VersionConflict error should report information about who is requiring the package in question

[ghost]

Originally reported by: msabramo (Bitbucket: msabramo, GitHub: msabramo)

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Current VersionConflict error looks like this:

$ pserve development.ini
Traceback (most recent call last):
...
  File "/Users/marca/dev/surveymonkey/profilesvc/lib/python2.6/site-packages/paste/deploy/loadwsgi.py", line 573, in find_egg_entry_point
    pkg_resources.require(self.spec)
  File "/Users/marca/dev/hg-repos/setuptools/pkg_resources.py", line 728, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/Users/marca/dev/hg-repos/setuptools/pkg_resources.py", line 627, in resolve
    raise VersionConflict(dist, req)
pkg_resources.VersionConflict: 
(PasteDeploy 1.3.4 (/Users/marca/dev/surveymonkey/profilesvc/lib/python2.6/site-packages),
Requirement.parse('PasteDeploy>=1.5.0'))

What I'd like is to know is which package is requiring a different version of the package from what I have currently installed -- e.g.:

pkg_resources.VersionConflict: PasteDeploy 1.3.4 is installed but PasteDeploy>=1.5.0 is required by ['pyramid']

PR: https://bitbucket.org/pypa/setuptools/pull-request/89/make-versionconflict-report-who-is/diff

Cc: @sontek, @aconrad, @sudarkoff

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• Bitbucket: https://bitbucket.org/pypa/setuptools/issue/268

[ghost]

Original comment by msabramo (Bitbucket: msabramo, GitHub: msabramo):

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Here's a PR that attempts to solve this issue:

https://bitbucket.org/pypa/setuptools/pull-request/89/make-versionconflict-report-who-is/diff

[ghost]

Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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Make VersionConflict report who is requiring package

fixes issue 268

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Original comment by msabramo (Bitbucket: msabramo, GitHub: msabramo):

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@jaraco: Did you want me to remove:

https://bitbucket.org/pypa/setuptools/src/0515c3914a7a323fe7756e886d2968673b3e6fb6/pkg_resources.py#cl-638

It says # XXX put more info here -- does my change provide the info you were thinking of or is there more that we could be doing?

[ghost]

Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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Hmm. I think I made that change in a commit subsequent to yours. If not, that's the thing to do. That TODO has been around a long time.

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Original comment by msabramo (Bitbucket: msabramo, GitHub: msabramo):

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Looks like the original origin of that comment goes back to https://bitbucket.org/pypa/setuptools/commits/ba233d2c9c809d8b2d75e7036f443691c03fda20#chg-pkg_resources.py in 2005. Probably P.J. Eby?

[ghost]

Original comment by msabramo (Bitbucket: msabramo, GitHub: msabramo):

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Coolness. This seems to have debuted in the newly released setuptools 6.1 - https://pypi.python.org/pypi/setuptools/6.1#id1

[ghost]

Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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This issue is implicated in #281.