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Merge pull request #7337 from Radvendii/why-depends-ca

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Fix why-depends for CA derivations
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Théophane Hufschmitt 2022-11-23 20:16:14 +01:00 committed by GitHub
commit bc9692a6b7
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2 changed files with 38 additions and 6 deletions
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39
src/nix/why-depends.cc
View file

@ -83,20 +83,47 @@ struct CmdWhyDepends : SourceExprCommand
{
auto package = parseInstallable(store, _package);
auto packagePath = Installable::toStorePath(getEvalStore(), store, Realise::Outputs, operateOn, package);
/* We don't need to build `dependency`. We try to get the store
* path if it's already known, and if not, then it's not a dependency.
*
* Why? If `package` does depends on `dependency`, then getting the
* store path of `package` above necessitated having the store path
* of `dependency`. The contrapositive is, if the store path of
* `dependency` is not already known at this point (i.e. it's a CA
* derivation which hasn't been built), then `package` did not need it
* to build.
*/
auto dependency = parseInstallable(store, _dependency);
auto dependencyPath = Installable::toStorePath(getEvalStore(), store, Realise::Derivation, operateOn, dependency);
auto dependencyPathHash = dependencyPath.hashPart();
auto derivedDependency = dependency->toDerivedPath();
auto optDependencyPath = std::visit(overloaded {
[](const DerivedPath::Opaque & nodrv) -> std::optional<StorePath> {
return { nodrv.path };
},
[&](const DerivedPath::Built & hasdrv) -> std::optional<StorePath> {
if (hasdrv.outputs.size() != 1) {
throw Error("argument '%s' should evaluate to one store path", dependency->what());
}
auto outputMap = store->queryPartialDerivationOutputMap(hasdrv.drvPath);
auto maybePath = outputMap.find(*hasdrv.outputs.begin());
if (maybePath == outputMap.end()) {
throw Error("unexpected end of iterator");
}
return maybePath->second;
},
}, derivedDependency.raw());
StorePathSet closure;
store->computeFSClosure({packagePath}, closure, false, false);
if (!closure.count(dependencyPath)) {
printError("'%s' does not depend on '%s'",
store->printStorePath(packagePath),
store->printStorePath(dependencyPath));
if (!optDependencyPath.has_value() || !closure.count(*optDependencyPath)) {
printError("'%s' does not depend on '%s'", package->what(), dependency->what());
return;
}
auto dependencyPath = *optDependencyPath;
auto dependencyPathHash = dependencyPath.hashPart();
stopProgressBar(); // FIXME
auto accessor = store->getFSAccessor();

5
tests/ca/why-depends.sh Normal file
View file

@ -0,0 +1,5 @@
source common.sh
export NIX_TESTS_CA_BY_DEFAULT=1
cd .. && source why-depends.sh