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My own copy of Tangled :)
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9.2 kB · 460 lines
Go
at master
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import ( "archive/tar" "bytes" "fmt" "io" "io/fs" "os/exec" "path" "sort" "strconv" "strings" "sync" "time"
"github.com/dgraph-io/ristretto" "github.com/go-git/go-git/v5" "github.com/go-git/go-git/v5/plumbing" "github.com/go-git/go-git/v5/plumbing/object" "tangled.sh/tangled.sh/core/types")
var ( commitCache *ristretto.Cache cacheMu sync.RWMutex)
func init() { cache, _ := ristretto.NewCache(&ristretto.Config{ NumCounters: 1e7, MaxCost: 1 << 30, BufferItems: 64, TtlTickerDurationInSec: 120, }) commitCache = cache}
var ( ErrBinaryFile = fmt.Errorf("binary file"))
type GitRepo struct { path string r *git.Repository h plumbing.Hash}
type TagList struct { refs []*TagReference r *git.Repository}
// TagReference is used to list both tag and non-annotated tags.// Non-annotated tags should only contains a reference.// Annotated tags should contain its reference and its tag information.type TagReference struct { ref *plumbing.Reference tag *object.Tag}
// infoWrapper wraps the property of a TreeEntry so it can export fs.FileInfo// to tar WriteHeadertype infoWrapper struct { name string size int64 mode fs.FileMode modTime time.Time isDir bool}
func (self *TagList) Len() int { return len(self.refs)}
func (self *TagList) Swap(i, j int) { self.refs[i], self.refs[j] = self.refs[j], self.refs[i]}
// sorting tags in reverse chronological orderfunc (self *TagList) Less(i, j int) bool { var dateI time.Time var dateJ time.Time
if self.refs[i].tag != nil { dateI = self.refs[i].tag.Tagger.When } else { c, err := self.r.CommitObject(self.refs[i].ref.Hash()) if err != nil { dateI = time.Now() } else { dateI = c.Committer.When } }
if self.refs[j].tag != nil { dateJ = self.refs[j].tag.Tagger.When } else { c, err := self.r.CommitObject(self.refs[j].ref.Hash()) if err != nil { dateJ = time.Now() } else { dateJ = c.Committer.When } }
return dateI.After(dateJ)}
func Open(path string, ref string) (*GitRepo, error) { var err error g := GitRepo{path: path} g.r, err = git.PlainOpen(path) if err != nil { return nil, fmt.Errorf("opening %s: %w", path, err) }
if ref == "" { head, err := g.r.Head() if err != nil { return nil, fmt.Errorf("getting head of %s: %w", path, err) } g.h = head.Hash() } else { hash, err := g.r.ResolveRevision(plumbing.Revision(ref)) if err != nil { return nil, fmt.Errorf("resolving rev %s for %s: %w", ref, path, err) } g.h = *hash } return &g, nil}
func PlainOpen(path string) (*GitRepo, error) { var err error g := GitRepo{path: path} g.r, err = git.PlainOpen(path) if err != nil { return nil, fmt.Errorf("opening %s: %w", path, err) } return &g, nil}
func (g *GitRepo) Commits() ([]*object.Commit, error) { ci, err := g.r.Log(&git.LogOptions{From: g.h}) if err != nil { return nil, fmt.Errorf("commits from ref: %w", err) }
commits := []*object.Commit{} ci.ForEach(func(c *object.Commit) error { commits = append(commits, c) return nil })
return commits, nil}
func (g *GitRepo) LastCommit() (*object.Commit, error) { c, err := g.r.CommitObject(g.h) if err != nil { return nil, fmt.Errorf("last commit: %w", err) } return c, nil}
func (g *GitRepo) FileContent(path string) (string, error) { c, err := g.r.CommitObject(g.h) if err != nil { return "", fmt.Errorf("commit object: %w", err) }
tree, err := c.Tree() if err != nil { return "", fmt.Errorf("file tree: %w", err) }
file, err := tree.File(path) if err != nil { return "", err }
isbin, _ := file.IsBinary()
if !isbin { return file.Contents() } else { return "", ErrBinaryFile }}
func (g *GitRepo) Tags() ([]*TagReference, error) { iter, err := g.r.Tags() if err != nil { return nil, fmt.Errorf("tag objects: %w", err) }
tags := make([]*TagReference, 0)
if err := iter.ForEach(func(ref *plumbing.Reference) error { obj, err := g.r.TagObject(ref.Hash()) switch err { case nil: tags = append(tags, &TagReference{ ref: ref, tag: obj, }) case plumbing.ErrObjectNotFound: tags = append(tags, &TagReference{ ref: ref, }) default: return err } return nil }); err != nil { return nil, err }
tagList := &TagList{r: g.r, refs: tags} sort.Sort(tagList) return tags, nil}
func (g *GitRepo) Branches() ([]*plumbing.Reference, error) { bi, err := g.r.Branches() if err != nil { return nil, fmt.Errorf("branchs: %w", err) }
