vendor tsgo

tools/tsgo/internal/fswatch/fanotify_linux_test.go

@@ -0,0 +1,121 @@
+//go:build linux
+
+package fswatch
+
+import (
+	"errors"
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+
+	"golang.org/x/sys/unix"
+)
+
+// fanotifyNoRenameWatcher exposes a fanotify backend that skips the
+// FAN_RENAME probe and forces the FAN_MOVED_FROM/FAN_MOVED_TO fallback
+// path. It runs under runForEachWatcher (via additionalTestWatchers)
+// so the broad test matrix exercises both kernel paths on systems where
+// FAN_RENAME would otherwise be selected automatically.
+var fanotifyNoRenameWatcher = &watcher{name: "fanotify-no-rename"}
+
+func init() {
+	if fanotifyAvailable() {
+		fanotifyNoRenameWatcher.factory = func() watcherImpl { return newFanotifyBackend(true) }
+		additionalTestWatchers = append(additionalTestWatchers, fanotifyNoRenameWatcher)
+	}
+}
+
+func TestLinuxFanotifyShutdownBeforeStart(t *testing.T) {
+	t.Parallel()
+	newFanotifyBackend(false).shutdown()
+}
+
+func TestLinuxFanotifyBackendSelection(t *testing.T) {
+	t.Parallel()
+	if !fanotifyAvailable() {
+		t.Skip("fanotify not available")
+	}
+	impl, err := fanotifyWatcher.getImpl()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if _, ok := impl.(*fanotifyBackend); !ok {
+		t.Fatalf("fanotify watcher = %T, want *fanotifyBackend", impl)
+	}
+}
+
+func TestLinuxFanotifySubscribeCleansUpAfterMarkFailure(t *testing.T) {
+	t.Parallel()
+	dir := newTmpDir(t)
+	w := newDirectWatcher(t, dir)
+	b := newFanotifyBackend(false)
+
+	err := b.subscribe(w)
+	var werr *dirWatchError
+	if !errors.As(err, &werr) {
+		t.Fatalf("subscribe error = %v, want *dirWatchError", err)
+	}
+	if werr.dirWatch != w {
+		t.Fatalf("dirWatchError dirWatch = %p, want %p", werr.dirWatch, w)
+	}
+	if len(b.subscriptions) != 0 {
+		t.Fatalf("subscriptions not cleaned up: %d remaining", len(b.subscriptions))
+	}
+}
+
+func TestLinuxFanotifyParseDfidNameRoundTrip(t *testing.T) {
+	t.Parallel()
+	dir := newTmpDir(t)
+	handle, _, err := unix.NameToHandleAt(unix.AT_FDCWD, dir, 0)
+	if err != nil {
+		t.Skipf("NameToHandleAt not supported: %v", err)
+	}
+	var st unix.Statfs_t
+	if err = unix.Statfs(dir, &st); err != nil {
+		t.Fatal(err)
+	}
+	key := makeFanotifyHandleKey(st.Fsid.Val, handle.Type(), handle.Bytes())
+	if key.handle == "" {
+		t.Fatal("empty handle bytes")
+	}
+	handle2, _, err := unix.NameToHandleAt(unix.AT_FDCWD, dir, 0)
+	if err != nil {
+		t.Fatal(err)
+	}
+	key2 := makeFanotifyHandleKey(st.Fsid.Val, handle2.Type(), handle2.Bytes())
+	if key != key2 {
+		t.Fatalf("handle keys differ for same path:\n  1: %+v\n  2: %+v", key, key2)
+	}
+}
+
+func TestFanotifyCrossWatcherSameFs(t *testing.T) {
+	t.Parallel()
+	if !fanotifyAvailable() {
+		t.Skip("fanotify not available")
+	}
+
+	t.Run("Modify", func(t *testing.T) {
+		t.Parallel()
+		dirA, dirB := newTmpDir(t), newTmpDir(t)
+		pathA := filepath.Join(dirA, "child")
+		pathB := filepath.Join(dirB, "child")
+		for _, p := range []string{pathA, pathB} {
+			if err := os.WriteFile(p, []byte("initial"), 0o644); err != nil {
+				t.Fatal(err)
+			}
+		}
+		rA, _ := subscribeFor(t, dirA, Fanotify())
+		rB, _ := subscribeFor(t, dirB, Fanotify())
+
+		if err := os.WriteFile(pathA, []byte("changed"), 0o644); err != nil {
+			t.Fatal(err)
+		}
+		gotA := rA.gather(rA.deadline(), 200*time.Millisecond)
+		assertEventSet(t, gotA, []wantEvent{{EventUpdate, pathA}})
+
+		if gotB := rB.drainQuiet(200 * time.Millisecond); len(gotB) != 0 {
+			t.Fatalf("watcher B got phantom events: %v", toWantEvents(gotB))
+		}
+	})
+}