#!/bin/bash

### BEGIN INIT INFO
# Provides:          rbdmap
# Required-Start:    $network
# Required-Stop:     $network
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Ceph RBD Mapping
# Description:       Ceph RBD Mapping
### END INIT INFO

DESC="RBD Mapping"
RBDMAPFILE="/etc/ceph/rbdmap"

. /lib/lsb/init-functions

do_map() {
	if [ ! -f "$RBDMAPFILE" ]; then
		log_warning_msg "$DESC : No $RBDMAPFILE found."
		exit 0
	fi

	log_daemon_msg "Starting $DESC"
	# Read /etc/rbdtab to create non-existant mapping
	newrbd=
	RET=0
	while read DEV PARAMS; do
		case "$DEV" in
		  ""|\#*)
			continue
			;;
		  */*)
			;;
		  *)
			DEV=rbd/$DEV
			;;
		esac
		OIFS=$IFS
		IFS=','
		for PARAM in ${PARAMS[@]}; do
			CMDPARAMS="$CMDPARAMS --$(echo $PARAM | tr '=' ' ')"
		done
		IFS=$OIFS
		if [ ! -b /dev/rbd/$DEV ]; then
			log_progress_msg $DEV
			rbd map $DEV $CMDPARAMS
			[ $? -ne "0" ] && RET=1
			newrbd="yes"
		fi
	done < $RBDMAPFILE
	log_end_msg $RET

	# Mount new rbd
	if [ "$newrbd" ]; then
                log_action_begin_msg "Mounting all filesystems"
		mount -a
		log_action_end_msg $?
	fi
}

do_unmap() {
	log_daemon_msg "Stopping $DESC"
	RET=0
	# Recursive umount that depends /dev/rbd*
	MNTDEP=$(findmnt --mtab | awk '$2 ~ /^\/dev\/rbd[0-9]*$/ {print $1}' | sort -r)
	for MNT in $MNTDEP; do
		umount $MNT
	done 
	# Unmap all rbd device
	if [ -b /dev/rbd[0-9]* ]; then
		for DEV in /dev/rbd[0-9]*; do
			log_progress_msg $DEV
			rbd unmap $DEV
			[ $? -ne "0" ] && RET=1
		done
	fi
	log_end_msg $RET
}


case "$1" in
  start)
	do_map
	;;

  stop)
	do_unmap
	;;

  reload)
	do_map
	;;

  status)
	rbd showmapped
	;;

  *)
	log_success_msg "Usage: rbdmap {start|stop|reload|status}"
	exit 1
	;;
esac

exit 0