Backup Docker Compose Directory

backup-docker-compose.sh

#!/usr/bin/env bash

set -e

help() {
  echo 'Usage: backup-docker-compose -t <tag_name> [docker-compose-working-directory]'
  echo ''
  echo '  e.g.  $ backup-docker-compose -t v1.3.3-1 /data/deploy/nginx'
  echo '        $ backup-docker-compose -t v1.3.3-1'
  echo '        $ backup-docker-compose'
}

# archive tag
archive_tag=""
while getopts ":t:" opt; do
  case ${opt} in
    t )
      archive_tag="${OPTARG}"
      ;;
    * )
      ;;
  esac
done
shift $((OPTIND -1))
if [ "${archive_tag}" == "" ]; then
  archive_tag="$(date +%y%m%d%H%M%S-%N)"
fi

# get docker-compose working directory
other_args=("$@")
first_arg="${other_args[0]}"
workdir="$(realpath "${first_arg:-"$(pwd)"}")"
echo "==> archive: ${workdir} ${archive_tag}"
cluster_name="$(basename "${workdir}")"
archived_file_name="${cluster_name}-${archive_tag}.tar.xz"

# 1. check /usr/bin/docker-compose
if [ ! -f /usr/bin/docker-compose ]; then
  echo "[ERROR] file not found: /usr/bin/docker-compose"
  exit 1
fi

# 2. check docker-compose.yaml
if [ ! -f "${workdir:?}/docker-compose.yaml" ]; then
  echo "[ERROR] file not found: ${workdir:?}/docker-compose.yaml"
  exit 1
fi

# 3. check already exists
if [ -f "$(realpath "$(dirname "${workdir}")")/${archived_file_name}" ]; then
  echo "[ERROR] already exists: $(realpath "$(dirname "${workdir}")")/${archived_file_name}"
  exit 1
fi

# get running cnt
running_cnt="$({
  cd "${workdir}"
  docker-compose ps -q | wc -l
})"

# stop services if is running
if [ "${running_cnt:-0}" != 0 ]; then
  docker-compose --project-directory "${workdir}" --progress quiet down && echo "OK: stop services"
fi

# backup
(
  cd "$(realpath "$(dirname "${workdir}")")"
  tar cf - "${cluster_name}/" | pv -s "$(du -sb "${cluster_name}/" | awk '{print $1}')" | xz -T 0 > "${archived_file_name}"
)
echo "OK: backup at $(realpath "$(dirname "${workdir}")")/${archived_file_name}"

# start services if is running
if [ "${running_cnt:-0}" != 0 ]; then
  docker-compose --project-directory "${workdir}" --progress quiet up -d && echo "OK: resume services"
fi
echo "================================ FINISHED: $(date +%Y-%m-%d-%H%M%S) ================================"