#!/bin/bash
#######################################################
# CRIBBS -- Cron Rsync Incremental Backup Bash Script #
# AUTHOR: Adam Merrifield <http://adam.merrifield.ca> #
# (and countless sources from the web) #
# DATE: 05-26-11 23:17 #
# VERSION: 1.0.0 #
#######################################################
##################
## INSTRUCTIONS ##
##################
# You'll need:
# - a remote server running rsync
# - the ability to create an ssh key pair
# between here and there
# - time
# - patience
# Step 1: read up on the stuff you don't know.
# Step 2: establish an ssh public key pair with your server
# Step 3: save this script as a .sh or .command file
# someplace on your computer
# Step 4: edit the variables accordingly and save
# Step 5: establish a cron job with this saved file
# Step 6: bask in the glory of CRIBBS
##########
## HELP ##
##########
# For rsync help:
# http://rsync.samba.org/ftp/rsync/rsync.html
# For crontab help:
# http://pubs.opengroup.org/onlinepubs/9699919799/utilities/crontab.html
# For ssh-keygen help:
# http://www.openbsd.org/cgi-bin/man.cgi?query=ssh-keygen&sektion=1
###############
## VARIABLES ##
###############
# [EDIT] Local directory to be backed up
# hint: best to include the trailing "/"
LPATH=/Users/name/
# [EDIT] Local files and directories to exclude
# hint: the exclude file should contain one directory/file per line
XPATH=/Users/name/someplace/exclude.file
# [EDIT] Local key
# hint: must match contents of ~/.ssh/authorized_keys on remote server
LKEY=/Users/name/someplace/some-key-name
# [EDIT] Remote login name
# hint: this would "adam" in adam@10.0.1.3
RUSER=username
# [EDIT] Remote backup server name
# hint: this would "10.0.1.3" in adam@10.0.1.3
RHOST=servername
# [EDIT] Remote directory where you want backups to occur
# hint: best to leave off the trailing "/"
RBASE=/home/name
# [EDIT] rsync options
# hint: do not edit unless you know what you're doing
ROPT="-azprvP --delete --delete-excluded --exclude-from=$XPATH --modify-window=2 --force --ignore-errors --stats"
#################
## DO NOT EDIT ##
#################
# Remote current path to test against
RCURRENT=$RBASE/current
# date
date=`date "+%Y-%m-%d-T%H_%M_%S"`
# Remote full progress path
RSSHPROGPATH=$RBASE/previous/incomplete_back-$date
# Remote full completed path
RSSHCOMPPATH=$RBASE/previous/back-$date
# Remote login
RLOGIN=$RUSER@$RHOST
# Remote full rsync path
RSYNCPATH=$RLOGIN:$RSSHPROGPATH
# Make "previous" directory
ssh -i $LKEY $RLOGIN "[ -d $RBASE/previous ] || mkdir $RBASE/previous"
# rsync backup command
rsync $ROPT -e "ssh -i $LKEY" --link-dest=$RCURRENT $LPATH $RSYNCPATH
# shuffle backups around
ssh -i $LKEY $RLOGIN mv $RSSHPROGPATH $RSSHCOMPPATH
ssh -i $LKEY $RLOGIN rm -f $RCURRENT
ssh -i $LKEY $RLOGIN ln -s $RSSHCOMPPATH $RCURRENT
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