Re: Taking over conffiles from other packages while cleaning up properly [Re: Problems detected: package initscripts left obsolete init.d script behind]
On Wed, 08 Feb 2012, Michael Biebl wrote:
> As mentioned, a simple Replaces in the newly split-off package is
> not sufficient, as you will have obsolete conffiles, in case the new
> split-off package is not installed.
> I've seen this problem a couple of times and I thought it would be
> worthwile getting a best practice for this case documented.
Thinking a bit more about it could be handled with a conditional
dpkg-maintscript-helper rm_conffile that verifies who owns the file
currently.
preinst:
if out=$(dpkg-query --search $CONF 2>/dev/null); then
pkg=$(echo "$out" | sed -s 's/: .*//')
if [ "$pkg" = "sysvinit-utils" ]; then
dpkg-maintscript-helper rm_conffile $CONF <version> sysvinit-utils -- "$@"
fi
fi
and you're doing the same in postinst and postrm except that in postinst
you extend it to deal with the case where the command was initiated but
not completed (this is a layer violation and thus this whole logic should
be integrated in dpkg-maintscript-helper itself).
postinst:
if out=$(dpkg-query --search $CONF 2>/dev/null); then
pkg=$(echo "$out" | sed -s 's/: .*//')
if [ "$pkg" = "sysvinit-utils" ]; then
dpkg-maintscript-helper rm_conffile $CONF <version> sysvinit-utils -- "$@"
else
if [ -e $CONF.dpkg-remove ]; then
rm $CONF.dpkg-remove
fi
if [ -e $CONF.dpkg-backup ]; then
# XXX: we could also want to replace $CONF to reinstate the
# modified conffile
mv $CONF.dpkg-backup $CONF.dpkg-bak
fi
fi
fi
This needs some tests of course and should ideally be integrated in
dpkg-maintscript-helper as a separate command (rm_conffile_if_owner).
There are also some edge cases that require some attention (like the
fact that the output of dpkg-query --search on diverted file takes several
lines).
Cheers,
--
Raphaël Hertzog ◈ Debian Developer
Pre-order a copy of the Debian Administrator's Handbook and help
liberate it: http://debian-handbook.info/liberation/
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