switch to fork of go-git

vendor/github.com/jesseduffield/go-git/v5/storage/filesystem/config.go

@@ -0,0 +1,48 @@
+package filesystem
+
+import (
+	"os"
+
+	"github.com/jesseduffield/go-git/v5/config"
+	"github.com/jesseduffield/go-git/v5/storage/filesystem/dotgit"
+	"github.com/jesseduffield/go-git/v5/utils/ioutil"
+)
+
+type ConfigStorage struct {
+	dir *dotgit.DotGit
+}
+
+func (c *ConfigStorage) Config() (conf *config.Config, err error) {
+	f, err := c.dir.Config()
+	if err != nil {
+		if os.IsNotExist(err) {
+			return config.NewConfig(), nil
+		}
+
+		return nil, err
+	}
+
+	defer ioutil.CheckClose(f, &err)
+	return config.ReadConfig(f)
+}
+
+func (c *ConfigStorage) SetConfig(cfg *config.Config) (err error) {
+	if err = cfg.Validate(); err != nil {
+		return err
+	}
+
+	f, err := c.dir.ConfigWriter()
+	if err != nil {
+		return err
+	}
+
+	defer ioutil.CheckClose(f, &err)
+
+	b, err := cfg.Marshal()
+	if err != nil {
+		return err
+	}
+
+	_, err = f.Write(b)
+	return err
+}

vendor/github.com/jesseduffield/go-git/v5/storage/filesystem/deltaobject.go

@@ -0,0 +1,37 @@
+package filesystem
+
+import (
+	"github.com/jesseduffield/go-git/v5/plumbing"
+)
+
+type deltaObject struct {
+	plumbing.EncodedObject
+	base plumbing.Hash
+	hash plumbing.Hash
+	size int64
+}
+
+func newDeltaObject(
+	obj plumbing.EncodedObject,
+	hash plumbing.Hash,
+	base plumbing.Hash,
+	size int64) plumbing.DeltaObject {
+	return &deltaObject{
+		EncodedObject: obj,
+		hash:          hash,
+		base:          base,
+		size:          size,
+	}
+}
+
+func (o *deltaObject) BaseHash() plumbing.Hash {
+	return o.base
+}
+
+func (o *deltaObject) ActualSize() int64 {
+	return o.size
+}
+
+func (o *deltaObject) ActualHash() plumbing.Hash {
+	return o.hash
+}

vendor/github.com/jesseduffield/go-git/v5/storage/filesystem/dotgit/dotgit_rewrite_packed_refs.go

@@ -0,0 +1,81 @@
+package dotgit
+
+import (
+	"io"
+	"os"
+	"runtime"
+
+	"github.com/go-git/go-billy/v5"
+	"github.com/jesseduffield/go-git/v5/utils/ioutil"
+)
+
+func (d *DotGit) openAndLockPackedRefsMode() int {
+	if billy.CapabilityCheck(d.fs, billy.ReadAndWriteCapability) {
+		return os.O_RDWR
+	}
+
+	return os.O_RDONLY
+}
+
+func (d *DotGit) rewritePackedRefsWhileLocked(
+	tmp billy.File, pr billy.File) error {
+	// Try plain rename. If we aren't using the bare Windows filesystem as the
+	// storage layer, we might be able to get away with a rename over a locked
+	// file.
+	err := d.fs.Rename(tmp.Name(), pr.Name())
+	if err == nil {
+		return nil
+	}
+
+	// If we are in a filesystem that does not support rename (e.g. sivafs)
+	// a full copy is done.
+	if err == billy.ErrNotSupported {
+		return d.copyNewFile(tmp, pr)
+	}
+
+	if runtime.GOOS != "windows" {
+		return err
+	}
+
+	// Otherwise, Windows doesn't let us rename over a locked file, so
+	// we have to do a straight copy.  Unfortunately this could result
+	// in a partially-written file if the process fails before the
+	// copy completes.
+	return d.copyToExistingFile(tmp, pr)
+}
+
+func (d *DotGit) copyToExistingFile(tmp, pr billy.File) error {
+	_, err := pr.Seek(0, io.SeekStart)
+	if err != nil {
+		return err
+	}
+	err = pr.Truncate(0)
+	if err != nil {
+		return err
+	}
+	_, err = tmp.Seek(0, io.SeekStart)
+	if err != nil {
+		return err
+	}
+	_, err = io.Copy(pr, tmp)
+
+	return err
+}
+
+func (d *DotGit) copyNewFile(tmp billy.File, pr billy.File) (err error) {
+	prWrite, err := d.fs.Create(pr.Name())
+	if err != nil {
+		return err
+	}
+
+	defer ioutil.CheckClose(prWrite, &err)
+
+	_, err = tmp.Seek(0, io.SeekStart)
+	if err != nil {
+		return err
+	}
+
+	_, err = io.Copy(prWrite, tmp)
+
+	return err
+}

vendor/github.com/jesseduffield/go-git/v5/storage/filesystem/dotgit/dotgit_setref.go

@@ -0,0 +1,90 @@
+package dotgit
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/jesseduffield/go-git/v5/plumbing"
+	"github.com/jesseduffield/go-git/v5/utils/ioutil"
+
+	"github.com/go-git/go-billy/v5"
+)
+
+func (d *DotGit) setRef(fileName, content string, old *plumbing.Reference) (err error) {
+	if billy.CapabilityCheck(d.fs, billy.ReadAndWriteCapability) {
+		return d.setRefRwfs(fileName, content, old)
+	}
+
+	return d.setRefNorwfs(fileName, content, old)
+}
+
+func (d *DotGit) setRefRwfs(fileName, content string, old *plumbing.Reference) (err error) {
+	// If we are not checking an old ref, just truncate the file.
+	mode := os.O_RDWR | os.O_CREATE
+	if old == nil {
+		mode |= os.O_TRUNC
+	}
+
+	f, err := d.fs.OpenFile(fileName, mode, 0666)
+	if err != nil {
+		return err
+	}
+
+	defer ioutil.CheckClose(f, &err)
+
+	// Lock is unlocked by the deferred Close above. This is because Unlock
+	// does not imply a fsync and thus there would be a race between
+	// Unlock+Close and other concurrent writers. Adding Sync to go-billy
+	// could work, but this is better (and avoids superfluous syncs).
+	err = f.Lock()
+	if err != nil {
+		return err
+	}
+
+	// this is a no-op to call even when old is nil.
+	err = d.checkReferenceAndTruncate(f, old)
+	if err != nil {
+		return err
+	}
+
+	_, err = f.Write([]byte(content))
+	return err
+}
+
+// There are some filesystems that don't support opening files in RDWD mode.
+// In these filesystems the standard SetRef function can not be used as it
+// reads the reference file to check that it's not modified before updating it.
+//
+// This version of the function writes the reference without extra checks
+// making it compatible with these simple filesystems. This is usually not
+// a problem as they should be accessed by only one process at a time.
+func (d *DotGit) setRefNorwfs(fileName, content string, old *plumbing.Reference) error {
+	_, err := d.fs.Stat(fileName)
+	if err == nil && old != nil {
+		fRead, err := d.fs.Open(fileName)
+		if err != nil {
+			return err
+		}
+
+		ref, err := d.readReferenceFrom(fRead, old.Name().String())
+		fRead.Close()
+
+		if err != nil {
+			return err
+		}
+
+		if ref.Hash() != old.Hash() {
+			return fmt.Errorf("reference has changed concurrently")
+		}
+	}
+
+	f, err := d.fs.Create(fileName)
+	if err != nil {
+		return err
+	}
+
+	defer f.Close()
+
+	_, err = f.Write([]byte(content))
+	return err
+}

vendor/github.com/jesseduffield/go-git/v5/storage/filesystem/dotgit/repository_filesystem.go

