#!/bin/sh

# Primary sends files in $DIR.
export PATH=/bin:/sbin:/usr/bin:/usr/sbin

DIR="/var/powerdns/"

local_update() {
	echo "update domain $1"
	pdns_control bind-reload-now $1 | grep "no such domain"

	# In case the update cannot be done, it might be because the zone wasn't loaded at all.
	if [ $? -eq 0 ]; then
		pdns_control bind-add-zone $1 $DIR/$1
	fi
}

local_delete() { echo "TODO: delete domain $1" ; }

action() {
	event=$1
	file=$2

	echo $event | grep "CLOSE_WRITE" >/dev/null
	if [ $? -eq 0 ]; then
		echo "$file has been modified"
		local_update $file
	fi

	echo $event | grep "DELETE" >/dev/null
	if [ $? -eq 0 ]; then
		echo "$file has been deleted"
		local_delete $file
	fi
}

# NOTE: primary nameserver sends files in $DIR upon modification or remove them
#
# Therefore, the different interesting actions we should monitor are:
# - close_write: a zone file has been modified
# - delete: a domain has been removed
opts="-e close_write -e delete -m"
echo "inotifywait ${opts} --format '%:e %f' $DIR"
inotifywait ${opts} --format '%:e %f' $DIR | while read LINE; do action $LINE ; done