#!/bin/bash

# -------------------------------------------------------------------------- #
# Copyright 2002-2017, OpenNebula Project, OpenNebula Systems                #
#                                                                            #
# Licensed under the Apache License, Version 2.0 (the "License"); you may    #
# not use this file except in compliance with the License. You may obtain    #
# a copy of the License at                                                   #
#                                                                            #
# http://www.apache.org/licenses/LICENSE-2.0                                 #
#                                                                            #
# Unless required by applicable law or agreed to in writing, software        #
# distributed under the License is distributed on an "AS IS" BASIS,          #
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   #
# See the License for the specific language governing permissions and        #
# limitations under the License.                                             #
#--------------------------------------------------------------------------- #

# DELETE <host:remote_system_ds/disk.i|host:remote_system_ds/>
#   - host is the target host to deploy the VM
#   - remote_system_ds is the path for the system datastore in the host


DST=$1
VM_ID=$2
DS_ID=$3

if [ -z "${ONE_LOCATION}" ]; then
    TMCOMMON=/var/lib/one/remotes/tm/tm_common.sh
else
    TMCOMMON=$ONE_LOCATION/var/remotes/tm/tm_common.sh
fi

source $TMCOMMON

DRIVER_PATH=$(dirname $0)
#-------------------------------------------------------------------------------
# Return if deleting a disk, we will delete them when removing the
# remote_system_ds directory for the VM (remotely)
#-------------------------------------------------------------------------------
DST_PATH=`arg_path $DST`
DST_HOST=`arg_host $DST`

DS_SYS_ID=$(echo $DST_PATH | grep -E '\/disk\.[[:digit:]]+$' | $AWK -F '/' '{print $(NF-2)}')
DISK_ID=$(basename ${DST_PATH} | cut -d. -f2)
VG_NAME="vg-one-$DS_SYS_ID"

# get BRIDGE_LIST from datastore
XPATH="${DRIVER_PATH}/../../datastore/xpath.rb --stdin"
IFS= read -r -d '' BRIDGE_LIST < <(onedatastore show -x "$DS_SYS_ID" \
    | $XPATH /DATASTORE/TEMPLATE/BRIDGE_LIST )

if [ -n "$BRIDGE_LIST" ]; then
    DST_HOST=$(get_destination_host)
fi

# Delete the device if it's a clone (LVM snapshot)
DELETE_CMD=$(cat <<EOF
    set -x
    
    DEV=\$(readlink $DST_PATH)

    function remove_volume
    {
        count=1
        times=5
        volume=\$1
        $SUDO $LVREMOVE -f \$volume
        function="$SUDO $LVS \$volume"
        value=\$(\$function)
        result=\$?
        while [ \$count -lt \$times  -a "\$result" == "0" ]; do
            sleep 0.5
            count=\$(( \$count + 1 ))
            $SUDO $LVREMOVE -f \$volume
            value=\$(\$function)
            result=\$?
        done
    }

    if [ -d "$DST_PATH" ]; then
        for disk in \$(ls $DST_PATH); do
            if [ -L "$DST_PATH/\${disk}" ]; then
                vol=\$(readlink $DST_PATH/\${disk})
                if echo "\$vol" | grep "^/dev/" &>/dev/null; then
                    remove_volume "\$vol"
                fi
            fi
        done
    else
        if echo "\$DEV" | grep "^/dev/" &>/dev/null; then
            remove_volume "\$DEV"
        fi
    fi
    
    rm -rf $DST_PATH
EOF
)

if [ -n "${DS_SYS_ID}" ]; then
    LOCK="tm-fs_lvm-${DS_SYS_ID}.lock"
    exclusive "${LOCK}" 120 ssh_exec_and_log "$DST_HOST" "$DELETE_CMD" \
        "Error deleting $DST_PATH"
else
    ssh_exec_and_log "$DST_HOST" "$DELETE_CMD" \
        "Error deleting $DST_PATH"
fi
