project_commands.py 文件源码

def execvpe(self):
        """Convenience method exec's the command replacing the current process.

        Returns:
            Does not return. May raise an OSError though.
        """
        args = copy(self._args)
        if self._shell:
            assert len(args) == 1
            if _is_windows():
                # The issue here is that in Lib/subprocess.py in
                # the Python distribution, if shell=True the code
                # jumps through some funky hoops setting flags on
                # the Windows API calls. We need to do that, rather
                # than calling os.execvpe which doesn't let us set those
                # flags. So we spawn the child and then exit.
                self.popen()
                sys.exit(0)
            else:
                # this is all shell=True does on unix
                args = ['/bin/sh', '-c'] + args

        try:
            old_dir = os.getcwd()
            os.chdir(self._cwd)
            sys.stderr.flush()
            sys.stdout.flush()
            _verbose_logger().info("$ %s", " ".join(args))
            os.execvpe(args[0], args, self._env)
        finally:
            # avoid side effect if exec fails (or is mocked in tests)
            os.chdir(old_dir)