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https://github.com/go-gitea/gitea.git
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When Gitea is running as PID 1 git will occassionally orphan child processes leading to (defunct) processes. This PR simply sets Setpgid to true on these child processes meaning that these defunct processes will also be correctly reaped. Fix #19077 Signed-off-by: Andrew Thornton <art27@cantab.net>
151 lines
3.6 KiB
Go
151 lines
3.6 KiB
Go
// Copyright 2019 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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package git
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import (
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"bufio"
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"context"
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"fmt"
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"io"
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"os"
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"os/exec"
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"regexp"
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"code.gitea.io/gitea/modules/process"
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)
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// BlamePart represents block of blame - continuous lines with one sha
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type BlamePart struct {
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Sha string
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Lines []string
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}
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// BlameReader returns part of file blame one by one
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type BlameReader struct {
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cmd *exec.Cmd
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output io.ReadCloser
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reader *bufio.Reader
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lastSha *string
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cancel context.CancelFunc // Cancels the context that this reader runs in
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finished process.FinishedFunc // Tells the process manager we're finished and it can remove the associated process from the process table
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}
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var shaLineRegex = regexp.MustCompile("^([a-z0-9]{40})")
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// NextPart returns next part of blame (sequential code lines with the same commit)
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func (r *BlameReader) NextPart() (*BlamePart, error) {
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var blamePart *BlamePart
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reader := r.reader
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if r.lastSha != nil {
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blamePart = &BlamePart{*r.lastSha, make([]string, 0)}
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}
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var line []byte
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var isPrefix bool
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var err error
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for err != io.EOF {
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line, isPrefix, err = reader.ReadLine()
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if err != nil && err != io.EOF {
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return blamePart, err
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}
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if len(line) == 0 {
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// isPrefix will be false
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continue
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}
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lines := shaLineRegex.FindSubmatch(line)
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if lines != nil {
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sha1 := string(lines[1])
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if blamePart == nil {
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blamePart = &BlamePart{sha1, make([]string, 0)}
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}
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if blamePart.Sha != sha1 {
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r.lastSha = &sha1
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// need to munch to end of line...
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for isPrefix {
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_, isPrefix, err = reader.ReadLine()
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if err != nil && err != io.EOF {
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return blamePart, err
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}
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}
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return blamePart, nil
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}
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} else if line[0] == '\t' {
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code := line[1:]
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blamePart.Lines = append(blamePart.Lines, string(code))
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}
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// need to munch to end of line...
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for isPrefix {
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_, isPrefix, err = reader.ReadLine()
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if err != nil && err != io.EOF {
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return blamePart, err
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}
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}
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}
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r.lastSha = nil
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return blamePart, nil
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}
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// Close BlameReader - don't run NextPart after invoking that
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func (r *BlameReader) Close() error {
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defer r.finished() // Only remove the process from the process table when the underlying command is closed
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r.cancel() // However, first cancel our own context early
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_ = r.output.Close()
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if err := r.cmd.Wait(); err != nil {
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return fmt.Errorf("Wait: %v", err)
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}
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return nil
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}
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// CreateBlameReader creates reader for given repository, commit and file
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func CreateBlameReader(ctx context.Context, repoPath, commitID, file string) (*BlameReader, error) {
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return createBlameReader(ctx, repoPath, GitExecutable, "blame", commitID, "--porcelain", "--", file)
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}
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func createBlameReader(ctx context.Context, dir string, command ...string) (*BlameReader, error) {
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// Here we use the provided context - this should be tied to the request performing the blame so that it does not hang around.
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ctx, cancel, finished := process.GetManager().AddContext(ctx, fmt.Sprintf("GetBlame [repo_path: %s]", dir))
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cmd := exec.CommandContext(ctx, command[0], command[1:]...)
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cmd.Dir = dir
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cmd.Stderr = os.Stderr
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process.SetSysProcAttribute(cmd)
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stdout, err := cmd.StdoutPipe()
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if err != nil {
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defer finished()
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return nil, fmt.Errorf("StdoutPipe: %v", err)
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}
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if err = cmd.Start(); err != nil {
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defer finished()
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_ = stdout.Close()
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return nil, fmt.Errorf("Start: %v", err)
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}
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reader := bufio.NewReader(stdout)
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return &BlameReader{
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cmd: cmd,
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output: stdout,
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reader: reader,
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cancel: cancel,
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finished: finished,
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}, nil
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}
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