Generating a lockfile doesn't cause the underlying dependency metadata to disappear. You "get the good part" as a developer by periodically regenerating a lockfile, testing the resulting environment and shipping the new lock. Or as a user by grabbing a new lockfile, or by just choosing not to use provided lockfiles.
> “But Niki, you can regenerate the lockfile and pull in all the new dependencies!” Sure. In exactly the same way you can update your top-level dependencies.
Has the author tried both approaches, I wonder?
Not to mention: the lockfile-less world the author describes, would require everyone to pin dependency versions. In practice, this would require dropping support for anything else in the metadata format. And (I did have to look it up) this appears to be the world of Maven that gets cited at the end (cf. https://stackoverflow.com/questions/44521542).
I like choice and freedom in my software, thank you.
> “But Niki, lockfiles help resolve version conflicts!” In what way? Version conflicts don’t happen because of what’s written in dependency files.
Perhaps the author hasn't worked in an ecosystem where people routinely attempt to install new packages into existing environments? Or one where users don't want to have multiple point versions of the same dependency downloaded and installed locally if one of them would satisfy the requirements of other software? Or where dependency graphs never end up having "diamonds"? (Yes, there are package managers that work around this, but not all programming languages can sanely support multiple versions of the same dependency in the same environment.)
> No; in fact it's perfectly reasonable, and at the core of what the author doesn't seem to get. Developers have motivations other than reproducibility. The entire reason we have version number schemes like this is so that we can improve our code while also advertising reasonable expectations about compatibility. If we have dependents, then hopefully this also improves their UX indirectly — whether by taking advantage of optimizations we made, not encountering bugs that were actually our fault, etc. Similarly, if we have dependencies, we can seek to take advantage of that.
I'm actually with the author on this one, but checking-in your lockfile to version-control gets you this.
I'm actually with the author on this one, but checking-in your lockfile to version-control gets you this.
> No; in fact it's perfectly reasonable,
And this is how I once ended spending a Friday evening in a frantic hurry because a dependency decided to drop support for "old" language versions (that is, all except the two newest ones) in its patch-version level update. And by "drop support" I mean "explicitly forbid from building with language versions less than this one".
> The entire reason we have version number schemes like this is so that we can improve our code while also advertising reasonable expectations about compatibility.
Except, of course, some library authors deliberately break semver because they just hate it, see e.g. quote in [0], slightly down the page.
[0] https://dmytro.sh/blog/on-breaking-changes-in-transitive-dep...
And this is how I once ended spending a Friday evening in a frantic hurry because a dependency decided to drop support for "old" language versions (that is, all except the two newest ones) in its patch-version level update. And by "drop support" I mean "explicitly forbid from building with language versions less than this one".
> The entire reason we have version number schemes like this is so that we can improve our code while also advertising reasonable expectations about compatibility.
Except, of course, some library authors deliberately break semver because they just hate it, see e.g. quote in [0], slightly down the page.
[0] https://dmytro.sh/blog/on-breaking-changes-in-transitive-dep...
umm wat
> “But Niki, you can regenerate the lockfile and pull in all the new dependencies!”
> Sure. In exactly the same way you can update your top-level dependencies.
how does updating top-level deps help with updating leaf packages? Is the author assuming that whenever a leaf package is updated, every other package in the dep chain gets immediately new release? That is fundamentally impossible considering that the releases would need to happen serially.
> “But Niki, you can regenerate the lockfile and pull in all the new dependencies!”
> Sure. In exactly the same way you can update your top-level dependencies.
how does updating top-level deps help with updating leaf packages? Is the author assuming that whenever a leaf package is updated, every other package in the dep chain gets immediately new release? That is fundamentally impossible considering that the releases would need to happen serially.
I updated the post, see near the bottom
Ugh, bunch of strawmans and then the author comes to a conclusion.
Not a good article.
Not a good article.
This is a great example of chesterton's fence.
The author of this piece doesn't understand why a top level project might want control of its dependencies dependencies.
That's the flaw in this whole article, if you can't articulate why it's important to be able to control those... don't write an article. You don't understand the problem space.
Semantic versioning isn't perfect, but it's more than a "hint", and it sure as hell beats having to manually patch (or fork) an entire dependency chain to fix a security problem.
The author of this piece doesn't understand why a top level project might want control of its dependencies dependencies.
That's the flaw in this whole article, if you can't articulate why it's important to be able to control those... don't write an article. You don't understand the problem space.
Semantic versioning isn't perfect, but it's more than a "hint", and it sure as hell beats having to manually patch (or fork) an entire dependency chain to fix a security problem.
