xerxes901 · HackerTrans

4 месяца назадdiscuss

I plugged my iPhone 16 into my usb-C docking station the other day to charge it and was pretty surprised to discover it just started mirroring my phone screen. Keyboard worked too!

xerxes901

5 месяцев назадdiscuss

Put a script in /etc/systemd/system-generators/ that does something like

  if grep "logging = syslog" /etc/stupid-service/stupid-service.conf >/dev/null; then
    printf "[Unit]\nAfter=rsyslogd.service\n" > "$1/stupid-service.d/10-syslog-dep.conf";
  fi;

> It's pretty basic and straightforward

Postgres config supports line continuations, so the OpenRC service file you quoted is buggy; it could potentially match a file just because some other option contained a multi-line value that had the string "log_destination = syslog" in it.

The whole philosophy of systemd is to move away from these kinds of "simple" and "mostly working" pile-of-shell-script systems to actually-unconditionally-correct configuration that doesn't come with bonus text processing surprises.

xerxes901

5 месяцев назадdiscuss

Yeah parsing config files with regular expressions that may or may not properly handle quoting or line continuations etc is… not a great idea in my opinion.

But of course in this particular case, because systemd makes the /dev/log journal/syslog socket a dependency of every unit by default, there is no need to encode this dependency at all.

Anyway if you really wanted to you could write this script as a generator and have it put a drop-in in /run/systemd/system/postgres.service.d. But… why?

xerxes901

5 месяцев назадdiscuss

> As a trivial example, you can dynamically depend on other services depending on system configuration (as PostgreSQL does)

Depending on what you want to do, a generator might be appropriate:

> Their main purpose is to convert configuration and execution context parameters that are not native to the service manager into dynamically generated unit files, symlinks or unit file drop-ins

xerxes901

6 месяцев назадdiscuss

Something like the stm32mp2 series of MCUs can run Linux and act as a PCIe endpoint you can control from a kernel module on the MCU. So you can program an arbitrary PCIe device that way (although it won’t be setting any speed records, and I think the PHY might be limited to PCIe 1x)

xerxes901

6 месяцев назадdiscuss

Was expecting some real unproductive and entitled whining based on the title, but was pleasantly surprised - someone actually investigating and debugging their wayland issues rather than putting their head in the sand and screaming “X11 FOREVER!!!”

xerxes901

6 месяцев назадdiscuss

Hm. I found this (that memory must be stable wherever a SEH exception could be thrown) surprising, because I thought the unwind information generated by the compiler should be able to reconstruct all the correct variable values during stack unwinding.

TIL

xerxes901

8 месяцев назадdiscuss

I have no idea whether the text was generated from an LLM, but “slop” it absolutely is not - it’s clearly a very logically ordered walkthrough about a very thorough debugging process.

If you call anything that comes out of a model “slop” the term uses all meaning.

xerxes901

8 месяцев назадdiscuss

That’s exactly what it was. He discovered the customer was using a version of ffi that had this “use-after-free” (ish) bug, but the question “is this actually what my customer was seeing or is there _another_ bug lurking” still needed to be answered.

xerxes901

11 месяцев назадdiscuss

I personally know and have (tangentially) worked with the guy and none of what you’ve said is true.

> Look at his CV. Tiny (but impactful) features ///building on existing infrastructure which has already provably scaled to millions and likely has never seen beneath what is a rest api and a react front end///

Off the top of my head he wrote the socket monitoring infrastructure for Zendesk’s unicorn workers, for example.

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