#
# rdiff-backup handler script for backupninja
# requires rdiff-backup
#

setsection source
getconf type; sourcetype=$type
getconf label
getconf user; sourceuser=$user
getconf keep
getconf include
getconf exclude

### DESTINATION ###

setsection dest
getconf directory; destdir=$directory
# strip trailing /
destdir=${destdir%/}
getconf type; desttype=$type
getconf user; destuser=$user
getconf host; desthost=$host

[ "$destdir" != "" ] || fatal "Destination directory not set"
[ "$desttype" == "remote" ] || fatal "Only remote destinations are supported"

# see if we can login
debug 0 "su $sourceuser -c \"ssh -o PasswordAuthentication=no $desthost -l $destuser 'echo -n 1'\""
if [ ! $test ]; then
	result=`su $sourceuser -c "ssh -o PasswordAuthentication=no $desthost -l $destuser 'echo -n 1'" 2>&1`
	if [ "$result" != "1" ]; then
		fatal "Can't connect to $desthost as $destuser."
	fi
fi

# see that rdiff-backup has the same version as here
debug 0 "su $sourceuser -c \"ssh $desthost -l $destuser '$RDIFFBACKUP -V'\""
if [ ! $test ]; then
	remoteversion=`su $sourceuser -c "ssh $desthost -l $destuser '$RDIFFBACKUP -V'" 2>&1`
	localversion=`$RDIFFBACKUP -V`
	if [ "$remoteversion" != "$localversion" ]; then
		fatal "rdiff-backup does not have the same version on this computer and the backup server."
	fi
fi

execstr_serverpart="$destuser@$desthost::$destdir/$label"
		
### SOURCE ###

[ "$label" != "" ] || fatal "Source missing label"
[ "$sourcetype" == "local" ] || fatal "Only local source type supported"
[ "$include" != "" ] || fatal "No source includes specified"

execstr_clientpart="/"
	
## REMOVE OLD BACKUPS

if [ "$keep" -gt "0" ]; then
	removestr="rdiff-backup --force --remove-older-than ${keep}D "
	if [ "$desttype" == "remote" ]; then
		removestr="${removestr}${destuser}@${desthost}::"
	fi
	removestr="${removestr}${destdir}/${label}";
	
	debug 0 "su $sourceuser -c '$removestr'"
	if [ ! $test ]; then
		output=`su $sourceuser -c "$removestr" 2>&1`
		code=$?
		if [ "$code" == "0" ]; then
			debug 0 $output
			debug 1 "Removing backups older than $keep days succeeded."
		else
			debug 2 $output
			debug 2 "Failed removing backups older than $keep."
		fi
	fi
fi

## EXECUTE ##
	
execstr="$RDIFFBACKUP --print-statistics "

# TODO: order the includes and excludes

# excludes
for i in $exclude; do
	str="${i//__star__/*}"
	execstr="${execstr}--exclude '$str' "
done
	
# includes 
for i in $include; do
	str="${i//__star__/*}"
	execstr="${execstr}--include '$str' "
done

# exclude everything else
execstr="${execstr}--exclude '/*' "
		
# include client-part and server-part
execstr="${execstr}$execstr_clientpart $execstr_serverpart"

debug 0 "su $sourceuser -c '$execstr'"
if [ ! $test ]; then
	output=`su $sourceuser -c "$execstr" 2>&1`
	code=$?
	if [ "$code" == "0" ]; then
		debug 0 $output
		debug 1 "Successfully finished backing up source '$label'"
	else
		debug 2 $output
		debug 2 "Failed backup up source '$label'"
	fi
fi	

return 0