@@ -0,0 +1,111 @@
+package dotgit
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/go-git/go-billy/v5"
+)
+
+// RepositoryFilesystem is a billy.Filesystem compatible object wrapper
+// which handles dot-git filesystem operations and supports commondir according to git scm layout:
+// https://github.com/git/git/blob/master/Documentation/gitrepository-layout.txt
+type RepositoryFilesystem struct {
+	dotGitFs       billy.Filesystem
+	commonDotGitFs billy.Filesystem
+}
+
+func NewRepositoryFilesystem(dotGitFs, commonDotGitFs billy.Filesystem) *RepositoryFilesystem {
+	return &RepositoryFilesystem{
+		dotGitFs:       dotGitFs,
+		commonDotGitFs: commonDotGitFs,
+	}
+}
+
+func (fs *RepositoryFilesystem) mapToRepositoryFsByPath(path string) billy.Filesystem {
+	// Nothing to decide if commondir not defined
+	if fs.commonDotGitFs == nil {
+		return fs.dotGitFs
+	}
+
+	cleanPath := filepath.Clean(path)
+
+	// Check exceptions for commondir (https://git-scm.com/docs/gitrepository-layout#Documentation/gitrepository-layout.txt)
+	switch cleanPath {
+	case fs.dotGitFs.Join(logsPath, "HEAD"):
+		return fs.dotGitFs
+	case fs.dotGitFs.Join(refsPath, "bisect"), fs.dotGitFs.Join(refsPath, "rewritten"), fs.dotGitFs.Join(refsPath, "worktree"):
+		return fs.dotGitFs
+	}
+
+	// Determine dot-git root by first path element.
+	// There are some elements which should always use commondir when commondir defined.
+	// Usual dot-git root will be used for the rest of files.
+	switch strings.Split(cleanPath, string(filepath.Separator))[0] {
+	case objectsPath, refsPath, packedRefsPath, configPath, branchesPath, hooksPath, infoPath, remotesPath, logsPath, shallowPath, worktreesPath:
+		return fs.commonDotGitFs
+	default:
+		return fs.dotGitFs
+	}
+}
+
+func (fs *RepositoryFilesystem) Create(filename string) (billy.File, error) {
+	return fs.mapToRepositoryFsByPath(filename).Create(filename)
+}
+
+func (fs *RepositoryFilesystem) Open(filename string) (billy.File, error) {
+	return fs.mapToRepositoryFsByPath(filename).Open(filename)
+}
+
+func (fs *RepositoryFilesystem) OpenFile(filename string, flag int, perm os.FileMode) (billy.File, error) {
+	return fs.mapToRepositoryFsByPath(filename).OpenFile(filename, flag, perm)
+}
+
+func (fs *RepositoryFilesystem) Stat(filename string) (os.FileInfo, error) {
+	return fs.mapToRepositoryFsByPath(filename).Stat(filename)
+}
+
+func (fs *RepositoryFilesystem) Rename(oldpath, newpath string) error {
+	return fs.mapToRepositoryFsByPath(oldpath).Rename(oldpath, newpath)
+}
+
+func (fs *RepositoryFilesystem) Remove(filename string) error {
+	return fs.mapToRepositoryFsByPath(filename).Remove(filename)
+}
+
+func (fs *RepositoryFilesystem) Join(elem ...string) string {
+	return fs.dotGitFs.Join(elem...)
+}
+
+func (fs *RepositoryFilesystem) TempFile(dir, prefix string) (billy.File, error) {
+	return fs.mapToRepositoryFsByPath(dir).TempFile(dir, prefix)
+}
+
+func (fs *RepositoryFilesystem) ReadDir(path string) ([]os.FileInfo, error) {
+	return fs.mapToRepositoryFsByPath(path).ReadDir(path)
+}
+
+func (fs *RepositoryFilesystem) MkdirAll(filename string, perm os.FileMode) error {
+	return fs.mapToRepositoryFsByPath(filename).MkdirAll(filename, perm)
+}
+
+func (fs *RepositoryFilesystem) Lstat(filename string) (os.FileInfo, error) {
+	return fs.mapToRepositoryFsByPath(filename).Lstat(filename)
+}
+
+func (fs *RepositoryFilesystem) Symlink(target, link string) error {
+	return fs.mapToRepositoryFsByPath(target).Symlink(target, link)
+}
+
+func (fs *RepositoryFilesystem) Readlink(link string) (string, error) {
+	return fs.mapToRepositoryFsByPath(link).Readlink(link)
+}
+
+func (fs *RepositoryFilesystem) Chroot(path string) (billy.Filesystem, error) {
+	return fs.mapToRepositoryFsByPath(path).Chroot(path)
+}
+
+func (fs *RepositoryFilesystem) Root() string {
+	return fs.dotGitFs.Root()
+}

