Gsutil: 通过 pip 更新后运行 gsutil 失败

昨天我更新了 gsutil，从那以后它从命令行失败并显示以下堆栈跟踪：

$ gsutil
Traceback (most recent call last):
  File "/usr/local/bin/gsutil", line 11, in <module>
    load_entry_point('gsutil==4.27', 'console_scripts', 'gsutil')()
  File "/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 570, in load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
  File "/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2751, in load_entry_point
    return ep.load()
  File "/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2405, in load
    return self.resolve()
  File "/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2411, in resolve
    module = __import__(self.module_name, fromlist=['__name__'], level=0)
  File "/usr/local/lib/python2.7/site-packages/gslib/__main__.py", line 51, in <module>
    from gslib import metrics
  File "/usr/local/lib/python2.7/site-packages/gslib/metrics.py", line 39, in <module>
    from gslib.util import CalculateThroughput
  File "/usr/local/lib/python2.7/site-packages/gslib/util.py", line 39, in <module>
    from apitools.base.py import http_wrapper
  File "/usr/local/lib/python2.7/site-packages/apitools/base/py/__init__.py", line 20, in <module>
    from apitools.base.py.base_api import *
  File "/usr/local/lib/python2.7/site-packages/apitools/base/py/base_api.py", line 31, in <module>
    from apitools.base.protorpclite import message_types
  File "/usr/local/lib/python2.7/site-packages/apitools/base/protorpclite/message_types.py", line 25, in <module>
    from apitools.base.protorpclite import messages
  File "/usr/local/lib/python2.7/site-packages/apitools/base/protorpclite/messages.py", line 1168, in <module>
    class Field(six.with_metaclass(_FieldMeta, object)):
TypeError: Error when calling the metaclass bases
    metaclass conflict: the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases

这是通过 pip 安装在 FreeBSD 11.1 上的。 它是通过 pip install --upgrade gsutil 升级的。

多年来，相同的设置一直运行良好。 （，我们不是在 FreeBSD 11.1 上，因为它已经好几年没有出来了，但是在同一个安装上）

我认为，这可能是导致问题的依赖项之一。

快到周末了，当然不用着急。 ：微笑：