This file is indexed.

postrm is in dovecot-core 1:2.2.22-1ubuntu2.

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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#!/bin/sh
set -e

if [ "$1" = "purge" ] ; then
	for conffile in `ucfq --with-colons dovecot-core | cut -d: -f1`; do
		# we mimic dpkg as closely as possible, so we remove configuration
		# files with dpkg backup extensions too:
		### Some of the following is from Tore Anderson:
		for ext in '~' '%' .bak .dpkg-tmp .dpkg-new .dpkg-old .dpkg-dist .ucf-new .ucf-old .ucf-dist;  do
			rm -f $conffile$ext
		done
		# remove the configuration file itself
		rm -f $conffile
		# and finally clear it out from the ucf database
		if which ucf >/dev/null; then
			ucf --purge $conffile
		fi
		if which ucfr >/dev/null; then
			ucfr --purge dovecot-core $conffile
		fi
	done

	# Remove 10-ssl.conf, which is not registered with ucf
	rm -f /etc/dovecot/conf.d/10-ssl.conf

    userdel dovecot || true;
    userdel dovenull || true;

    if [ -d /var/run/dovecot ]; then rm -rf /var/run/dovecot; fi
fi

if [ "$1" = "triggered" ]; then
    if [ -x "/etc/init.d/dovecot" ]; then
        invoke-rc.d dovecot start
    fi
fi

# Automatically added by dh_installinit
if [ "$1" = "purge" ] ; then
	update-rc.d dovecot 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_systemd_enable
if [ "$1" = "remove" ]; then
	if [ -x "/usr/bin/deb-systemd-helper" ]; then
		deb-systemd-helper mask dovecot.socket >/dev/null
	fi
fi

if [ "$1" = "purge" ]; then
	if [ -x "/usr/bin/deb-systemd-helper" ]; then
		deb-systemd-helper purge dovecot.socket >/dev/null
		deb-systemd-helper unmask dovecot.socket >/dev/null
	fi
fi
# End automatically added section
# Automatically added by dh_systemd_enable
if [ "$1" = "remove" ]; then
	if [ -x "/usr/bin/deb-systemd-helper" ]; then
		deb-systemd-helper mask dovecot.service >/dev/null
	fi
fi

if [ "$1" = "purge" ]; then
	if [ -x "/usr/bin/deb-systemd-helper" ]; then
		deb-systemd-helper purge dovecot.service >/dev/null
		deb-systemd-helper unmask dovecot.service >/dev/null
	fi
fi
# End automatically added section