Nixery – Docker images on the fly with Nix(nixery.dev)

    with import <nixpkgs> {};
    runCommand
      "my-favourite-program"  # A name for the output
      {
        # A key/value mapping of env vars
        myVar = "myValue";

        # The 'buildInputs' name is special: for each element 'x', the directory '${x}/bin'
        # will be appended to the PATH env var
        buildInputs = [ jq gcc ];
      }
      ''
        # This is a multi-line string containing arbitrary bash code.
        # The output path will be provided via the env var $out so we
        # just need to create a file or folder with that path
        mkdir -p "$out/bin"
        echo "$myVar" > "$out/bin/my-executable"
        chmod +x "$out/bin/my-executable"
      ''

    with import <nixpkgs> {};
    runCommand "foo"
      {
        release = fetchurl {
          url = "http://example.com/foo/foo-1.0.zip";
          hash = "sha256-iqZDwWkQA9XMTICEMCt5xDlmfmiIwzpeE3HJLbgbDXs=";
        };
        buildInputs = [ unzip ];
      }
      ''
        unzip "$release"
        mkdir -p "$out/bin"
        mv foo-1.0/binary "$out/bin/foo"
      ''