postinst is in libapache2-mod-rivet 2.2.4-1.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 | #!/bin/sh
# postinst script for libapache2-mod-rivet
#
# see: dh_installdeb(1)
set -e
# summary of how this script can be called:
#        * <postinst> `configure' <most-recently-configured-version>
#        * <old-postinst> `abort-upgrade' <new version>
#        * <conflictor's-postinst> `abort-remove' `in-favour' <package>
#          <new-version>
#        * <postinst> `abort-remove'
#        * <deconfigured's-postinst> `abort-deconfigure' `in-favour'
#          <failed-install-package> <version> `removing'
#          <conflicting-package> <version>
# for details, see http://www.debian.org/doc/debian-policy/ or
# the debian-policy package
APACHE2CONF="/etc/apache2/"
case "$1" in
    configure)
	if [ -z "$2" ] ; then
# enabling the module. This code was largely taken from 
# http://wiki.debian.org/Apache/PackagingFor24.
	    if [ -e /usr/share/apache2/apache2-maintscript-helper ] ; then
		. /usr/share/apache2/apache2-maintscript-helper
		# mod_rivet requires the prefork MPM
		if [ $(a2query -M) != 'prefork' ] ; then
		    apache2_msg notice "attempting to enable Apache2 prefork mpm"
		    if apache2_switch_mpm prefork ; then
			apache2_invoke enmod rivet
		    else
			apache2_msg err "Could not switch to prefork, not enabling mod_rivet"
		    fi
		else
		    apache2_invoke enmod rivet
		fi
	    fi
       fi
    ;;
    abort-upgrade|abort-remove|abort-deconfigure)
    ;;
    *)
        echo "postinst called with unknown argument \`$1'" >&2
        exit 1
    ;;
esac
# dh_installdeb will replace this with shell code automatically
# generated by other debhelper scripts.
# Automatically added by dh_apache2
if true; then
	if [ -e /usr/share/apache2/apache2-maintscript-helper ] ; then
		. /usr/share/apache2/apache2-maintscript-helper
		for conf in rivet  ; do
			apache2_invoke enmod $conf  || exit $?
		done
	fi
fi
# End automatically added section
exit 0
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