Simple duplicity backup script

backup-offline.sh

#!/usr/bin/env bash

# Backup script to an offline external drive
#
# Assumptions:
#   * The drive is already mounted and it matches the destination
#   * The encryption is taken care at the drive itself and its decypted before
#   the script starts
#
# Is its recomemended to run this script without perfoming any workload
#
# Sends notifications to Pushover once steps are done

readonly logger_tag="backup-offline"
source "${HOME}/bin/source-me.sh"

readonly backup_dir="/home/masterkorp"
readonly destination="file:///path/to/backup"
readonly full_backups=2

logMessage "Started backup script" 0
duplicity collection-status --no-encryption \
  "${destination}"

getConfirmation "A backup is about start. Do you want to continue?"
if [[ $? == "1" ]]; then
  echo "Backup aborted by user"
  exit 1
fi

duplicity --no-encryption \
  --name offline \
  --full-if-older-than 30D \
  --exclude "${backup_dir}/.atom" \
  --exclude "${backup_dir}/.bundle" \
  --exclude "${backup_dir}/.cache" \
  --exclude "${backup_dir}/Downloads" \
  --exclude "${backup_dir}/Public" \
  --exclude "${backup_dir}/tmp" \
  --exclude "${backup_dir}/VirtualBox VMs" \
  --exclude "**.swp" \
  --exclude "**.tmp" \
  --exclude "**~" \
  --use-agent \
  "${backup_dir}" "${destination}"

logMessage "Offline backup finished" 3
sendPush "Offline Backup Finished"

getConfirmation "Do you want to remove old backups?"
if [[ $? == "1" ]]; then
  echo "Backup aborted by user"
  exit 1
fi

duplicity remove-all-but-n-full $full_backups \
  --name offline \
  --no-encryption --force \
  "${destination}"

sendPush "Finishing prunning offline backups"

exit 0

source-me.sh

#!/bin/sh

# Logs given string to diferent outputs
#
# Usage: logMessage "message" <value>
# Values can be:
# 0 = logs to journal/syslog
# 1 = displays to stdout
# 2 = logs to journal and stdout
# 3 = logs to journal, displays to stdout and shows a popup notification
function logMessage {
  if [[ -z $logger_tag ]]; then
    exit 1;
  fi

  case $2 in
    0)
      logger -t "${logger_tag}" $1 ;;
    1)
      echo ${1} ;;
    2)
      logger -t  "${logger_tag}" $1
      echo ${1} ;;
    3)
      logger -t  "${logger_tag}" $1
      echo ${1}
      notify-send "${logger_tag}" "'${1}'" ;;
    *)
      logger -t "${logger_tag}" $1 ;;
  esac
}

# Prompts for confirmation, returns 1 if Yes
#
# Usage: getConfirmation "Question message"
# You can get anwser value on retcode
# if [[ $? == "1"]]; then
#   echo "You choose no"
# fi
function getConfirmation {
  value=0
  while true; do
    read -p "${1} [Y/n]" yn

    case $yn in
      [Yy]* ) return 0 ;;
      [Nn]* ) return 1 ;;
      * ) return 0 ;;
    esac

  done
}

# Send a push notification to Push Over
# Uses laptop-scripts application
# Sends the tittle as the hostname of the device
#
# Usage: sendPush "<message string>"
function sendPush {
  hostname=$(hostname)

  curl -s \
    --form-string "token=<token>" \
    --form-string "user=<user>" \
    --form-string "title=${hostname}" \
    --form-string "priority=0" \
    --form-string "message=${1}" \
    https://api.pushover.net/1/messages.json
}