Merge "Don't allow tree artifacts in mixed builds" into main

		if err != nil {

			return nil, err

		}

		if artifact.IsTreeArtifact &&

			!strings.HasPrefix(artifactPath, "bazel-out/io_bazel_rules_go/") &&

			!strings.HasPrefix(artifactPath, "bazel-out/rules_java_builtin/") {

			// Since we're using ninja as an executor, we can't use tree artifacts. Ninja only

			// considers a file/directory "dirty" when it's mtime changes. Directories' mtimes will

			// only change when a file in the directory is added/removed, but not when files in

			// the directory are changed, or when files in subdirectories are changed/added/removed.

			// Bazel handles this by walking the directory and generating a hash for it after the

			// action runs, which we would have to do as well if we wanted to support these

			// artifacts in mixed builds.

			//

			// However, there are some bazel built-in rules that use tree artifacts. Allow those,

			// but keep in mind that they'll have incrementality issues.

			return nil, fmt.Errorf("tree artifacts are currently not supported in mixed builds: " + artifactPath)

		}

		artifactIdToPath[artifactId(artifact.Id)] = artifactPath

	}