Motivation for this change

Spotifyd is a nice spotify connect server. This adds a spotifyd package and a spotifyd service.

I took over the abandoned #55923, addressing the comments to the best of my ability. I am not very experienced with adding packages or services to NixOS, so likely there are still things to address.

Additional comments

Here are the differences between this pull request and #55923:

• In the package:

  • Version bumped to 0.2.11, which also eliminates the need for the noavxcrypto.patch patch.

  • platforms.unix instead of platforms.all.

• In the service module:

  • As suggested by a comment, removed the dataDir option. As far as I can see, this option does indeed seem unnecessary.

  • As suggested by a comment, use command line option --cache_path /var/lib/spotifyd instead of setting Environment = "HOME=/var/lib/spotifyd".

  • Added spotifyd user belonging to the audio group. (Did not work for me without this.)

Unresolved #55923 comments not addressed by the above changes:

• Using lib.generators.toINI to generate the config line from the config service option. I did not feel I had the competence to make such a change (and it is not clear to me why such a change would be preferable).

• Dropping the --no-daemon from the service start. I tried this which resulted in the service crashing.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nix-review --run "nix-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.