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Haskell in Nixpkgs/NixOS

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For discussions and questions about Haskell with Nix, cabal2nix and haskellPackages in nixpkgs | Current Docs: https://haskell4nix.readthedocs.io/143 Servers

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8 Jan 2025
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9 Jan 2025
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@joaomoreira:matrix.orgJoão Moreira

how can I move, haskell.lib.compose.justStaticExecutables, haskell.packages.ghc910 etc from all-packages.nix to package.nix so that nixpkgs-vet job succesffully passes (i.e. fits pkgs/by-name)? I tried finding examples on nixpkgs, but they don't seem right / too complex for my derivation.

How it is now:

pkgs/top-level/all-packages.nix

  # Check kind-lang.cabal. GHC2024 >= ghc910.
  kind-lang = haskell.lib.compose.justStaticExecutables (haskell.packages.ghc910.callPackage ../by-name/ki/kind-lang/package.nix {
    haskellPackages = haskell.packages.ghc910;
  });

nixpkgs-vet error

- Because pkgs/by-name/ki/kind-lang exists, the attribute `pkgs.kind-lang` must be defined like

    kind-lang = callPackage ./../by-name/ki/kind-lang/package.nix { /* ... */ };

  However, in this PR, it isn't defined that way. See the definition in pkgs/top-level/all-packages.nix:6458

    kind-lang = haskell.lib.compose.justStaticExecutables (haskell.packages.ghc910.callPackage ../by-name/ki/kind-lang/package.nix {
      haskellPackages = haskell.packages.ghc910;
    });

This PR introduces the problems listed above. Please fix them before merging, otherwise the base branch would break.
To run locally: ./ci/nixpkgs-vet.sh master https://github.com/NixOS/nixpkgs.git
If you're having trouble, ping @NixOS/nixpkgs-vet
Error: Process completed with exit code 1.

pr https://github.com/NixOS/nixpkgs/pull/371934

11:56:35
@b:chreekat.netchreekat João Moreira: by-name/pr/pretty-simple/package.nix might be one place to find inspiration 12:15:58
@b:chreekat.netchreekatI grepped for 'haskellPackages' in by-name and tried to find something similar12:16:11
@me:linj.techlinj
In reply to @joaomoreira:matrix.org

how can I move, haskell.lib.compose.justStaticExecutables, haskell.packages.ghc910 etc from all-packages.nix to package.nix so that nixpkgs-vet job succesffully passes (i.e. fits pkgs/by-name)? I tried finding examples on nixpkgs, but they don't seem right / too complex for my derivation.

How it is now:

pkgs/top-level/all-packages.nix

  # Check kind-lang.cabal. GHC2024 >= ghc910.
  kind-lang = haskell.lib.compose.justStaticExecutables (haskell.packages.ghc910.callPackage ../by-name/ki/kind-lang/package.nix {
    haskellPackages = haskell.packages.ghc910;
  });

nixpkgs-vet error

- Because pkgs/by-name/ki/kind-lang exists, the attribute `pkgs.kind-lang` must be defined like

    kind-lang = callPackage ./../by-name/ki/kind-lang/package.nix { /* ... */ };

  However, in this PR, it isn't defined that way. See the definition in pkgs/top-level/all-packages.nix:6458

    kind-lang = haskell.lib.compose.justStaticExecutables (haskell.packages.ghc910.callPackage ../by-name/ki/kind-lang/package.nix {
      haskellPackages = haskell.packages.ghc910;
    });

This PR introduces the problems listed above. Please fix them before merging, otherwise the base branch would break.
To run locally: ./ci/nixpkgs-vet.sh master https://github.com/NixOS/nixpkgs.git
If you're having trouble, ping @NixOS/nixpkgs-vet
Error: Process completed with exit code 1.

pr https://github.com/NixOS/nixpkgs/pull/371934

another example is nixfmt-rfc-style
12:19:09
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@alexfmpe:matrix.orgalexfmpeI'd like to fix eval/build for a few packages in ghc912, but am a bit confused by the current state the haskell-updates -> staging branch has conflicts on a bunch of configuration-foo.nix files?19:08:06
@alexfmpe:matrix.orgalexfmpeI need to remove at least half a dozen overrides on configuration-ghc910.nix to fix eval (also not sure why these are triggered by ghc912 packages, maybe some side effect of building 9.12 with 9.10)19:09:24
@alexfmpe:matrix.orgalexfmpe* I need to remove at least half a dozen (no longer valid due to stackage containing latest version) overrides on configuration-ghc910.nix to fix eval (also not sure why these are triggered by ghc912 packages, maybe some side effect of building 9.12 with 9.10)19:09:54
@alexfmpe:matrix.orgalexfmpe* I need to remove at least half a dozen (no longer valid due to LTS 23 containing latest version) overrides on configuration-ghc910.nix to fix eval (also not sure why these are triggered by ghc912 packages, maybe some side effect of building 9.12 with 9.10)19:10:02

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