1 files changed, 10 insertions, 2 deletions

diff --git a/services/pull/merge.go b/services/pull/merge.go
index 12e01e8ce7..85bb90b853 100644
--- a/services/pull/merge.go
+++ b/services/pull/merge.go
@@ -34,8 +34,8 @@ import (
 	issue_service "code.gitea.io/gitea/services/issue"
 )
 
-// GetDefaultMergeMessage returns default message used when merging pull request
-func GetDefaultMergeMessage(ctx context.Context, baseGitRepo *git.Repository, pr *issues_model.PullRequest, mergeStyle repo_model.MergeStyle) (message, body string, err error) {
+// getMergeMessage composes the message used when merging a pull request.
+func getMergeMessage(ctx context.Context, baseGitRepo *git.Repository, pr *issues_model.PullRequest, mergeStyle repo_model.MergeStyle, extraVars map[string]string) (message, body string, err error) {
 	if err := pr.LoadBaseRepo(ctx); err != nil {
 		return "", "", err
 	}
@@ -81,6 +81,9 @@ func GetDefaultMergeMessage(ctx context.Context, baseGitRepo *git.Repository, pr
 				vars["HeadRepoOwnerName"] = pr.HeadRepo.OwnerName
 				vars["HeadRepoName"] = pr.HeadRepo.Name
 			}
+			for extraKey, extraValue := range extraVars {
+				vars[extraKey] = extraValue
+			}
 			refs, err := pr.ResolveCrossReferences(ctx)
 			if err == nil {
 				closeIssueIndexes := make([]string, 0, len(refs))
@@ -133,6 +136,11 @@ func expandDefaultMergeMessage(template string, vars map[string]string) (message
 	return os.Expand(message, mapping), os.Expand(body, mapping)
 }
 
+// GetDefaultMergeMessage returns default message used when merging pull request
+func GetDefaultMergeMessage(ctx context.Context, baseGitRepo *git.Repository, pr *issues_model.PullRequest, mergeStyle repo_model.MergeStyle) (message, body string, err error) {
+	return getMergeMessage(ctx, baseGitRepo, pr, mergeStyle, nil)
+}
+
 // Merge merges pull request to base repository.
 // Caller should check PR is ready to be merged (review and status checks)
 func Merge(ctx context.Context, pr *issues_model.PullRequest, doer *user_model.User, baseGitRepo *git.Repository, mergeStyle repo_model.MergeStyle, expectedHeadCommitID, message string, wasAutoMerged bool) error {