#!/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)

XPATH="${DRIVER_PATH}/../../datastore/xpath.rb --stdin"

unset i j XPATH_ELEMENTS

while IFS= read -r -d '' element; do
    XPATH_ELEMENTS[i++]="$element"
done < <(onevm show -x $VM_ID| $XPATH \
                    /VM/TEMPLATE/DISK[DISK_ID=$DISK_ID]/TYPE)

TYPE_DISK="${XPATH_ELEMENTS[j++]}"

DS_SYS_ID=${DS_SYS_ID:-"$DS_ID"}
VG_NAME="vg-one-$DS_SYS_ID"

if [ "$TYPE_DISK" == "CDROM" ]; then
    if [ -f "$DST_PATH" ]; then
        rm -f $DST_PATH
    fi
else

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

    if [ -d "$DST_PATH" ]; then
        for vol in \$(find /dev/${VG_NAME}-\${hostn}/  -name "lv-one-vm-${VM_ID}-*"); do
            $SUDO $LVREMOVE -f \$vol
        done

        rm -rf "$DST_PATH"
    else
        if [ -e "${DST_PATH}" ]; then
            rm -rf ${DST_PATH}
        fi

        for snap in \$(find /dev/${VG_NAME}-\${hostn}/  -name "lv-one-vm-${VM_ID}-${DISK_ID}-snap*"); do
            $SUDO $LVREMOVE -f \$snap
        done

        if echo "\$DEV" | grep "^/dev/" &>/dev/null; then
            $SUDO $LVREMOVE -f \$DEV
        fi
    fi
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
fi
