[issue14238] python shouldn't need username in passwd database

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

> there should be a guard here that just doesn't add user site directories if the lookup fails.
Agreed too.  site is easy to fix (I can do it or review a patch), but we also need to fix sysconfig; I think the right thing to do would be not to have a config var named 'userbase' when run from a UID without passwd entry.  This implies that the functions listed under http://docs.python.org/library/sysconfig#installation-paths would also need to omit *user schemes.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue14238>
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