Roger Leigh <[EMAIL PROTECTED]> writes:
> Thomas Hood <[EMAIL PROTECTED]> writes:
>
>> Roger Leigh wrote:
>>> Until last month, dpkg "forgot" about conffiles which were removed or
>>> moved on package upgrade. As a consequence, maintainers had to
>>> remember to purge these conffiles "by hand" in the package postrm
>>> script.
>>
>> I just want to highlight the word "these" above in order to reduce the
>> possibility of confusion.
>>
>> Postrms should not delete files that are currently conffiles of the package.
>> dpkg takes care of deleting such files at the right time.
>>
>> If a file /etc/foo was formerly a conffile of the package but no
>> longer is so then /etc/foo should be dealt with in the preinst or
>> postinst. ("Dealing with it" has to take into account both the old
>> and the new behavior of dpkg with respect to disappearing conffiles.
>> I speak vaguely here because I haven't looked into the new
>> behavior.) If it isn't dealt with there then it might be
>> appropriate to delete it in the postrm, but not if there is reason
>> to suspect that some other package is now using /etc/foo.
>
> How about this as a start?
>
> This should be "safe" in that it won't remove a conffile if another
> package (or itself) takes ownership of it. It also handles removal of
> the dpkg cruft, but I'm not sure that's always appropriate, since dpkg
> should handle it, at least for the new dpkg behaviour; this only
> caters for the old.
>
> Call in a postrm like this:
> rm_conffile("/etc/my/conffile")
This updated version should cater for both the old and new behaviour.
Any comments?
# Remove a conffile which has been forgotten by dpkg
# If the file does not exist, or is owned by any package, do not remove it.
rm_conffile() {
CONFFILE="$1"
if [ -f "$CONFFILE" ]; then
local delete="false"
local fpkg=""
local pkg=""
if fpkg=$(dpkg -S "$CONFFILE" 2>/dev/null); then
# Don't delete, but check which package it came from.
pkg=$(echo $fpkg | sed -e 's/\(^[[:print:]][[:print:]]*\):
.*$/\1/')
if [ "$pkg" = "$PACKAGE" ]; then
delete="true"
fi
else
rm -f "$CONFFILE"
delete="true"
fi
# Remove dpkg cruft
if [ "$delete" = "true" ]; then
rm -f "${CONFFILE}.dpkg-old"
rm -f "${CONFFILE}.dpkg-new"
rm -f "${CONFFILE}.dpkg-dist"
fi
fi
}
--
Roger Leigh
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