Hi!
On Wed, 2014-01-15 at 16:40:16 -0800, Steve Langasek wrote:
> On Thu, Nov 07, 2013 at 03:37:26PM +0100, Guillem Jover wrote:
> > dpkg 1.17.2 will setup DPKG_MAINTSCRIPT_PACKAGE_REFCOUNT to make this
> > easier to handle. The aforementioned thread contains recipes on how to
> > do proper ref-counting with older dpkg versions.
>
> Thanks for implementing this, Guillem.
No problem!
> I've had a chance to look at using this now in the libpam-cracklib prerm, to
> fix bug #647428. Since dpkg 1.17.2 is newer than what's available in
> wheezy, we need to decide on appropriate upgrade handling.
(Your changelog has a typo for the dpkg variable.)
> Rather than enforcing a versioned dep on dpkg (>= 1.17.2), which gets in the
> way of backports etc., I opted for the following pattern:
>
> if [ "$1" = remove ] && [ "${DPKG_MAINTSCRIPT_PACKAGE_REFCOUNT:-1}" = 1 ];
> then
> pam-auth-update --package --remove cracklib
> fi
>
> This will still be buggy when called from an older dpkg, but since this is a
> removal script that will only be in jessie, it's unlikely to be called until
> after dpkg has been upgraded. And if it is called from an older dpkg, it
> will fall back to the previous (recoverable) behavior.
As mentioned in the quoted text, the previous thread on this contains
a recipe to handle older dpkg versions, something like this could do:
# dpkg-query -f '${db:Status-Abbrev} ${binary:Package}\n' -W pkgname | \
grep -v '^.n' | wc -l
which could be used to set DPKG_MAINTSCRIPT_PACKAGE_REFCOUNT if not
already set.
Thanks,
Guillem
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