run_proc.py

run_proc.py

def run_proc(cmd, stdin=None, env=None):
    """Runs the given cmd as a subprocess, where cmd is a list suitable
    for passing to subprocess.call. Returns a 3-tuple of

        (exit code, stdout, stderr)

    If stdin is not None, it will be passed into the subprocess on STDIN. If
    env is not None, it will be used to augment the environment of the
    subprocess.
    """
    assert isinstance(cmd, (list, tuple))
    popen_args = dict(stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    if stdin is not None:
        popen_args['stdin'] = subprocess.PIPE
    if env is not None:
        new_env = os.environ.copy()
        new_env.update(env)
        popen_args['env'] = new_env
    proc = subprocess.Popen(cmd, **popen_args)
    out, err = proc.communicate(input=stdin)
    return proc.returncode, out.strip(), err.strip()