mugit/internal/git/repo.go (view raw)
Oleksandr Smirnov
Oleksandr Smirnov
olexsmir@gmail.com git: set default branch; dont replay on list of default branches (#7)..., 2 months ago
olexsmir@gmail.com git: set default branch; dont replay on list of default branches (#7)..., 2 months ago
| 1 | package git |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "errors" |
| 6 | "fmt" |
| 7 | "path/filepath" |
| 8 | "strings" |
| 9 | "time" |
| 10 | |
| 11 | "github.com/go-git/go-git/v5" |
| 12 | "github.com/go-git/go-git/v5/plumbing" |
| 13 | "github.com/go-git/go-git/v5/plumbing/object" |
| 14 | "github.com/go-git/go-git/v5/plumbing/storer" |
| 15 | "github.com/go-git/go-git/v5/plumbing/transport" |
| 16 | "github.com/go-git/go-git/v5/plumbing/transport/http" |
| 17 | ) |
| 18 | |
| 19 | // Thanks https://git.icyphox.sh/legit/blob/master/git/git.go |
| 20 | |
| 21 | var ( |
| 22 | ErrEmptyRepo = errors.New("repository has no commits") |
| 23 | ErrFileNotFound = errors.New("file not found") |
| 24 | ErrPrivate = errors.New("repository is private") |
| 25 | ) |
| 26 | |
| 27 | type Repo struct { |
| 28 | path string |
| 29 | r *git.Repository |
| 30 | h plumbing.Hash |
| 31 | } |
| 32 | |
| 33 | // Open opens a git repository at path. If ref is empty, HEAD is used. |
| 34 | func Open(path, ref string) (*Repo, error) { |
| 35 | var err error |
| 36 | g := Repo{} |
| 37 | g.path = path |
| 38 | g.r, err = git.PlainOpen(path) |
| 39 | if err != nil { |
| 40 | return nil, fmt.Errorf("opening %s: %w", path, err) |
| 41 | } |
| 42 | |
| 43 | if ref == "" { |
| 44 | head, err := g.r.Head() |
| 45 | if err != nil { |
| 46 | if errors.Is(err, plumbing.ErrReferenceNotFound) { |
| 47 | return &g, nil |
| 48 | } |
| 49 | return nil, fmt.Errorf("getting head of %s: %w", path, err) |
| 50 | } |
| 51 | g.h = head.Hash() |
| 52 | } else { |
| 53 | hash, err := g.r.ResolveRevision(plumbing.Revision(ref)) |
| 54 | if err != nil { |
| 55 | return nil, fmt.Errorf("resolving rev %s for %s: %w", ref, path, err) |
| 56 | } |
| 57 | g.h = *hash |
| 58 | } |
| 59 | return &g, nil |
| 60 | } |
| 61 | |
| 62 | // OpenPublic opens a repository, returns [ErrPrivate] if it's private. |
| 63 | func OpenPublic(path, ref string) (*Repo, error) { |
| 64 | r, err := Open(path, ref) |
| 65 | if err != nil { |
| 66 | return nil, err |
| 67 | } |
| 68 | |
| 69 | isPrivate, err := r.IsPrivate() |
| 70 | if err != nil { |
| 71 | return nil, err |
| 72 | } |
| 73 | |
| 74 | if isPrivate { |
| 75 | return nil, ErrPrivate |
| 76 | } |
| 77 | |
| 78 | return r, nil |
| 79 | } |
| 80 | |
| 81 | func (g *Repo) IsEmpty() bool { |
| 82 | return g.h == plumbing.ZeroHash |
| 83 | } |
| 84 | |
| 85 | // Init initializes a bare repo in path. |
| 86 | func Init(path string) error { |
| 87 | if _, err := git.PlainInit(path, true); err != nil { |
| 88 | return fmt.Errorf("failed to initialize repo: %w", err) |
| 89 | } |
| 90 | return nil |
| 91 | } |
| 92 | |
| 93 | func (g *Repo) Name() string { |
