/**
* Checks whether the {@code traversal}'s path refers to a package directory.
*
* @return the result of the lookup; it contains potentially new {@link TraversalRequest} and
* {@link FileInfo} so the caller should use these instead of the old ones (this happens when
* a package is found, but under a different root than expected)
*/
private static PkgLookupResult checkIfPackage(
Environment env, TraversalRequest traversal, FileInfo rootInfo) throws MissingDepException {
Preconditions.checkArgument(
rootInfo.type.exists() && !rootInfo.type.isFile(), "{%s} {%s}", traversal, rootInfo);
PackageLookupValue pkgLookup =
(PackageLookupValue)
getDependentSkyValue(env, PackageLookupValue.key(traversal.path.getRelativePath()));
if (pkgLookup.packageExists()) {
if (traversal.isGenerated) {
// The traversal's root was a generated directory, but its root-relative path conflicts with
// an existing package.
return PkgLookupResult.conflict(traversal, rootInfo);
} else {
// The traversal's root was a source directory and it defines a package.
Path pkgRoot = pkgLookup.getRoot();
if (!pkgRoot.equals(traversal.path.getRoot())) {
// However the root of this package is different from what we expected. stat() the real
// BUILD file of that package.
traversal = traversal.forChangedRootPath(pkgRoot);
rootInfo = lookUpFileInfo(env, traversal);
Verify.verify(rootInfo.type.exists(), "{%s} {%s}", traversal, rootInfo);
}
return PkgLookupResult.pkg(traversal, rootInfo);
}
} else {
// The traversal's root was a directory (source or generated one), no package exists under the
// same root-relative path.
return PkgLookupResult.directory(traversal, rootInfo);
}
}
