buildDotnetModule: add passthru.fetch-deps

[IvarWithoutBones]

Motivation for this change

This adds a script which fetches nuget dependencies for all projects using buildDotnetModule, as this was something that you had to do manually before. It should make packaging dotnet applications a lot more user friendly.

For example:

~/nix/nixpkgs > nix-build -A python-language-server.passthru.fetch-deps
/nix/store/p5yfgpgi2rr63gva01l94f2vxm8lwj2k-fetch-python-language-server-deps
~/nix/nixpkgs > /nix/store/p5yfgpgi2rr63gva01l94f2vxm8lwj2k-fetch-python-language-server-deps
/tmp/python-language-server.KuJ /nix/store
  Determining projects to restore...
  Restored /tmp/python-language-server.KuJ/src/Analysis/Core/Impl/Microsoft.Python.Analysis.Core.csproj (in 1.38 sec).
  Restored /tmp/python-language-server.KuJ/src/Parsing/Impl/Microsoft.Python.Parsing.csproj (in 1.38 sec).
  Restored /tmp/python-language-server.KuJ/src/Analysis/Ast/Impl/Microsoft.Python.Analysis.csproj (in 19 ms).
  Restored /tmp/python-language-server.KuJ/src/Core/Impl/Microsoft.Python.Core.csproj (in 17 ms).
  Restored /tmp/python-language-server.KuJ/src/LanguageServer/Impl/Microsoft.Python.LanguageServer.csproj (in 16.54 sec).
Writing lockfile...
Succesfully wrote lockfile to: /tmp/python-language-server-deps.nix

The location the file get's written to is kind of arbitrary, if anyone has a better suggestion please share!

This could potentially be used for auto-updating as well, though I'm not very familair with how that works. I'll have to look into it.

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandbox = true set in nix.conf? (See Nix manual)
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 22.05 Release Notes (or backporting 21.11 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
  • (Release notes changes) Ran nixos/doc/manual/md-to-db.sh to update generated release notes
• Fits CONTRIBUTING.md.

[IvarWithoutBones]

cc @prusnak

[IvarWithoutBones]

/marvin opt-in
/status needs_reviewer

[marvin-mk2]

Hi! I'm an experimental bot. My goal is to guide this PR through its stages, hopefully ending with a merge. You can read up on the usage here.

[marvin-mk2]

Reminder: Please review!

This Pull Request is awaiting review. If you are the assigned reviewer, please have a look. Try to find another reviewer if necessary. If you can't, please say so. If the status is not accurate, please change it. If nothing happens, this PR will be should be put back in the needs_reviewer queue in one day.

---

Note: This feature is currently broken. The bot will not actually change the status. If you see this message multiple times, please request a status change manually.

[prusnak]

There are 0 rebuilds anyway, so let's merge this in.

[legendofmiracles]

This seems to break custom passthru's of derivations. See the failing tests on this PR.
https://github.com/NixOS/nixpkgs/runs/4647348126?check_suite_focus=true

[prusnak]

This seems to break custom passthru's of derivations.

@IvarWithoutBones Can you please have a look?