export-openstack-volume.sh

#!/usr/bin/env bash
[[ -n "$DEBUG" ]] && set -x
set -eou pipefail

usage() {
    cat <<HELP
USAGE:
    export-openstack-volume VOLUME_ID [CLEAN]
HELP
}

if [ $# -lt 1 ]; then
    usage
    exit 1
fi

VOLUME_ID=$1
CLEAN=${2:-"true"}

TIMESTAMP=$(date +%s)
NEW_VOLUME_ID=""

# 获取卷的信息
VOLUME_INFO=$(openstack volume show "${VOLUME_ID}" -f json)


VOLUME_STATUS=$(echo "${VOLUME_INFO}" | jq -r '.status')
case "${VOLUME_STATUS}" in
  "available")
    # 如果卷不被使用，则不需要创建备份
    AVAILABLE_VOLUME_NAME=$(echo "${VOLUME_INFO}" | jq -r '.name')
  ;;
  "in-use")
    # 如果卷在被使用中，则需要先通过快照复制一份

    # 从卷创建快照
    echo "create snapshot"
    SNAPSHOT_NAME="${VOLUME_ID}-snapshot-${TIMESTAMP}"
    SNAPSHOT_ID=$(openstack volume snapshot create --volume "${VOLUME_ID}" --force "${SNAPSHOT_NAME}" -f json | jq -r '.id')
    echo "snapshot id: ${SNAPSHOT_ID}"

    # 等待就绪
    while true
    do
      STATUS=$(openstack volume snapshot show "${SNAPSHOT_ID}" -f json | jq -r '.status')
      if [ "${STATUS}" == "available" ];then
        break
      fi
      echo "waiting snapshot become ready ..."
      sleep 3
    done

    # 从快照创建新的卷
    echo "create volume from snapshot"
    NEW_VOLUME_SIZE=$(echo "${VOLUME_INFO}" | jq -r '.size')
    NEW_VOLUME_NAME="${VOLUME_ID}-copy-${TIMESTAMP}"
    NEW_VOLUME_ID=$(openstack volume create --snapshot "${SNAPSHOT_ID}" --size "${NEW_VOLUME_SIZE}" "${NEW_VOLUME_NAME}" -f json | jq -r '.id')
    echo "new volume name: ${NEW_VOLUME_NAME}"
    echo "new volume id: ${NEW_VOLUME_ID}"
    echo "new volume size: ${NEW_VOLUME_SIZE}"

    # 等待就绪
    while true
    do
      STATUS=$(openstack volume show "${NEW_VOLUME_ID}" -f json | jq -r '.status')
      if [ "${STATUS}" == "available" ];then
        break
      fi
      echo "waiting volume become ready ..."
      sleep 3
    done

    AVAILABLE_VOLUME_NAME="${NEW_VOLUME_NAME}"

    # 删除快照
    if [ ${CLEAN} != "false" ];then
      echo "delete snapshot: ${SNAPSHOT_ID}"
      openstack volume snapshot delete "${SNAPSHOT_ID}"
    fi
  ;;
  "*")
    echo "unknown volume status: ${VOLUME_STATUS}"
    exit 1
  ;;
esac

# 从卷创建镜像
echo "create image from volume"
IMAGE_NAME="${VOLUME_ID}-image-${TIMESTAMP}"
IMAGE_ID=$(openstack image create --disk-format qcow2 --volume "${AVAILABLE_VOLUME_NAME}" "${IMAGE_NAME}" -f json | jq -r '.id')
echo "volume name: ${AVAILABLE_VOLUME_NAME}"
echo "new image name: ${IMAGE_NAME}"
echo "new image id: ${IMAGE_ID}"

# 等待就绪
while true
do
  STATUS=$(openstack image show "${IMAGE_NAME}" -f json | jq -r '.status')
  if [ "${STATUS}" == "active" ];then
    break
  fi
  echo "waiting image become ready ..."
  sleep 3
done

# 删除复制的卷
if [ "${NEW_VOLUME_ID}" != "" ] && [ ${CLEAN} != "false" ]; then
  echo "delete the volume created from snapshot: ${NEW_VOLUME_ID}"
  openstack volume delete "${NEW_VOLUME_ID}"
fi

# 下载镜像文件
echo "download image file"
IMAGE_FILE="${IMAGE_NAME}.qcow2"
openstack image save --file "${IMAGE_FILE}" "${IMAGE_NAME}"
echo "image file: ${IMAGE_FILE}"

# 删除镜像
if [ ${CLEAN} != "false" ];then
  echo "delete image: ${IMAGE_NAME}"
  openstack image delete "${IMAGE_NAME}"
fi