vendor/github.com/jesseduffield/go-git/v5/storage/filesystem/dotgit/writers.go

@@ -0,0 +1,284 @@
+package dotgit
+
+import (
+	"fmt"
+	"io"
+	"sync/atomic"
+
+	"github.com/jesseduffield/go-git/v5/plumbing"
+	"github.com/jesseduffield/go-git/v5/plumbing/format/idxfile"
+	"github.com/jesseduffield/go-git/v5/plumbing/format/objfile"
+	"github.com/jesseduffield/go-git/v5/plumbing/format/packfile"
+
+	"github.com/go-git/go-billy/v5"
+)
+
+// PackWriter is a io.Writer that generates the packfile index simultaneously,
+// a packfile.Decoder is used with a file reader to read the file being written
+// this operation is synchronized with the write operations.
+// The packfile is written in a temp file, when Close is called this file
+// is renamed/moved (depends on the Filesystem implementation) to the final
+// location, if the PackWriter is not used, nothing is written
+type PackWriter struct {
+	Notify func(plumbing.Hash, *idxfile.Writer)
+
+	fs       billy.Filesystem
+	fr, fw   billy.File
+	synced   *syncedReader
+	checksum plumbing.Hash
+	parser   *packfile.Parser
+	writer   *idxfile.Writer
+	result   chan error
+}
+
+func newPackWrite(fs billy.Filesystem) (*PackWriter, error) {
+	fw, err := fs.TempFile(fs.Join(objectsPath, packPath), "tmp_pack_")
+	if err != nil {
+		return nil, err
+	}
+
+	fr, err := fs.Open(fw.Name())
+	if err != nil {
+		return nil, err
+	}
+
+	writer := &PackWriter{
+		fs:     fs,
+		fw:     fw,
+		fr:     fr,
+		synced: newSyncedReader(fw, fr),
+		result: make(chan error),
+	}
+
+	go writer.buildIndex()
+	return writer, nil
+}
+
+func (w *PackWriter) buildIndex() {
+	s := packfile.NewScanner(w.synced)
+	w.writer = new(idxfile.Writer)
+	var err error
+	w.parser, err = packfile.NewParser(s, w.writer)
+	if err != nil {
+		w.result <- err
+		return
+	}
+
+	checksum, err := w.parser.Parse()
+	if err != nil {
+		w.result <- err
+		return
+	}
+
+	w.checksum = checksum
+	w.result <- err
+}
+
+// waitBuildIndex waits until buildIndex function finishes, this can terminate
+// with a packfile.ErrEmptyPackfile, this means that nothing was written so we
+// ignore the error
+func (w *PackWriter) waitBuildIndex() error {
+	err := <-w.result
+	if err == packfile.ErrEmptyPackfile {
+		return nil
+	}
+
+	return err
+}
+
+func (w *PackWriter) Write(p []byte) (int, error) {
+	return w.synced.Write(p)
+}
+
+// Close closes all the file descriptors and save the final packfile, if nothing
+// was written, the tempfiles are deleted without writing a packfile.
+func (w *PackWriter) Close() error {
+	defer func() {
+		if w.Notify != nil && w.writer != nil && w.writer.Finished() {
+			w.Notify(w.checksum, w.writer)
+		}
+
+		close(w.result)
+	}()
+
+	if err := w.synced.Close(); err != nil {
+		return err
+	}
+
+	if err := w.waitBuildIndex(); err != nil {
+		return err
+	}
+
+	if err := w.fr.Close(); err != nil {
+		return err
+	}
+
+	if err := w.fw.Close(); err != nil {
+		return err
+	}
+
+	if w.writer == nil || !w.writer.Finished() {
+		return w.clean()
+	}
+
+	return w.save()
+}
+
+func (w *PackWriter) clean() error {
+	return w.fs.Remove(w.fw.Name())
+}
+
+func (w *PackWriter) save() error {
+	base := w.fs.Join(objectsPath, packPath, fmt.Sprintf("pack-%s", w.checksum))
+	idx, err := w.fs.Create(fmt.Sprintf("%s.idx", base))
+	if err != nil {
+		return err
+	}
+
+	if err := w.encodeIdx(idx); err != nil {
+		return err
+	}
+
+	if err := idx.Close(); err != nil {
+		return err
+	}
+
+	return w.fs.Rename(w.fw.Name(), fmt.Sprintf("%s.pack", base))
+}
+
+func (w *PackWriter) encodeIdx(writer io.Writer) error {
+	idx, err := w.writer.Index()
+	if err != nil {
+		return err
+	}
+
+	e := idxfile.NewEncoder(writer)
+	_, err = e.Encode(idx)
+	return err
+}
+
+type syncedReader struct {
+	w io.Writer
+	r io.ReadSeeker
+
+	blocked, done uint32
+	written, read uint64
+	news          chan bool
+}
+
+func newSyncedReader(w io.Writer, r io.ReadSeeker) *syncedReader {
+	return &syncedReader{
+		w:    w,
+		r:    r,
+		news: make(chan bool),
+	}
+}
+
+func (s *syncedReader) Write(p []byte) (n int, err error) {
+	defer func() {
+		written := atomic.AddUint64(&s.written, uint64(n))
+		read := atomic.LoadUint64(&s.read)
+		if written > read {
+			s.wake()
+		}
+	}()
+
+	n, err = s.w.Write(p)
+	return
+}
+
+func (s *syncedReader) Read(p []byte) (n int, err error) {
+	defer func() { atomic.AddUint64(&s.read, uint64(n)) }()
+
+	for {
+		s.sleep()
+		n, err = s.r.Read(p)
+		if err == io.EOF && !s.isDone() && n == 0 {
+			continue
+		}
+
+		break
+	}
+
+	return
+}
+
+func (s *syncedReader) isDone() bool {
+	return atomic.LoadUint32(&s.done) == 1
+}
+
+func (s *syncedReader) isBlocked() bool {
+	return atomic.LoadUint32(&s.blocked) == 1
+}
+
+func (s *syncedReader) wake() {
+	if s.isBlocked() {
+		atomic.StoreUint32(&s.blocked, 0)
+		s.news <- true
+	}
+}
+
+func (s *syncedReader) sleep() {
+	read := atomic.LoadUint64(&s.read)
+	written := atomic.LoadUint64(&s.written)
+	if read >= written {
+		atomic.StoreUint32(&s.blocked, 1)
+		<-s.news
+	}
+
+}
+
+func (s *syncedReader) Seek(offset int64, whence int) (int64, error) {
+	if whence == io.SeekCurrent {
+		return s.r.Seek(offset, whence)
+	}
+
+	p, err := s.r.Seek(offset, whence)
+	atomic.StoreUint64(&s.read, uint64(p))
+
+	return p, err
+}
+
+func (s *syncedReader) Close() error {
+	atomic.StoreUint32(&s.done, 1)
+	close(s.news)
+	return nil
+}
+
+type ObjectWriter struct {
+	objfile.Writer
+	fs billy.Filesystem
+	f  billy.File
+}
+
+func newObjectWriter(fs billy.Filesystem) (*ObjectWriter, error) {
+	f, err := fs.TempFile(fs.Join(objectsPath, packPath), "tmp_obj_")
+	if err != nil {
+		return nil, err
+	}
+
+	return &ObjectWriter{
+		Writer: (*objfile.NewWriter(f)),
+		fs:     fs,
+		f:      f,
+	}, nil
+}
+
+func (w *ObjectWriter) Close() error {
+	if err := w.Writer.Close(); err != nil {
+		return err
+	}
+
+	if err := w.f.Close(); err != nil {
+		return err
+	}
+
+	return w.save()
+}
+
+func (w *ObjectWriter) save() error {
+	hash := w.Hash().String()
+	file := w.fs.Join(objectsPath, hash[0:2], hash[2:40])
+
+	return w.fs.Rename(w.f.Name(), file)
+}

vendor/github.com/jesseduffield/go-git/v5/storage/filesystem/index.go

@@ -0,0 +1,54 @@
+package filesystem
+
+import (
+	"bufio"
+	"os"
+
+	"github.com/jesseduffield/go-git/v5/plumbing/format/index"
+	"github.com/jesseduffield/go-git/v5/storage/filesystem/dotgit"
+	"github.com/jesseduffield/go-git/v5/utils/ioutil"
+)
+
+type IndexStorage struct {
+	dir *dotgit.DotGit
+}
+
+func (s *IndexStorage) SetIndex(idx *index.Index) (err error) {
+	f, err := s.dir.IndexWriter()
+	if err != nil {
+		return err
+	}
+
+	defer ioutil.CheckClose(f, &err)
+	bw := bufio.NewWriter(f)
+	defer func() {
+		if e := bw.Flush(); err == nil && e != nil {
+			err = e
+		}
+	}()
+
+	e := index.NewEncoder(bw)
+	err = e.Encode(idx)
+	return err
+}
+
+func (s *IndexStorage) Index() (i *index.Index, err error) {
+	idx := &index.Index{
+		Version: 2,
+	}
+
+	f, err := s.dir.Index()
+	if err != nil {
+		if os.IsNotExist(err) {
+			return idx, nil
+		}
+
+		return nil, err
+	}
+
+	defer ioutil.CheckClose(f, &err)
+
+	d := index.NewDecoder(bufio.NewReader(f))
+	err = d.Decode(idx)
+	return idx, err
+}

vendor/github.com/jesseduffield/go-git/v5/storage/filesystem/module.go

@@ -0,0 +1,20 @@
+package filesystem
+
+import (
+	"github.com/jesseduffield/go-git/v5/plumbing/cache"
+	"github.com/jesseduffield/go-git/v5/storage"
+	"github.com/jesseduffield/go-git/v5/storage/filesystem/dotgit"
+)
+
+type ModuleStorage struct {
+	dir *dotgit.DotGit
+}
+
+func (s *ModuleStorage) Module(name string) (storage.Storer, error) {
+	fs, err := s.dir.Module(name)
+	if err != nil {
+		return nil, err
+	}
+
+	return NewStorage(fs, cache.NewObjectLRUDefault()), nil
+}

