apache module postinst/prerm scripts

["Massimo Manghi" <mxmanghi@apache.org>]

Hi 

I'm returning on to the problem of properly dealing with postinst/prerm
scripts of an Apache module package. 

I shaped the postinst/prerm for libapache2-mod-rivet following the template
shown on the wiki. 
The postinst script work well if one installs the package, then purge it 
and reinstalls it later on.

   if [ "$1" = configure ] ; then
       # only enable on new installs, not on upgrades
       if [ -z "$2" ] ; then
           a2enmod -q something
       fi
       # only restart if mod_something is enabled
       if [ -e /etc/apache2/mods-enabled/something.load ] ; then
           invoke-rc.d apache2 restart
       fi
   fi

when the $2 arguments is defined it is assumed the operation is an 
upgrade and a2enmod is not called. The $2 arguments is not only set 
during upgrades though, but also when reinstalling 
the package after a 'dpkg --remove <package-name>'. 

In fact the prerm on the wiki is

  if [ "$1" = remove ] ; then
       a2dismod -q -f something || true
       invoke-rc.d apache2 restart
   fi

So, after a remove and subsequent install the package is disabled because 
the symlinks from mods-enabled to mods-available are missing. I'm not 
sure I if I got it right, but it seems to me the checks on the arguments 
have to be changed, perhaps reenabling the module anyway under
specific conditions (new-version == old-version ?). Any suggestion?

-- Massimo