test_file_util.py 文件源码

def test_copy_file_hard_link_failure(self):
        # If hard linking fails, copy_file() falls back on copying file
        # (some special filesystems don't support hard linking even under
        #  Unix, see issue #8876).
        with open(self.source, 'w') as f:
            f.write('some content')
        st = os.stat(self.source)
        def _os_link(*args):
            raise OSError(0, "linking unsupported")
        old_link = os.link
        os.link = _os_link
        try:
            copy_file(self.source, self.target, link='hard')
        finally:
            os.link = old_link
        st2 = os.stat(self.source)
        st3 = os.stat(self.target)
        self.assertTrue(os.path.samestat(st, st2), (st, st2))
        self.assertFalse(os.path.samestat(st2, st3), (st2, st3))
        for fn in (self.source, self.target):
            with open(fn, 'r') as f:
                self.assertEqual(f.read(), 'some content')