UnionFs: when creating symlink, promote directory containing link.

unionfs/unionfs.go

@@ -360,7 +360,10 @@ func (me *UnionFs) Mkdir(path string, mode uint32) (code fuse.Status) {
 }
 
 func (me *UnionFs) Symlink(pointedTo string, linkName string) (code fuse.Status) {
-	code = me.fileSystems[0].Symlink(pointedTo, linkName)
+	code = me.promoteDirsTo(linkName)
+	if code.Ok() {
+		code = me.fileSystems[0].Symlink(pointedTo, linkName)
+	}
 	if code.Ok() {
 		me.removeDeletion(linkName)
 		me.branchCache.GetFresh(linkName)

unionfs/unionfs_test.go

@@ -152,6 +152,17 @@ func TestSymlink(t *testing.T) {
 	}
 }
 
+func TestSymlinkPromote(t *testing.T) {
+	wd, clean := setupUfs(t)
+	defer clean()
+
+	err := os.Mkdir(wd + "/ro/subdir", 0755)
+	CheckSuccess(err)
+	
+	err = os.Symlink("/foobar", wd+"/mount/subdir/link")
+	CheckSuccess(err)
+}
+
 func TestChtimes(t *testing.T) {
 	wd, clean := setupUfs(t)
 	defer clean()