comparison mercurial/cmdutil.py @ 10237:2f7a38f336f4

serve: add and use portable spawnvp replacement

There is no standard python command to really detach a process under Windows.
Instead we use the low level API wrapped by subprocess module with all
necessary options to avoid any kind of context inheritance. Unfortunately, this
version still opens a new window for the child process.

The following have been tried:
- os.spawnv(os.P_NOWAIT): works but the child process is killed when parent
  console terminates.
- os.spawnv(os.P_DETACH): works on python25, hang on python26 when writing to
  the hgweb output socket.
- subprocess.CreateProcess() hack without shell mode: similar to
  os.spawnv(os.P_DETACH).

Fix 1/3 for issue421

10236:49a8625b8cac

                del runargs[i]
                break
            elif runargs[i].startswith('--cwd'):
                del runargs[i:i+2]
                break
        pid = os.spawnvp(os.P_NOWAIT | getattr(os, 'P_DETACH', 0),
                         runargs[0], runargs)
        os.close(wfd)
        os.read(rfd, 1)
        if parentfn:
            return parentfn(pid)
        else:

10237:2f7a38f336f4

                del runargs[i]
                break
            elif runargs[i].startswith('--cwd'):
                del runargs[i:i+2]
                break
        pid = util.spawndetached(runargs)
        os.close(wfd)
        os.read(rfd, 1)
        if parentfn:
            return parentfn(pid)
        else: