Matthias: I think the problem here is that the logic for selecting
between dist-packages and site-packages is not consistent. Ignoring
--install-layout for a moment, distutils.sysconfig says, in effect:
is_default_prefix = not prefix or os.path.normpath(prefix) in ('/usr',
'/usr/local')
if is_default_prefix and 'PYTHONUSERBASE' not in os.environ and 'real_prefix'
not in sys.__dict__:
return os.path.join(libpython, "dist-packages")
... while distutils.command.install says, in effect:
if self.prefix_option or 'real_prefix' in sys.__dict__:
self.select_scheme("unix_prefix")
else:
self.select_scheme("unix_local")
I think that we should be consistent here, and apply the same "is the
prefix /usr or /usr/local?" check in distutils.command.install (and
perhaps check PYTHONUSERBASE too, though that's a side issue) - if it
is, we should use the unix_local scheme and thus install into dist-
packages rather than site-packages.
This bug seems more important than wishlist - it breaks third-party
build systems that use --prefix=/usr/local in the expectation that it
will install things somewhere sensible where the version of python
you're using will be able to get at them. (Such build systems can simply
remove --prefix=/usr/local as a workaround, but with older packaged
versions of python in Debian/Ubuntu that will install into /usr which is
obviously undesirable.)
--
Python distutils installs into 'site-packages' instead of 'dist-packages' when
a prefix is set
https://bugs.launchpad.net/bugs/362570
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