pip install -r req.txt should not pull from svn/git/hg if revision is not changed

[vbabiy]

If the revision is fixed in the requirements.txt and the current revision is the same don't update the package. Don't print that this package has been installed either.

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• Bitbucket: https://bitbucket.org/ianb/pip/issue/109
• Originally Reported By:
• Originally Created At: 2010-05-01 17:49:58

[tgecho]

If I understand correctly, this will be made easy/possible if this pull request goes through since right now the original repo url is thrown away.

[RonnyPfannschmidt]

since #507 and #453 got closed, can this one be considered as wontfix? (at least i think its hard/impossible to correctly do that one due to lack of reliable metadata)