** Tags added: regression-update
** Changed in: python-apt (Ubuntu Xenial)
Status: Triaged => In Progress
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https://bugs.launchpad.net/bugs/1830635
Title:
Regression: xenial: Uses apt_pkg.Error, which is only available in
later versions
Status in python-apt package in Ubuntu:
Invalid
Status in python-apt source package in Xenial:
In Progress
Bug description:
[Impact]
The last SRU introduced a regression in error handling, where apt_pkg.Error
is being caught - but that class is not available in xenial - it still uses
SystemError
[Test case]
Run python3 -c "import apt; apt.Cache().update()" while running apt
update.
You should see:
# <command>
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/usr/lib/python2.7/dist-packages/apt/cache.py", line 468, in update
raise LockFailedException("Failed to lock %s" % lockfile)
apt.cache.LockFailedException: Failed to lock /var/lib/apt/lists/lock
Currently you see:
# <command>
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/apt/cache.py", line 63, in __enter__
return self._lock.__enter__()
SystemError: E:Could not get lock /var/lib/apt/lists/lock - open (11:
Resource temporarily unavailable)
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/usr/lib/python3/dist-packages/apt/cache.py", line 481, in update
with _WrappedLock(apt_pkg.config.find_dir("Dir::State::Lists")):
File "/usr/lib/python3/dist-packages/apt/cache.py", line 64, in __enter__
except apt_pkg.Error as e:
AttributeError: module 'apt_pkg' has no attribute 'Error'
[Regression potential]
It really can't get worse than this. But FWIW: This only affects code paths
where we could not lock the lists/ or archives/ directory - they currently
throw the AttributeError, and will then throw LockFailedException again - as
they did before the SRU.
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