Conda 不会更新软件包

Question

如果我尝试更新 conda 中的任何包，无论环境如何，我都会收到“找不到图像”错误。这是完整的错误消息。它今天才开始这样做，我没有安装任何新的东西或改变我所知道的任何东西。有人知道如何修复吗？

Traceback (most recent call last):
  File "/Users/matthewthomas/anaconda3/lib/python3.7/site-packages/conda/exceptions.py", line 1079, in __call__
    return func(*args, **kwargs)
  File "/Users/matthewthomas/anaconda3/lib/python3.7/site-packages/conda/cli/main.py", line 84, in _main
    exit_code = do_call(args, p)
  File "/Users/matthewthomas/anaconda3/lib/python3.7/site-packages/conda/cli/conda_argparse.py", line 80, in do_call
    module = import_module(relative_mod, __name__.rsplit('.', 1)[0])
  File "/Users/matthewthomas/anaconda3/lib/python3.7/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 728, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/Users/matthewthomas/anaconda3/lib/python3.7/site-packages/conda/cli/main_update.py", line 8, in <module>
    from .install import install
  File "/Users/matthewthomas/anaconda3/lib/python3.7/site-packages/conda/cli/install.py", line 19, in <module>
    from ..core.index import calculate_channel_urls, get_index
  File "/Users/matthewthomas/anaconda3/lib/python3.7/site-packages/conda/core/index.py", line 10, in <module>
    from .package_cache_data import PackageCacheData
  File "/Users/matthewthomas/anaconda3/lib/python3.7/site-packages/conda/core/package_cache_data.py", line 15, in <module>
    from .path_actions import CacheUrlAction, ExtractPackageAction
  File "/Users/matthewthomas/anaconda3/lib/python3.7/site-packages/conda/core/path_actions.py", line 30, in <module>
    from ..gateways.connection.download import download
  File "/Users/matthewthomas/anaconda3/lib/python3.7/site-packages/conda/gateways/connection/download.py", line 13, in <module>
    import ctypes
  File "/Users/matthewthomas/anaconda3/lib/python3.7/ctypes/__init__.py", line 7, in <module>
    from _ctypes import Union, Structure, Array
ImportError: dlopen(/Users/matthewthomas/anaconda3/lib/python3.7/lib-dynload/_ctypes.cpython-37m-darwin.so, 2): Library not loaded: @rpath/libffi.6.dylib
  Referenced from: /Users/matthewthomas/anaconda3/lib/python3.7/lib-dynload/_ctypes.cpython-37m-darwin.so
  Reason: image not found

Answer 1

这是libffi引起的依赖错误。转到/Users/<user_name>/anaconda3/lib，将现有的更高版本 libffi 链接为libffi.6.dylib。就我而言，这是

ln -s libffi.7.dylib libffi.6.dylib

Answer 2

使用自制软件安装 libffi

$ brew install libffi
...
For compilers to find libffi you may need to set:
  export LDFLAGS="-L/usr/local/opt/libffi/lib"

然后运行

$ cp /usr/local/opt/libffi/lib/libffi.6.dylib /Users/matthewthomas/anaconda3/lib/

我在 macOS 10.15.4 上以这种方式修复了我的问题