Public bug reported:
I have package A that activated trigger and package B which should be
reconfigured when trigger is activated (listens for trigger). Trigger is
activated by postinst script in package A by using `dpkg-trigger my-
trigger`.
After looking into source code (/usr/sbin/dpkg-reconfigure), I can see
that problem is in method triggers_pending from line 201-206. What
happens is that variable $triggers will contain additional space at the
end of line (not present in 16.04) and so it will satisfy condition on
line 205.
So what happens is following?
1. When dpkg-reconfigure is executed, triggers_pending is called to get
information about packages with pending triggers
2. Because of bug, every package will be put into list (packages without
pending triggers)
3. At the end, dpkg-reconfigure will call again triggers_pending() and will
check of new packages that have pending triggers. But because all packages are
on original list, no change is detected and none of pending packages is
(re-)configured. This leave original package in trigger-pending state.
How to reproduce?
1. Create package A, and it's postinst script call 'dpkg-trigger A-my-trigger'
2. Create package B, that listens for 'A-my-trigger'
3. Install both packages
4. Do: dpkg-reconfigure A
5. Package A will be left broken and no reconfigure step will be executed for
package B
How to fix?
Well, I replaced /usr/sbin/dpkg-reconfigure: if (length $triggers) {
with: if ($triggers !~ /^\s*$/) {
and this solved the problem, except that it introduced additional
problem:
My package A does not use debconf for querying parameters and package B
does. But because dpkg-reconfigure messes with DEBIAN_HAS_FRONTEND
environment variable, the frontend is not started, but instead db_get
questions are posted on console (to user) and reconfiguration is halted.
Currently, I don't know enough debconf system in order to provide
solution for this.
** Affects: debconf (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1594457
Title:
dpkg-reconfigure does not process manually activated triggers
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