forked from lix-project/lix
add explanation and test
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@ -83,6 +83,17 @@ struct CmdWhyDepends : SourceExprCommand
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{
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auto package = parseInstallable(store, _package);
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auto packagePath = Installable::toStorePath(getEvalStore(), store, Realise::Outputs, operateOn, package);
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/* We don't need to build `dependency`. We try to get the store
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* path if it's already known, and if not, then it's not a dependency.
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*
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* Why? If `package` does depends on `dependency`, then getting the
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* store path of `package` above necessitated having the store path
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* of `dependency`. The contrapositive is, if the store path of
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* `dependency` is not already known at this point (i.e. it's a CA
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* derivation which hasn't been built), then `package` did not need it
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* to build.
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*/
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auto dependency = parseInstallable(store, _dependency);
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auto derivedDependency = dependency->toDerivedPath();
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auto optDependencyPath = std::visit(overloaded {
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5
tests/ca/why-depends.sh
Normal file
5
tests/ca/why-depends.sh
Normal file
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@ -0,0 +1,5 @@
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source common.sh
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export NIX_TESTS_CA_BY_DEFAULT=1
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cd .. && source why-depends.sh
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