vendor/github.com/jesseduffield/go-git/v5/storage/filesystem/object.go

@@ -0,0 +1,848 @@
+package filesystem
+
+import (
+	"bytes"
+	"io"
+	"os"
+	"time"
+
+	"github.com/jesseduffield/go-git/v5/plumbing"
+	"github.com/jesseduffield/go-git/v5/plumbing/cache"
+	"github.com/jesseduffield/go-git/v5/plumbing/format/idxfile"
+	"github.com/jesseduffield/go-git/v5/plumbing/format/objfile"
+	"github.com/jesseduffield/go-git/v5/plumbing/format/packfile"
+	"github.com/jesseduffield/go-git/v5/plumbing/storer"
+	"github.com/jesseduffield/go-git/v5/storage/filesystem/dotgit"
+	"github.com/jesseduffield/go-git/v5/utils/ioutil"
+
+	"github.com/go-git/go-billy/v5"
+)
+
+type ObjectStorage struct {
+	options Options
+
+	// objectCache is an object cache uses to cache delta's bases and also recently
+	// loaded loose objects
+	objectCache cache.Object
+
+	dir   *dotgit.DotGit
+	index map[plumbing.Hash]idxfile.Index
+
+	packList    []plumbing.Hash
+	packListIdx int
+	packfiles   map[plumbing.Hash]*packfile.Packfile
+}
+
+// NewObjectStorage creates a new ObjectStorage with the given .git directory and cache.
+func NewObjectStorage(dir *dotgit.DotGit, objectCache cache.Object) *ObjectStorage {
+	return NewObjectStorageWithOptions(dir, objectCache, Options{})
+}
+
+// NewObjectStorageWithOptions creates a new ObjectStorage with the given .git directory, cache and extra options
+func NewObjectStorageWithOptions(dir *dotgit.DotGit, objectCache cache.Object, ops Options) *ObjectStorage {
+	return &ObjectStorage{
+		options:     ops,
+		objectCache: objectCache,
+		dir:         dir,
+	}
+}
+
+func (s *ObjectStorage) requireIndex() error {
+	if s.index != nil {
+		return nil
+	}
+
+	s.index = make(map[plumbing.Hash]idxfile.Index)
+	packs, err := s.dir.ObjectPacks()
+	if err != nil {
+		return err
+	}
+
+	for _, h := range packs {
+		if err := s.loadIdxFile(h); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// Reindex indexes again all packfiles. Useful if git changed packfiles externally
+func (s *ObjectStorage) Reindex() {
+	s.index = nil
+}
+
+func (s *ObjectStorage) loadIdxFile(h plumbing.Hash) (err error) {
+	f, err := s.dir.ObjectPackIdx(h)
+	if err != nil {
+		return err
+	}
+
+	defer ioutil.CheckClose(f, &err)
+
+	idxf := idxfile.NewMemoryIndex()
+	d := idxfile.NewDecoder(f)
+	if err = d.Decode(idxf); err != nil {
+		return err
+	}
+
+	s.index[h] = idxf
+	return err
+}
+
+func (s *ObjectStorage) NewEncodedObject() plumbing.EncodedObject {
+	return &plumbing.MemoryObject{}
+}
+
+func (s *ObjectStorage) PackfileWriter() (io.WriteCloser, error) {
+	if err := s.requireIndex(); err != nil {
+		return nil, err
+	}
+
+	w, err := s.dir.NewObjectPack()
+	if err != nil {
+		return nil, err
+	}
+
+	w.Notify = func(h plumbing.Hash, writer *idxfile.Writer) {
+		index, err := writer.Index()
+		if err == nil {
+			s.index[h] = index
+		}
+	}
+
+	return w, nil
+}
+
+// SetEncodedObject adds a new object to the storage.
+func (s *ObjectStorage) SetEncodedObject(o plumbing.EncodedObject) (h plumbing.Hash, err error) {
+	if o.Type() == plumbing.OFSDeltaObject || o.Type() == plumbing.REFDeltaObject {
+		return plumbing.ZeroHash, plumbing.ErrInvalidType
+	}
+
+	ow, err := s.dir.NewObject()
+	if err != nil {
+		return plumbing.ZeroHash, err
+	}
+
+	defer ioutil.CheckClose(ow, &err)
+
+	or, err := o.Reader()
+	if err != nil {
+		return plumbing.ZeroHash, err
+	}
+
+	defer ioutil.CheckClose(or, &err)
+
+	if err = ow.WriteHeader(o.Type(), o.Size()); err != nil {
+		return plumbing.ZeroHash, err
+	}
+
+	if _, err = io.Copy(ow, or); err != nil {
+		return plumbing.ZeroHash, err
+	}
+
+	return o.Hash(), err
+}
+
+// HasEncodedObject returns nil if the object exists, without actually
+// reading the object data from storage.
+func (s *ObjectStorage) HasEncodedObject(h plumbing.Hash) (err error) {
+	// Check unpacked objects
+	f, err := s.dir.Object(h)
+	if err != nil {
+		if !os.IsNotExist(err) {
+			return err
+		}
+		// Fall through to check packed objects.
+	} else {
+		defer ioutil.CheckClose(f, &err)
+		return nil
+	}
+
+	// Check packed objects.
+	if err := s.requireIndex(); err != nil {
+		return err
+	}
+	_, _, offset := s.findObjectInPackfile(h)
+	if offset == -1 {
+		return plumbing.ErrObjectNotFound
+	}
+	return nil
+}
+
+func (s *ObjectStorage) encodedObjectSizeFromUnpacked(h plumbing.Hash) (
+	size int64, err error) {
+	f, err := s.dir.Object(h)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return 0, plumbing.ErrObjectNotFound
+		}
+
+		return 0, err
+	}
+
+	r, err := objfile.NewReader(f)
+	if err != nil {
+		return 0, err
+	}
+	defer ioutil.CheckClose(r, &err)
+
+	_, size, err = r.Header()
+	return size, err
+}
+
+func (s *ObjectStorage) packfile(idx idxfile.Index, pack plumbing.Hash) (*packfile.Packfile, error) {
+	if p := s.packfileFromCache(pack); p != nil {
+		return p, nil
+	}
+
+	f, err := s.dir.ObjectPack(pack)
+	if err != nil {
+		return nil, err
+	}
+
+	var p *packfile.Packfile
+	if s.objectCache != nil {
+		p = packfile.NewPackfileWithCache(idx, s.dir.Fs(), f, s.objectCache)
+	} else {
+		p = packfile.NewPackfile(idx, s.dir.Fs(), f)
+	}
+
+	return p, s.storePackfileInCache(pack, p)
+}
+
+func (s *ObjectStorage) packfileFromCache(hash plumbing.Hash) *packfile.Packfile {
+	if s.packfiles == nil {
+		if s.options.KeepDescriptors {
+			s.packfiles = make(map[plumbing.Hash]*packfile.Packfile)
+		} else if s.options.MaxOpenDescriptors > 0 {
+			s.packList = make([]plumbing.Hash, s.options.MaxOpenDescriptors)
+			s.packfiles = make(map[plumbing.Hash]*packfile.Packfile, s.options.MaxOpenDescriptors)
+		}
+	}
+
+	return s.packfiles[hash]
+}
+
+func (s *ObjectStorage) storePackfileInCache(hash plumbing.Hash, p *packfile.Packfile) error {
+	if s.options.KeepDescriptors {
+		s.packfiles[hash] = p
+		return nil
+	}
+
+	if s.options.MaxOpenDescriptors <= 0 {
+		return nil
+	}
+
+	// start over as the limit of packList is hit
+	if s.packListIdx >= len(s.packList) {
+		s.packListIdx = 0
+	}
+
+	// close the existing packfile if open
+	if next := s.packList[s.packListIdx]; !next.IsZero() {
+		open := s.packfiles[next]
+		delete(s.packfiles, next)
+		if open != nil {
+			if err := open.Close(); err != nil {
+				return err
+			}
+		}
+	}
+
+	// cache newly open packfile
+	s.packList[s.packListIdx] = hash
+	s.packfiles[hash] = p
+	s.packListIdx++
+
+	return nil
+}
+
+func (s *ObjectStorage) encodedObjectSizeFromPackfile(h plumbing.Hash) (
+	size int64, err error) {
+	if err := s.requireIndex(); err != nil {
+		return 0, err
+	}
+
+	pack, _, offset := s.findObjectInPackfile(h)
+	if offset == -1 {
+		return 0, plumbing.ErrObjectNotFound
+	}
+
+	idx := s.index[pack]
+	hash, err := idx.FindHash(offset)
+	if err == nil {
+		obj, ok := s.objectCache.Get(hash)
+		if ok {
+			return obj.Size(), nil
+		}
+	} else if err != nil && err != plumbing.ErrObjectNotFound {
+		return 0, err
+	}
+
+	p, err := s.packfile(idx, pack)
+	if err != nil {
+		return 0, err
+	}
+
+	if !s.options.KeepDescriptors && s.options.MaxOpenDescriptors == 0 {
+		defer ioutil.CheckClose(p, &err)
+	}
+
+	return p.GetSizeByOffset(offset)
+}
+
+// EncodedObjectSize returns the plaintext size of the given object,
+// without actually reading the full object data from storage.
+func (s *ObjectStorage) EncodedObjectSize(h plumbing.Hash) (
+	size int64, err error) {
+	size, err = s.encodedObjectSizeFromUnpacked(h)
+	if err != nil && err != plumbing.ErrObjectNotFound {
+		return 0, err
+	} else if err == nil {
+		return size, nil
+	}
+
+	return s.encodedObjectSizeFromPackfile(h)
+}
+
+// EncodedObject returns the object with the given hash, by searching for it in
+// the packfile and the git object directories.
+func (s *ObjectStorage) EncodedObject(t plumbing.ObjectType, h plumbing.Hash) (plumbing.EncodedObject, error) {
+	var obj plumbing.EncodedObject
+	var err error
+
+	if s.index != nil {
+		obj, err = s.getFromPackfile(h, false)
+		if err == plumbing.ErrObjectNotFound {
+			obj, err = s.getFromUnpacked(h)
+		}
+	} else {
+		obj, err = s.getFromUnpacked(h)
+		if err == plumbing.ErrObjectNotFound {
+			obj, err = s.getFromPackfile(h, false)
+		}
+	}
+
+	// If the error is still object not found, check if it's a shared object
+	// repository.
+	if err == plumbing.ErrObjectNotFound {
+		dotgits, e := s.dir.Alternates()
+		if e == nil {
+			// Create a new object storage with the DotGit(s) and check for the
+			// required hash object. Skip when not found.
+			for _, dg := range dotgits {
+				o := NewObjectStorage(dg, s.objectCache)
+				enobj, enerr := o.EncodedObject(t, h)
+				if enerr != nil {
+					continue
+				}
+				return enobj, nil
+			}
+		}
+	}
+
+	if err != nil {
+		return nil, err
+	}
+
+	if plumbing.AnyObject != t && obj.Type() != t {
+		return nil, plumbing.ErrObjectNotFound
+	}
+
+	return obj, nil
+}
+
+// DeltaObject returns the object with the given hash, by searching for
+// it in the packfile and the git object directories.
+func (s *ObjectStorage) DeltaObject(t plumbing.ObjectType,
+	h plumbing.Hash) (plumbing.EncodedObject, error) {
+	obj, err := s.getFromUnpacked(h)
+	if err == plumbing.ErrObjectNotFound {
+		obj, err = s.getFromPackfile(h, true)
+	}
+
+	if err != nil {
+		return nil, err
+	}
+
+	if plumbing.AnyObject != t && obj.Type() != t {
+		return nil, plumbing.ErrObjectNotFound
+	}
+
+	return obj, nil
+}
+
+func (s *ObjectStorage) getFromUnpacked(h plumbing.Hash) (obj plumbing.EncodedObject, err error) {
+	f, err := s.dir.Object(h)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return nil, plumbing.ErrObjectNotFound
+		}
+
+		return nil, err
+	}
+	defer ioutil.CheckClose(f, &err)
+
+	if cacheObj, found := s.objectCache.Get(h); found {
+		return cacheObj, nil
+	}
+