branches := []*plumbing.Reference{}
_ = bi.ForEach(func(ref *plumbing.Reference) error { branches = append(branches, ref) return nil })
return branches, nil}
func (g *GitRepo) Branch(name string) (*plumbing.Reference, error) { ref, err := g.r.Reference(plumbing.NewBranchReferenceName(name), false) if err != nil { return nil, fmt.Errorf("branch: %w", err) }
if !ref.Name().IsBranch() { return nil, fmt.Errorf("branch: %s is not a branch", ref.Name()) }
return ref, nil}
func (g *GitRepo) SetDefaultBranch(branch string) error { ref := plumbing.NewSymbolicReference(plumbing.HEAD, plumbing.NewBranchReferenceName(branch)) return g.r.Storer.SetReference(ref)}
func (g *GitRepo) FindMainBranch() (string, error) { ref, err := g.r.Head() if err != nil { return "", fmt.Errorf("unable to find main branch: %w", err) } if ref.Name().IsBranch() { return strings.TrimPrefix(string(ref.Name()), "refs/heads/"), nil }
return "", fmt.Errorf("unable to find main branch: %w", err)}
// WriteTar writes itself from a tree into a binary tar file format.// prefix is root folder to be appended.func (g *GitRepo) WriteTar(w io.Writer, prefix string) error { tw := tar.NewWriter(w) defer tw.Close()
c, err := g.r.CommitObject(g.h) if err != nil { return fmt.Errorf("commit object: %w", err) }
tree, err := c.Tree() if err != nil { return err }
walker := object.NewTreeWalker(tree, true, nil) defer walker.Close()
name, entry, err := walker.Next() for ; err == nil; name, entry, err = walker.Next() { info, err := newInfoWrapper(name, prefix, &entry, tree) if err != nil { return err }
header, err := tar.FileInfoHeader(info, "") if err != nil { return err }
err = tw.WriteHeader(header) if err != nil { return err }
if !info.IsDir() { file, err := tree.File(name) if err != nil { return err }
reader, err := file.Blob.Reader() if err != nil { return err }
_, err = io.Copy(tw, reader) if err != nil { reader.Close() return err } reader.Close() } }
return nil}
func (g *GitRepo) LastCommitForPath(path string) (*types.LastCommitInfo, error) { cacheKey := fmt.Sprintf("%s:%s", g.h.String(), path) cacheMu.RLock() if commitInfo, found := commitCache.Get(cacheKey); found { cacheMu.RUnlock() return commitInfo.(*types.LastCommitInfo), nil } cacheMu.RUnlock()
cmd := exec.Command("git", "-C", g.path, "log", g.h.String(), "-1", "--format=%H %ct", "--", path)
var out bytes.Buffer cmd.Stdout = &out cmd.Stderr = &out
if err := cmd.Run(); err != nil { return nil, fmt.Errorf("failed to get commit hash: %w", err) }
output := strings.TrimSpace(out.String()) if output == "" { return nil, fmt.Errorf("no commits found for path: %s", path) }
parts := strings.SplitN(output, " ", 2) if len(parts) < 2 { return nil, fmt.Errorf("unexpected commit log format") }
commitHash := parts[0] commitTimeUnix, err := strconv.ParseInt(parts[1], 10, 64) if err != nil { return nil, fmt.Errorf("parsing commit time: %w", err) } commitTime := time.Unix(commitTimeUnix, 0)
hash := plumbing.NewHash(commitHash)
commitInfo := &types.LastCommitInfo{ Hash: hash, Message: "", When: commitTime, }
cacheMu.Lock() commitCache.Set(cacheKey, commitInfo, 1) cacheMu.Unlock()
return commitInfo, nil}
func newInfoWrapper( name string, prefix string, entry *object.TreeEntry, tree *object.Tree,) (*infoWrapper, error) { var ( size int64 mode fs.FileMode isDir bool )
if entry.Mode.IsFile() { file, err := tree.TreeEntryFile(entry) if err != nil { return nil, err } mode = fs.FileMode(file.Mode)
size, err = tree.Size(name) if err != nil { return nil, err } } else { isDir = true mode = fs.ModeDir | fs.ModePerm }
fullname := path.Join(prefix, name) return &infoWrapper{ name: fullname, size: size, mode: mode, modTime: time.Unix(0, 0), isDir: isDir, }, nil}
func (i *infoWrapper) Name() string { return i.name}
func (i *infoWrapper) Size() int64 { return i.size}
func (i *infoWrapper) Mode() fs.FileMode { return i.mode}
func (i *infoWrapper) ModTime() time.Time { return i.modTime}
func (i *infoWrapper) IsDir() bool { return i.isDir}
func (i *infoWrapper) Sys() any { return nil}
func (t *TagReference) Name() string { return t.ref.Name().Short()}
func (t *TagReference) Message() string { if t.tag != nil { return t.tag.Message } return ""}
func (t *TagReference) TagObject() *object.Tag { return t.tag}
func (t *TagReference) Hash() plumbing.Hash { return t.ref.Hash()}