Public bug reported:
[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.
** Affects: apt (Ubuntu)
Importance: Undecided
Status: Triaged
** Affects: apt (Ubuntu Bionic)
Importance: Undecided
Status: Triaged
** Affects: apt (Ubuntu Focal)
Importance: Undecided
Status: Triaged
** Affects: apt (Ubuntu Groovy)
Importance: Undecided
Status: Triaged
** Affects: apt (Ubuntu Hirsute)
Importance: Undecided
Status: Triaged
** Description changed:
[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]
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.
+ 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.
** Also affects: apt (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: apt (Ubuntu Hirsute)
Importance: Undecided
Status: New
** Also affects: apt (Ubuntu Groovy)
Importance: Undecided
Status: New
** Also affects: apt (Ubuntu Bionic)
Importance: Undecided
Status: New
** Changed in: apt (Ubuntu Hirsute)
Status: New => Triaged
** Changed in: apt (Ubuntu Groovy)
Status: New => Incomplete
** Changed in: apt (Ubuntu Groovy)
Status: Incomplete => Triaged
** Changed in: apt (Ubuntu Focal)
Status: New => Triaged
** Changed in: apt (Ubuntu Bionic)
Status: New => Triaged
** Description changed:
[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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https://bugs.launchpad.net/bugs/1916725
Title:
Protected/Important packages are not deconfigured, require Force-
LoopBreak
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