+	obj = s.NewEncodedObject()
+	r, err := objfile.NewReader(f)
+	if err != nil {
+		return nil, err
+	}
+
+	defer ioutil.CheckClose(r, &err)
+
+	t, size, err := r.Header()
+	if err != nil {
+		return nil, err
+	}
+
+	obj.SetType(t)
+	obj.SetSize(size)
+	w, err := obj.Writer()
+	if err != nil {
+		return nil, err
+	}
+
+	defer ioutil.CheckClose(w, &err)
+
+	s.objectCache.Put(obj)
+
+	_, err = io.Copy(w, r)
+	return obj, err
+}
+
+// Get returns the object with the given hash, by searching for it in
+// the packfile.
+func (s *ObjectStorage) getFromPackfile(h plumbing.Hash, canBeDelta bool) (
+	plumbing.EncodedObject, error) {
+
+	if err := s.requireIndex(); err != nil {
+		return nil, err
+	}
+
+	pack, hash, offset := s.findObjectInPackfile(h)
+	if offset == -1 {
+		return nil, plumbing.ErrObjectNotFound
+	}
+
+	idx := s.index[pack]
+	p, err := s.packfile(idx, pack)
+	if err != nil {
+		return nil, err
+	}
+
+	if !s.options.KeepDescriptors && s.options.MaxOpenDescriptors == 0 {
+		defer ioutil.CheckClose(p, &err)
+	}
+
+	if canBeDelta {
+		return s.decodeDeltaObjectAt(p, offset, hash)
+	}
+
+	return s.decodeObjectAt(p, offset)
+}
+
+func (s *ObjectStorage) decodeObjectAt(
+	p *packfile.Packfile,
+	offset int64,
+) (plumbing.EncodedObject, error) {
+	hash, err := p.FindHash(offset)
+	if err == nil {
+		obj, ok := s.objectCache.Get(hash)
+		if ok {
+			return obj, nil
+		}
+	}
+
+	if err != nil && err != plumbing.ErrObjectNotFound {
+		return nil, err
+	}
+
+	return p.GetByOffset(offset)
+}
+
+func (s *ObjectStorage) decodeDeltaObjectAt(
+	p *packfile.Packfile,
+	offset int64,
+	hash plumbing.Hash,
+) (plumbing.EncodedObject, error) {
+	scan := p.Scanner()
+	header, err := scan.SeekObjectHeader(offset)
+	if err != nil {
+		return nil, err
+	}
+
+	var (
+		base plumbing.Hash
+	)
+
+	switch header.Type {
+	case plumbing.REFDeltaObject:
+		base = header.Reference
+	case plumbing.OFSDeltaObject:
+		base, err = p.FindHash(header.OffsetReference)
+		if err != nil {
+			return nil, err
+		}
+	default:
+		return s.decodeObjectAt(p, offset)
+	}
+
+	obj := &plumbing.MemoryObject{}
+	obj.SetType(header.Type)
+	w, err := obj.Writer()
+	if err != nil {
+		return nil, err
+	}
+
+	if _, _, err := scan.NextObject(w); err != nil {
+		return nil, err
+	}
+
+	return newDeltaObject(obj, hash, base, header.Length), nil
+}
+
+func (s *ObjectStorage) findObjectInPackfile(h plumbing.Hash) (plumbing.Hash, plumbing.Hash, int64) {
+	for packfile, index := range s.index {
+		offset, err := index.FindOffset(h)
+		if err == nil {
+			return packfile, h, offset
+		}
+	}
+
+	return plumbing.ZeroHash, plumbing.ZeroHash, -1
+}
+
+func (s *ObjectStorage) HashesWithPrefix(prefix []byte) ([]plumbing.Hash, error) {
+	hashes, err := s.dir.ObjectsWithPrefix(prefix)
+	if err != nil {
+		return nil, err
+	}
+
+	// TODO: This could be faster with some idxfile changes,
+	// or diving into the packfile.
+	for _, index := range s.index {
+		ei, err := index.Entries()
+		if err != nil {
+			return nil, err
+		}
+		for {
+			e, err := ei.Next()
+			if err == io.EOF {
+				break
+			} else if err != nil {
+				return nil, err
+			}
+			if bytes.HasPrefix(e.Hash[:], prefix) {
+				hashes = append(hashes, e.Hash)
+			}
+		}
+		ei.Close()
+	}
+
+	return hashes, nil
+}
+
+// IterEncodedObjects returns an iterator for all the objects in the packfile
+// with the given type.
+func (s *ObjectStorage) IterEncodedObjects(t plumbing.ObjectType) (storer.EncodedObjectIter, error) {
+	objects, err := s.dir.Objects()
+	if err != nil {
+		return nil, err
+	}
+
+	seen := make(map[plumbing.Hash]struct{})
+	var iters []storer.EncodedObjectIter
+	if len(objects) != 0 {
+		iters = append(iters, &objectsIter{s: s, t: t, h: objects})
+		seen = hashListAsMap(objects)
+	}
+
+	packi, err := s.buildPackfileIters(t, seen)
+	if err != nil {
+		return nil, err
+	}
+
+	iters = append(iters, packi)
+	return storer.NewMultiEncodedObjectIter(iters), nil
+}
+
+func (s *ObjectStorage) buildPackfileIters(
+	t plumbing.ObjectType,
+	seen map[plumbing.Hash]struct{},
+) (storer.EncodedObjectIter, error) {
+	if err := s.requireIndex(); err != nil {
+		return nil, err
+	}
+
+	packs, err := s.dir.ObjectPacks()
+	if err != nil {
+		return nil, err
+	}
+	return &lazyPackfilesIter{
+		hashes: packs,
+		open: func(h plumbing.Hash) (storer.EncodedObjectIter, error) {
+			pack, err := s.dir.ObjectPack(h)
+			if err != nil {
+				return nil, err
+			}
+			return newPackfileIter(
+				s.dir.Fs(), pack, t, seen, s.index[h],
+				s.objectCache, s.options.KeepDescriptors,
+			)
+		},
+	}, nil
+}
+
+// Close closes all opened files.
+func (s *ObjectStorage) Close() error {
+	var firstError error
+	if s.options.KeepDescriptors || s.options.MaxOpenDescriptors > 0 {
+		for _, packfile := range s.packfiles {
+			err := packfile.Close()
+			if firstError == nil && err != nil {
+				firstError = err
+			}
+		}
+	}
+
+	s.packfiles = nil
+	s.dir.Close()
+
+	return firstError
+}
+
+type lazyPackfilesIter struct {
+	hashes []plumbing.Hash
+	open   func(h plumbing.Hash) (storer.EncodedObjectIter, error)
+	cur    storer.EncodedObjectIter
+}
+
+func (it *lazyPackfilesIter) Next() (plumbing.EncodedObject, error) {
+	for {
+		if it.cur == nil {
+			if len(it.hashes) == 0 {
+				return nil, io.EOF
+			}
+			h := it.hashes[0]
+			it.hashes = it.hashes[1:]
+
+			sub, err := it.open(h)
+			if err == io.EOF {
+				continue
+			} else if err != nil {
+				return nil, err
+			}
+			it.cur = sub
+		}
+		ob, err := it.cur.Next()
+		if err == io.EOF {
+			it.cur.Close()
+			it.cur = nil
+			continue
+		} else if err != nil {
+			return nil, err
+		}
+		return ob, nil
+	}
+}
+
+func (it *lazyPackfilesIter) ForEach(cb func(plumbing.EncodedObject) error) error {
+	return storer.ForEachIterator(it, cb)
+}
+
+func (it *lazyPackfilesIter) Close() {
+	if it.cur != nil {
+		it.cur.Close()
+		it.cur = nil
+	}
+	it.hashes = nil
+}
+
+type packfileIter struct {
+	pack billy.File
+	iter storer.EncodedObjectIter
+	seen map[plumbing.Hash]struct{}
+
+	// tells whether the pack file should be left open after iteration or not
+	keepPack bool
+}
+
+// NewPackfileIter returns a new EncodedObjectIter for the provided packfile
+// and object type. Packfile and index file will be closed after they're
+// used. If keepPack is true the packfile won't be closed after the iteration
+// finished.
+func NewPackfileIter(
+	fs billy.Filesystem,
+	f billy.File,
+	idxFile billy.File,
+	t plumbing.ObjectType,
+	keepPack bool,
+) (storer.EncodedObjectIter, error) {
+	idx := idxfile.NewMemoryIndex()
+	if err := idxfile.NewDecoder(idxFile).Decode(idx); err != nil {
+		return nil, err
+	}
+
+	if err := idxFile.Close(); err != nil {
+		return nil, err
+	}
+
+	seen := make(map[plumbing.Hash]struct{})
+	return newPackfileIter(fs, f, t, seen, idx, nil, keepPack)
+}
+
+func newPackfileIter(
+	fs billy.Filesystem,
+	f billy.File,
+	t plumbing.ObjectType,
+	seen map[plumbing.Hash]struct{},
+	index idxfile.Index,
+	cache cache.Object,
+	keepPack bool,
+) (storer.EncodedObjectIter, error) {
+	var p *packfile.Packfile
+	if cache != nil {
+		p = packfile.NewPackfileWithCache(index, fs, f, cache)
+	} else {
+		p = packfile.NewPackfile(index, fs, f)
+	}
+
+	iter, err := p.GetByType(t)
+	if err != nil {
+		return nil, err
+	}
+
+	return &packfileIter{
+		pack:     f,
+		iter:     iter,
+		seen:     seen,
+		keepPack: keepPack,
+	}, nil
+}
+
+func (iter *packfileIter) Next() (plumbing.EncodedObject, error) {
+	for {
+		obj, err := iter.iter.Next()
+		if err != nil {
+			return nil, err
+		}
+
+		if _, ok := iter.seen[obj.Hash()]; ok {
+			continue
+		}
+
+		return obj, nil
+	}
+}
+
+func (iter *packfileIter) ForEach(cb func(plumbing.EncodedObject) error) error {
+	for {
+		o, err := iter.Next()
+		if err != nil {
+			if err == io.EOF {
+				iter.Close()
+				return nil
+			}
+			return err
+		}
+
+		if err := cb(o); err != nil {
+			return err
+		}
+	}
+}
+
+func (iter *packfileIter) Close() {
+	iter.iter.Close()
+	if !iter.keepPack {
+		_ = iter.pack.Close()
+	}
+}
+
+type objectsIter struct {
+	s *ObjectStorage
+	t plumbing.ObjectType
+	h []plumbing.Hash
+}
+
+func (iter *objectsIter) Next() (plumbing.EncodedObject, error) {
+	if len(iter.h) == 0 {
+		return nil, io.EOF
+	}
+
+	obj, err := iter.s.getFromUnpacked(iter.h[0])
+	iter.h = iter.h[1:]
+
+	if err != nil {
+		return nil, err
+	}
+
+	if iter.t != plumbing.AnyObject && iter.t != obj.Type() {
+		return iter.Next()
+	}
+
+	return obj, err
+}
+
+func (iter *objectsIter) ForEach(cb func(plumbing.EncodedObject) error) error {
+	for {
+		o, err := iter.Next()
+		if err != nil {
+			if err == io.EOF {
+				return nil
+			}
+			return err
+		}
+
+		if err := cb(o); err != nil {
+			return err
+		}
+	}
+}
+
+func (iter *objectsIter) Close() {
+	iter.h = []plumbing.Hash{}
+}
+
+func hashListAsMap(l []plumbing.Hash) map[plumbing.Hash]struct{} {
+	m := make(map[plumbing.Hash]struct{}, len(l))
+	for _, h := range l {
+		m[h] = struct{}{}
+	}
+	return m
+}
+
+func (s *ObjectStorage) ForEachObjectHash(fun func(plumbing.Hash) error) error {
+	err := s.dir.ForEachObjectHash(fun)
+	if err == storer.ErrStop {
+		return nil
+	}
+	return err
+}
+
+func (s *ObjectStorage) LooseObjectTime(hash plumbing.Hash) (time.Time, error) {
+	fi, err := s.dir.ObjectStat(hash)
+	if err != nil {
+		return time.Time{}, err
+	}
+	return fi.ModTime(), nil
+}
+
+func (s *ObjectStorage) DeleteLooseObject(hash plumbing.Hash) error {
+	return s.dir.ObjectDelete(hash)
+}
+
+func (s *ObjectStorage) ObjectPacks() ([]plumbing.Hash, error) {
+	return s.dir.ObjectPacks()
+}
+
+func (s *ObjectStorage) DeleteOldObjectPackAndIndex(h plumbing.Hash, t time.Time) error {
+	return s.dir.DeleteOldObjectPackAndIndex(h, t)
+}

