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classification
Title: ensurepip raises TypeError after pip uninstall
Type: crash Stage:
Components: Library (Lib) Versions: Python 2.7
process
Status: closed Resolution: third party
Dependencies: Superseder:
Assigned To: Nosy List: dstufft, jayvdb, ncoghlan, ned.deily, petr.viktorin
Priority: normal Keywords:

Created on 2016-09-01 03:02 by jayvdb, last changed 2022-04-11 14:58 by admin. This issue is now closed.

Messages (6)
msg274089 - (view) Author: John Mark Vandenberg (jayvdb) * Date: 2016-09-01 03:02 
After uninstalling pip on Fedora 24, ensurepip get_records_to_pack returns None, causing rewheel.rewheel_from_record to raise TypeError: 'NoneType' object is not iterable.

While this is probably not a scenario that CPython supports directly, it would be nice if it handled it a bit better.

Presumably this is using the system python-pip 8.1.0, while there is another pip present, and it is uninstalling both pip 7.1.2 and 8.1.0 at the same time.

$ sudo pip uninstall pip
Uninstalling pip-7.1.2:
  /usr/bin/pip
  /usr/bin/pip2
  /usr/bin/pip2.7
  /usr/lib/python2.7/site-packages/pip-7.1.2.dist-info/DESCRIPTION.rst
  /usr/lib/python2.7/site-packages/pip-7.1.2.dist-info/METADATA
  /usr/lib/python2.7/site-packages/pip-7.1.2.dist-info/RECORD
  /usr/lib/python2.7/site-packages/pip-7.1.2.dist-info/WHEEL
  /usr/lib/python2.7/site-packages/pip-7.1.2.dist-info/entry_points.txt
  /usr/lib/python2.7/site-packages/pip-7.1.2.dist-info/metadata.json
  /usr/lib/python2.7/site-packages/pip-7.1.2.dist-info/pbr.json
  /usr/lib/python2.7/site-packages/pip-7.1.2.dist-info/top_level.txt
  /usr/lib/python2.7/site-packages/pip/__init__.py
  /usr/lib/python2.7/site-packages/pip/__init__.pyc
  /usr/lib/python2.7/site-packages/pip/__main__.py
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Proceed (y/n)? y
  Successfully uninstalled pip-7.1.2
You are using pip version 8.1.0, however version 8.1.2 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.

$ sudo python -m pip uninstall pip
/bin/python: No module named pip

$ sudo python -m ensurepip
Traceback (most recent call last):
  File "/usr/lib64/python2.7/runpy.py", line 174, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/usr/lib64/python2.7/runpy.py", line 72, in _run_code
    exec code in run_globals
  File "/usr/lib64/python2.7/ensurepip/__main__.py", line 4, in <module>
    ensurepip._main()
  File "/usr/lib64/python2.7/ensurepip/__init__.py", line 248, in _main
    default_pip=args.default_pip,
  File "/usr/lib64/python2.7/ensurepip/__init__.py", line 110, in bootstrap
    new_whl = rewheel.rewheel_from_record(dr, rewheel_dir)
  File "/usr/lib64/python2.7/ensurepip/rewheel/__init__.py", line 75, in rewheel_from_record
    to_write, to_omit = get_records_to_pack(site_dir, record_relpath)
TypeError: 'NoneType' object is not iterable

$ python --version
Python 2.7.12
$ dnf info python-pip
Installed Packages
Name        : python-pip
Arch        : noarch
Epoch       : 0
Version     : 8.0.2
Release     : 1.fc24
Size        : 7.1 M
Repo        : @System
Summary     : A tool for installing and managing Python packages
URL         : http://www.pip-installer.org
License     : MIT
Description : Pip is a replacement for `easy_install
            : <http://peak.telecommunity.com/DevCenter/EasyInstall>`_.  It uses mostly the
            : same techniques for finding packages, so packages that were made
            : easy_installable should be pip-installable as well.
msg274090 - (view) Author: Ned Deily (ned.deily) * (Python committer) Date: 2016-09-01 03:21 
You used "pip uninstall" to uninstall the Fedora-supplied pip (/usr/bin/pip)?  That would be a really *bad* thing to do.  And does Fedora supply a modified ensurepip / pip?  What happens if you try this with a vanilla Python 3.5.x built from source?  My initial reaction is that there is nothing Python can do about this and probably not pip either.
msg274091 - (view) Author: Ned Deily (ned.deily) * (Python committer) Date: 2016-09-01 03:28 
Sorry, 2.7.12 built from source.
msg274093 - (view) Author: John Mark Vandenberg (jayvdb) * Date: 2016-09-01 04:15 
Well, it wasnt my intention to remove the vendor package.  There were two versions, and I assume it would remove the older package which wasnt supplied by the vendor, but it removed both.

Anyways, I see that most of the code path is in https://github.com/fedora-python/rewheel/blob/master/python2-ensurepip-rewheel.patch#L36

I guess there isnt much the cpython module can do here.
msg274096 - (view) Author: Donald Stufft (dstufft) * (Python committer) Date: 2016-09-01 05:22 
rewheel is definitely some Fedora patches.
msg274097 - (view) Author: Nick Coghlan (ncoghlan) * (Python committer) Date: 2016-09-01 05:44 
Yeah, this is a known problem with pip where if you run it with sudo, it will happily uninstall system managed files from the system Python.

To fix your system (if you haven't already):

    $ sudo dnf reinstall python2-pip

(Anyone that accidentally uninstalls one of DNF's dependencies is in for a world of pain, but fortunately for this case pip doesn't fall into that category)

For the actual "pip currently happily uninstalls distro packages when run with sudo" problem, https://mail.python.org/pipermail/distutils-sig/2016-January/028080.html is the most recent discussion of that situation.

So we have a basic concept in place for how to make "sudo pip uninstall" less dangerous, it just requires coordination between PyPA updates to pip and downstream distro packaging policies to get us there.
History
Date User Action Args
2022-04-11 14:58:35adminsetgithub: 72111
2016-09-01 05:44:52ncoghlansetnosy: + petr.viktorin
messages: + msg274097
2016-09-01 05:22:03dstufftsetmessages: + msg274096
2016-09-01 04:15:18jayvdbsetstatus: open -> closed
resolution: third party
messages: + msg274093
2016-09-01 03:28:08ned.deilysetmessages: + msg274091
2016-09-01 03:21:27ned.deilysetnosy: + ncoghlan, dstufft
2016-09-01 03:21:15ned.deilysetnosy: + ned.deily
messages: + msg274090
2016-09-01 03:02:56jayvdbcreate