1 files changed, 16 insertions, 1 deletions

diff --git a/services/pull/merge.go b/services/pull/merge.go
index 7e6a214b87..ef797e1ca4 100644
--- a/services/pull/merge.go
+++ b/services/pull/merge.go
@@ -253,6 +253,8 @@ func rawMerge(pr *models.PullRequest, doer *models.User, mergeStyle models.Merge
 		}
 	case models.MergeStyleRebase:
 		fallthrough
+	case models.MergeStyleRebaseUpdate:
+		fallthrough
 	case models.MergeStyleRebaseMerge:
 		// Checkout head branch
 		if err := git.NewCommand("checkout", "-b", stagingBranch, trackingBranch).RunInDirPipeline(tmpBasePath, &outbuf, &errbuf); err != nil {
@@ -305,6 +307,11 @@ func rawMerge(pr *models.PullRequest, doer *models.User, mergeStyle models.Merge
 		outbuf.Reset()
 		errbuf.Reset()
 
+		// not need merge, just update by rebase. so skip
+		if mergeStyle == models.MergeStyleRebaseUpdate {
+			break
+		}
+
 		// Checkout base branch again
 		if err := git.NewCommand("checkout", baseBranch).RunInDirPipeline(tmpBasePath, &outbuf, &errbuf); err != nil {
 			log.Error("git checkout base prior to merge post staging rebase [%s:%s -> %s:%s]: %v\n%s\n%s", pr.HeadRepo.FullName(), pr.HeadBranch, pr.BaseRepo.FullName(), pr.BaseBranch, err, outbuf.String(), errbuf.String())
@@ -410,8 +417,16 @@ func rawMerge(pr *models.PullRequest, doer *models.User, mergeStyle models.Merge
 		pr.ID,
 	)
 
+	var pushCmd *git.Command
+	if mergeStyle == models.MergeStyleRebaseUpdate {
+		// force push the rebase result to head brach
+		pushCmd = git.NewCommand("push", "-f", "head_repo", stagingBranch+":refs/heads/"+pr.HeadBranch)
+	} else {
+		pushCmd = git.NewCommand("push", "origin", baseBranch+":refs/heads/"+pr.BaseBranch)
+	}
+
 	// Push back to upstream.
-	if err := git.NewCommand("push", "origin", baseBranch+":refs/heads/"+pr.BaseBranch).RunInDirTimeoutEnvPipeline(env, -1, tmpBasePath, &outbuf, &errbuf); err != nil {
+	if err := pushCmd.RunInDirTimeoutEnvPipeline(env, -1, tmpBasePath, &outbuf, &errbuf); err != nil {
 		if strings.Contains(errbuf.String(), "non-fast-forward") {
 			return "", &git.ErrPushOutOfDate{
 				StdOut: outbuf.String(),