posix_spawn.py

# Works with py2 and py3
import ctypes
import os
import sys

libSystem = ctypes.CDLL('libSystem.dylib')

spawn = libSystem.posix_spawnp
spawn.restype = ctypes.c_int
spawn.argtypes = (
        ctypes.POINTER(ctypes.c_int),
        ctypes.c_char_p, ctypes.c_void_p, ctypes.c_void_p,
        ctypes.POINTER(ctypes.c_char_p),
        ctypes.POINTER(ctypes.c_char_p)
)

def charpp(a): return (ctypes.c_char_p * len(a))(*a)

argv = list(map(ctypes.c_char_p, b'git -c core.deltaBaseCacheLimit=2g clone --no-checkout --progress https://chromium.googlesource.com/chromium/src.git _gclient_src_mmdd8v1w'.split())) + [None]
envp = [ctypes.c_char_p(('%s=%s' % (k, os.environ[k])).encode('utf-8')) for k in os.environ] + [None]

pid = ctypes.c_int()

e = spawn(ctypes.byref(pid), ctypes.c_char_p(b"git"), None, None, charpp(argv), charpp(envp))

if e != 0:
  print('spawn failed')
  sys.exit(1)

os.waitpid(pid.value, 0)