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haskellPackages.callCabal2nix: accept extraCabal2nixOptions argument #42658

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@roberth roberth commented Jun 27, 2018

Motivation for this change

This should resolve #42051 and #42550

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 nox --run "nox-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)
  • Fits CONTRIBUTING.md.

in overrideCabal (callPackageKeepDeriver expr args) (orig: {
} // haskellSrc2nixArgs);
callPackageArgs = filterAttrs (name: v: name != "extraCabal2nixOptions") args;
haskellSrc2nixArgs = filterAttrs (name: v: name == "extraCabal2nixOptions") args;
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You could just inherit it in the definition of expr.

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Yes, I have thought of that, but we'd have to duplicate the definition of the default argument. I think duplication of definitions is worse than a slightly awkward but clear expression.

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roberth commented Sep 11, 2018

Closing because #44424 was merged to implemented this differently.

@roberth roberth closed this Sep 11, 2018
@basvandijk
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Closed in favor of #44424 which is a bit less magical. @roberth thanks for proposing a different implementation!

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No way to pass cabal2nix arguments to callCabal2nix
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