test_shutil.py 文件源码

def test_copystat_symlinks(self):
        tmp_dir = self.mkdtemp()
        src = os.path.join(tmp_dir, 'foo')
        dst = os.path.join(tmp_dir, 'bar')
        src_link = os.path.join(tmp_dir, 'baz')
        dst_link = os.path.join(tmp_dir, 'qux')
        write_file(src, 'foo')
        src_stat = os.stat(src)
        os.utime(src, (src_stat.st_atime,
                       src_stat.st_mtime - 42.0))  # ensure different mtimes
        write_file(dst, 'bar')
        self.assertNotEqual(os.stat(src).st_mtime, os.stat(dst).st_mtime)
        os.symlink(src, src_link)
        os.symlink(dst, dst_link)
        if hasattr(os, 'lchmod'):
            os.lchmod(src_link, stat.S_IRWXO)
        if hasattr(os, 'lchflags') and hasattr(stat, 'UF_NODUMP'):
            os.lchflags(src_link, stat.UF_NODUMP)
        src_link_stat = os.lstat(src_link)
        # follow
        if hasattr(os, 'lchmod'):
            shutil.copystat(src_link, dst_link, follow_symlinks=True)
            self.assertNotEqual(src_link_stat.st_mode, os.stat(dst).st_mode)
        # don't follow
        shutil.copystat(src_link, dst_link, follow_symlinks=False)
        dst_link_stat = os.lstat(dst_link)
        if os.utime in os.supports_follow_symlinks:
            for attr in 'st_atime', 'st_mtime':
                # The modification times may be truncated in the new file.
                self.assertLessEqual(getattr(src_link_stat, attr),
                                     getattr(dst_link_stat, attr) + 1)
        if hasattr(os, 'lchmod'):
            self.assertEqual(src_link_stat.st_mode, dst_link_stat.st_mode)
        if hasattr(os, 'lchflags') and hasattr(src_link_stat, 'st_flags'):
            self.assertEqual(src_link_stat.st_flags, dst_link_stat.st_flags)
        # tell to follow but dst is not a link
        shutil.copystat(src_link, dst, follow_symlinks=False)
        self.assertTrue(abs(os.stat(src).st_mtime - os.stat(dst).st_mtime) <
                        00000.1)