vendor/github.com/jesseduffield/go-git/v5/storage/filesystem/reference.go

@@ -0,0 +1,44 @@
+package filesystem
+
+import (
+	"github.com/jesseduffield/go-git/v5/plumbing"
+	"github.com/jesseduffield/go-git/v5/plumbing/storer"
+	"github.com/jesseduffield/go-git/v5/storage/filesystem/dotgit"
+)
+
+type ReferenceStorage struct {
+	dir *dotgit.DotGit
+}
+
+func (r *ReferenceStorage) SetReference(ref *plumbing.Reference) error {
+	return r.dir.SetRef(ref, nil)
+}
+
+func (r *ReferenceStorage) CheckAndSetReference(ref, old *plumbing.Reference) error {
+	return r.dir.SetRef(ref, old)
+}
+
+func (r *ReferenceStorage) Reference(n plumbing.ReferenceName) (*plumbing.Reference, error) {
+	return r.dir.Ref(n)
+}
+
+func (r *ReferenceStorage) IterReferences() (storer.ReferenceIter, error) {
+	refs, err := r.dir.Refs()
+	if err != nil {
+		return nil, err
+	}
+
+	return storer.NewReferenceSliceIter(refs), nil
+}
+
+func (r *ReferenceStorage) RemoveReference(n plumbing.ReferenceName) error {
+	return r.dir.RemoveRef(n)
+}
+
+func (r *ReferenceStorage) CountLooseRefs() (int, error) {
+	return r.dir.CountLooseRefs()
+}
+
+func (r *ReferenceStorage) PackRefs() error {
+	return r.dir.PackRefs()
+}

