postinst is in perdition-mysql 2.2-3ubuntu2.
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  | #! /bin/sh
# postinst script for perdition-ldap
set -e
if [ "$1" = "configure" ]; then
	if [ -f /etc/init.d/perdition ]; then
		invoke-rc.d perdition stop
	fi
	if [ -f /etc/init.d/perdition ]; then
		invoke-rc.d perdition start
	fi
fi
exit 0
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