#! /bin/sh
#
#       Based on a example file to build /etc/init.d/ scripts,
#        written by Miquel van Smoorenburg <miquels@cistron.nl>
#        and later modified by Ian Murdock <imurdock@gnu.ai.mit.edu>.
#
#       Also based on init script mountnfs.sh from initscripts package.
#
#       Modified for aoetools by David Martnez Moreno <ender@debian.org>.
#       Copyright 2006-2014.  Under GPLv2.
#
#       Support for LVM and other mount points contributed by Glen W. Mabey.
#       Support for RAID contributed by Gabor Kiss.
#
### BEGIN INIT INFO
# Provides:          aoe aoetools
# Required-Start:    $local_fs $network
# Required-Stop:     $local_fs $network
# Should-Start:
# Default-Start:     S
# Default-Stop:      0 6
# Short-Description: Begin AoE discovery and mount related filesystems.
# Description:       Begin AoE discovery and mount filesystems residing
#                    on AoE volumes.
### END INIT INFO

NAME=aoetools
DESC="AoE devices discovery and mounting AoE filesystems"

[ -f /etc/default/rcS ] && . /etc/default/rcS
. /lib/lsb/init-functions

# Include aoetools defaults if available
if [ -f /etc/default/aoetools ]
then
  . /etc/default/aoetools
fi

set -e

create_fs_list() {
  # We start with a list from /etc/default/aoetools.
  waitaoe="$AOEMOUNTS"

  [ -f /etc/fstab ] || return
  #
  # Read through fstab line by line. If it contains /dev/etherd, set the flag
  # for mounting file systems over AoE.
  #

  exec 9<&0 </etc/fstab

  while read DEV MTPT FSTYPE OPTS REST
  do
    case "$OPTS" in
      noauto|*,noauto|noauto,*|*,noauto,*)
        continue
        ;;
    esac
    case "$DEV" in
      ''|\#*)
        continue
        ;;
      /dev/etherd/*)
        waitaoe="$waitaoe $MTPT"
    esac
  done

  exec 0<&9 9<&-
}

do_start() {
  # We exit if the user does not want us to try this.
  if [ "$INTERFACES" = "none" ]
  then
    echo "INTERFACES='none' in /etc/default/aoetools, not started."
    exit 0
  fi

  # Usually aoe is a module, so we will try to load it.
  if [ -n "$INTERFACES" ]
  then
    modprobe aoe aoe_iflist="$INTERFACES" >/dev/null 2>&1 || true
  else
    modprobe aoe >/dev/null 2>&1 || true
  fi

  # Also, if udev is being used, the /dev/etherd devices
  # are not created until aoe module insertion, so...
  sleep 1  # ...we give udev a chance to populate /dev/etherd/.

  if [ ! -c /dev/etherd/discover ]
  then
    echo
    echo "Missing devices under /dev/etherd/.  Please run" >&2
    echo "  aoe-mkdevs /dev/etherd" >&2
    echo "and try again." >&2
    exit 1
  fi

  # Try to set up interfaces for discovery, if any.
  if [ -n "$INTERFACES" ]
  then
    aoe-interfaces $INTERFACES
  fi

  aoe-discover

  create_fs_list

  if [ -n "$waitaoe" ]
  then
    echo
  fi

  if [ ! -x '/sbin/mdadm' -a -n "$RAID_ARRAYS" ]
  then
    echo
    echo "/sbin/mdadm is not present. Please install mdadm package and try again." >&2
    echo "RAID_ARRAYS option is ignored." >&2
    RAID_ARRAYS=''
  fi

  if [ -n "$RAID_ARRAYS" ]
  then
    echo "Assembling RAID arrays..."
    for md in $RAID_ARRAYS
    do
      /sbin/mdadm --assemble $md --scan
    done
  fi

  if [ ! -x '/sbin/vgchange' -a -n "$LVMGROUPS" ]
  then
    echo
    echo "The LVM2 tools are not present.  Please install lvm2 package and try again." >&2
    echo "We will not honour LVMGROUPS." >&2
    LVMGROUPS=''
  fi

  if [ -n "$LVMGROUPS" ]
  then
    echo "Assembling LVM2 groups..."
    for vg in "$LVMGROUPS"
    do
      vgchange --available=y $vg
    done
  fi

  if [ -n "$waitaoe" ]
  then
    for mountpt in $waitaoe
    do
      echo "Mounting $mountpt..."
      mount $mountpt
      #log_action_begin_msg "Waiting for $mountpt."
    done
  else
    echo "Nothing to mount."
  fi
}

do_stop() {
  create_fs_list

  if [ -n "$waitaoe" ]
  then
    for mountpt in $waitaoe; do
      if [ -z "`awk '{print $2}' < /proc/mounts | grep -w $mountpt$`" ]
      then
        # It's already been unmounted.
        continue
      fi
      echo "Unmounting $mountpt..."
      umount $mountpt
    done
  fi

  if [ -n "$LVMGROUPS" ]
  then
    for vg in "$LVMGROUPS"
    do
      vgchange --available=n $vg
    done
  fi

  if [ -x /sbin/mdadm -a -n "$RAID_ARRAYS" ]
  then
    echo "Stopping RAID arrays..."
    for md in $RAID_ARRAYS
    do
      /sbin/mdadm --stop /dev/$md
    done
  fi

  # Removing the module prevents LVM's "Shutting down LVM Volume Groups..."
  # from hanging when an LVM has been setup on a device in /dev/etherd/.
  modprobe --remove aoe >/dev/null 2>&1 || true
}

do_status() {
  if $(lsmod |grep -qw '^aoe\s')
  then
    echo 'The aoe module is loaded.'
  fi
  # FIXME: Make something smarter like detect udev or a monolithic kernel.

  AOE_MOUNTS="$(grep '/dev/etherd/' /proc/mounts || true)"
  if [ -n "$AOE_MOUNTS" ]
  then
    echo 'The following AoE file systems are mounted:'
    echo "$AOE_MOUNTS" | awk '{print $2}'
  else
    echo 'No AoE file systems mounted.'
  fi

}

case "$1" in
  start|restart|reload|force-reload)
    echo -n "Starting $DESC: "
    do_start
    ;;
  stop)
    echo "Stopping $DESC: "
    do_stop
    ;;
  status)
    do_status
    ;;
  *)
    N=/etc/init.d/$NAME
    echo "Usage: $N {start|stop|restart|reload|force-reload|status}" >&2
    exit 1
    ;;
esac

exit 0