postrm is in cfengine2 2.2.10-5build1.
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 | #! /bin/sh
set -e
VDIR=/var/lib/cfengine2
if [ "$1" = "purge" ]; then
    if [ -d "$VDIR" ]; then
	cd "$VDIR"
	find . -mindepth 1 -maxdepth 1 \
	    -name inputs -prune -o -print0 | xargs -0r rm -rf
	cd /; rmdir "$VDIR"
    fi
    rm -f /etc/default/cfengine2
fi
# Automatically added by dh_installinit
if [ "$1" = "purge" ] ; then
	update-rc.d cfengine2 remove >/dev/null
fi
# In case this system is running systemd, we make systemd reload the unit files
# to pick up changes.
if [ -d /run/systemd/system ] ; then
	systemctl --system daemon-reload >/dev/null || true
fi
# End automatically added section
# Automatically added by dh_installdebconf
if [ "$1" = purge ] && [ -e /usr/share/debconf/confmodule ]; then
	. /usr/share/debconf/confmodule
	db_purge
fi
# End automatically added section
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