| 1 | package main |
| 2 | |
| 3 | import ( |
| 4 | "bytes" |
| 5 | "context" |
| 6 | "io" |
| 7 | "os" |
| 8 | "path/filepath" |
| 9 | "strconv" |
| 10 | "strings" |
| 11 | |
| 12 | "reasonix/internal/gitcmd" |
| 13 | ) |
| 14 | |
| 15 | const ( |
| 16 | workspaceDiffTallyFileLimit = 1 << 20 |
| 17 | workspaceDiffTallyReadLimit = 16 << 20 |
| 18 | ) |
| 19 | |
| 20 | func workspaceGitDiffTally(ctx context.Context, repo gitcmd.Repo, untracked []string) (added, removed int, incomplete bool) { |
| 21 | base := repo.Dir |
| 22 | raw, err := workspaceGitCommand(ctx, repo, "-C", base, "diff", "--numstat", "--no-textconv", "HEAD", "--", ".").Output() |
| 23 | if err != nil && ctx.Err() == nil { |
| 24 | incomplete = true |
| 25 | raw, err = workspaceGitCommand(ctx, repo, "-C", base, "diff", "--numstat", "--no-textconv", "--", ".").Output() |
| 26 | } |
| 27 | if err != nil { |
| 28 | return 0, 0, true |
| 29 | } |
| 30 | for line := range strings.SplitSeq(strings.TrimSpace(string(raw)), "\n") { |
| 31 | fields := strings.Fields(line) |
| 32 | if len(fields) < 2 { |
| 33 | continue |
| 34 | } |
| 35 | n, _ := strconv.Atoi(fields[0]) |
| 36 | added += n |
| 37 | n, _ = strconv.Atoi(fields[1]) |
| 38 | removed += n |
| 39 | } |
| 40 | if len(untracked) == 0 { |
| 41 | return added, removed, incomplete || ctx.Err() != nil |
| 42 | } |
| 43 | root, err := os.OpenRoot(base) |
| 44 | if err != nil { |
| 45 | return added, removed, true |
| 46 | } |
| 47 | defer root.Close() |
| 48 | remaining := int64(workspaceDiffTallyReadLimit) |
| 49 | for _, rel := range untracked { |
| 50 | if ctx.Err() != nil || remaining <= 0 { |
| 51 | return added, removed, true |
| 52 | } |
| 53 | count, partial := workspaceCountFileLines(ctx, root, filepath.FromSlash(rel), &remaining) |
| 54 | added += count |
| 55 | incomplete = incomplete || partial |
| 56 | } |
| 57 | return added, removed, incomplete |
| 58 | } |
| 59 | |
| 60 | func workspaceCountFileLines(ctx context.Context, root *os.Root, path string, remaining *int64) (int, bool) { |
| 61 | if !filepath.IsLocal(path) || ctx.Err() != nil { |
| 62 | return 0, true |
| 63 | } |
| 64 | // Check every component; Root also prevents a concurrent replacement escaping |
| 65 | // the workspace. The platform open rejects final symlinks and blocking FIFOs. |
| 66 | for parent := path; parent != "."; parent = filepath.Dir(parent) { |
| 67 | info, err := root.Lstat(parent) |
| 68 | if err != nil || info.Mode()&os.ModeSymlink != 0 { |
| 69 | return 0, true |
| 70 | } |
| 71 | } |
| 72 | before, err := root.Lstat(path) |
| 73 | if err != nil || !before.Mode().IsRegular() { |
| 74 | return 0, true |
| 75 | } |
| 76 | f, err := openWorkspaceTallyFile(root, path) |
| 77 | if err != nil { |
| 78 | return 0, true |
| 79 | } |
| 80 | defer f.Close() |
| 81 | info, err := f.Stat() |
| 82 | if err != nil || !info.Mode().IsRegular() || !os.SameFile(before, info) { |
| 83 | return 0, true |
| 84 | } |
| 85 | limit := min(int64(workspaceDiffTallyFileLimit), *remaining) |
| 86 | partial := info.Size() > limit |
| 87 | reader := io.LimitReader(f, limit) |
| 88 | buf := make([]byte, 64*1024) |
| 89 | count, total := 0, int64(0) |
| 90 | var last byte |
| 91 | for { |
| 92 | if ctx.Err() != nil { |
| 93 | return count, true |
| 94 | } |
| 95 | n, readErr := reader.Read(buf) |
| 96 | *remaining -= int64(n) |
| 97 | total += int64(n) |
| 98 | if n > 0 { |
| 99 | chunk := buf[:n] |
| 100 | if bytes.IndexByte(chunk, 0) >= 0 { |
| 101 | return 0, false |
| 102 | } |
| 103 | count += bytes.Count(chunk, []byte{'\n'}) |
| 104 | last = chunk[n-1] |
| 105 | } |
| 106 | if readErr != nil { |
| 107 | if readErr != io.EOF { |
| 108 | return count, true |
| 109 | } |
| 110 | break |
| 111 | } |
| 112 | } |
| 113 | if total > 0 && last != '\n' && !partial { |
| 114 | count++ |
| 115 | } |
| 116 | return count, partial |
| 117 | } |
| 118 |