Public bug reported:
[Impact]
The switch to frontend locking in 1.2.28/1.6.5/1.7~ caused scripts registered in
DPkg::Pre-Install-Pkgs
DPkg::Pre-Invoke
DPkg::Post-Invoke
To be run with the frontend lock held. This caused problems with some
installer packages like libdvd-pkg which install a locally built package
in such a hook.
To reduce the impact, a fix has been applied in 1.7.0 which exports the
DPKG_FRONTEND_LOCKED variable when running those scripts, allowing dpkg
to be run from those scripts.
[Test case]
Make sure that the test-frontend-lock test run by autopkgtest succeeds. This
checks that:
(1) the variable is correctly exported to those scripts
(2) the frontend lock is still held
(3) dpkg can be run from the post-invoke script
[Regression potential]
Depending on the script (for example, if the script starts a daemon manually or
something like that), DPKG_FRONTEND_LOCKED might leak to other processes which
might survive the apt call and thus revert surviving process to not using
frontend locking.
[Other info]
This fix is for backwards compatibility only. Starting with the dd cycle, it
will be dropped for the Pre-Install-Pkgs and Pre-Invoke scripts. Potentially
for post-invoke as well, if we find a better solution for it.
** Affects: apt (Ubuntu)
Importance: Undecided
Status: Fix Released
** Affects: apt (Ubuntu Xenial)
Importance: Undecided
Status: Triaged
** Affects: apt (Ubuntu Bionic)
Importance: Undecided
Status: Triaged
** Affects: apt (Ubuntu Cosmic)
Importance: Undecided
Status: Fix Released
** Also affects: apt (Ubuntu Cosmic)
Importance: Undecided
Status: New
** Also affects: apt (Ubuntu Bionic)
Importance: Undecided
Status: New
** Also affects: apt (Ubuntu Xenial)
Importance: Undecided
Status: New
** Changed in: apt (Ubuntu Xenial)
Status: New => Triaged
** Changed in: apt (Ubuntu Bionic)
Status: New => Triaged
** Changed in: apt (Ubuntu Cosmic)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1796808
Title:
frontend locking regression: dpkg::post-invoke scripts can't install
packages
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