** Changed in: apt (Ubuntu Groovy)
Status: Triaged => In Progress
** Changed in: apt (Ubuntu Hirsute)
Status: Triaged => Fix Released
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https://bugs.launchpad.net/bugs/1916725
Title:
Protected/Important packages are not deconfigured, require Force-
LoopBreak
Status in apt package in Ubuntu:
Fix Released
Status in apt source package in Bionic:
Triaged
Status in apt source package in Focal:
Triaged
Status in apt source package in Groovy:
In Progress
Status in apt source package in Hirsute:
Fix Released
Bug description:
[Impact]
If a package that is Protected: yes (or Important: yes), or one of it's
dependencies, is involved in a dependency loop with Breaks, APT requires
APT::Force-LoopBreak instead of resolving the situation directly.
[Test plan]
Run the integration test suite (the autopkgtest) :)
Our test suite covers the tests for both Breaks and Conflicts.
Breaks:
protected-sysvinit (= 1) without dependencies is installed
protected-sysvinit (= 2) Pre-Depends protected-systemd-sysv
protected-systemd-sysv (= 2) Breaks: protected-sysvinit (<< 2)
Test: Install protected-sysvinit (= 2)
Expected result: Unpacking protected-sysvinit (= 2) deconfigures
protected-sysvinit (= 1), and then we unpack and configure protected-sysvinit
(= 2) and end up with a working system.
Conflicts: As for Breaks, but the Conflicts will remove the package
temporarily, requiring the use of APT::Force-LoopBreak option.
[Where problems could occur]
We now allow dpkg to automatically deconfigure protected packages. This
should just make them behave like normal packages to APT's eye, but bugs I
guess could occur somewhere in the APT/dpkg interaction (this only applies to
releases with Protected support in dpkg, Important is not affected, it's always
been "normal" for dpkg).
During development, we accidentally simplified the patch so much that
Conflicts did not require Force-LoopBreak for temporary removal. We
fixed that, but it points out that there is a place where the loop
break check happens that is a potential regression place.
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