#!/bin/bash

# ogo-remove-instance
# Author: Sebastian Ley <ley@debian.org>
# 
# This script removes OpenGroupware.org instances, that were registered
# with ogo-create-instance.
# This script is free software, you are allowed to do with it whatever
# you want.

# Defaults
INSTANCE=
REMOVE_ALL=no
PURGE=no

# Subroutines
test_root () {
	if [ ${UID} != "0" ]; then
		return 1
	fi
	return 0
}

get_input () {
	if [ -z ${INSTANCE} ]; then
		cat << EOF

This script removes OpenGroupware instances that have been created by
ogo-create-instance or during the Debian installation of OpenGroupware.org.
The following instances seem to be present on your system:
EOF
		find /etc/opengroupware.org/ -name init.conf | awk -F '/' '{print $4}'
		echo
		echo -n "Instance to be removed: "
		read
		INSTANCE=${REPLY}
	fi
	
	if [ "${PURGE}" = "no" ]; then 
		cat << EOF

A database user and database is associated with an OpenGroupware.org instance.
If the databaseserver isntalled on this machine, the database and the user can
be removed as well.

EOF
		echo -n "Remove database and databse user? (${PURGE}): "
		read
		if [ "${REPLY}" != "" ]; then
			PURGE=${REPLY}
		fi
	fi

	return 0
}

check_instance_available () {
	echo -n "Check if instance ${INSTANCE} is available... "
	if ! ls /etc/opengroupware.org/${INSTANCE}/init.conf >/dev/null 2>&1; then
		echo "failed"
		echo "Instance ${INSTANCE} does not exist."
		return 1
	fi
	echo "done."
	return 0
}

gather_instance_data () {
	 USER=`grep ^USER /etc/opengroupware.org/${INSTANCE}/init.conf | awk -F'=' '{print $2}'`
	 HOMEDIR=`getent passwd ${USER} | awk -F':' '{print $6}'`
	 DB_NAME=`su - -c "Defaults read NSGlobalDomain LSConnectionDictionary | grep databaseName | cut -d'=' -f 2 | sed -e s/^\ *// -e s/\;.*//" ${USER}`
	 DB_USER=`su - -c "Defaults read NSGlobalDomain LSConnectionDictionary | grep userName | cut -d'=' -f 2 | sed -e s/^\ *// -e s/\;.*//" ${USER}`
}

remove_user () {
	echo -n "Remove user and group ${USER}... "
	delgroup ${USER} &>/dev/null
	deluser ${USER} &>/dev/null
	rm -rf ${HOMEDIR}
	echo "done."
	return 0
}

remove_database () {
	echo -n "Removing local database... "
	su - -c "dropdb ${DB_NAME} &>/dev/null || true" postgres
	su - -c "dropuser ${DB_USER} &>/dev/null || true" postgres
	echo "done."
	return 0
}

remove_config () {
	echo -n "Remove instance from the startup system... "
	rm -rf /etc/opengroupware.org/${INSTANCE}
	rm -rf /var/log/opengroupware.org/${INSTANCE}
	
	rm -f /etc/apache/conf.d/mod_ngobjweb-${INSTANCE}.conf
	rm -f /etc/apache2/conf.d/mod_ngobjweb-${INSTANCE}.conf
	echo "done."
	return 0
}

reload_apache () {
	echo -n "Reload apache... "
	if [ -x /usr/sbin/invoke-rc.d ]; then
		invoke-rc.d apache reload &> /dev/null
		invoke-rc.d apache-ssl reload &> /dev/null
		invoke-rc.d apache-perl reload &> /dev/null
		invoke-rc.d apache2 reload &> /dev/null
	else
		/etc/init.d/apache reload &> /dev/null
		/etc/init.d/apache-ssl reload &> /dev/null
		/etc/init.d/apache-perl reload &> /dev/null
		/etc/init.d/apache2 reload &> /dev/null
	fi
	echo "done."
	return 0
}

### Execution starts here ###

while getopts "i:ap" option ; do
	case "$option" in
		a) REMOVE_ALL=yes;;
		p) PURGE=yes;;
		i) INSTANCE="$OPTARG"
	esac
done

if ! test_root; then
	echo "This script must be run as root. Exiting..."
	exit 1
fi

#if [ "$DEBCONF" = "no" ]; then
	if ! get_input; then
		echo "Could not gather user input. Exiting..."
		exit 1
	fi
#fi

gather_instance_data

if ! check_instance_available; then
	exit 1
fi

if ! remove_user; then
	echo "Adding user ${USER} failed. Exiting..."
	exit 1
fi

if [ ${PURGE} == "yes" ]; then
	if ! remove_database; then
		echo "Could remove the database. Skipping."
	fi
else
	echo "Skipping removal of database"
fi

if ! remove_config; then
	echo "Could not remove the OpenGroupware.org instance from the startup system."
fi

reload_apache