I think people forget NPM added package-lock.json for the npm@5 release that was rushed out the door to match the next node.js major and was primarily to cut down on server traffic costs as they weren't making money from the FOSS community to sustain themselves.
Author puts up Maven as an example of no lockfiles. Maven does allow a top-level project to control its transitive dependencies (when there is a version conflict, the shallowest dependency wins; the trivial version of this is if you specify it as a top-level dependency).
I think rather that the author doesn't realize that many people in the lockfile world put their lockfiles under version control. Which makes builds reproducible again.
I think rather that the author doesn't realize that many people in the lockfile world put their lockfiles under version control. Which makes builds reproducible again.
Yes, but Maven doesn't support reproducibility (outside of plugins that basically haul in a lockfile). So his whole point is moot (Gradle now does, as an aside: https://docs.gradle.org/current/userguide/dependency_locking...)
Again - I don't think the author is aware enough of the problem space to be making the sort of claim that he is. He doesn't understand the problem lockfiles are solving, so he doesn't know why they exist and wants them gone... chesterton's fence in action.
---
Directly declaring deps is great. It's so great that we'd like to do it for every dependency in many (arguably most) cases. But doing that really sort of sucks when you start getting into even low 10s of deps. Enter... lockfiles and the tooling to auto-resolve them.
Again - I don't think the author is aware enough of the problem space to be making the sort of claim that he is. He doesn't understand the problem lockfiles are solving, so he doesn't know why they exist and wants them gone... chesterton's fence in action.
---
Directly declaring deps is great. It's so great that we'd like to do it for every dependency in many (arguably most) cases. But doing that really sort of sucks when you start getting into even low 10s of deps. Enter... lockfiles and the tooling to auto-resolve them.
>Maven doesn't support reproducibility
I don't think that is true:
https://maven.apache.org/guides/mini/guide-reproducible-buil...
I don't think that is true:
https://maven.apache.org/guides/mini/guide-reproducible-buil...
Caveats from that document, top one basically blows this whole thing up.
Maven can't give you reproducible builds with version ranges, because it has no lockfile.
---
More Details Reproducible Builds for Maven:
Require no version ranges in dependencies, Generally give different results on Windows and Unix because of different newlines. (carriage return linefeed on Windows, linefeed on Unixes) Generally depend on the major version of the JDK used to compile. (Even with source/target defined, each major JDK version changes the generated bytecode) For detailed explanations, see Maven “Reproducible/Verifiable Builds” Wiki page.
Maven can't give you reproducible builds with version ranges, because it has no lockfile.
---
More Details Reproducible Builds for Maven:
Require no version ranges in dependencies, Generally give different results on Windows and Unix because of different newlines. (carriage return linefeed on Windows, linefeed on Unixes) Generally depend on the major version of the JDK used to compile. (Even with source/target defined, each major JDK version changes the generated bytecode) For detailed explanations, see Maven “Reproducible/Verifiable Builds” Wiki page.
I would say that is a reasonable constraint. As you know, version ranges, and other "dynamic" versions in Maven are inherently incompatible with reproducible builds because they are resolved non-deterministically during the build. The most common approach when reproducibility is required is to resolve dynamic dependency versions in source, which is a strategy shared by tools that use lockfiles.
I agree that Maven would be better with lockfile support. However, as with any proposed evolution of Maven, I can imagine it would be quite hairy to implement in a way that is compatible with other mechanisms.
On the other listead caveats, I would add:
- Output line endings are controllable via line.separator, which Maven honors. Input line endings are an important consideration for reproducibility, but also not truly a problem of Maven's reproducibility.
- JDK version can be enforced with Maven Enforcer and/or toolchains.
I agree that Maven would be better with lockfile support. However, as with any proposed evolution of Maven, I can imagine it would be quite hairy to implement in a way that is compatible with other mechanisms.
On the other listead caveats, I would add:
- Output line endings are controllable via line.separator, which Maven honors. Input line endings are an important consideration for reproducibility, but also not truly a problem of Maven's reproducibility.
- JDK version can be enforced with Maven Enforcer and/or toolchains.
This metadata should be in the top of your source as documentation.
We need the metadata. Not a new container.
We need the metadata. Not a new container.
Maven, by default, does not check your transitive dependencies for version conflicts. To do that, you need a frustrating plugin that produces much worse error messages than NPM does: https://ourcraft.wordpress.com/2016/08/22/how-to-read-maven-....
How does Maven resolve dependencies when two libraries pull in different versions? It does something insane. https://maven.apache.org/guides/introduction/introduction-to....
Do not pretend, for even half a second, that dependency resolution is not hell in maven (though I do like that packages are namespaced by creators, npm shoulda stolen that).