archive.go
| 1 | package gitcmd |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "fmt" |
| 6 | "os" |
| 7 | "os/exec" |
| 8 | "path/filepath" |
| 9 | |
| 10 | "github.com/klauspost/compress/zstd" |
| 11 | ) |
| 12 | |
| 13 | // Archive writes <slug>-<ref>.zip, .tar.gz and .tar.zst into outDir. |
| 14 | // Concurrency is bounded by MaxConcurrentArchives, because each job forks git |
| 15 | // and streams the whole tree. |
| 16 | func (g *Git) Archive(ctx context.Context, name, ref, slug, outDir string) error { |
| 17 | p, err := g.repoDir(name) |
| 18 | if err != nil { |
| 19 | return err |
| 20 | } |
| 21 | if !ValidRef(ref) { |
| 22 | return fmt.Errorf("%q: %w", ref, ErrInvalidRef) |
| 23 | } |
| 24 | select { |
| 25 | case g.archiveSem <- struct{}{}: |
| 26 | defer func() { <-g.archiveSem }() |
| 27 | case <-ctx.Done(): |
| 28 | return ctx.Err() |
| 29 | } |
| 30 | |
| 31 | base := filepath.Join(outDir, slug+"-"+ref) |
| 32 | for _, f := range []struct{ format, ext string }{ |
| 33 | {"zip", ".zip"}, |
| 34 | {"tar.gz", ".tar.gz"}, |
| 35 | } { |
| 36 | if _, err := g.run(ctx, runOpts{}, "-C", p, "archive", |
| 37 | "--format="+f.format, "--output="+base+f.ext, "--end-of-options", ref); err != nil { |
| 38 | return fmt.Errorf("archive %s: %w", f.format, err) |
| 39 | } |
| 40 | } |
| 41 | return g.archiveZstd(ctx, p, ref, base+".tar.zst") |
| 42 | } |
| 43 | |
| 44 | // archiveZstd compresses `git archive --format=tar` in-process, so the |
| 45 | // container needs no zstd binary. A failure must not leave a truncated |
| 46 | // artifact, so the partial file is removed. |
| 47 | func (g *Git) archiveZstd(ctx context.Context, repo, ref, outPath string) error { |
| 48 | cmd := exec.CommandContext(ctx, "git", "-C", repo, "archive", "--format=tar", "--end-of-options", ref) |
| 49 | cmd.Env = g.env |
| 50 | stdout, err := cmd.StdoutPipe() |
| 51 | if err != nil { |
| 52 | return err |
| 53 | } |
| 54 | f, err := os.Create(outPath) |
| 55 | if err != nil { |
| 56 | return err |
| 57 | } |
| 58 | err = func() error { |
| 59 | defer f.Close() |
| 60 | if err := cmd.Start(); err != nil { |
| 61 | return err |
| 62 | } |
| 63 | enc, err := zstd.NewWriter(f) |
| 64 | if err != nil { |
| 65 | _ = cmd.Wait() |
| 66 | return err |
| 67 | } |
| 68 | // Copy the whole stream before Wait, otherwise git blocks on a full pipe. |
| 69 | _, copyErr := enc.ReadFrom(stdout) |
| 70 | closeErr := enc.Close() |
| 71 | waitErr := cmd.Wait() |
| 72 | if copyErr != nil { |
| 73 | return copyErr |
| 74 | } |
| 75 | if closeErr != nil { |
| 76 | return closeErr |
| 77 | } |
| 78 | return waitErr |
| 79 | }() |
| 80 | if err != nil { |
| 81 | os.Remove(outPath) |
| 82 | return fmt.Errorf("archive tar.zst: %w", err) |
| 83 | } |
| 84 | return nil |
| 85 | } |
| 86 |