** Description changed:
+ [Impact]
+ python-apt 1.6 raises an exception when objects of an old cache are passed to
a apt_pkg.DepCache methods for a different cache. Prior to that, those would
either segfault, succeed, or silently operate on a different object, as they
use package/version ids, and e.g. two different packages in the old and new
cache might have the same id.
+
+ With 1.6.1, we introduce a remapping algorithm that remaps objects of
+ apt.Cache() when calling apt.Cache.open(), allowing old objects to be
+ used after reopening, as long as they exist in the new cache. If they
+ don't exist in the new cache, apt_pkg.CacheMismatchError will be raised
+ from the apt_pkg layer.
+
+ [Test case]
+ import apt
+ c=apt.Cache()
+ p=c["apt"]
+ c.open()
+ p.mark_install()
+
+ [Regression potential]
+ Could be remapping to wrong items which would cause us to install a wrong
version, for example. Compared to pre-bionic, bionic is a regression already,
though, and any regression caused here is less important than
+ what we have now.
+
+ [Original bug report]
The Ubuntu Error Tracker has been receiving reports about a problem regarding
update-manager. This problem was most recently seen with package version
1:18.04.11, the problem page at
https://errors.ubuntu.com/problem/e6ff7b5c385c512b7933497ad895c8a19ed063b2
contains more details, including versions of packages affected, stacktrace or
traceback, and individual crash reports.
If you do not have access to the Ubuntu Error Tracker and are a software
developer, you can request it at http://forms.canonical.com/reports/.
** Changed in: update-manager (Ubuntu Bionic)
Status: Confirmed => Triaged
** Changed in: update-manager (Ubuntu Bionic)
Status: Triaged => Won't Fix
** Changed in: update-manager (Ubuntu Cosmic)
Status: Confirmed => Won't Fix
** Changed in: python-apt (Ubuntu Cosmic)
Status: Confirmed => Fix Committed
** Changed in: python-apt (Ubuntu Bionic)
Status: Confirmed => Triaged
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https://bugs.launchpad.net/bugs/1773316
Title:
Object of different cache passed as argument to apt_pkg.DepCache
method
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