Simple backup script for deploystudio running from external drive

backup_home_dirs.sh

#!/bin/sh

echo "backup_home_dirs.sh - v1.0 - ("`date`")"

set -e

TMPFILE="/tmp/Backup-${DS_SERIAL_NUMBER}-`date "+%Y%m%d"`.dmg"
DS_INTERNAL_DRIVE=`system_profiler SPSerialATADataType|awk -F': ' '/Mount Point/ {print $2}'|head -n1`
MOUNTPOINT="/Volumes/UserBackups-${DS_SERIAL_NUMBER}"
SPARSE="${TMPFILE}.sparseimage"
SOURCE="${DS_INTERNAL_DRIVE}/Users/"

if [ ! -d "${SOURCE}" ]; then
	echo "No Users folder to backup!"
	exit 0
fi

echo "Cleaning up from previous runs..."
if [ -e "${SPARSE}" ]; then
	rm -f "${SPARSE}"
fi

find /Volumes -type d -name "UserBackup*" -maxdepth 1 -print0 | while read -d $'\0' DIR
do
	hdiutil detach "$DIR"
done

	
echo "Checking if enough space..."
USERS_SIZE=`du -sm "${SOURCE}" | awk '{print $1}'`
echo "User folder is ${USERS_SIZE} MB"
FREE_SPACE=`df -m / | sed '1d' | awk '{print $4}'`
echo "Backup disk has ${FREE_SPACE} MB free"
if [[ ${USERS_SIZE} -gt $((FREE_SPACE-1000)) ]]; then
	echo "Users folder is too large for backup disk, backup not possible."
	exit 1
fi

echo "Creating sparseimage..."
hdiutil create "${TMPFILE}" -type SPARSE -fs HFS+ -volname "UserBackups-${DS_SERIAL_NUMBER}"
echo "Attaching sparseimage..."
hdiutil attach -noautoopen -nobrowse -owners on "${SPARSE}"
echo "Copying ${SOURCE} to ${MOUNTPOINT}..."
# ditto -vV "${SOURCE}" "${MOUNTPOINT}"
rsync -arv 	--exclude="Library/Caches" 	\
			--exclude="Library/PubSub" \
			--exclude="Library/Fonts" \
			--exclude="support/" \
			--exclude="ics/" \
			--exclude="Shared/" \
			"${SOURCE}" "${MOUNTPOINT}"
# diff -qr "${SOURCE}" "${MOUNTPOINT}"
echo "Moving temp sparseimage to Backups folder..."
cp "${SPARSE}" /Backups/
rm -f "${SPARSE}"
echo "Detaching image..."
hdiutil detach "${MOUNTPOINT}"

exit 0