def test_extract_with_symlink_and_change_topdir(self):
    if sys.platform.startswith("win"):
        return
    src = os.path.join(self.tmp, "src")
    os.mkdir(src)
    a_long_dir = os.path.join(src, "a_long_dir")
    os.mkdir(a_long_dir)
    a_file = os.path.join(a_long_dir, "a_file")
    with open(a_file, "w") as fp:
        fp.write("a_file\n")
    a_link = os.path.join(a_long_dir, "a_link")
    os.symlink("a_file", a_link)
    tar_gz = qibuild.archive.zip_unix(a_long_dir)
    dest = os.path.join(self.tmp, "dest")
    os.mkdir(dest)
    qibuild.archive.extract(tar_gz, dest, topdir="a_dir")
    ls_r = qibuild.sh.ls_r(dest)
    self.assertEquals(ls_r,
        ['a_dir/a_file', 'a_dir/a_link'])
    dest_link = os.path.join(dest, "a_dir", "a_link")
    self.assertTrue(os.path.islink(dest_link))
    dest_target = os.readlink(dest_link)
    self.assertEquals(dest_target, "a_file")