| 94 | name := filepath.Base(g.path) |
| 95 | return strings.TrimSuffix(name, ".git") |
| 96 | } |
| 97 | |
| 98 | func (g *Repo) DefaultBranch() (string, error) { |
| 99 | out, err := g.runGitCmd("rev-parse", "--abbrev-ref", "HEAD") |
| 100 | if err != nil { |
| 101 | return "", fmt.Errorf("failed to get default branch: %w", err) |
| 102 | } |
| 103 | return strings.TrimSpace(string(out)), nil |
| 104 | } |
| 105 | |
| 106 | func (g *Repo) SetDefaultBranch(branch string) error { |
| 107 | b := plumbing.NewBranchReferenceName(branch) |
| 108 | _, err := g.r.Reference(b, true) |
| 109 | if err != nil { |
| 110 | return fmt.Errorf("branch %q not found: %w", branch, err) |
| 111 | } |
| 112 | head := plumbing.NewSymbolicReference(plumbing.HEAD, b) |
| 113 | return g.r.Storer.SetReference(head) |
| 114 | } |
| 115 | |
| 116 | type Commit struct { |
| 117 | Message string |
| 118 | AuthorEmail string |
| 119 | AuthorName string |
| 120 | CommitterName string |
| 121 | CommitterEmail string |
| 122 | Committed time.Time |
| 123 | ChangeID string |
| 124 | Hash string |
| 125 | HashShort string |
| 126 | } |
| 127 | |
| 128 | func newShortHash(h plumbing.Hash) string { return h.String()[:7] } |
| 129 | func newCommit(c *object.Commit) *Commit { |
| 130 | var changeID string |
| 131 | for _, header := range c.ExtraHeaders { |
| 132 | if header.Key == "change-id" { |
| 133 | changeID = header.Value |
| 134 | break |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | return &Commit{ |
| 139 | Message: c.Message, |
| 140 | AuthorEmail: c.Author.Email, |
| 141 | AuthorName: c.Author.Name, |
| 142 | CommitterName: c.Committer.Name, |
| 143 | CommitterEmail: c.Committer.Email, |
| 144 | Committed: c.Committer.When, |
| 145 | ChangeID: changeID, |
| 146 | Hash: c.Hash.String(), |
| 147 | HashShort: newShortHash(c.Hash), |
| 148 | } |
| 149 | } |
| 150 | |
| 151 | const CommitsPage = 150 |
| 152 | |
| 153 | // Commits returns [CommitsPage] commits after the given commit hash cursor. |
| 154 | // If after is empty, starts from HEAD. |
| 155 | func (g *Repo) Commits(after string) ([]*Commit, error) { |
| 156 | if g.IsEmpty() { |
| 157 | return []*Commit{}, nil |
| 158 | } |
| 159 | |
| 160 | from := g.h |
| 161 | if after != "" { |
| 162 | hash, err := g.r.ResolveRevision(plumbing.Revision(after)) |
| 163 | if err != nil { |
| 164 | return nil, fmt.Errorf("invalid cursor: %w", err) |
| 165 | } |
| 166 | from = *hash |
| 167 | } |
| 168 | |
| 169 | ci, err := g.r.Log(&git.LogOptions{ |
| 170 | From: from, |
| 171 | Order: git.LogOrderCommitterTime, |
| 172 | }) |
| 173 | if err != nil { |
| 174 | return nil, fmt.Errorf("commits from ref: %w", err) |
| 175 | } |
| 176 | |
| 177 | // since after commit was shown on prev page, skip it |
| 178 | if after != "" { |
| 179 | ci.Next() |
| 180 | } |
| 181 | |
| 182 | commits := make([]*Commit, 0, CommitsPage) |
| 183 | ci.ForEach(func(c *object.Commit) error { |
| 184 | if len(commits) == CommitsPage { |
| 185 | return storer.ErrStop |
