David, On Tuesday, January 21, 2025 10:56:31 AM MST David Kalnischkies wrote: > Am Mon, Jan 20, 2025 at 02:58:21PM -0700, schrieb Soren Stoutner: > > if [[ `dpkg-divert --list courier-mta` ]]; then > > [[ is a bashism (see checkbashisms from devscripts), so I wonder a bit > how that worked for you in testing and why lintian and co haven't > screamed at you. > > You can see the call fail e.g. in piuparts: > https://piuparts.debian.org/sid/pass/courier-mta_1.3.13-4.log > > | /var/lib/dpkg/info/courier-mta.postinst: 23: [[: not found > > (It doesn't fail the script, as using an unknown binary like > this is technically the same as writing `if false; then`)
Thanks for catching that. I always run piuparts and lintian locally when
building a
package. Indeed, piuparts does flag the [[, but it still exits successfully
(as can be seen in
the log you linked to).
Lintian also flagged it, but I missed it when I scanned through all of the
linitan warnings.
This particular package has a large number of lintian problems, which is going
to take me
several years to cleanup after salvaging the package. Having so many warnings
sometimes makes it difficult to notice when a recent change adds a new one.
> You can write this line in (da)sh compatible way e.g. so:
> | if [ -n "$(dpkg-divert --list courier-mta)" ]; then
>
> (Realising that [ is not syntax but an actual command name
> might help in understanding why [[ is not bad syntax either)
>
> > One of the advantages of using this check instead of a package version
> > number
> > is that it can be tested on a machine by manually creating diversions and
> > then running the script to see if it removes them, which is how I caught
> > the problem.
>
> Well, given a version check is done via parameter $2 to the maintainer
> script (see d-policy) I suppose testing this is equally hard… as it is
> mostly about how you call it (did you call it with
> bash courier-mta.postinst configure 1.3.13-4
> perhaps?) correctly and in the same way it would be called in various
> situations by dpkg which is the non-trivial part that e.g. piuparts
> is supposed to help you with by testing various scenarios.
I ran a number of routines on my local system, creating various diversions and
see the
results when running the logic of this part of the script against them, which,
unfortunately, was running under . . . bash. So, it liked the previous version
of the script
just fine.
Thanks again for catching this. I would have eventually have noticed the
lintian warning
as I read over those frequently. But I am sure users will appreciate having
this fix sooner.
So, for clarity of documentation in case anyone stumbles across this thread and
needs to
do something similar in the future.
# Delete the old diversions if they exist, which are no longer needed.
# These commands can be removed in trixie +1.
# See <https://github.com/svarshavchik/courier/issues/56>
# See also <https://lists.debian.org/debian-mentors/2025/01/msg00219.html>
if [ -n "$(dpkg-divert --list courier-mta)" ]; then
dpkg-divert --package courier-mta --remove --rename \
--divert /usr/bin/addcr.ucspi-tcp /usr/bin/addcr
dpkg-divert --package courier-mta --remove --rename \
--divert /usr/share/man/man1/addcr.ucspi-tcp.1.gz
/usr/share/man/man1/addcr.
1.gz
fi
https://salsa.debian.org/debian/courier/-/blob/
1ec1938107a9529d9febd4a4a05c8e89e347148c/debian/courier-mta.postinst#L19
--
Soren Stoutner
[email protected]
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