buildkit/source/git/gitsource_unix.go

// +build !windows

package git

import (
	"context"
	"os/exec"
	"syscall"
	"time"
)

func runProcessGroup(ctx context.Context, cmd *exec.Cmd) error {
	cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
	if err := cmd.Start(); err != nil {
		return err
	}
	waitDone := make(chan struct{})
	go func() {
		select {
		case <-ctx.Done():
			syscall.Kill(-cmd.Process.Pid, syscall.SIGTERM)
			go func() {
				select {
				case <-waitDone:
				case <-time.After(10 * time.Second):
					syscall.Kill(-cmd.Process.Pid, syscall.SIGKILL)
				}
			}()
		case <-waitDone:
		}
	}()
	err := cmd.Wait()
	close(waitDone)
	return err
}