snap_create_live

#!/bin/bash

# -------------------------------------------------------------------------- #
# Copyright 2002-2021, 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.                                             #
#--------------------------------------------------------------------------- #

# snap_create host:parent_image snap_id vmid ds_id

SRC=$1
SNAP_ID=$2
VMID=$3
DSID=$4

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

DRIVER_PATH=$(dirname $0)

source $TMCOMMON
source ${DRIVER_PATH}/../../etc/vmm/kvm/kvmrc

SRC_PATH=$(arg_path $SRC)
SRC_HOST=$(arg_host $SRC)

#-------------------------------------------------------------------------------
# Get Image information
#-------------------------------------------------------------------------------

DISK_ID=$(basename ${SRC} | 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 $VMID| $XPATH \
                    /VM/DEPLOY_ID \
                    /VM/TEMPLATE/DISK[DISK_ID=$DISK_ID]/SOURCE \
                    /VM/TEMPLATE/DISK[DISK_ID=$DISK_ID]/CLONE \
                    /VM/HISTORY_RECORDS/HISTORY[last\(\)]/TM_MAD)

DEPLOY_ID="${XPATH_ELEMENTS[j++]}"
DISK_SRC="${XPATH_ELEMENTS[j++]}"
CLONE="${XPATH_ELEMENTS[j++]}"
TM_MAD="${XPATH_ELEMENTS[j++]}"


SYSTEM_DS_PATH=$(dirname ${SRC_PATH})
IMAGE_DS_PATH=$(dirname ${DISK_SRC})
CURRENT_PATH=''

if [ "$CLONE" = "YES" ]; then
    DISK_PATH="${SYSTEM_DS_PATH}/disk.${DISK_ID}"
else
    DISK_PATH=$DISK_SRC

    if [ "${TM_MAD}" = 'ssh' ]; then
        CURRENT_PATH="${SYSTEM_DS_PATH}/disk.${DISK_ID}"
    fi
fi

SNAP_DIR="${DISK_PATH}.snap"
SNAP_PATH="${SNAP_DIR}/${SNAP_ID}"
SNAP_PATH_RELATIVE=$(basename ${SNAP_PATH})
CURRENT_PATH="${CURRENT_PATH:-${DISK_PATH}}"

CMD=$(cat <<EOT
set -ex -o pipefail

if [ ! -d "${SNAP_DIR}" ]; then
    mkdir "${SNAP_DIR}"
fi

if virsh -c $LIBVIRT_URI domfsfreeze $DEPLOY_ID ; then
    trap "virsh -c $LIBVIRT_URI domfsthaw $DEPLOY_ID" EXIT TERM INT HUP
elif virsh -c $LIBVIRT_URI suspend $DEPLOY_ID; then
    trap "virsh -c $LIBVIRT_URI resume $DEPLOY_ID" EXIT TERM INT HUP
else
    error_message "$script_name: Could not domfsfreeze or suspend domain"
    exit 1
fi

# Copy current state to a new snapshot
lizardfs makesnapshot -o "${CURRENT_PATH}" "${SNAP_PATH}"
EOT
)

ssh_exec_and_log "${SRC_HOST}" "${CMD}" \
                 "Error creating snapshot ${SNAP_PATH}"