def runshellcommand(script, env):
# double-fork to completely detach from the parent process
# based on http://code.activestate.com/recipes/278731
pid = os.fork()
if pid:
# parent
return
# subprocess.Popen() forks again, all we need to add is
# flag the new process as a new session.
if sys.version_info < (3, 2):
newsession = {'preexec_fn': os.setsid}
else:
newsession = {'start_new_session': True}
try:
# connect std* to devnull to make sure the subprocess can't
# muck up these stream for mercurial.
# Connect all the streams to be more close to Windows behavior
# and pager will wait for scripts to end if we don't do that
nullrfd = open(os.devnull, 'r')
nullwfd = open(os.devnull, 'w')
subprocess.Popen(procutil.tonativestr(script),
shell=True,
stdin=nullrfd,
stdout=nullwfd,
stderr=nullwfd,
env=procutil.tonativeenv(env),
close_fds=True,
**newsession)
finally:
# mission accomplished, this child needs to exit and not
# continue the hg process here.
os._exit(0)
def runshellcommand(script, env):
# we can't use close_fds *and* redirect stdin. I'm not sure that we
# need to because the detached process has no console connection.
subprocess.Popen(procutil.tonativestr(script),
shell=True,
env=procutil.tonativeenv(env),
close_fds=True,
creationflags=_creationflags)
def _systembackground(cmd, environ=None, cwd=None):
''' like 'procutil.system', but returns the Popen object directly
so we don't have to wait on it.
'''
cmd = procutil.quotecommand(cmd)
env = procutil.shellenviron(environ)
proc = subprocess.Popen(procutil.tonativestr(cmd),
shell=True,
close_fds=procutil.closefds,
env=procutil.tonativeenv(env),
cwd=pycompat.rapply(procutil.tonativestr, cwd))
return proc