scripts/pacman/backup_packages at main · tocic/scripts · GitHub

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#!/bin/bash
#
# Backup the names of installed packages.
#
# Dependencies: coreutils, pacman, util-linux

set -o nounset -o pipefail

readonly DEFAULT_BACKUP_DIR="${HOME}/backup/pacman"

readonly L_OPTS="backup_dir:,help,version"
readonly OPTS="d:hVv"

readonly CMD="${0##*/}"
readonly USAGE="${CMD} [OPTION]..."
readonly USAGE_ERR_MSG=$(
  cat <<END
Usage: ${USAGE}
Try '${CMD} --help' for more information.
END
)
readonly VERSION_INFO=$(
  cat <<END
${CMD} (scripts) 1.0.0

This is free and unencumbered software released into the public domain.
For more information, please refer to <https://unlicense.org/>.
END
)
readonly HELP=$(
  cat <<END
SYNOPSIS
  ${USAGE}

DESCRIPTION
  Backup the names of installed packages.

OPTIONS
  -d, --backup_dir DIR, --backup_dir=DIR
    change the backup directory from ${DEFAULT_BACKUP_DIR} to DIR
  -h, --help
    display this help and exit
  -V, -v, --version
    display version and exit
END
)

opts=$(getopt --options=${OPTS} --longoptions=${L_OPTS} --name "${CMD}" -- "$@")
if (($? != 0)); then
  echo "${USAGE_ERR_MSG}"
  exit 2
fi

eval set -- "${opts}"

backup_dir="${DEFAULT_BACKUP_DIR}"
need_help=false
need_version=false

while true; do
  case "$1" in
    -d | --backup_dir)
      backup_dir="$2"
      shift 2
      ;;
    -h | --help)
      need_help=true
      shift
      break
      ;;
    -V | -v | --version)
      need_version=true
      shift
      break
      ;;
    --)
      shift
      break
      ;;
  esac
done

if [[ $need_help == true ]]; then
  echo "${HELP}"
  exit 0
fi

if [[ $need_version == true ]]; then
  echo "${VERSION_INFO}"
  exit 0
fi

if (($# != 0)); then
  echo "${CMD}: expected 0 arguments; got $#"
  echo "${USAGE_ERR_MSG}"
  exit 2
fi

pacman --query --explicit --native --quiet \
  >"${backup_dir}/explicit_native.pkg"
pacman --query --explicit --foreign --quiet \
  >"${backup_dir}/explicit_foreign.pkg" \
  || true
pacman --query --deps --native --unrequired --unrequired --quiet \
  >"${backup_dir}/implicit_optional_native.pkg" \
  || true
pacman --query --deps --foreign --quiet \
  >"${backup_dir}/implicit_foreign.pkg" \
  || true