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The generated file sets its own directory as the source, including the generated file itself, which causes rebuilds when that file is reformatted. We can avoid this by overriding the source with a filtered version and using that throughout the tests. See https://github.com/NixOS/nixpkgs/pull/320572 for more context
45 lines
1.6 KiB
Nix
45 lines
1.6 KiB
Nix
{ lib, haskell, haskellPackages, runCommand }:
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let
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src = lib.fileset.toSource {
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root = ./local;
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fileset = lib.fileset.unions [
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./local/app
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./local/CHANGELOG.md
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./local/local.cabal
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];
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};
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# This prevents the source from depending on the formatting of the ./local/generated.nix file
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localRaw = haskell.lib.compose.overrideSrc {
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inherit src;
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} (haskellPackages.callPackage ./local/generated.nix {});
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in
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lib.recurseIntoAttrs rec {
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helloFromCabalSdist = haskellPackages.buildFromCabalSdist haskellPackages.hello;
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# A more complicated example with a cabal hook.
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hercules-ci-cnix-store = haskellPackages.buildFromCabalSdist haskellPackages.hercules-ci-cnix-store;
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localFromCabalSdist = haskellPackages.buildFromCabalSdist localRaw;
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# NOTE: ./local refers to the "./." path in `./local/generated.nix`.
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# This test makes sure that localHasNoDirectReference can actually fail if
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# it doesn't do anything. If this test fails, either the test setup was broken,
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# or Haskell packaging has changed the way `src` is treated in such a way that
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# either the test or the design of `buildFromCabalSdist` needs to be reconsidered.
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assumptionLocalHasDirectReference = runCommand "localHasDirectReference" {
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drvPath = builtins.unsafeDiscardOutputDependency localRaw.drvPath;
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} ''
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grep ${src} $drvPath >/dev/null
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touch $out
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'';
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localHasNoDirectReference = runCommand "localHasNoDirectReference" {
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drvPath = builtins.unsafeDiscardOutputDependency localFromCabalSdist.drvPath;
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} ''
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grep -v ${src} $drvPath >/dev/null
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touch $out
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'';
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}
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