cephfs: add wrapper for ceph_lchown

Signed-off-by: RAJAT SINGH <rajasing@redhat.com>

cephfs/permissions.go

@@ -29,3 +29,12 @@ func (mount *MountInfo) Chown(path string, user uint32, group uint32) error {
 	ret := C.ceph_chown(mount.mount, cPath, C.int(user), C.int(group))
 	return getError(ret)
 }
+
+// Lchown changes the ownership of a file/directory/etc without following symbolic links
+func (mount *MountInfo) Lchown(path string, user uint32, group uint32) error {
+	cPath := C.CString(path)
+	defer C.free(unsafe.Pointer(cPath))
+
+	ret := C.ceph_lchown(mount.mount, cPath, C.int(user), C.int(group))
+	return getError(ret)
+}

cephfs/permissions_test.go

@@ -64,3 +64,32 @@ func TestChown(t *testing.T) {
 	assert.Equal(t, uint32(sx.Uid), bob)
 	assert.Equal(t, uint32(sx.Gid), bob)
 }
+
+func TestLchown(t *testing.T) {
+	dirname := "four"
+	var bob uint32 = 1010
+	var root uint32
+
+	mount := fsConnect(t)
+	defer fsDisconnect(t, mount)
+
+	err := mount.MakeDir(dirname, 0755)
+	assert.NoError(t, err)
+	defer mount.RemoveDir(dirname)
+
+	err = mount.SyncFs()
+	assert.NoError(t, err)
+
+	err = mount.Symlink(dirname, "symlnk")
+	assert.NoError(t, err)
+	defer mount.Unlink("symlnk")
+
+	err = mount.Lchown("symlnk", bob, bob)
+	sx, err := mount.Statx("symlnk", StatxBasicStats, AtSymlinkNofollow)
+	assert.NoError(t, err)
+	assert.Equal(t, uint32(sx.Uid), bob)
+	assert.Equal(t, uint32(sx.Gid), bob)
+	sx, err = mount.Statx(dirname, StatxBasicStats, AtSymlinkNofollow)
+	assert.Equal(t, uint32(sx.Uid), root)
+	assert.Equal(t, uint32(sx.Gid), root)
+}