#!/usr/local/bin/bash

echo Starting backup at "`date`"

if tty -s
then
	ONTTY=true
	set -x
else
	ONTTY=false
fi

PATH=/usr/local/bin:/usr/local/etc:$PATH
export PATH

case "`whoami`" in
	root)
		export HOME=~root
		;;
esac

DESTDIR=/home/esmf.uci-esmf
#DESTDIR=/notthere/gfs045/backup
SRCDIR=/home
export DESTDIR SRCDIR

if [ "$ONTTY" = true ]
then
	# apply a scaling factor for metadata overhead
	#approxsizeinkbytes="$(du -sk $SRCDIR | awk ' { print $1 }')"
	#approxsizeinkbytes="$(echo 'scale=0; ' $(du -sk . | awk ' { print $1 }') \* 1.1 \* 1024 | bc)"
	unadjusted="$(du -sk $SRCDIR | awk ' { print $1 }')"
	approxsizeinkbytes="$(echo $unadjusted \* 1.1 | bc | sed 's/\..*$//')"
fi

if ! Sinit
then
	echo Initial Sinit failed 1>&2
	exit 1
fi

if ! Smkdir -p "$DESTDIR"/backups
then
	echo "Smkdir -p $DESTDIR/backups" failed 1>&2
	exit 1
fi

Scd "$DESTDIR"/backups || \
	   {
	   echo "$0: cd to" $DESTDIR/backups failed | mailx -s 'ESMF backup trouble' dcs@hydra.acs.uci.edu strombrg@dcs.nac.uci.edu
	   touch /tmp/Backup-failed
	   exit 1
	   }

Smkdir -p daily.1
Smkdir -p daily.2
Smkdir -p weekly.1
Smkdir -p weekly.2
Smkdir -p monthly.1
Smkdir -p monthly.2

day_of_month="`date +%d`"
day_of_week="`date +%a`"

if ! Srm -rf daily.2
then
	echo Error cleaning up daily.2 1>&2
	exit 1
fi

if ! Smv daily.1 daily.2
then
	echo Error mving daily.1 to daily.2 1>&2
	exit 1
fi

if ! Smkdir -p daily.1
then
	echo Error mkdiring daily.1 1>&2
	exit 1
fi

if ! Scd daily.1
then
	echo Error cding up daily.1 1>&2
	exit 1
fi

if ! FULLPATH="$(Spwd)"
then
	echo Erroring getting pwd 1>&2
	exit 1
else
	export FULLPATH
fi

if ! (cd "$SRCDIR" && gtar cf - .) | \
	if [ "$ONTTY" = true ]
	then
		# give a running tally of progress, with estimated time to
		# completion
		if [ 1 = 0 ]
		then
			reblock -e "$approxsizeinkbytes" $(expr 1024 \* 1024) 300
		else
			reblock -f $(expr 1024 \* 1024) 300
		fi
	else
		# only summarize throughput
		reblock -f $(expr 1024 \* 1024) 300
	fi | \
	mtee \
		'gtar tvf - | gzip | chunkup -b 268435456 -n tvf -c "Scpbase"' \
		'gzip | chunkup -b 268435456 -n archive -c "Scpbase"' \
		"wc -c | sed 's/$/ total bytes transmitted/'"
then
	echo Error writing archive and/or table of contents 1>&2
	exit 1
fi

if ! Scd ..
then
	echo Error cding up a level 1>&2
	exit 1
fi


if [ "$day_of_week" = Sun ]
then
	if ! Srm -rf weekly.2
	then
		echo Error rming weekly.2 1>&2
		exit 1
	fi
	if ! Smv weekly.1 weekly.2
	then
		echo Error mving weekly.1 to weekly.2weekly.1 to weekly.2  1>&2
		exit 1
	fi

	if ! Smkdir weekly.1
	then
		echo Error mkdiring weekly.1 1>&2
		exit 1
	fi

	if ! Scp "daily.1/*" "weekly.1/."
	then
		echo Error copying daily.1 to weekly.1 1>&2
		exit 1
	fi
fi

if [ "$day_of_month" = 01 ]
then
#	Srm -rf monthly.2
#	Smv monthly.1 monthly.2
#	Smkdir monthly.1
#	Scp daily.1/* monthly.1/.
	if ! Srm -rf monthly.2
	then
		echo Error rming monthly.2 1>&2
		exit 1
	fi
	if ! Smv monthly.1 monthly.2
	then
		echo Error mving monthly.1 to monthly.2 1>&2
		exit 1
	fi

	if ! Smkdir monthly.1
	then
		echo Error mkdiring monthly.1 1>&2
		exit 1
	fi

	if ! Scp "daily.1/*" "monthly.1/."
	then
		echo Error copying daily.1 to monthly.1 1>&2
		exit 1
	fi
fi

echo Backup finished at "`date`"

echo Starting simplistic verification at "`date`"
if [ 1 = 0 ]
then
	FILE=/dev/null
else
	FILE=/ptmp/strombrg/SRB.tvf
fi
if Restore.SRB -v daily.1 | gunzip -c | gtar tvf - > "$FILE" 2>&1
then
	echo Verification succeeded 1>&2
else
	echo Verification failed 1>&2
fi
echo Simplistic verification finished at "`date`"