···2727 return nil2828}29293030+func (g *GitRepo) Sync(branch string) error {3131+ fetchOpts := &git.FetchOptions{3232+ RefSpecs: []config.RefSpec{3333+ config.RefSpec(fmt.Sprintf("+refs/heads/%s:refs/heads/%s", branch, branch)),3434+ },3535+ }3636+3737+ err := g.r.Fetch(fetchOpts)3838+ if errors.Is(git.NoErrAlreadyUpToDate, err) {3939+ return nil4040+ } else if err != nil {4141+ return fmt.Errorf("failed to fetch origin branch: %s: %w", branch, err)4242+ }4343+ return nil4444+}4545+3046// TrackHiddenRemoteRef tracks a hidden remote in the repository. For example,3147// if the feature branch on the fork (forkRef) is feature-1, and the remoteRef,3248// i.e. the branch we want to merge into, is main, this will result in a refspec: