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Use merge tree to detect conflicts when possible (#36400)

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In Git 2.38, the `merge-tree` command introduced the `--write-tree`
option, which works directly on bare repositories. In Git 2.40, a new parameter `--merge-base` introduced so we require Git 2.40 to use the merge tree feature.

This option produces the merged tree object ID, allowing us to perform
diffs between commits without creating a temporary repository. By
avoiding the overhead of setting up and tearing down temporary repos,
this approach delivers a notable performance improvement.

It also fixes a possible situation that conflict files might be empty
but it's a conflict status according to
https://git-scm.com/docs/git-merge-tree#_mistakes_to_avoid

Replace #35542

---------

Signed-off-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
This commit is contained in:
Lunny Xiao
2026-01-27 11:57:20 -08:00
committed by GitHub
parent 125257eacf
commit 1463426a27
29 changed files with 607 additions and 126 deletions
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services/pull/check.go
+3 -3
View File
@@ -246,7 +246,7 @@ func isSignedIfRequired(ctx context.Context, pr *issues_model.PullRequest, doer
// markPullRequestAsMergeable checks if pull request is possible to leaving checking status,
// and set to be either conflict or mergeable.
func markPullRequestAsMergeable(ctx context.Context, pr *issues_model.PullRequest) {
// If the status has not been changed to conflict by testPullRequestTmpRepoBranchMergeable then we are mergeable
// If the status has not been changed to conflict by the conflict checking functions then we are mergeable
if pr.Status == issues_model.PullRequestStatusChecking {
pr.Status = issues_model.PullRequestStatusMergeable
}
@@ -442,8 +442,8 @@ func checkPullRequestMergeable(id int64) {
return
}
if err := testPullRequestBranchMergeable(pr); err != nil {
log.Error("testPullRequestTmpRepoBranchMergeable[%-v]: %v", pr, err)
if err := checkPullRequestBranchMergeable(ctx, pr); err != nil {
log.Error("checkPullRequestBranchMergeable[%-v]: %v", pr, err)
pr.Status = issues_model.PullRequestStatusError
if err := pr.UpdateCols(ctx, "status"); err != nil {
log.Error("update pr [%-v] status to PullRequestStatusError failed: %v", pr, err)