升级到Python 2.7.10_2会导致包出现“图像未找到”的失败

Question

使用以下方法更新Homebrew

brew update
brew upgrade --all

这导致Python更新为2.7.10_2，pip (和许多其他脚本)将失败。

cffi.ffiplatform.VerificationError: importing '/usr/local/lib/python2.7/site-packages/cryptography/_Cryptography_cffi_a269d620xd5c405b7.so': dlopen(/usr/local/lib/python2.7/site-packages/cryptography/_Cryptography_cffi_a269d620xd5c405b7.so, 2): Library not loaded: /usr/local/lib/libssl.1.0.0.dylib
  Referenced from: /usr/local/lib/python2.7/site-packages/cryptography/_Cryptography_cffi_a269d620xd5c405b7.so
  Reason: image not found

我能做些什么来恢复或调整我的Python配置以使它再次工作？是什么破坏了它？

Traceback (most recent call last):
  File "/usr/local/bin/eb", line 7, in <module>
    from ebcli.core.ebcore import main
  File "/usr/local/lib/python2.7/site-packages/ebcli/core/ebcore.py", line 43, in <module>
    from . import globals, base, io, hooks
  File "/usr/local/lib/python2.7/site-packages/ebcli/core/hooks.py", line 20, in <module>
    from ..lib import aws
  File "/usr/local/lib/python2.7/site-packages/ebcli/lib/aws.py", line 19, in <module>
    import botocore.session
  File "/usr/local/lib/python2.7/site-packages/ebcli/bundled/botocore/session.py", line 27, in <module>
    import botocore.credentials
  File "/usr/local/lib/python2.7/site-packages/ebcli/bundled/botocore/credentials.py", line 30, in <module>
    from botocore.utils import InstanceMetadataFetcher, parse_key_val_file
  File "/usr/local/lib/python2.7/site-packages/ebcli/bundled/botocore/utils.py", line 25, in <module>
    from botocore.vendored import requests
  File "/usr/local/lib/python2.7/site-packages/ebcli/bundled/botocore/vendored/requests/__init__.py", line 53, in <module>
    from .packages.urllib3.contrib import pyopenssl
  File "/usr/local/lib/python2.7/site-packages/ebcli/bundled/botocore/vendored/requests/packages/urllib3/contrib/pyopenssl.py", line 55, in <module>
    import OpenSSL.SSL
  File "/usr/local/lib/python2.7/site-packages/OpenSSL/__init__.py", line 8, in <module>
    from OpenSSL import rand, crypto, SSL
  File "/usr/local/lib/python2.7/site-packages/OpenSSL/rand.py", line 11, in <module>
    from OpenSSL._util import (
  File "/usr/local/lib/python2.7/site-packages/OpenSSL/_util.py", line 7, in <module>
    binding = Binding()
  File "/usr/local/lib/python2.7/site-packages/cryptography/hazmat/bindings/openssl/binding.py", line 114, in __init__
    self._ensure_ffi_initialized()
  File "/usr/local/lib/python2.7/site-packages/cryptography/hazmat/bindings/openssl/binding.py", line 126, in _ensure_ffi_initialized
    cls._modules,
  File "/usr/local/lib/python2.7/site-packages/cryptography/hazmat/bindings/utils.py", line 31, in load_library_for_binding
    lib = ffi.verifier.load_library()
  File "/usr/local/lib/python2.7/site-packages/cffi/verifier.py", line 97, in load_library
    return self._load_library()
  File "/usr/local/lib/python2.7/site-packages/cffi/verifier.py", line 207, in _load_library
    return self._vengine.load_library()
  File "/usr/local/lib/python2.7/site-packages/cffi/vengine_cpy.py", line 155, in load_library
    raise ffiplatform.VerificationError(error)
cffi.ffiplatform.VerificationError: importing '/usr/local/lib/python2.7/site-packages/cryptography/_Cryptography_cffi_a269d620xd5c405b7.so': dlopen(/usr/local/lib/python2.7/site-packages/cryptography/_Cryptography_cffi_a269d620xd5c405b7.so, 2): Library not loaded: /usr/local/lib/libssl.1.0.0.dylib
  Referenced from: /usr/local/lib/python2.7/site-packages/cryptography/_Cryptography_cffi_a269d620xd5c405b7.so
  Reason: image not found

OSX 10.10.4；自制0.9.5

Answer 1

蒂姆·史密斯的回答是正确的(他是个自制的维护者！)但它并没有提供实际的解决办法。在梳理完这些问题之后，https://github.com/Homebrew/homebrew/issues/41613和https://github.com/pyca/cryptography/issues/2138将使您的python/pip再次使用openssl

brew link openssl --force
pip uninstall cryptography
pip install cryptography --no-use-wheel
brew unlink openssl

第一个链接临时修复pip。密码学是需要重建的库。最后，再次断开openssl的链接。

Answer 2

这是一个一次性错误，原因是( 1)我们决定删除OpenSSL的“只限桶”的名称，然后在我们发现它造成了严重的不兼容之后，我们随后退出了该决定。如果您在openssl不只是keg的期间使用OpenSSL从源代码中构建任何内容，则需要重新构建它。这是因为普通包的install_names相对于HOMEBREW_PREFIX和只用于keg的包没有链接到HOMEBREW_PREFIX。(只带桶的包有指向私有前缀的install_names。)很抱歉给您带来不便。