Handle branch name with prefix in GitHub migration

modules/git/repo_branch_nogogit.go

@@ -57,7 +57,10 @@ func (repo *Repository) IsBranchExist(name string) bool {
 		return false
 	}
 
-	return repo.IsReferenceExist(BranchPrefix + name)
+	if !strings.HasPrefix(name, BranchPrefix) {
+		name = BranchPrefix + name
+	}
+	return repo.IsReferenceExist(name)
 }
 
 // GetBranchNames returns branches from the repository, skipping skip initial branches and

modules/git/repo_commit.go

@@ -16,12 +16,18 @@ import (
 
 // GetBranchCommitID returns last commit ID string of given branch.
 func (repo *Repository) GetBranchCommitID(name string) (string, error) {
-	return repo.GetRefCommitID(BranchPrefix + name)
+	if !strings.HasPrefix(name, BranchPrefix) {
+		name = BranchPrefix + name
+	}
+	return repo.GetRefCommitID(name)
 }
 
 // GetTagCommitID returns last commit ID string of given tag.
 func (repo *Repository) GetTagCommitID(name string) (string, error) {
-	return repo.GetRefCommitID(TagPrefix + name)
+	if !strings.HasPrefix(name, TagPrefix) {
+		name = TagPrefix + name
+	}
+	return repo.GetRefCommitID(name)
 }
 
 // GetCommit returns commit object of by ID string.

routers/web/repo/release.go

@@ -16,6 +16,7 @@ import (
 	user_model "code.gitea.io/gitea/models/user"
 	"code.gitea.io/gitea/modules/base"
 	"code.gitea.io/gitea/modules/context"
+	"code.gitea.io/gitea/modules/git"
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/markup"
 	"code.gitea.io/gitea/modules/markup/markdown"
@@ -35,7 +36,7 @@ const (
 // calReleaseNumCommitsBehind calculates given release has how many commits behind release target.
 func calReleaseNumCommitsBehind(repoCtx *context.Repository, release *models.Release, countCache map[string]int64) error {
 	// Fast return if release target is same as default branch.
-	if repoCtx.BranchName == release.Target {
+	if repoCtx.BranchName == strings.TrimPrefix(release.Target, git.BranchPrefix) {
 		release.NumCommitsBehind = repoCtx.CommitsCount - release.NumCommits
 		return nil
 	}