change the default action when deleting a release to not delete tag

models/release.go

@@ -249,7 +249,7 @@ func UpdateRelease(gitRepo *git.Repository, rel *Release) (err error) {
 }
 
 // DeleteReleaseByID deletes a release and corresponding Git tag by given ID.
-func DeleteReleaseByID(id int64, u *User) error {
+func DeleteReleaseByID(id int64, u *User, delTag bool) error {
 	rel, err := GetReleaseByID(id)
 	if err != nil {
 		return fmt.Errorf("GetReleaseByID: %v", err)
@@ -267,12 +267,14 @@ func DeleteReleaseByID(id int64, u *User) error {
 		return fmt.Errorf("DeleteReleaseByID: permission denied")
 	}
 
+	if delTag {
 		_, stderr, err := process.ExecDir(-1, repo.RepoPath(),
 			fmt.Sprintf("DeleteReleaseByID (git tag -d): %d", rel.ID),
 			"git", "tag", "-d", rel.TagName)
 		if err != nil && !strings.Contains(stderr, "not found") {
 			return fmt.Errorf("git tag -d: %v - %s", err, stderr)
 		}
+	}
 
 	if _, err = x.Id(rel.ID).Delete(new(Release)); err != nil {
 		return fmt.Errorf("Delete: %v", err)

routers/repo/release.go

@@ -304,7 +304,8 @@ func EditReleasePost(ctx *context.Context, form auth.EditReleaseForm) {
 
 // DeleteRelease delete a release
 func DeleteRelease(ctx *context.Context) {
-	if err := models.DeleteReleaseByID(ctx.QueryInt64("id"), ctx.User); err != nil {
+	delTag := ctx.QueryBool("delTag")
+	if err := models.DeleteReleaseByID(ctx.QueryInt64("id"), ctx.User, delTag); err != nil {
 		ctx.Flash.Error("DeleteReleaseByID: " + err.Error())
 	} else {
 		ctx.Flash.Success(ctx.Tr("repo.release.deletion_success"))