Cannot vendor enum34 (fails to fetch license)

[smola]

Trying to fetch license for enum34 raises an exception, and the license fallback is not picked up.

This seems to be a pip issue: pypa/pip#8214

Example configuration:

# pyproject.toml

[tool.vendoring]
destination = "_vendor/"
requirements = "_vendor/vendor.txt"
namespace = "_vendor"
protected-files = ["__init__.py", "vendor.txt"]
patches-dir = "tools/vendoring/patches"

[tool.vendoring.transformations]
substitute = []
drop = []

[tool.vendoring.typing-stubs]

[tool.vendoring.license.directories]
enum34 = "enum"

[tool.vendoring.license.fallback-urls]
enum34 = "https://raw.githubusercontent.com/pradyunsg/vendoring/master/LICENSE"

# _vendor/vendor.txt
enum34==1.1.10

vendoring sync . output:

Load configuration... Done!
Clean existing libraries... Done!
Add vendored libraries... Done!
Fetch licenses...
  Running pip download -r _vendor/vendor.txt --no-binary :all: --no-deps --dest /tmp/vendoring-cache
    Collecting enum34==1.1.10
      Using cached enum34-1.1.10.tar.gz (28 kB)
        ERROR: Command errored out with exit status 1:
         command: /home/smola/.pyenv/versions/3.8.5/bin/python3.8 -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-download-t2hxg965/enum34/setup.py'"'"'; __file__='"'"'/tmp/pip-download-t2hxg965/enum34/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-pip-egg-info-3_1sdg4u
             cwd: /tmp/pip-download-t2hxg965/enum34/
        Complete output (11 lines):
        Traceback (most recent call last):
          File "<string>", line 1, in <module>
          File "/home/smola/.pyenv/versions/3.8.5/lib/python3.8/site-packages/setuptools/__init__.py", line 5, in <module>
            import distutils.core
          File "/home/smola/.pyenv/versions/3.8.5/lib/python3.8/distutils/core.py", line 16, in <module>
            from distutils.dist import Distribution
          File "/home/smola/.pyenv/versions/3.8.5/lib/python3.8/distutils/dist.py", line 9, in <module>
            import re
          File "/home/smola/.pyenv/versions/3.8.5/lib/python3.8/re.py", line 145, in <module>
            class RegexFlag(enum.IntFlag):
        AttributeError: module 'enum' has no attribute 'IntFlag'
        ----------------------------------------
    ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
  Command exited with non-zero exit code: 1

[pradyunsg]

Thanks for filing this issue! ^>^

I don't think there's much that vendoring can do here. The thing that's failing is the pip download call, and there's nothing we can do from within vendoring that'll make that command pass. :)

[smola]

I didn't test it yet, but I think this should be fixed in the next pip release by this:
pypa/pip#9689