| 186 | } |
| 187 | commits = append(commits, newCommit(c)) |
| 188 | return nil |
| 189 | }) |
| 190 | |
| 191 | return commits, nil |
| 192 | } |
| 193 | |
| 194 | func (g *Repo) LastCommit() (*Commit, error) { |
| 195 | if g.IsEmpty() { |
| 196 | return &Commit{}, nil |
| 197 | } |
| 198 | |
| 199 | c, err := g.r.CommitObject(g.h) |
| 200 | if err != nil { |
| 201 | return nil, fmt.Errorf("last commit: %w", err) |
| 202 | } |
| 203 | |
| 204 | return newCommit(c), nil |
| 205 | } |
| 206 | |
| 207 | type Branch struct { |
| 208 | Name string |
| 209 | LastUpdate time.Time |
| 210 | } |
| 211 | |
| 212 | func (g *Repo) Branches() ([]*Branch, error) { |
| 213 | bi, err := g.r.Branches() |
| 214 | if err != nil { |
| 215 | return nil, fmt.Errorf("branch: %w", err) |
| 216 | } |
| 217 | |
| 218 | var branches []*Branch |
| 219 | err = bi.ForEach(func(r *plumbing.Reference) error { |
| 220 | cmt, cerr := g.r.CommitObject(r.Hash()) |
| 221 | if cerr != nil { |
| 222 | return cerr |
| 223 | } |
| 224 | |
| 225 | branches = append(branches, &Branch{ |
| 226 | Name: r.Name().Short(), |
| 227 | LastUpdate: cmt.Committer.When, |
| 228 | }) |
| 229 | return nil |
| 230 | }) |
| 231 | return branches, err |
| 232 | } |
| 233 | |
| 234 | func (g *Repo) IsGoMod() bool { |
| 235 | _, err := g.FileContent("go.mod") |
| 236 | return err == nil |
| 237 | } |
| 238 | |
| 239 | func (g *Repo) Fetch(ctx context.Context) error { |
| 240 | return g.fetch(ctx, nil) |
| 241 | } |
| 242 | |
| 243 | func (g *Repo) FetchFromGithubWithToken(ctx context.Context, token string) error { |
| 244 | return g.fetch(ctx, &http.BasicAuth{ |
| 245 | Username: "x-access-token", // this can be anything but empty |
| 246 | Password: token, |
| 247 | }) |
| 248 | } |
| 249 | |
| 250 | func (g *Repo) fetch(ctx context.Context, auth transport.AuthMethod) error { |
| 251 | rmt, err := g.r.Remote(originRemote) |
| 252 | if err != nil { |
| 253 | return fmt.Errorf("failed to get remote: %w", err) |
| 254 | } |
| 255 | |
| 256 | if err = rmt.FetchContext(ctx, &git.FetchOptions{ |
| 257 | Auth: auth, |
| 258 | Tags: git.AllTags, |
| 259 | Prune: true, |
| 260 | Force: true, |
| 261 | }); err != nil && !errors.Is(err, git.NoErrAlreadyUpToDate) { |
| 262 | return fmt.Errorf("failed to fetch: %w", err) |
| 263 | } |
| 264 | |
| 265 | // for some reason fetch doesn't change head for empty repos |
| 266 | if !g.IsEmpty() { |
| 267 | return nil |
| 268 | } |
| 269 | |
| 270 | refs, err := rmt.List(&git.ListOptions{Auth: auth}) |
| 271 | if err != nil { |
| 272 | return fmt.Errorf("failed to list references: %w", err) |
| 273 | } |
| 274 | |
| 275 | for _, ref := range refs { |
| 276 | if ref.Name() == plumbing.HEAD { |
| 277 | if err := g.r.Storer.SetReference( |
| 278 | plumbing.NewSymbolicReference(plumbing.HEAD, ref.Target()), |
| 279 | ); err != nil { |
| 280 | return fmt.Errorf("failed to set HEAD: %w", err) |
| 281 | } |
| 282 | break |
| 283 | } |
| 284 | } |
| 285 | |
| 286 | return nil |
| 287 | } |