nix-plugins: pinned to nix 2.18

[Mic92]

the current version is only compatible with nix 2.18. To not have to have to jump back and forth with every nix update this is pinned for now.

Description of changes

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• 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/)
• 24.11 Release Notes (or backporting 23.11 and 24.05 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
• Fits CONTRIBUTING.md.

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[Mic92]

Context: #343032

[shlevy]

Hmm to be clear this is not the current version of nix-plugins, it’s an old version. Once we have 2.24 back in we can bump nix-plugins without the pin, and in general I’d like to ensure nix-plugins is always built against whatever nixpkgs thinks of as nix. Is there a reason we can’t just keep this as-is? We already have the bump commit to rerevert once 2.24 is ready.

[Mic92]

Hmm to be clear this is not the current version of nix-plugins, it’s an old version. Once we have 2.24 back in we can bump nix-plugins without the pin, and in general I’d like to ensure nix-plugins is always built against whatever nixpkgs thinks of as nix. Is there a reason we can’t just keep this as-is? We already have the bump commit to rerevert once 2.24 is ready.

I would like to keep the next pull request that bumps nix small and not have to also bump the whole ecosystem around nix as well. If you want to be updated in lock step with Nix, please make sure you are frequently tracking nixVersions.git and nixVersions.latest and not wait for the nix attribute to bump to fix your plugins. It's too much work otherwise onto the Nix team to keep things building.

[shlevy]

That's a fair request, I'll start tracking against .git and ensure I'm fixing breakages.