object: error returned when uid or gid cannot be found (#5995)

Author: zhijian-pro

cmd/object.go

@@ -355,6 +355,9 @@ func (j *juiceFS) Chmod(key string, mode os.FileMode) error {
 func (j *juiceFS) Chown(key string, owner, group string) error {
 	uid := utils.LookupUser(owner)
 	gid := utils.LookupGroup(group)
+	if uid == -1 || gid == -1 {
+		return fmt.Errorf("user(%s):group(%s) not found", owner, group)
+	}
 	f, err := j.jfs.Lopen(ctx, j.path(key), 0)
 	if err != 0 {
 		return err

pkg/object/file.go

@@ -18,6 +18,7 @@ package object
 
 import (
 	"bytes"
+	"fmt"
 	"io"
 	"io/fs"
 	"math/rand"
@@ -340,6 +341,9 @@ func (d *filestore) Chown(key string, owner, group string) error {
 	p := d.path(key)
 	uid := utils.LookupUser(owner)
 	gid := utils.LookupGroup(group)
+	if uid == -1 || gid == -1 {
+		return fmt.Errorf("user(%s):group(%s) not found", owner, group)
+	}
 	return os.Lchown(p, uid, gid)
 }
 

pkg/object/nfs.go

@@ -389,6 +389,9 @@ func (n *nfsStore) Chmod(path string, mode os.FileMode) error {
 func (n *nfsStore) Chown(path string, owner, group string) error {
 	uid := utils.LookupUser(owner)
 	gid := utils.LookupGroup(group)
+	if uid == -1 || gid == -1 {
+		return fmt.Errorf("user(%s):group(%s) not found", owner, group)
+	}
 	return n.setAttr(path, func(attr *nfs.Fattr) nfs.Sattr3 {
 		return nfs.Sattr3{
 			UID: nfs.SetUID{

pkg/object/sftp.go

@@ -290,6 +290,9 @@ func (f *sftpStore) Chown(key string, owner, group string) error {
 	defer f.putSftpConnection(&c, err)
 	uid := utils.LookupUser(owner)
 	gid := utils.LookupGroup(group)
+	if uid == -1 || gid == -1 {
+		return fmt.Errorf("user(%s):group(%s) not found", owner, group)
+	}
 	return c.sftpClient.Chown(f.path(key), uid, gid)
 }