That goroutine is launched at the end of Cmd.Start
<https://golang.org/src/os/exec/exec.go?s=11514:11541#L446>, rather than in
exec.CommandContext. That makes sense: you don't want to start the time
bomb until the process has been assigned a pid.
Cmd.Run just does Cmd.Start followed by Cmd.Wait, so I can redo that logic:
cmd.SysProcAttr = &syscall.SysProcAttr{Setsid: true}
err := cmd.Start()
if err == nil {
waitDone := make(chan struct{})
go func() {
select {
case <-ctx.Done():
unix.Kill(-cmd.Process.Pid,
os.Kill.(syscall.Signal))
case <-waitDone:
}
}()
err = cmd.Wait()
close(waitDone)
}
That seems to do the trick - thank you.
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