#!/bin/sh

# This is an example shell script that can be used as a wrapper for a
# msdos.fsck (called by the generic fsck frontend).
#
# WARNING: This script is an older implementation. See msdos.fsck-wrapper2
# for a newer and cleaner one.
#
# WARNING: This script needs write access to /tmp which is probably not
# possible on bootup. Better use msdos.fsck-wrapper2 instead.
#
# The script accepts a standard fsck command line and decides upon the
# the raw filesystem data whether it is a CVF or not. If it is a CVF then
# dmsdosfsck is invoked.
#
# The case when it is not a CVF but an uncompressed msdos partition is a bit
# more complex. First, dosfsck is invoked to check that dos partition. Then
# the script tries to mount that partition and scans its root directory for
# CVFs. If there are CVFs it tries to check them, too, by calling dmsdosfsck
# on them. After that, the msdos partition is unmounted again in order to
# restore the previous state. If the -r option is present in the fsck
# command line, some questions are asked.
#
# Note that this script needs a helper program that finds out whether a 
# file is a CVF or not. If you have added the file(1) magics for CVFs to
# /etc/magic (see the dmsdos installation instructions) you can use a
# combination of file and grep (for example) for that purpose. I think this
# is a standard way. If you still prefer the older method (by calling the
# helper program cvftest) just compile cvftest ('make cvftest') and change 
# some lines below (I've commented out the two cvftest calls and placed a
# file command in the next line).

###########################################################################

# where to find the different filesystem checker utilities
DMSDOSFSCK="dmsdosfsck"
DOSFSCK="dosfsck"

ARGS="$@"
FILE=""
ASK=n

while [ "$1" != "" ];
do
	case "$1" in
	-u) 	shift
		shift ;;
	-d)	shift
		shift ;;
	-r)	ASK=y
		shift ;;
	-*)	shift ;;
	*)	FILE="$1" 
		shift ;;
	esac;
done

#echo "ARGS=$ARGS"
#echo "FILE=$FILE"

#if cvftest $FILE ;
if [ ! -z "`file $FILE | grep CVF`" ];
then
	echo "CVF detected, calling dmsdosfsck..."
	$DMSDOSFSCK $ARGS
	CODE="$?"
else
	echo "no CVF found, calling dosfsck..."
	$DOSFSCK $ARGS
	CODE="$?"
	if [ "$CODE" != "0" ];
	then
		exit $CODE
	fi
	if [ $ASK = y ];
	then
		echo -n "search $FILE for CVFs in it and check them, too?"
		read ANS JUNK
		if [ "$ANS" != "y" -a "$ANS" != "Y" ];
		then
			exit 0
		fi
	fi
	mkdir /tmp/fsckwrap.$$
	if [ "$?" != "0" ];
	then
		echo "need write access to /tmp for automatic CVF check (skipped)"
		exit 0
	fi
	chmod 700 /tmp/fsckwrap.$$
	mount -t msdos $FILE /tmp/fsckwrap.$$
	if [ "$?" != "0" ];
	then
		echo "cannot search $FILE for CVFs in it (skipped)"
		exit 0
	fi

	CODE="0"
	FIRST=y
	for I in /tmp/fsckwrap.$$/dblspace.0?? /tmp/fsckwrap.$$/drvspace.0?? /tmp/fsckwrap.$$/stacvol.*
	do
		if [ -f $I ];
		then
			#if cvftest $I ;
			if [ ! -z "`file $I | grep CVF`" ];
			then
				if [ $FIRST = y ];
				then
					echo "$FILE contains CVFs"
					FIRST=n
				fi
				echo -n "checking CVF "
				basename $I
				$DMSDOSFSCK $ARGS $I
				if [ "$?" != "0" ];
				then
					CODE="$?"
				fi
			fi
		fi
	done
	umount /tmp/fsckwrap.$$
	rmdir /tmp/fsckwrap.$$
fi

exit $CODE