test_posix.py 文件源码

def _test_all_chown_common(self, chown_func, first_param):
        """Common code for chown, fchown and lchown tests."""
        if os.getuid() == 0:
            try:
                # Many linux distros have a nfsnobody user as MAX_UID-2
                # that makes a good test case for signedness issues.
                #   http://bugs.python.org/issue1747858
                # This part of the test only runs when run as root.
                # Only scary people run their tests as root.
                ent = pwd.getpwnam('nfsnobody')
                chown_func(first_param, ent.pw_uid, ent.pw_gid)
            except KeyError:
                pass
        else:
            # non-root cannot chown to root, raises OSError
            self.assertRaises(OSError, chown_func,
                              first_param, 0, 0)
        # test a successful chown call
        chown_func(first_param, os.getuid(), os.getgid())