maintenance

#!/bin/bash

# enable, disable or check the maintenance mode.
# If enabled, web access and execution of background tasks are blocked.
# Interaction with the server is only possible through foreground scripts
# We look for the existence of two files: maintenance_lock and cache/maintenance_lock
# and if either exist the system is locked. We attempt to create and remove both of these.
# One or the other _may_ fail due to permissions or ownership issues but the other will
# usually succeed. 

if [ $# -ne 0 ]; then
	action=$1
else
	if [ -f maintenance_lock -o -f cache/maintenance_lock ]; then
		echo "Maintenance mode is enabled"
	else
		echo "Maintenance mode is disabled"
	fi
	echo Usage: $0 'on|off'
	exit
fi

if [ $1 == 'on' ]; then
	touch maintenance_lock > /dev/null 2>&1
	touch cache/maintenance_lock > /dev/null 2>&1
	if [ -f maintenance_lock -o -f cache/maintenance_lock ]; then
		echo "Maintenance mode is enabled"
	else
		echo "Failed: Maintenance mode is disabled"
	fi
fi
if [ $1 == 'off' ]; then
	rm maintenance_lock > /dev/null 2>&1
	rm cache/maintenance_lock > /dev/null 2>&1
	if [ -f maintenance_lock -o -f cache/maintenance_lock ]; then
		echo "Failed: Maintenance mode is enabled"
	else
		echo "Maintenance mode is disabled"
	fi
fi