#!/bin/sh

# This machine's name, to keep things apart if you have multiple
MACHINE=""

# The password used for encryption
#CRYPTPW="my-supersecret-encryption-password-goes-here"
#we use gpg instead

# Username and password for MySQL (root preferred to backup all tables)
MYSQLUSER=""
MYSQLPASS=""

# Email address where backup files are sent to
RCPT="[email protected]"

# Current date/time in YYYY-MM-DD format
DT=$(date +%F)

# This is the heart of the backup script. It expects 3 parameters:
#   1 - file name prefix, i.e. 'mysql'
#   2 - Description, i.e. "MySQL dump"
#   3 - File- or directory name(s) to backup, i.e. '/tmp/mysqldump.sql'
dobackup(){
  PREFIX=$1
  DESCRIPTION=$2
  shift 2
  DIRS=$@

  # Change to root directory
  cd /

  # Remove temp files we may be using.
  rm -f /tmp/$PREFIX-*

  # Create the archive, and encrypt it
  tar -czf /tmp/$PREFIX-$DT.tgz $DIRS
  #openssl des3 -salt -k $CRYPTPW -in /tmp/$PREFIX-$DT.tgz -out /tmp/$PREFIX-$DT.tgz.des3
  gpg -r "sebnapi" --batch -e /tmp/$PREFIX-$DT.tgz

  # Split this file into 8MB chunks, so we can email it
  split -d --bytes=8M /tmp/$PREFIX-$DT.tgz.gpg /tmp/$PREFIX-$DT.tgz.gpg.

  # Finally email out each chunk separately
  for f in /tmp/$PREFIX-$DT.tgz.gpg.*
  do
    SUBJ="Backup $MACHINE $DT $DESCRIPTION"
    MSG=""
    echo $MSG | mutt "$RCPT" -s "$SUBJ" -a $f
  done

  # Clean up the mess we made
  rm -f /tmp/$PREFIX-*
}

# Dump the MySQL databases
mysqldump -u $MYSQLUSER -p$MYSQLPASS --all-databases -Q > /tmp/mysqldump.sql

# Do the backups
dobackup mysql "1/4 MySQL dump" tmp/mysqldump.sql
dobackup etc "2/4 ETC" etc
dobackup usr "3/4 USR" usr/local
dobackup www "4/4 WWW" var/www

# Remove the database dump
rm -f /tmp/mysqldump.sql