Public bug reported:
On both Bionic (EOL, yes, but applies to the packages available within
ESM also) and Focal, we found that the unbound package's prerm
maintainer script does not confirm whether the action is "remove" before
it stops the service, causing a service stop and unnecessary unbound
downtime on every upgrade. We were able to confirm the script looks
correct in Jammy.
At the top of the prerm script in both affected distro versions, it
first checks for the old SysV style init while also confirming the
action is "remove":
# Automatically added by dh_installinit/11.1.6ubuntu1
if [ -x "/etc/init.d/unbound" ] && [ "$1" = remove ]; then
invoke-rc.d unbound stop || true
fi
However, at the end of the script, when it confirms whether the system has
systemd running, it does not validate the action passed, so it stops the
service on every action where prerm is called:
# Automatically added by dh_systemd_start/11.1.6ubuntu1
if [ -d /run/systemd/system ]; then
deb-systemd-invoke stop 'unbound.service' >/dev/null || true
fi
Simply appending ' && [ "$1" = remove ]' to the systemd conditional should
resolve this issue.
It would then look like the following:
# Automatically added by dh_systemd_start/11.1.6ubuntu1
if [ -d /run/systemd/system ] && [ "$1" = remove ]; then
deb-systemd-invoke stop 'unbound.service' >/dev/null || true
fi
In the Jammy package, we see the prerm script looks correct, so it doesn't seem
like any change is needed there:
# Automatically added by dh_systemd_start/13.6ubuntu1
if [ -z "${DPKG_ROOT:-}" ] && [ "$1" = remove ] && [ -d /run/systemd/system
] ; then
deb-systemd-invoke stop 'unbound.service' >/dev/null || true
fi
** Affects: unbound (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2072700
Title:
[Bionic/Focal] Unbound prerm script stops the service on upgrades
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