| 65 | } |
| 66 | |
| 67 | func (t *Tar) Sync(ctx context.Context, service string, paths []*PathMapping) error { |
| 68 | containers, err := t.client.ContainersForService(ctx, t.projectName, service) |
| 69 | if err != nil { |
| 70 | return err |
| 71 | } |
| 72 | |
| 73 | var pathsToCopy []PathMapping |
| 74 | var pathsToDelete []string |
| 75 | for _, p := range paths { |
| 76 | if _, err := os.Stat(p.HostPath); err == nil { |
| 77 | pathsToCopy = append(pathsToCopy, *p) |
| 78 | } else if errors.Is(err, fs.ErrNotExist) { |
| 79 | pathsToDelete = append(pathsToDelete, p.ContainerPath) |
| 80 | } else { |
| 81 | return fmt.Errorf("stat %q: %w", p.HostPath, err) |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | var deleteCmd []string |
| 86 | if len(pathsToDelete) != 0 { |
| 87 | deleteCmd = append([]string{"rm", "-rf"}, pathsToDelete...) |
| 88 | } |
| 89 | |
| 90 | var ( |
| 91 | eg errgroup.Group |
| 92 | errMu sync.Mutex |
| 93 | errs = make([]error, 0, len(containers)*2) // max 2 errs per container |
| 94 | ) |
| 95 | |
| 96 | eg.SetLimit(16) // arbitrary limit, adjust to taste :D |
| 97 | for i := range containers { |
| 98 | containerID := containers[i].ID |
| 99 | tarReader := tarArchive(pathsToCopy) |
| 100 | |
| 101 | eg.Go(func() error { |
| 102 | if len(deleteCmd) != 0 { |
| 103 | if err := t.client.Exec(ctx, containerID, deleteCmd, nil); err != nil { |
| 104 | errMu.Lock() |
| 105 | errs = append(errs, fmt.Errorf("deleting paths in %s: %w", containerID, err)) |
| 106 | errMu.Unlock() |
| 107 | } |
| 108 | } |
| 109 | |
| 110 | if err := t.client.Untar(ctx, containerID, tarReader); err != nil { |
| 111 | errMu.Lock() |
| 112 | errs = append(errs, fmt.Errorf("copying files to %s: %w", containerID, err)) |
| 113 | errMu.Unlock() |
| 114 | } |
| 115 | return nil // don't fail-fast; collect all errors |
| 116 | }) |
| 117 | } |
| 118 | |
| 119 | _ = eg.Wait() |
| 120 | return errors.Join(errs...) |
| 121 | } |
| 122 | |
| 123 | type ArchiveBuilder struct { |
| 124 | tw *tar.Writer |