#!/bin/sh
set -x
#
#    how to use rsync to approximate 'timemachine' but to a remote machine.
# WE do not support hard links on directories, so we can't be quite as efficient as Apple's TimeMachine.
# Note: use quotes throughout as filenames may (do) include spaces.
# Note: drive (ON OS X) should be mounted with uids enabled.. sudo /usr/sbin/vsdbutil -a /Volumes/${VOLUME_NAME}
# Note: entries can also be put in /etc/fstab to affect mounting but in OS X 10.5 or later one should use 'vifs'.
# Assume syou have an ssh key on hte remote end unless you wnat to always type a password.
# runs as root. This was running on FreeBSD talking to FreeBSD.

ROOT_VOLUME="SYSTEM_ROOT"
APPDIR="Backups.backupdb"
ORIGINALBASE="/"
EXCLUDEFILE="/root/exclude-from-backup"

BACKUPBASE="backupdir"
BACKUPDIR="${BACKUPBASE}/${APPDIR}"
BACKUPHOSTDIR="${BACKUPDIR}/`hostname -s`"
BACKUPHOST="backup"

BACKUPFILENAME=`date +"%Y-%m-%d-%H%M%S"`
LATESTLINK="${BACKUPHOSTDIR}/Latest"
BACKUPNAME="${BACKUPHOSTDIR}/${BACKUPFILENAME}"
TEMPNAME="${BACKUPNAME}.inprogress"
CREATENAME="${TEMPNAME}/${ROOT_VOLUME}"
REMOTE_CMD="ssh ${BACKUPHOST}"


#if [ -d "${BACKUPNAME}" ]
#then
#  echo "ERROR: Backup ${BACKUPNAME} already exists. Exiting."
#  exit 1
#fi

${REMOTE_CMD} "mkdir -p ${CREATENAME}"

#if [ -e "${LATESTLINK}" ]
#then
  rsync -xaHPR "--exclude-from=${EXCLUDEFILE}" "--link-dest=../../Latest/${ROOT_VOLUME}/" "${ORIGINALBASE}" "${BACKUPHOST}:${CREATENAME}"
#else
#  rsync -xaHPR "--exclude-from=${EXCLUDEFILE}" "${ORIGINALBASE}" "${BACKUPHOST}:${CREATENAME}"
#fi

if  [ $? = 0 ]
then
    ${REMOTE_CMD} touch "${TEMPNAME}/.com.apple.TMCheckpoint"
    ${REMOTE_CMD} mv "${TEMPNAME}" "${BACKUPNAME}"
    ${REMOTE_CMD} rm "${LATESTLINK}"
    ${REMOTE_CMD} ln -sf "${BACKUPFILENAME}" "${LATESTLINK}"
else
    echo " Backup  to ${BACKUPNAME} FAILED"
    ${REMOTE_CMD} mv "${TEMPNAME}" "${BACKUPNAME}.FAILED"
    exit 1
fi