NixOS Integration Tests: Enable again for darwin

[tfc]

Description of changes

This commit: 7b602cf

...disabled NixOS integration tests from running on macOS, while this is now generally supported thanks to @Gabriella439.

This PR re-enables darwin as a supported platform. I had customers pinging me why tests don't work on macos any longer... Can we please merge this in sensible time?

Generally, i feel like the supported lists of platform does not make sense to be configurable on the test level? the other meta options seem fine to have so authors of integration tests can define if they are maintainers, and description etc - but the list of supported systems?

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/)
• 24.05 Release Notes (or backporting 23.05 and 23.11 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
• Fits CONTRIBUTING.md.

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[RaitoBezarius]

Some tests does not make sense on some architectures, e.g. BIOS only exist on x86_64.

[tfc]

@RaitoBezarius thank you for the quick merge! EDIT: Sorry @K900 merged, thank you. :)

Some tests does not make sense on some architectures, e.g. BIOS only exist on x86_64.

That is uncontroversial, but this meta field describes the compatibility of the test runner, not the test itself.

[cole-h]

FYI: this broke ofborg's eval:

$ nix-env -qaP --no-name --out-path --arg checkMeta false --argstr path $PWD -f outpaths.nix --show-trace
error:
       … while evaluating call site

       at «none»:0: (source not available)

       … while calling anonymous lambda

       at /root/nixpkgs/outpaths.nix:48:12:

           47|   tweak = lib.mapAttrs
           48|     (name: val:
             |            ^
           49|       if name == "recurseForDerivations" then true

       … while evaluating call site

       at /root/nixpkgs/lib/attrsets.nix:1214:43:

         1213|     f:
         1214|     listToAttrs (map (n: nameValuePair n (f n)) names);
             |                                           ^
         1215|

       … while calling anonymous lambda

       at /root/nixpkgs/pkgs/top-level/release-lib.nix:145:6:

          144|   testOnCross = crossSystem: metaPatterns: f: forMatchingSystems metaPatterns
          145|     (system: hydraJob' (f (pkgsForCross crossSystem system)));
             |      ^
          146|

       … while evaluating call site

       at /root/nixpkgs/pkgs/top-level/release-lib.nix:145:14:

          144|   testOnCross = crossSystem: metaPatterns: f: forMatchingSystems metaPatterns
          145|     (system: hydraJob' (f (pkgsForCross crossSystem system)));
             |              ^
          146|

       … while calling 'hydraJob'

       at /root/nixpkgs/lib/customisation.nix:388:14:

          387|   */
          388|   hydraJob = drv:
             |              ^
          389|     let

       … while evaluating the attribute 'outPath'

       at /root/nixpkgs/lib/customisation.nix:404:13:

          403|           value = commonAttrs // {
          404|             outPath = output.outPath;
             |             ^
          405|             drvPath = output.drvPath;

       error: attribute 'out' missing

       at /root/nixpkgs/lib/customisation.nix:401:22:

          400|       makeOutput = outputName:
          401|         let output = drv.${outputName}; in
             |                      ^
          402|         { name = outputName;

Revert is in #303187