vendor/github.com/jesseduffield/go-git/v5/storage/filesystem/shallow.go

@@ -0,0 +1,54 @@
+package filesystem
+
+import (
+	"bufio"
+	"fmt"
+
+	"github.com/jesseduffield/go-git/v5/plumbing"
+	"github.com/jesseduffield/go-git/v5/storage/filesystem/dotgit"
+	"github.com/jesseduffield/go-git/v5/utils/ioutil"
+)
+
+// ShallowStorage where the shallow commits are stored, an internal to
+// manipulate the shallow file
+type ShallowStorage struct {
+	dir *dotgit.DotGit
+}
+
+// SetShallow save the shallows in the shallow file in the .git folder as one
+// commit per line represented by 40-byte hexadecimal object terminated by a
+// newline.
+func (s *ShallowStorage) SetShallow(commits []plumbing.Hash) error {
+	f, err := s.dir.ShallowWriter()
+	if err != nil {
+		return err
+	}
+
+	defer ioutil.CheckClose(f, &err)
+	for _, h := range commits {
+		if _, err := fmt.Fprintf(f, "%s\n", h); err != nil {
+			return err
+		}
+	}
+
+	return err
+}
+
+// Shallow return the shallow commits reading from shallo file from .git
+func (s *ShallowStorage) Shallow() ([]plumbing.Hash, error) {
+	f, err := s.dir.Shallow()
+	if f == nil || err != nil {
+		return nil, err
+	}
+
+	defer ioutil.CheckClose(f, &err)
+
+	var hash []plumbing.Hash
+
+	scn := bufio.NewScanner(f)
+	for scn.Scan() {
+		hash = append(hash, plumbing.NewHash(scn.Text()))
+	}
+
+	return hash, scn.Err()
+}

vendor/github.com/jesseduffield/go-git/v5/storage/filesystem/storage.go

@@ -0,0 +1,73 @@
+// Package filesystem is a storage backend base on filesystems
+package filesystem
+
+import (
+	"github.com/jesseduffield/go-git/v5/plumbing/cache"
+	"github.com/jesseduffield/go-git/v5/storage/filesystem/dotgit"
+
+	"github.com/go-git/go-billy/v5"
+)
+
+// Storage is an implementation of git.Storer that stores data on disk in the
+// standard git format (this is, the .git directory). Zero values of this type
+// are not safe to use, see the NewStorage function below.
+type Storage struct {
+	fs  billy.Filesystem
+	dir *dotgit.DotGit
+
+	ObjectStorage
+	ReferenceStorage
+	IndexStorage
+	ShallowStorage
+	ConfigStorage
+	ModuleStorage
+}
+
+// Options holds configuration for the storage.
+type Options struct {
+	// ExclusiveAccess means that the filesystem is not modified externally
+	// while the repo is open.
+	ExclusiveAccess bool
+	// KeepDescriptors makes the file descriptors to be reused but they will
+	// need to be manually closed calling Close().
+	KeepDescriptors bool
+	// MaxOpenDescriptors is the max number of file descriptors to keep
+	// open. If KeepDescriptors is true, all file descriptors will remain open.
+	MaxOpenDescriptors int
+}
+
+// NewStorage returns a new Storage backed by a given `fs.Filesystem` and cache.
+func NewStorage(fs billy.Filesystem, cache cache.Object) *Storage {
+	return NewStorageWithOptions(fs, cache, Options{})
+}
+
+// NewStorageWithOptions returns a new Storage with extra options,
+// backed by a given `fs.Filesystem` and cache.
+func NewStorageWithOptions(fs billy.Filesystem, cache cache.Object, ops Options) *Storage {
+	dirOps := dotgit.Options{
+		ExclusiveAccess: ops.ExclusiveAccess,
+	}
+	dir := dotgit.NewWithOptions(fs, dirOps)
+
+	return &Storage{
+		fs:  fs,
+		dir: dir,
+
+		ObjectStorage:    *NewObjectStorageWithOptions(dir, cache, ops),
+		ReferenceStorage: ReferenceStorage{dir: dir},
+		IndexStorage:     IndexStorage{dir: dir},
+		ShallowStorage:   ShallowStorage{dir: dir},
+		ConfigStorage:    ConfigStorage{dir: dir},
+		ModuleStorage:    ModuleStorage{dir: dir},
+	}
+}
+
+// Filesystem returns the underlying filesystem
+func (s *Storage) Filesystem() billy.Filesystem {
+	return s.fs
+}
+
+// Init initializes .git directory
+func (s *Storage) Init() error {
+	return s.dir.Initialize()
+}

