* Andreas Beckmann <a...@debian.org>, 2013-05-27, 05:49:
From the attached log (scroll to the bottom...):
Preparing to replace python-gsw 3.0.1-1 (using .../python-gsw_3.0.1-2_all.deb)
...
Unpacking replacement python-gsw ...
dpkg: error processing /var/cache/apt/archives/python-gsw_3.0.1-2_all.deb
(--unpack):
unable to install new version of
`/usr/lib/python2.7/dist-packages/gsw-3.0.1.egg-info/dependency_links.txt': No
such file or directory
Errors were encountered while processing:
/var/cache/apt/archives/python-gsw_3.0.1-2_all.deb
This is a rather unusual instance of "dpkg won't replace
symlinks-to-directories with directories" problem. It's unusual, because
if you look at each package separately, there are only symlinks to
files, which are supposed to be safe:
3.0.1-1 ships:
/usr/share/pyshared/gsw-3.0.1.egg-info
/usr/lib/python2.7/dist-packages/gsw-3.0.1.egg-info ->
../../../share/pyshared/gsw-3.0.1.egg-info
3.0.1-2 ships:
/usr/share/pyshared/gsw-3.0.1.egg-info/
/usr/share/pyshared/gsw-3.0.1.egg-info/dependency_links.txt
/usr/lib/python2.7/dist-packages/gsw-3.0.1.egg-info/
/usr/lib/python2.7/dist-packages/gsw-3.0.1.egg-info/dependency_links.txt ->
../../../../share/pyshared/gsw-3.0.1.egg-info/dependency_links.txt
This is what happens then dpkg upgrades 3.0.1-1 -> 3.0.1-2:
1) It replaces /usr/share/pyshared/gsw-3.0.1.egg-info (a regular file)
with a directory.
2) It DOESN'T replace
/usr/lib/python2.7/dist-packages/gsw-3.0.1.egg-info with a directory,
because it's now a symlink to a directory.
3) It follows the symlink when creating
/usr/lib/python2.7/dist-packages/gsw-3.0.1.egg-info/dependency_links.txt.
So you end up with two files
(/usr/share/pyshared/gsw-3.0.1.egg-info/dependency_links.txt and
/usr/lib/python2.7/dist-packages/gsw-3.0.1.egg-info/dependency_links.txt)
installed under the same name. This makes dpkg unhappy.
Okay, so why .egg-info suddenly became a directory? It's because of this
fragment of setup.py:
| try:
| from setuptools import setup
| from setuptools.command.sdist import sdist
| except ImportError:
| from distutils.core import setup
| from distutils.command.sdist import sdist
Setuptools creates .egg-info as a directory (putting some extra metadata
there), while distutils always creates .egg-info as a file. Apparently
3.0.1-2 was built in a non-minimal environment which had
python-setuptools installed.
--
Jakub Wilk
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