mirror of
https://codeberg.org/forgejo/forgejo
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2de0752be7
Fix #26064 Some git commands should use parent context, otherwise it would exit too early (by the default timeout, 10m), and the "cmd.Wait" waits till the pipes are closed.
348 lines
9.4 KiB
Go
348 lines
9.4 KiB
Go
// Copyright 2020 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package git
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import (
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"bufio"
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"bytes"
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"context"
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"fmt"
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"io"
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"math"
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"runtime"
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"strconv"
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"strings"
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"code.gitea.io/gitea/modules/log"
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"github.com/djherbis/buffer"
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"github.com/djherbis/nio/v3"
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)
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// WriteCloserError wraps an io.WriteCloser with an additional CloseWithError function
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type WriteCloserError interface {
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io.WriteCloser
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CloseWithError(err error) error
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}
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// EnsureValidGitRepository runs git rev-parse in the repository path - thus ensuring that the repository is a valid repository.
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// Run before opening git cat-file.
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// This is needed otherwise the git cat-file will hang for invalid repositories.
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func EnsureValidGitRepository(ctx context.Context, repoPath string) error {
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stderr := strings.Builder{}
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err := NewCommand(ctx, "rev-parse").
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SetDescription(fmt.Sprintf("%s rev-parse [repo_path: %s]", GitExecutable, repoPath)).
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Run(&RunOpts{
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Dir: repoPath,
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Stderr: &stderr,
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})
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if err != nil {
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return ConcatenateError(err, (&stderr).String())
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}
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return nil
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}
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// CatFileBatchCheck opens git cat-file --batch-check in the provided repo and returns a stdin pipe, a stdout reader and cancel function
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func CatFileBatchCheck(ctx context.Context, repoPath string) (WriteCloserError, *bufio.Reader, func()) {
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batchStdinReader, batchStdinWriter := io.Pipe()
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batchStdoutReader, batchStdoutWriter := io.Pipe()
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ctx, ctxCancel := context.WithCancel(ctx)
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closed := make(chan struct{})
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cancel := func() {
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ctxCancel()
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_ = batchStdoutReader.Close()
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_ = batchStdinWriter.Close()
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<-closed
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}
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// Ensure cancel is called as soon as the provided context is cancelled
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go func() {
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<-ctx.Done()
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cancel()
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}()
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_, filename, line, _ := runtime.Caller(2)
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filename = strings.TrimPrefix(filename, callerPrefix)
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go func() {
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stderr := strings.Builder{}
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err := NewCommand(ctx, "cat-file", "--batch-check").
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SetDescription(fmt.Sprintf("%s cat-file --batch-check [repo_path: %s] (%s:%d)", GitExecutable, repoPath, filename, line)).
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Run(&RunOpts{
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Dir: repoPath,
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Stdin: batchStdinReader,
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Stdout: batchStdoutWriter,
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Stderr: &stderr,
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UseContextTimeout: true,
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})
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if err != nil {
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_ = batchStdoutWriter.CloseWithError(ConcatenateError(err, (&stderr).String()))
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_ = batchStdinReader.CloseWithError(ConcatenateError(err, (&stderr).String()))
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} else {
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_ = batchStdoutWriter.Close()
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_ = batchStdinReader.Close()
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}
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close(closed)
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}()
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// For simplicities sake we'll use a buffered reader to read from the cat-file --batch-check
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batchReader := bufio.NewReader(batchStdoutReader)
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return batchStdinWriter, batchReader, cancel
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}
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// CatFileBatch opens git cat-file --batch in the provided repo and returns a stdin pipe, a stdout reader and cancel function
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func CatFileBatch(ctx context.Context, repoPath string) (WriteCloserError, *bufio.Reader, func()) {
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// We often want to feed the commits in order into cat-file --batch, followed by their trees and sub trees as necessary.
