#!/bin/sh

set -e
false
dir=/var/local/backup
device=/dev/sda4
blocksize=2048
filesystems=all

cd $dir
PATH=/usr/local/lib/backup:$PATH export PATH

echo "FAILED during startup of incremental" >this-status

timestamp='.'
for tsfs in `cat all-fsys-n`
do
	echo "Checking timestamp of last full dump of $tsfs;"
	if ! test "lfull.$timestamp" -ot "lfull.$tsfs"
	then
		timestamp="$tsfs"
	fi
done

if test -f "lfull.$timestamp"
then
	echo "Using timestamp of last full dump of $timestamp."
else
	echo >&2 "No full dump of $timestamp done yet."
	exit 1
fi

rm -f this-fulldump
since="`cat lfull.$timestamp`"
doing="incremental since dump of $timestamp at `cat lfull.$timestamp` to $device"

>increm-log
chmod 660 increm-log

echo Doing "$doing" ...
echo "$doing": >>increm-log
cat fsys.all
echo "tar -lvvc \"-N$since\" -T$dir/fsys.all -f - \\"
echo "  2>>increm-log | dd of=$device bs=${blocksize}b"
echo "FAILED during incremental" >this-status
cd /
tar -lvvc "-N$since" -T$dir/fsys.all -f - 2>>$dir/increm-log \
	| dd of=$device bs=${blocksize}b
cd $dir

echo "FAILED during cleanup" >this-status

test -f this-fulldump && mv this-fulldump "lfull.$filesystems"
echo "$doing" completed.

echo "Next dump tape to use would be `cat next-full`".

echo "INCREMENTAL successful" >this-status