vendor/github.com/jesseduffield/go-git/v5/storage/memory/storage.go

@@ -0,0 +1,320 @@
+// Package memory is a storage backend base on memory
+package memory
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/jesseduffield/go-git/v5/config"
+	"github.com/jesseduffield/go-git/v5/plumbing"
+	"github.com/jesseduffield/go-git/v5/plumbing/format/index"
+	"github.com/jesseduffield/go-git/v5/plumbing/storer"
+	"github.com/jesseduffield/go-git/v5/storage"
+)
+
+var ErrUnsupportedObjectType = fmt.Errorf("unsupported object type")
+
+// Storage is an implementation of git.Storer that stores data on memory, being
+// ephemeral. The use of this storage should be done in controlled environments,
+// since the representation in memory of some repository can fill the machine
+// memory. in the other hand this storage has the best performance.
+type Storage struct {
+	ConfigStorage
+	ObjectStorage
+	ShallowStorage
+	IndexStorage
+	ReferenceStorage
+	ModuleStorage
+}
+
+// NewStorage returns a new Storage base on memory
+func NewStorage() *Storage {
+	return &Storage{
+		ReferenceStorage: make(ReferenceStorage),
+		ConfigStorage:    ConfigStorage{},
+		ShallowStorage:   ShallowStorage{},
+		ObjectStorage: ObjectStorage{
+			Objects: make(map[plumbing.Hash]plumbing.EncodedObject),
+			Commits: make(map[plumbing.Hash]plumbing.EncodedObject),
+			Trees:   make(map[plumbing.Hash]plumbing.EncodedObject),
+			Blobs:   make(map[plumbing.Hash]plumbing.EncodedObject),
+			Tags:    make(map[plumbing.Hash]plumbing.EncodedObject),
+		},
+		ModuleStorage: make(ModuleStorage),
+	}
+}
+
+type ConfigStorage struct {
+	config *config.Config
+}
+
+func (c *ConfigStorage) SetConfig(cfg *config.Config) error {
+	if err := cfg.Validate(); err != nil {
+		return err
+	}
+
+	c.config = cfg
+	return nil
+}
+
+func (c *ConfigStorage) Config() (*config.Config, error) {
+	if c.config == nil {
+		c.config = config.NewConfig()
+	}
+
+	return c.config, nil
+}
+
+type IndexStorage struct {
+	index *index.Index
+}
+
+func (c *IndexStorage) SetIndex(idx *index.Index) error {
+	c.index = idx
+	return nil
+}
+
+func (c *IndexStorage) Index() (*index.Index, error) {
+	if c.index == nil {
+		c.index = &index.Index{Version: 2}
+	}
+
+	return c.index, nil
+}
+
+type ObjectStorage struct {
+	Objects map[plumbing.Hash]plumbing.EncodedObject
+	Commits map[plumbing.Hash]plumbing.EncodedObject
+	Trees   map[plumbing.Hash]plumbing.EncodedObject
+	Blobs   map[plumbing.Hash]plumbing.EncodedObject
+	Tags    map[plumbing.Hash]plumbing.EncodedObject
+}
+
+func (o *ObjectStorage) NewEncodedObject() plumbing.EncodedObject {
+	return &plumbing.MemoryObject{}
+}
+
+func (o *ObjectStorage) SetEncodedObject(obj plumbing.EncodedObject) (plumbing.Hash, error) {
+	h := obj.Hash()
+	o.Objects[h] = obj
+
+	switch obj.Type() {
+	case plumbing.CommitObject:
+		o.Commits[h] = o.Objects[h]
+	case plumbing.TreeObject:
+		o.Trees[h] = o.Objects[h]
+	case plumbing.BlobObject:
+		o.Blobs[h] = o.Objects[h]
+	case plumbing.TagObject:
+		o.Tags[h] = o.Objects[h]
+	default:
+		return h, ErrUnsupportedObjectType
+	}
+
+	return h, nil
+}
+
+func (o *ObjectStorage) HasEncodedObject(h plumbing.Hash) (err error) {
+	if _, ok := o.Objects[h]; !ok {
+		return plumbing.ErrObjectNotFound
+	}
+	return nil
+}
+
+func (o *ObjectStorage) EncodedObjectSize(h plumbing.Hash) (
+	size int64, err error) {
+	obj, ok := o.Objects[h]
+	if !ok {
+		return 0, plumbing.ErrObjectNotFound
+	}
+
+	return obj.Size(), nil
+}
+
+func (o *ObjectStorage) EncodedObject(t plumbing.ObjectType, h plumbing.Hash) (plumbing.EncodedObject, error) {
+	obj, ok := o.Objects[h]
+	if !ok || (plumbing.AnyObject != t && obj.Type() != t) {
+		return nil, plumbing.ErrObjectNotFound
+	}
+
+	return obj, nil
+}
+
+func (o *ObjectStorage) IterEncodedObjects(t plumbing.ObjectType) (storer.EncodedObjectIter, error) {
+	var series []plumbing.EncodedObject
+	switch t {
+	case plumbing.AnyObject:
+		series = flattenObjectMap(o.Objects)
+	case plumbing.CommitObject:
+		series = flattenObjectMap(o.Commits)
+	case plumbing.TreeObject:
+		series = flattenObjectMap(o.Trees)
+	case plumbing.BlobObject:
+		series = flattenObjectMap(o.Blobs)
+	case plumbing.TagObject:
+		series = flattenObjectMap(o.Tags)
+	}
+
+	return storer.NewEncodedObjectSliceIter(series), nil
+}
+
+func flattenObjectMap(m map[plumbing.Hash]plumbing.EncodedObject) []plumbing.EncodedObject {
+	objects := make([]plumbing.EncodedObject, 0, len(m))
+	for _, obj := range m {
+		objects = append(objects, obj)
+	}
+	return objects
+}
+
+func (o *ObjectStorage) Begin() storer.Transaction {
+	return &TxObjectStorage{
+		Storage: o,
+		Objects: make(map[plumbing.Hash]plumbing.EncodedObject),
+	}
+}
+
+func (o *ObjectStorage) ForEachObjectHash(fun func(plumbing.Hash) error) error {
+	for h := range o.Objects {
+		err := fun(h)
+		if err != nil {
+			if err == storer.ErrStop {
+				return nil
+			}
+			return err
+		}
+	}
+	return nil
+}
+
+func (o *ObjectStorage) ObjectPacks() ([]plumbing.Hash, error) {
+	return nil, nil
+}
+func (o *ObjectStorage) DeleteOldObjectPackAndIndex(plumbing.Hash, time.Time) error {
+	return nil
+}
+
+var errNotSupported = fmt.Errorf("Not supported")
+
+func (o *ObjectStorage) LooseObjectTime(hash plumbing.Hash) (time.Time, error) {
+	return time.Time{}, errNotSupported
+}
+func (o *ObjectStorage) DeleteLooseObject(plumbing.Hash) error {
+	return errNotSupported
+}
+
+type TxObjectStorage struct {
+	Storage *ObjectStorage
+	Objects map[plumbing.Hash]plumbing.EncodedObject
+}
+
+func (tx *TxObjectStorage) SetEncodedObject(obj plumbing.EncodedObject) (plumbing.Hash, error) {
+	h := obj.Hash()
+	tx.Objects[h] = obj
+
+	return h, nil
+}
+
+func (tx *TxObjectStorage) EncodedObject(t plumbing.ObjectType, h plumbing.Hash) (plumbing.EncodedObject, error) {
+	obj, ok := tx.Objects[h]
+	if !ok || (plumbing.AnyObject != t && obj.Type() != t) {
+		return nil, plumbing.ErrObjectNotFound
+	}
+
+	return obj, nil
+}
+
+func (tx *TxObjectStorage) Commit() error {
+	for h, obj := range tx.Objects {
+		delete(tx.Objects, h)
+		if _, err := tx.Storage.SetEncodedObject(obj); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (tx *TxObjectStorage) Rollback() error {
+	tx.Objects = make(map[plumbing.Hash]plumbing.EncodedObject)
+	return nil
+}
+
+type ReferenceStorage map[plumbing.ReferenceName]*plumbing.Reference
+
+func (r ReferenceStorage) SetReference(ref *plumbing.Reference) error {
+	if ref != nil {
+		r[ref.Name()] = ref
+	}
+
+	return nil
+}
+
+func (r ReferenceStorage) CheckAndSetReference(ref, old *plumbing.Reference) error {
+	if ref == nil {
+		return nil
+	}
+
+	if old != nil {
+		tmp := r[ref.Name()]
+		if tmp != nil && tmp.Hash() != old.Hash() {
+			return storage.ErrReferenceHasChanged
+		}
+	}
+	r[ref.Name()] = ref
+	return nil
+}
+
+func (r ReferenceStorage) Reference(n plumbing.ReferenceName) (*plumbing.Reference, error) {
+	ref, ok := r[n]
+	if !ok {
+		return nil, plumbing.ErrReferenceNotFound
+	}
+
+	return ref, nil
+}
+
+func (r ReferenceStorage) IterReferences() (storer.ReferenceIter, error) {
+	var refs []*plumbing.Reference
+	for _, ref := range r {
+		refs = append(refs, ref)
+	}
+
+	return storer.NewReferenceSliceIter(refs), nil
+}
+
+func (r ReferenceStorage) CountLooseRefs() (int, error) {
+	return len(r), nil
+}
+
+func (r ReferenceStorage) PackRefs() error {
+	return nil
+}
+
+func (r ReferenceStorage) RemoveReference(n plumbing.ReferenceName) error {
+	delete(r, n)
+	return nil
+}
+
+type ShallowStorage []plumbing.Hash
+
+func (s *ShallowStorage) SetShallow(commits []plumbing.Hash) error {
+	*s = commits
+	return nil
+}
+
+func (s ShallowStorage) Shallow() ([]plumbing.Hash, error) {
+	return s, nil
+}
+
+type ModuleStorage map[string]*Storage
+
+func (s ModuleStorage) Module(name string) (storage.Storer, error) {
+	if m, ok := s[name]; ok {
+		return m, nil
+	}
+
+	m := NewStorage()
+	s[name] = m
+
+	return m, nil
+}

vendor/github.com/jesseduffield/go-git/v5/storage/storer.go

@@ -0,0 +1,30 @@
+package storage
+
+import (
+	"errors"
+
+	"github.com/jesseduffield/go-git/v5/config"
+	"github.com/jesseduffield/go-git/v5/plumbing/storer"
+)
+
+var ErrReferenceHasChanged = errors.New("reference has changed concurrently")
+
+// Storer is a generic storage of objects, references and any information
+// related to a particular repository. The package github.com/jesseduffield/go-git/v5/storage
+// contains two implementation a filesystem base implementation (such as `.git`)
+// and a memory implementations being ephemeral
+type Storer interface {
+	storer.EncodedObjectStorer
+	storer.ReferenceStorer
+	storer.ShallowStorer
+	storer.IndexStorer
+	config.ConfigStorer
+	ModuleStorer
+}
+
+// ModuleStorer allows interact with the modules' Storers
+type ModuleStorer interface {
+	// Module returns a Storer representing a submodule, if not exists returns a
+	// new empty Storer is returned
+	Module(name string) (Storer, error)
+}