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// so let's create a batch stdin and stdout
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batchStdinReader, batchStdinWriter := io.Pipe()
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batchStdoutReader, batchStdoutWriter := nio.Pipe(buffer.New(32 * 1024))
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ctx, ctxCancel := context.WithCancel(ctx)
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closed := make(chan struct{})
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cancel := func() {
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ctxCancel()
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_ = batchStdinWriter.Close()
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_ = batchStdoutReader.Close()
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<-closed
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}
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// Ensure cancel is called as soon as the provided context is cancelled
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go func() {
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<-ctx.Done()
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cancel()
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}()
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_, filename, line, _ := runtime.Caller(2)
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filename = strings.TrimPrefix(filename, callerPrefix)
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go func() {
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stderr := strings.Builder{}
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err := NewCommand(ctx, "cat-file", "--batch").
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SetDescription(fmt.Sprintf("%s cat-file --batch [repo_path: %s] (%s:%d)", GitExecutable, repoPath, filename, line)).
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Run(&RunOpts{
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Dir: repoPath,
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Stdin: batchStdinReader,
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Stdout: batchStdoutWriter,
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Stderr: &stderr,
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UseContextTimeout: true,
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})
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if err != nil {
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_ = batchStdoutWriter.CloseWithError(ConcatenateError(err, (&stderr).String()))
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_ = batchStdinReader.CloseWithError(ConcatenateError(err, (&stderr).String()))
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} else {
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_ = batchStdoutWriter.Close()
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_ = batchStdinReader.Close()
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}
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close(closed)
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}()
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// For simplicities sake we'll us a buffered reader to read from the cat-file --batch
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batchReader := bufio.NewReaderSize(batchStdoutReader, 32*1024)
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return batchStdinWriter, batchReader, cancel
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}
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// ReadBatchLine reads the header line from cat-file --batch
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// We expect:
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// <sha> SP <type> SP <size> LF
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// sha is a 40byte not 20byte here
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func ReadBatchLine(rd *bufio.Reader) (sha []byte, typ string, size int64, err error) {
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typ, err = rd.ReadString('\n')
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if err != nil {
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return sha, typ, size, err
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}
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if len(typ) == 1 {
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typ, err = rd.ReadString('\n')
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if err != nil {
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return sha, typ, size, err
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}
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}
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idx := strings.IndexByte(typ, ' ')
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if idx < 0 {
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log.Debug("missing space typ: %s", typ)
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return sha, typ, size, ErrNotExist{ID: string(sha)}
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}
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sha = []byte(typ[:idx])
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typ = typ[idx+1:]
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idx = strings.IndexByte(typ, ' ')
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if idx < 0 {
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return sha, typ, size, ErrNotExist{ID: string(sha)}
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}
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sizeStr := typ[idx+1 : len(typ)-1]
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typ = typ[:idx]
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size, err = strconv.ParseInt(sizeStr, 10, 64)
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return sha, typ, size, err
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}
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// ReadTagObjectID reads a tag object ID hash from a cat-file --batch stream, throwing away the rest of the stream.
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func ReadTagObjectID(rd *bufio.Reader, size int64) (string, error) {
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var id string
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var n int64
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headerLoop:
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for {
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line, err := rd.ReadBytes('\n')
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if err != nil {
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return "", err
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}
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n += int64(len(line))
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idx := bytes.Index(line, []byte{' '})
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if idx < 0 {
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continue
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}
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if string(line[:idx]) == "object" {
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id = string(line[idx+1 : len(line)-1])
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break headerLoop
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}
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}
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// Discard the rest of the tag
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discard := size - n + 1
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for discard > math.MaxInt32 {
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_, err := rd.Discard(math.MaxInt32)
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if err != nil {
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return id, err
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}
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discard -= math.MaxInt32
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}
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_, err := rd.Discard(int(discard))
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return id, err
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}
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// ReadTreeID reads a tree ID from a cat-file --batch stream, throwing away the rest of the stream.
