apport python exception handler messes up python3.7

Bug #1774843 reported by Bart Goeman on 2018-06-03
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
apport (Ubuntu)
Medium
Unassigned
python-apt (Ubuntu)
Undecided
Unassigned

Bug Description

it seems apport installs an exception hook whenever running python3.
This hook is apparently installed for python3.7 too.
This exception handler has a dependency on apt_pkg, which is a binary that is not compatible with python3.7 it seems (you can't import it, see below)

As a result, whenever I run a python3.7 script and run into an exception (which happens often when writing code), I get an additional exception in the exception handler + a copy of the original exception, so three stacktraces in total.
A solution would be to only install the exception hook for the system python i.e. python3.6

$ lsb_release -rd
Description: Ubuntu 18.04 LTS
Release: 18.04

apport: 2.20.9-0ubuntu7
python-apt: 1.6.0
python3.7: 3.7.0~b3-1

Demo with a trivial error:
$ python3 -c 'print hello'
  File "<string>", line 1
    print hello
              ^
SyntaxError: Missing parentheses in call to 'print'. Did you mean print(hello)?

$ python3.7 -c 'print hello'
  File "<string>", line 1
    print hello
              ^
SyntaxError: Missing parentheses in call to 'print'. Did you mean print(hello)?
Error in sys.excepthook:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 63, in apport_excepthook
    from apport.fileutils import likely_packaged, get_recent_crashes
  File "/usr/lib/python3/dist-packages/apport/__init__.py", line 5, in <module>
    from apport.report import Report
  File "/usr/lib/python3/dist-packages/apport/report.py", line 30, in <module>
    import apport.fileutils
  File "/usr/lib/python3/dist-packages/apport/fileutils.py", line 23, in <module>
    from apport.packaging_impl import impl as packaging
  File "/usr/lib/python3/dist-packages/apport/packaging_impl.py", line 24, in <module>
    import apt
  File "/usr/lib/python3/dist-packages/apt/__init__.py", line 23, in <module>
    import apt_pkg
ModuleNotFoundError: No module named 'apt_pkg'

Original exception was:
  File "<string>", line 1
    print hello
              ^
SyntaxError: Missing parentheses in call to 'print'. Did you mean print(hello)?

Python 3.6.5 (default, Apr 1 2018, 05:46:30)
[GCC 7.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> sys.excepthook
<function apport_excepthook at 0x7fdf2b99a620>
>>> import apt_pkg
>>> apt_pkg.__file__
'/usr/lib/python3/dist-packages/apt_pkg.cpython-36m-x86_64-linux-gnu.so'
>>>

Python 3.7.0b3 (default, Mar 30 2018, 04:35:22)
[GCC 7.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> sys.excepthook
<function apport_excepthook at 0x7f29a6eebea0>
>> import apt_pkg
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'apt_pkg'

Julian Andres Klode (juliank) wrote :

python 3.7 is not a supported version, hence modules are not built for it.

Changed in python-apt (Ubuntu):
status: New → Invalid
Julian Andres Klode (juliank) wrote :

So apport needs to catch the exception and do nothing / not register an excepthook on unsupported python versions.

Bart Goeman (bgoeman) wrote :

well my reasoning was slightly different from supported/unsupported
i am not familiar with the exact scope of the apport project,
but I assume the goal is to collect info on ubuntu packages, not any unrelated code,
and since afaik all packages one one release all use the same (system) python version( i.e. 3.6 for bionic),
-> code running under any other python is of no interest anyhow
-> it only makes sense to install the apport exception hook for that python version,

Changed in apport (Ubuntu):
status: New → Triaged
importance: Undecided → Medium
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