270aab429e
Use common git cat-file --batch and git cat-file --batch-check to
significantly reduce calls to git.
Signed-off-by: Andrew Thornton <art27@cantab.net>
149 lines
3.4 KiB
Go
149 lines
3.4 KiB
Go
// Copyright 2020 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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// +build !gogit
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package git
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import (
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"bufio"
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"errors"
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"io"
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"io/ioutil"
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"strings"
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)
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// ResolveReference resolves a name to a reference
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func (repo *Repository) ResolveReference(name string) (string, error) {
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stdout, err := NewCommand("show-ref", "--hash", name).RunInDir(repo.Path)
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if err != nil {
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if strings.Contains(err.Error(), "not a valid ref") {
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return "", ErrNotExist{name, ""}
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}
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return "", err
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}
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stdout = strings.TrimSpace(stdout)
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if stdout == "" {
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return "", ErrNotExist{name, ""}
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}
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return stdout, nil
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}
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// GetRefCommitID returns the last commit ID string of given reference (branch or tag).
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func (repo *Repository) GetRefCommitID(name string) (string, error) {
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wr, rd, cancel := repo.CatFileBatchCheck()
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defer cancel()
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_, _ = wr.Write([]byte(name + "\n"))
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shaBs, _, _, err := ReadBatchLine(rd)
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if IsErrNotExist(err) {
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return "", ErrNotExist{name, ""}
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}
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return string(shaBs), nil
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}
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// IsCommitExist returns true if given commit exists in current repository.
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func (repo *Repository) IsCommitExist(name string) bool {
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_, err := NewCommand("cat-file", "-e", name).RunInDir(repo.Path)
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return err == nil
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}
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func (repo *Repository) getCommit(id SHA1) (*Commit, error) {
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wr, rd, cancel := repo.CatFileBatch()
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defer cancel()
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_, _ = wr.Write([]byte(id.String() + "\n"))
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return repo.getCommitFromBatchReader(rd, id)
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}
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func (repo *Repository) getCommitFromBatchReader(rd *bufio.Reader, id SHA1) (*Commit, error) {
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_, typ, size, err := ReadBatchLine(rd)
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if err != nil {
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if errors.Is(err, io.EOF) || IsErrNotExist(err) {
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return nil, ErrNotExist{ID: id.String()}
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}
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return nil, err
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}
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switch typ {
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case "missing":
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return nil, ErrNotExist{ID: id.String()}
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case "tag":
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// then we need to parse the tag
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// and load the commit
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data, err := ioutil.ReadAll(io.LimitReader(rd, size))
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if err != nil {
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return nil, err
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}
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_, err = rd.Discard(1)
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if err != nil {
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return nil, err
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}
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tag, err := parseTagData(data)
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if err != nil {
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return nil, err
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}
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tag.repo = repo
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commit, err := tag.Commit()
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if err != nil {
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return nil, err
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}
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commit.CommitMessage = strings.TrimSpace(tag.Message)
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commit.Author = tag.Tagger
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commit.Signature = tag.Signature
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return commit, nil
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case "commit":
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commit, err := CommitFromReader(repo, id, io.LimitReader(rd, size))
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if err != nil {
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return nil, err
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}
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_, err = rd.Discard(1)
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if err != nil {
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return nil, err
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}
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return commit, nil
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default:
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log("Unknown typ: %s", typ)
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_, err = rd.Discard(int(size) + 1)
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if err != nil {
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return nil, err
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}
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return nil, ErrNotExist{
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ID: id.String(),
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}
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}
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}
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// ConvertToSHA1 returns a Hash object from a potential ID string
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func (repo *Repository) ConvertToSHA1(commitID string) (SHA1, error) {
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if len(commitID) == 40 && SHAPattern.MatchString(commitID) {
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sha1, err := NewIDFromString(commitID)
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if err == nil {
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return sha1, nil
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}
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}
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wr, rd, cancel := repo.CatFileBatchCheck()
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defer cancel()
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_, err := wr.Write([]byte(commitID + "\n"))
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if err != nil {
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return SHA1{}, err
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}
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sha, _, _, err := ReadBatchLine(rd)
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if err != nil {
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if IsErrNotExist(err) {
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return SHA1{}, ErrNotExist{commitID, ""}
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}
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return SHA1{}, err
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}
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return MustIDFromString(string(sha)), nil
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}
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