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func ReadTreeID(rd *bufio.Reader, size int64) (string, error) {
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var id string
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var n int64
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headerLoop:
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for {
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line, err := rd.ReadBytes('\n')
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if err != nil {
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return "", err
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}
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n += int64(len(line))
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idx := bytes.Index(line, []byte{' '})
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if idx < 0 {
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continue
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}
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if string(line[:idx]) == "tree" {
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id = string(line[idx+1 : len(line)-1])
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break headerLoop
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}
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}
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// Discard the rest of the commit
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discard := size - n + 1
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for discard > math.MaxInt32 {
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_, err := rd.Discard(math.MaxInt32)
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if err != nil {
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return id, err
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}
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discard -= math.MaxInt32
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}
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_, err := rd.Discard(int(discard))
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return id, err
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}
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// git tree files are a list:
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// <mode-in-ascii> SP <fname> NUL <20-byte SHA>
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//
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// Unfortunately this 20-byte notation is somewhat in conflict to all other git tools
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// Therefore we need some method to convert these 20-byte SHAs to a 40-byte SHA
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// constant hextable to help quickly convert between 20byte and 40byte hashes
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const hextable = "0123456789abcdef"
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// To40ByteSHA converts a 20-byte SHA into a 40-byte sha. Input and output can be the
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// same 40 byte slice to support in place conversion without allocations.
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// This is at least 100x quicker that hex.EncodeToString
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// NB This requires that out is a 40-byte slice
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func To40ByteSHA(sha, out []byte) []byte {
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for i := 19; i >= 0; i-- {
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v := sha[i]
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vhi, vlo := v>>4, v&0x0f
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shi, slo := hextable[vhi], hextable[vlo]
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out[i*2], out[i*2+1] = shi, slo
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}
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return out
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}
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// ParseTreeLine reads an entry from a tree in a cat-file --batch stream
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// This carefully avoids allocations - except where fnameBuf is too small.
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// It is recommended therefore to pass in an fnameBuf large enough to avoid almost all allocations
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//
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// Each line is composed of:
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// <mode-in-ascii-dropping-initial-zeros> SP <fname> NUL <20-byte SHA>
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//
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// We don't attempt to convert the 20-byte SHA to 40-byte SHA to save a lot of time
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func ParseTreeLine(rd *bufio.Reader, modeBuf, fnameBuf, shaBuf []byte) (mode, fname, sha []byte, n int, err error) {
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var readBytes []byte
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// Read the Mode & fname
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readBytes, err = rd.ReadSlice('\x00')
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if err != nil {
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return mode, fname, sha, n, err
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}
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idx := bytes.IndexByte(readBytes, ' ')
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if idx < 0 {
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log.Debug("missing space in readBytes ParseTreeLine: %s", readBytes)
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return mode, fname, sha, n, &ErrNotExist{}
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}
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n += idx + 1
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copy(modeBuf, readBytes[:idx])
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if len(modeBuf) >= idx {
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modeBuf = modeBuf[:idx]
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} else {
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modeBuf = append(modeBuf, readBytes[len(modeBuf):idx]...)
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}
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mode = modeBuf
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readBytes = readBytes[idx+1:]
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// Deal with the fname
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copy(fnameBuf, readBytes)
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if len(fnameBuf) > len(readBytes) {
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fnameBuf = fnameBuf[:len(readBytes)]
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} else {
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fnameBuf = append(fnameBuf, readBytes[len(fnameBuf):]...)
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}
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for err == bufio.ErrBufferFull {
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readBytes, err = rd.ReadSlice('\x00')
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fnameBuf = append(fnameBuf, readBytes...)
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}
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n += len(fnameBuf)
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if err != nil {
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return mode, fname, sha, n, err
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}
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fnameBuf = fnameBuf[:len(fnameBuf)-1]
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fname = fnameBuf
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// Deal with the 20-byte SHA
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idx = 0
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for idx < 20 {
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var read int
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read, err = rd.Read(shaBuf[idx:20])
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n += read
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if err != nil {
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return mode, fname, sha, n, err
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}
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idx += read
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}
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sha = shaBuf
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return mode, fname, sha, n, err
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}
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var callerPrefix string
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func init() {
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_, filename, _, _ := runtime.Caller(0)
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callerPrefix = strings.TrimSuffix(filename, "modules/git/batch_reader.go")
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}
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