Set Setpgid on child git processes

cmd/serv.go

@@ -24,6 +24,7 @@ import (
 	"code.gitea.io/gitea/modules/log"
 	"code.gitea.io/gitea/modules/pprof"
 	"code.gitea.io/gitea/modules/private"
+	"code.gitea.io/gitea/modules/process"
 	repo_module "code.gitea.io/gitea/modules/repository"
 	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/services/lfs"
@@ -306,6 +307,7 @@ func runServ(c *cli.Context) error {
 		}
 	}
 
+	process.SetSysProcAttribute(gitcmd)
 	gitcmd.Dir = setting.RepoRootPath
 	gitcmd.Stdout = os.Stdout
 	gitcmd.Stdin = os.Stdin

modules/git/blame.go

@@ -124,6 +124,7 @@ func createBlameReader(ctx context.Context, dir string, command ...string) (*Bla
 	cmd := exec.CommandContext(ctx, command[0], command[1:]...)
 	cmd.Dir = dir
 	cmd.Stderr = os.Stderr
+	process.SetSysProcAttribute(cmd)
 
 	stdout, err := cmd.StdoutPipe()
 	if err != nil {

modules/git/command.go

@@ -157,6 +157,7 @@ func (c *Command) Run(opts *RunOpts) error {
 		"GIT_NO_REPLACE_OBJECTS=1",
 	)
 
+	process.SetSysProcAttribute(cmd)
 	cmd.Dir = opts.Dir
 	cmd.Stdout = opts.Stdout
 	cmd.Stderr = opts.Stderr

modules/markup/external/external.go

@@ -124,6 +124,8 @@ func (p *Renderer) Render(ctx *markup.RenderContext, input io.Reader, output io.
 		cmd.Stdin = input
 	}
 	cmd.Stdout = output
+	process.SetSysProcAttribute(cmd)
+
 	if err := cmd.Run(); err != nil {
 		return fmt.Errorf("%s render run command %s %v failed: %v", p.Name(), commands[0], args, err)
 	}

modules/process/manager_exec.go

@@ -58,6 +58,7 @@ func (pm *Manager) ExecDirEnvStdIn(ctx context.Context, timeout time.Duration, d
 	if stdIn != nil {
 		cmd.Stdin = stdIn
 	}
+	SetSysProcAttribute(cmd)
 
 	if err := cmd.Start(); err != nil {
 		return "", "", err

modules/process/manager_unix.go

@@ -0,0 +1,18 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+//go:build !windows
+
+package process
+
+import (
+	"os/exec"
+	"syscall"
+)
+
+// SetSysProcAttribute sets the common SysProcAttrs for commands
+func SetSysProcAttribute(cmd *exec.Cmd) {
+	// When Gitea runs SubProcessA -> SubProcessB and SubProcessA gets killed by context timeout, use setpgid to make sure the sub processes can be reaped instead of leaving defunct(zombie) processes.
+	cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
+}

modules/process/manager_windows.go

@@ -0,0 +1,16 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+//go:build windows
+
+package process
+
+import (
+	"os/exec"
+)
+
+// SetSysProcAttribute sets the common SysProcAttrs for commands
+func SetSysProcAttribute(cmd *exec.Cmd) {
+	// Do nothing
+}

modules/ssh/ssh.go

@@ -102,6 +102,8 @@ func sessionHandler(session ssh.Session) {
 	}
 	defer stdin.Close()
 
+	process.SetSysProcAttribute(cmd)
+
 	wg := &sync.WaitGroup{}
 	wg.Add(2)
 

services/mailer/mailer.go

@@ -281,6 +281,7 @@ func (s *sendmailSender) Send(from string, to []string, msg io.WriterTo) error {
 	if err != nil {
 		return err
 	}
+	process.SetSysProcAttribute(cmd)
 
 	if err = cmd.Start(); err != nil {
 		_ = pipe.Close()