python-apt offends python-pip's freeze

[Muelli]

I'm trying to use pip freeze, but it fails:

>pip freeze
Exception:
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/pip/basecommand.py", line 122, in main
    status = self.run(options, args)
  File "/usr/lib/python2.7/dist-packages/pip/commands/freeze.py", line 74, in run
    req = pip.FrozenRequirement.from_dist(dist, dependency_links, find_tags=find_tags)
  File "/usr/lib/python2.7/dist-packages/pip/__init__.py", line 299, in from_dist
    assert len(specs) == 1 and specs[0][0] == '==', (dist, req, specs, dependency_links)
AssertionError: (python-apt 0.9.3.11build1 (/usr/lib/python2.7/dist-packages), Requirement.parse('python-apt===0.9.3.11build1'), [('===', '0.9.3.11build1')], ['https://pypi.python.org/packages/source/c/certifi/certifi-1.0.1.tar.gz#md5=45f5cb94b8af9e1df0f9450a8f61b790', 'https://pypi.python.org/packages/source/w/wincertstore/wincertstore-0.2.zip#md5=ae728f2f007185648d0c7a8679b361e2'])

Note that I've patched /usr/lib/python2.7/dist-packages/pip/__init__.py to show me the dist.

It seems that pip does not like the string python-apt===0.9.3.11build1

This could be https://github.com/pypa/pip/issues/1093

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: python-apt 0.9.3.11build1
ProcVersionSignature: Ubuntu 3.19.0-25.26-generic 3.19.8-ckt2
Uname: Linux 3.19.0-25-generic x86_64
ApportVersion: 2.17.2-0ubuntu1.2
Architecture: amd64
CurrentDesktop: GNOME
Date: Thu Aug 27 14:25:36 2015
SourcePackage: python-apt
UpgradeStatus: No upgrade log present (probably fresh install)

[Muelli (ubuntu-bugs-auftrags-killer)]

I think the duplicate status is wrong.

I did a sudo apt-get install -t wily python-apt to get 1.0.0~beta3.1ubuntu1 which is the version which is supposed to fix the problem.
However, pip freeze still fails.

$ pip freeze
Exception:
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/pip/basecommand.py", line 122, in main
    status = self.run(options, args)
  File "/usr/lib/python2.7/dist-packages/pip/commands/freeze.py", line 74, in run
    req = pip.FrozenRequirement.from_dist(dist, dependency_links, find_tags=find_tags)
  File "/usr/lib/python2.7/dist-packages/pip/__init__.py", line 299, in from_dist
    assert len(specs) == 1 and specs[0][0] == '==', (dist, req, specs, dependency_links)
AssertionError: (python-apt 1.0.0.b3.1-ubuntu1 (/usr/lib/python2.7/dist-packages), Requirement.parse('python-apt===1.0.0.b3.1-ubuntu1'), [('===', '1.0.0.b3.1-ubuntu1')], ['https://pypi.python.org/packages/source/c/certifi/certifi-1.0.1.tar.gz#md5=45f5cb94b8af9e1df0f9450a8f61b790', 'https://pypi.python.org/packages/source/w/wincertstore/wincertstore-0.2.zip#md5=ae728f2f007185648d0c7a8679b361e2'])

[Julian Andres Klode (juliank)]

Nah, we just had a temporary hick up with the ~beta3.1 thing, which should have been ~beta4.

[Julian Andres Klode (juliank)]

Will be fixed again with the next upload.

[Barry Warsaw (barry)]

On Aug 27, 2015, at 01:22 PM, Muelli wrote:

>I think the duplicate status is wrong.

I agree, but then it's not a bug in python-apt. It's really a bug caused by
our old version of pip, which doesn't natively understand PEP 440 'arbitrary
equality' clauses signified by the === marker. Even if you change
python-apt's version number it's still possible that some other installed
package will have a nonconforming version number.

Upgrading pip to the latest version is an arduous process because of all the
bureaucracy involved (and a bit of technical prerequisites), but in any case,
with the help of the upstream maintainer, I did backport a workaround in pip
1.5.6-7 (seen in Ubuntu as 1.5.6-7ubuntu1). You'll need wily though.

>I did a sudo apt-get install -t wily python-apt to get 1.0.0~beta3.1ubuntu1
>which is the version which is supposed to fix the problem. However, pip
>freeze still fails.

`pip list` would also trigger the bug, but it should be fixed now, at least in
unstable and wily. I have an ongoing task to update pip to the latest
upstream release.

[Julian Andres Klode (juliank)]

If you guys want this to track the pip bug, then please unduplicate it, and drop the python-apt bug.

[Barry Warsaw (barry)]

On Aug 27, 2015, at 02:16 PM, Julian Andres Klode wrote:

>If you guys want this to track the pip bug, then please unduplicate it,
>and drop the python-apt bug.

There's no need, it's already fixed.

[Muelli (ubuntu-bugs-auftrags-killer)]

On Thu, Aug 27, 2015 at 02:36:19PM -0000, Barry Warsaw wrote:
> There's no need, it's already fixed.
I confirm that the wily version makes pip freeze work.
Will we see a fix in vivid?

[Barry Warsaw (barry)]

On Aug 27, 2015, at 02:55 PM, Muelli wrote:

>I confirm that the wily version makes pip freeze work.

Yay!

>Will we see a fix in vivid?

Unlikely unless someone provides a patch. I probably won't have time, and
vivid is not an LTS.