packet-block-storage-detach

#!/bin/bash

usage(){
  echo "usage: $0 [-h] [volume_name]"
	echo "	-h		display help"
	echo "	volume_name	specify the volume name to detach, eg: volume-f9a8a263"
	exit 1
}

while getopts "h" OPTION
do
  case $OPTION in
    h) usage
       ;;
  esac
done

shift $(($OPTIND - 1))
if [ $1 ] ; then
	target=$1
fi

function detach_volume () {
  if [ -z "$1" ]
  then
    echo "Error: no iqn passed to detach_volume () function"
		exit
  fi

  if [ -z "$2" ]
  then
    echo "Error: no volume name passed to detach_volume () function"
		exit
  fi

  iqntarget="$1"
  volname="$2"
  if grep $volname /proc/mounts &>/dev/null; then
        wheremnt=$(grep $volname /proc/mounts | awk '{print $2}')
        echo "Error: volume $volname is currently mounted on $wheremnt. Please unmount it first and try again."
        exit 1
  fi

	for iqn in `iscsiadm -m session | awk {'print $4'}`; do
		if [ "$iqntarget" = "$iqn" ] ; then
			portal=`iscsiadm -m session | grep $iqn | awk {'print $3'} | egrep -o '([[:digit:]]{1,3}\.){3}[[:digit:]]{1,3}'`
			echo "Logging out $iqn on $portal"
			iscsiadm --mode node --targetname $iqn --portal $portal --logout
			sed -i "/^$volname.*/d" /etc/multipath/bindings
			multipath -f $volname 
		fi
	done
}

export LOCALMD=/tmp/metadata.tmp
curl -sSL https://metadata.packet.net/metadata > $LOCALMD
volumecnt=`jq '.volumes[].iqn' $LOCALMD | wc -l`

# cleanup mpath entries in bindings file
sed -i "/^mpath.*/d" /etc/multipath/bindings
if [ `ls /dev/mapper/mpath* >/dev/null 2>/dev/null` ]; then
  [ $_V -eq 1 ] && echo "mpath volume entries found, cleaning up"
	for i in `ls /dev/mapper/mpath* | cut -d / -f4`; do
		multipath -f $i
	done
fi

for (( idx=0; idx<$volumecnt; idx++ )); do
	volname=`jq '.volumes['$idx'].name ' $LOCALMD | sed 's/"//g'`
	if [ "$target" ] ; then
		if [ "$volname" = "$target" ] ; then
  		iqn=`jq '.volumes['$idx'].iqn ' $LOCALMD | sed 's/"//g'`
	  	detach_volume $iqn $volname
			continue
		fi
  else
		iqn=`jq '.volumes['$idx'].iqn ' $LOCALMD | sed 's/"//g'`
		detach_volume $iqn $volname
	fi
done

# debian / centos
#rm -rf /var/lib/iscsi/send_targets/*
#rm -rf /var/lib/iscsi/nodes/*

#ubuntu
#rm -rf /etc/iscsi/send_targets/*
#rm -rf /etc/iscsi/nodes/*