Bug#229715: apt: Add a "postinst command spool"

[Agustin Martin Domingo <agustin.martin@hispalinux.es>]

Goswin von Brederlow wrote:
> Scheduling something to be run just once in an install/upgrade session
> is quite complicated currently. A clean and common mechanism for it
> would be nice. I was looking for that just last week.

I was thinking about something for the LaTeX packages, where texhash or 
its equivalent is run by each package postinst, when running it once at 
the very end would be enough

An quick, unsafe and dirty approach:

postinst:

echo "texhash" > /var/lib/dpkg/hooks/texhash.postinst

for each package requiring the TeX database to be updated.

dpkg doing, after running maintainer scripts, something like

$postinst_hooks=the list of postinst hooks
for i in $postinst_hooks; do
  sh $i && rm $i
done

To be safer not everything should be allowed as a hook, having 
pre-defined hooks somewhere and allowing only to run them, and probably 
many other things should be done to make it really work.

Cheers,

--
Agustin