postrm is in maas-rack-controller 2.4.0~beta2-6865-gec43e47e6-0ubuntu1.
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.
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set -e
# Automatically added by dh_installinit/11.1.6ubuntu1
if [ "$1" = "purge" ] ; then
	update-rc.d maas-rackd remove >/dev/null
fi
# In case this system is running systemd, we make systemd reload the unit files
# to pick up changes.
if [ -d /run/systemd/system ] ; then
	systemctl --system daemon-reload >/dev/null || true
fi
# End automatically added section
# Automatically added by dh_installdeb/11.1.6ubuntu1
dpkg-maintscript-helper rm_conffile /lib/systemd/system/maas-clusterd.service 2.0.0~alpha1+bzr4635-0ubuntu1 -- "$@"
# End automatically added section
# Automatically added by dh_installdeb/11.1.6ubuntu1
dpkg-maintscript-helper rm_conffile /etc/init/maas-clusterd.conf 2.0.0~alpha1+bzr4635-0ubuntu1 -- "$@"
# End automatically added section
# Automatically added by dh_installdeb/11.1.6ubuntu1
dpkg-maintscript-helper rm_conffile /etc/maas/maas-cluster-http.conf 1.8.0~alpha1+bzr3522-0ubuntu1 -- "$@"
# End automatically added section
# Automatically added by dh_installdeb/11.1.6ubuntu1
dpkg-maintscript-helper rm_conffile /etc/init/maas-cluster-register.conf 1.7.0~beta6+bzr3231-0ubuntu1 -- "$@"
# End automatically added section
# Automatically added by dh_installdeb/11.1.6ubuntu1
dpkg-maintscript-helper rm_conffile /etc/init/maas-cluster.conf 1.7.0~beta6+bzr3231-0ubuntu1 -- "$@"
# End automatically added section
# Automatically added by dh_installdeb/11.1.6ubuntu1
dpkg-maintscript-helper rm_conffile /etc/init/maas-pserv.conf 1.7.0~beta3+bzr3043-0ubuntu1 -- "$@"
# End automatically added section
# Automatically added by dh_installdeb/11.1.6ubuntu1
dpkg-maintscript-helper rm_conffile /etc/init/maas-cluster-celery.conf 1.7.0~beta3+bzr3043-0ubuntu1 -- "$@"
# End automatically added section
# Automatically added by dh_installdeb/11.1.6ubuntu1
dpkg-maintscript-helper rm_conffile /etc/maas/maas_local_celeryconfig_cluster.py 1.7.0~beta3+bzr3043-0ubuntu1 -- "$@"
# End automatically added section
# Automatically added by dh_installdeb/11.1.6ubuntu1
dpkg-maintscript-helper rm_conffile /etc/maas/bootresources.yaml 1.7.0~beta1+bzr2781-0ubuntu1 -- "$@"
# End automatically added section
# Automatically added by dh_systemd_start/11.1.6ubuntu1
if [ -d /run/systemd/system ]; then
	systemctl --system daemon-reload >/dev/null || true
fi
# End automatically added section
# Automatically added by dh_systemd_enable/11.1.6ubuntu1
if [ "$1" = "remove" ]; then
	if [ -x "/usr/bin/deb-systemd-helper" ]; then
		deb-systemd-helper mask 'maas-rackd.service' >/dev/null || true
	fi
fi
if [ "$1" = "purge" ]; then
	if [ -x "/usr/bin/deb-systemd-helper" ]; then
		deb-systemd-helper purge 'maas-rackd.service' >/dev/null || true
		deb-systemd-helper unmask 'maas-rackd.service' >/dev/null || true
	fi
fi
# End automatically added section
# Automatically added by dh_installdebconf/11.1.6ubuntu1
if [ "$1" = purge ] && [ -e /usr/share/debconf/confmodule ]; then
	. /usr/share/debconf/confmodule
	db_purge
fi
# End automatically added section
RELEASE=`lsb_release -rs` || RELEASE=""
case "$1" in
    purge)
        # remove logfile as it wasn't installed by packaging
        rm -rf /var/log/maas/rackd.log*
        # remove var directories provided it will always have files
        # not installed or tracked by packaging
        rm -rf /var/lib/maas/boot-resources
        # remove files that were created by the rack controller
        rm -rf /var/lib/maas/dhcpd.sock
        rm -rf /var/lib/maas/dhcpd.conf
        rm -rf /var/lib/maas/dhcpd-interfaces
        rm -rf /var/lib/maas/dhcpd6.conf
        rm -rf /var/lib/maas/dhcpd6-interfaces
        # Remove authbind
        MAAS_UID="`id -u maas`"
        if [ -f "/etc/authbind/byuid/$MAAS_UID" ]; then
            rm -rf /etc/authbind/byuid/$MAAS_UID
        fi
        # Remove rackd.conf file
        rm -rf /etc/maas/rackd.conf
        # Deleting old config files if they exist
        if [ -f /etc/maas/pserv.yaml.maas-old ]; then
            rm -rf /etc/maas/pserv.yaml.maas-old
        fi
        if [ -f /etc/maas/maas_cluster.conf.maas-old ]; then
            rm -rf /etc/maas/maas_cluster.conf.maas-old
        fi
        if [ -f /etc/maas/templates/dhcp.maas-old ]; then
            rm -rf /etc/maas/templates/dhcp.maas-old
        fi
esac
# Delete symlink for iSCSI config, it is no longer used.
if [ -L /etc/tgt/conf.d/maas.conf ]; then
    rm -rf /etc/tgt/conf.d/maas.conf
fi
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