Pants安装错误：“失败:无法检测到合适的兼容解释器：(冲突目标：)”

Question

我用的裤子版本0.0.32 +再多几次来自师父的投稿。

我想使用一个在Linux和MacOS支持中捆绑的pex发行版。我正在用Pants回购工具建造pex：

git clean -fdx
PANTS_DEV=1 ./pants binary ./src/python/pants/bin:pants

我使用了新创建的文件dist/pants.pex，它在我的mac上运行得很好。当我试图在Linux环境中运行它时，它退出时会出现一个错误：

./pants test foo
Running Pants version square-20150331-02
...
11:53:22 00:08     [pytest]
11:53:22 00:08       [run]
                 WARN] /data/app/kochiku-worker/.pex/install/requests-2.5.3-py2.py3-none-any.whl.ed9d28acc3c467062b25b9dc2e2084d6efa8ee1e/requests-2.5.3-py2.py3-none-any.whl/requests/packages/urllib3/connection.py:251: SecurityWarning: Certificate has no `subjectAltName`, falling back to check for a `commonName` for now. This feature is being removed by major browsers and deprecated by RFC 2818. (See https://github.com/shazow/urllib3/issues/497 for details.)
  SecurityWarning


FAILURE: Unable to detect a suitable interpreter for compatibilities:  (Conflicting targets: )

[32m
           Waiting for background workers to finish.[0m[31m
           FAILURE[0m

我认为这里发生的事情是，由于某种原因，裤子在Python2.6下运行。我研究了安全错误，在使用python 2.7.2之前使用python版本时，它可能会意外地被绊倒。我试图使用的机器上安装的python版本安装在/usr/local/bin中，版本为2.7.9

Answer 1

好的-在0.0.32版本的失败消息中，我发现了这个task.py代码：

def select_interpreter_for_targets(self, targets):
  """Pick an interpreter compatible with all the specified targets."""
  allowed_interpreters = OrderedSet(self.interpreter_cache.interpreters)
  targets_with_compatibilities = []  # Used only for error messages.

  # Constrain allowed_interpreters based on each target's compatibility requirements.
  for target in targets:
    if target.is_python and hasattr(target, 'compatibility') and target.compatibility:
      targets_with_compatibilities.append(target)
      compatible_with_target = list(self.interpreter_cache.matches(target.compatibility))
      allowed_interpreters &= compatible_with_target

  if not allowed_interpreters:
    # Create a helpful error message.
    unique_compatibilities = set(tuple(t.compatibility) for t in targets_with_compatibilities)
    unique_compatibilities_strs = [','.join(x) for x in unique_compatibilities if x]
    targets_with_compatibilities_strs = [str(t) for t in targets_with_compatibilities]
    raise TaskError('Unable to detect a suitable interpreter for compatibilities: %s '
                    '(Conflicting targets: %s)' % (' && '.join(unique_compatibilities_strs),
                                                   ', '.join(targets_with_compatibilities_strs)))

allowed_interpreters从interpreter_cache返回为空，该代码查看配置值，这些配置值的键最近发生了更改，以便引导解释器。我猜您的回购中有一个pants.ini配置，丢失了键名的更改。

在pantsbuild中有一个检查陈旧pants.ini配置键的工具。您可以在pantsbuild/pants的克隆体中运行它，并指向您自己的回购的pants.ini，如下所示：

$ ./pants run src/python/pants/option/:migrate_config -- [path to your repo's pants.ini]

我最近在升级twitter/commons时就这样做了。对更改进行了检查，这里和工具输出如下：

$ ./pants run src/python/pants/option/:migrate_config -- ~/dev-jsirois-commons/pants.ini
...
17:53:44 00:00   [run]
17:53:44 00:00     [py]
17:53:44 00:00       [chroot]
17:53:44 00:00       [run]
Checking config file at /home/jsirois/dev-jsirois-commons/pants.ini for unmigrated keys.
Found indices in section [python-repos]. Should be indexes in section [python-repos].

17:53:44 00:00     [jvm]
17:53:44 00:00     [cpp-run]
               SUCCESS

注意Found indices in section [python-repos]. Should be indexes in section [python-repos]。您可能也有同样的未迁移的inidices键绊倒您。

Answer 2

您可以使用环境变量PEX_VERBOSE=1运行--这将为您提供更多关于使用哪个版本运行的Python的信息。您的系统Python也可能被错误地配置为使用2.6中的库。

作为一个核心选项，您可以尝试使用python.sh来查看它是否有助于修复您的python环境。