In the Debian postinst there is a case clause at the end whose purpose
is to enable updates. In Debian this is done by means of a trigger.
----------------resolvconf 1.77 ----------------
[...]
case "$1" in
reconfigure)
resolvconf --enable-updates
;;
configure)
if [ "$DEBCONF_RECONFIGURE" = 1 ] ; then
resolvconf --enable-updates
else
# Trigger self to enable updates later
dpkg-trigger --no-await resolvconf-enable-updates || resolvconf
--enable-updates
fi
;;
triggered)
# Runs after this and other packages have been configured
for trggr in $2 ; do
case "$trggr" in
resolvconf-enable-updates)
resolvconf --enable-updates
break
;;
esac
done
;;
[...]
--------------------------------
The Ubuntu postinst omits that whole clause. In the Upstart era updates
were enabled by means of an "invoke-rc.d resolvconf start" at the end of
the file, inserted by dh_installinit called without "--no-start".
--------------- resolvconf 1.69ubuntu1 -----------------
[...]
# Automatically added by dh_installinit
if [ -x "/etc/init.d/resolvconf" ]; then
if [ ! -e "/etc/init/resolvconf.conf" ]; then
update-rc.d resolvconf defaults >/dev/null
fi
invoke-rc.d resolvconf start || exit $?
fi
# End automatically added section
# Automatically added by dh_installinit
update-rc.d -f resolvconf remove >/dev/null || exit $?
# End automatically added section
exit 0
--------------------------------
I would suggest that Ubuntu resolvconf's postinst simply add a clause at
the end, like the one in Debian, which runs "resolvconf --enable-
updates" on configure. This will minimize the diff with the Debian
postinst.
For background on the sorts of problems that can arise when changes are
made to the postinst that haven't been fully thought through, see bug
#1085862.
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https://bugs.launchpad.net/bugs/1453185
Title:
resolvconf: updates are not enabled right after installation
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