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#!/bin/bash
#
# Example content of duplicity.conf, keep file root:root and only owner 0600
# ---------------- 8< --------------------
# FTP_PASSWORD="ftp_password"
# PASSPHRASE="passphrase"
# TARGET="sftp://server/path"
# ---------------- 8< --------------------

if [ ! "$(whoami)" = root ]; then
  echo "This script must be run by the user: root"
  exit 1
fi

HOME=/home/anton
REMOVE_ALL_BUT_N_FULL=4
REMOVE_OLDER_THAN=1Y
FULL_IF_OLDER_THAN=3M

source "$HOME/.duplicity.conf"
SOURCE=/

print_help() {
  cat <<EOF
Commands:
  backup        run backup
  cleanup       cleanup
  stats         show collection status
  list          list files from backup
  restore       restore files from backup
Options:
  --time|-t time   specify the time from which to restore or list files
EOF
}

_duplicity() {
  GNUPGHOME=/root/.gnupg nice ionice duplicity $DUPLICITY_OPTS "$@"
}

backup() {
  _duplicity --exclude-filelist "$HOME/.duplicity-exclude" \
    --full-if-older-than "$FULL_IF_OLDER_THAN" \
    "$SOURCE" "$TARGET"
  cleanup
}

cleanup() {
  _duplicity cleanup --force "$TARGET"
  _duplicity remove-all-but-n-full $REMOVE_ALL_BUT_N_FULL --force "$TARGET"
}

cleanup-old() {
  _duplicity cleanup --force "$TARGET"
  _duplicity remove-older-than $REMOVE_OLDER_THAN --force "$TARGET"
}

stats() {
  _duplicity collection-status "$TARGET"
}

list() {
  _duplicity list-current-files "$@" "$TARGET"
}

restore() {
  _duplicity restore "$@" "$TARGET" "$(pwd)"
}

if [[ $# = 0 ]]; then
  print_help
  exit 0
fi

while (("$#")); do
  case "$1" in
  backup)
    backup
    ;;
  cleanup)
    cleanup
    ;;
  cleanup-old)
    cleanup-old
    ;;
  stats)
    stats
    ;;
  list)
    shift
    list "$@"
    exit 0
    ;;
  restore)
    shift
    restore "$@"
    exit 0
    ;;
  -h | --help | help)
    print_help
    ;;
  *)
    shift
    _duplicity "$@"
    exit 0
    ;;
  esac
  shift
done