fix(integration): repair make test-integration after config field removal

Removing RepositoryConfig.ExcludeExternalTargets left the Bazel query
always including //external:all-targets, which errors under Bzlmod
("no such package 'external'") since this repo's own config sets
bzlmod_enabled: true. Gate the //external:all-targets clause on
BzlmodEnabled instead, matching the behavior documented in
config/README.md.

Removing ExcludedFiles also dropped the "^@@?bazel_tools/" exclusion
the integration test relied on to skip hashing @bazel_tools' files,
some of which (e.g. tools/test/tw.exe, Windows-only) don't exist on
every OS. Restore the equivalent exclusion via the per-request
RequestOptions.ExtraExcludeFilesRegex, which still exists precisely
for this kind of ad hoc exclusion.

Author: yushan8

graphrunner/native.go

@@ -58,7 +58,13 @@ func NewNativeGraphRunner(p NativeGraphRunnerParams) GraphRunner {
 }
 
 func (g *nativeGraphRunner) Compute(ctx context.Context, ws workspace.Workspace) (targethasher.Result, error) {
-	query := "//external:all-targets + deps(//...:all-targets)"
+	bzlmodEnabled := g.config.BzlmodEnabled == nil || *g.config.BzlmodEnabled
+	query := "deps(//...:all-targets)"
+	if !bzlmodEnabled {
+		// //external is only queryable under legacy WORKSPACE resolution;
+		// Bzlmod repos resolve external deps under @@<module> instead.
+		query = "//external:all-targets + " + query
+	}
 	additionalArgs := append(
 		[]string{"--order_output=no", "--proto:locations", "--noproto:default_values"},
 		g.config.BazelExtraArgs...,
@@ -71,8 +77,6 @@ func (g *nativeGraphRunner) Compute(ctx context.Context, ws workspace.Workspace)
 		// --proto:locations: we need to get external file location to make CTC more accurate
 		// --noproto: parameters exclude fields from the output that are not used for hashing anyways, making
 		// proto blob smaller and serialization/deserialization faster
-		// TODO: pass in --enable_workspace or --enable_bzlmod based on the config
-
 		AdditionalArgs: additionalArgs,
 	})
 	g.scope.Timer("bazel_query_duration").Record(time.Since(bazelStart))
@@ -90,7 +94,7 @@ func (g *nativeGraphRunner) Compute(ctx context.Context, ws workspace.Workspace)
 	hashConfig := targethasher.HashConfig{
 		KnownSourceHashes: knownSourceHashes,
 		ExcludedRegex:     g.extraExcludedFiles,
-		UseBzlmod:         g.config.BzlmodEnabled == nil || *g.config.BzlmodEnabled,
+		UseBzlmod:         bzlmodEnabled,
 	}
 
 	hashStart := time.Now()

integration/integration_test.go

@@ -48,6 +48,11 @@ const (
 	configTemplateFile = "testdata/tango-config.yaml.tmpl"
 )
 
+// bazelToolsExcludeRegex excludes @bazel_tools's source files from disk-based hashing.
+// It ships platform-specific files (e.g. tools/test/tw.exe, a Windows-only test wrapper)
+// that don't exist on every OS, so stat-ing them to hash fails on machines missing them.
+var bazelToolsExcludeRegex = []string{"^@@?bazel_tools/"}
+
 func repoRemote(t *testing.T) string {
 	t.Helper()
 	remote := os.Getenv("TANGO_REPO_REMOTE")
@@ -266,6 +271,9 @@ func getChangedTargets(t *testing.T, client pb.TangoYARPCClient, remote, firstSH
 			Remote:  remote,
 			BaseSha: secondSHA,
 		},
+		RequestOptions: &pb.RequestOptions{
+			ExtraExcludeFilesRegex: bazelToolsExcludeRegex,
+		},
 	})
 	require.NoError(t, err, "failed to initiate GetChangedTargets stream")
 
@@ -361,6 +369,9 @@ func TestIntegration_GetTargetGraph(t *testing.T) {
 			Remote:  remote,
 			BaseSha: pinnedSHA,
 		},
+		RequestOptions: &pb.RequestOptions{
+			ExtraExcludeFilesRegex: bazelToolsExcludeRegex,
+		},
 	})
 	require.NoError(t, err, "failed to initiate GetTargetGraph stream")