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tangled.org
1package git
2
3import (
4 "errors"
5 "fmt"
6 "os/exec"
7
8 "github.com/go-git/go-git/v5"
9 "github.com/go-git/go-git/v5/config"
10)
11
12func Fork(repoPath, source string) error {
13 _, err := git.PlainClone(repoPath, true, &git.CloneOptions{
14 URL: source,
15 SingleBranch: false,
16 })
17
18 if err != nil {
19 return fmt.Errorf("failed to bare clone repository: %w", err)
20 }
21
22 err = exec.Command("git", "-C", repoPath, "config", "receive.hideRefs", "refs/hidden").Run()
23 if err != nil {
24 return fmt.Errorf("failed to configure hidden refs: %w", err)
25 }
26
27 return nil
28}
29
30func (g *GitRepo) Sync() error {
31 branch := g.h.String()
32
33 fetchOpts := &git.FetchOptions{
34 RefSpecs: []config.RefSpec{
35 config.RefSpec("+" + branch + ":" + branch), // +refs/heads/master:refs/heads/master
36 },
37 }
38
39 err := g.r.Fetch(fetchOpts)
40 if errors.Is(git.NoErrAlreadyUpToDate, err) {
41 return nil
42 } else if err != nil {
43 return fmt.Errorf("failed to fetch origin branch: %s: %w", branch, err)
44 }
45 return nil
46}
47
48// TrackHiddenRemoteRef tracks a hidden remote in the repository. For example,
49// if the feature branch on the fork (forkRef) is feature-1, and the remoteRef,
50// i.e. the branch we want to merge into, is main, this will result in a refspec:
51//
52// +refs/heads/main:refs/hidden/feature-1/main
53func (g *GitRepo) TrackHiddenRemoteRef(forkRef, remoteRef string) error {
54 fetchOpts := &git.FetchOptions{
55 RefSpecs: []config.RefSpec{
56 config.RefSpec(fmt.Sprintf("+refs/heads/%s:refs/hidden/%s/%s", remoteRef, forkRef, remoteRef)),
57 },
58 RemoteName: "origin",
59 }
60
61 err := g.r.Fetch(fetchOpts)
62 if errors.Is(git.NoErrAlreadyUpToDate, err) {
63 return nil
64 } else if err != nil {
65 return fmt.Errorf("failed to fetch hidden remote: %s: %w", forkRef, err)
66 }
67 return nil
68}