#!/bin/bash
# 
# Generate MD5 Files for Release Tracking
# 
# This Script can be used on both sides - the host and the target
#

FULLARGS="$@"
DEBUG=${DEBUG:="false"}

# DEFAULTS:
RELEASE="release"
ACTION="check"
ROOT="/"
REPORT="false"
LOCALSTATS="local"
STORE="var/cache/file-check"

#
# helper functions
#

debug_out(){
	[ "$DEBUG" = "true" ] && echo "$0: $1" >&2
}
	
debug_out "Debugging is enabled - Turn off with DEBUG=false"

my_exit(){
	debug_out "$0: $1"
	exit $2
}

check_argument(){
case "$1" in 
	--*|"")
	debug_out "missing argument"
	return 1
	;;
	[[:alnum:]/]*)
	#debug_out "argument $1 accepted"
	return 0
	;;
esac
}

usage() {
        echo 
        [ -n "$1" ] && echo -e "${PREFIX} error: $1\n"
	echo "Generate / Check MD5 Files for Release Tracking"
	echo 
        echo "usage: $0 <args>"
        echo
        echo " Arguments:"
        echo
        echo "  --action           create | check                  Default: check"
        echo "  --root <path>      Path of the root directory      Default: /"
        echo "  --release <name>   the release name                Default: release"
        echo "  --report           print a report on stdout        Default: deactivated"
        echo "  --store <path>     path of the release store       Default: $STORE"
        echo
		echo " $0 returns with an exit status != 0, if something failed."
	    echo 
        exit 0
}

#
# Option parser
#
while [ $# -gt 0 ]; do
        case "$1" in
                --help) usage ;;
                --action)
			check_argument $2  		
			if [ "$?" = "0" ] ; then 
				ACTION="$2";      		
				shift 2 ;
			else	
				debug_out "skipping option $1";
				shift 1 ;
			fi
			;;
                 --release)
			check_argument $2  		
			if [ "$?" = "0" ] ; then 
				RELEASE="$2";      		
				shift 2 ;
			else	
				debug_out "skipping option $1";
				shift 1 ;
			fi
			;;
                --root)
			check_argument $2  		
			if [ "$?" = "0" ] ; then 
				ROOT="$2";      		
				shift 2 ;
			else	
				debug_out "skipping option $1";
				shift 1 ;
			fi
			;;
                --store)
			check_argument $2  		
			if [ "$?" = "0" ] ; then 
				STORE="$2";      		
				shift 2 ;
			else	
				debug_out "skipping option $1";
				shift 1 ;
			fi
			;;
                --report)
			REPORT="true";      		
			shift 1 ;
			;;
               *)  
			usage "unknown option $1" 
			;;
        esac
done

#
# sanity checks
#

#
# functions
#

create_md5(){
	if [ -d "$ROOT" ]; then 
		cd $ROOT
		debug_out "ROOT Directory is >$(pwd)<"
		RELEASEDIR=$STORE/$RELEASE
		mkdir -p "$RELEASEDIR" || my_exit "mkdir $ROOT/$RELEASEDIR failed" 1
		find . -type f | egrep -v "/sys/|/proc/|/dev/|/mnt|/$STORE" > $RELEASEDIR/files.list
		LC_ALL=C sort -u $RELEASEDIR/files.list > $RELEASEDIR/files.list.tmp && mv $RELEASEDIR/files.list.tmp $RELEASEDIR/files.list
		while read line ; do 
			md5sum $line 
		done < $RELEASEDIR/files.list > $RELEASEDIR/files.md5
	else
		my_exit "directory $ROOT was not found" 1
	fi 
}

check_md5(){
	if [ -d "$ROOT" ]; then 
		cd $ROOT
		debug_out "ROOT Directory is >$(pwd)<"
		RELEASEDIR=$STORE/$RELEASE
		[ -d "$RELEASEDIR" ] || my_exit "release >$RELEASE< invalid" 1
		LOCALSTATSDIR=$STORE/$LOCALSTATS
		mkdir -p "$LOCALSTATSDIR" || my_exit "mkdir $ROOT/$LOCALSTATSDIR failed" 1
		echo "# $(date)" > $LOCALSTATSDIR/check-md5.status
		echo "# These files differ from release $RELEASE:" >> $LOCALSTATSDIR/check-md5.status
		echo "# " >> $LOCALSTATSDIR/check-md5.status
		echo "----------- START ------------" >> $LOCALSTATSDIR/check-md5.status
		md5sum -c $RELEASEDIR/files.md5 | grep -v OK | sed s/:\ FAILED//g>> $LOCALSTATSDIR/check-md5.status
		echo "------------ END -------------" >> $LOCALSTATSDIR/check-md5.status
		#
		find . -type f | egrep -v "/sys/|/proc/|/dev/|/mnt|/$STORE" > $LOCALSTATSDIR/files.list
		LC_ALL=C sort -u $LOCALSTATSDIR/files.list > $LOCALSTATSDIR/files.list.tmp && mv $LOCALSTATSDIR/files.list.tmp $LOCALSTATSDIR/files.list
		echo "# $(date)" > $LOCALSTATSDIR/check-files.status
		echo "# These files do not appear in release $RELEASE, " >> $LOCALSTATSDIR/check-files.status
		echo "# however - they appear on the system:" >> $LOCALSTATSDIR/check-files.status
		echo "# " >> $LOCALSTATSDIR/check-files.status
		echo "----------- START ------------" >> $LOCALSTATSDIR/check-files.status
		diff $RELEASEDIR/files.list $LOCALSTATSDIR/files.list | egrep "<|>" | sed s/'[><][ ][\.]'//g >> $LOCALSTATSDIR/check-files.status
		echo "------------ END -------------" >> $LOCALSTATSDIR/check-files.status
		#
		if [ "$REPORT" = "true" ]; then 
			echo
			cat $LOCALSTATSDIR/check-md5.status
			echo
			cat $LOCALSTATSDIR/check-files.status
			echo 
		fi
	else
		my_exit "directory $ROOT was not found" 1
	fi 
}

create_ipkglist(){
	which ipkg 2>&1 >/dev/null || return
	if [ -d "$ROOT" ]; then 
		cd $ROOT
		debug_out "ROOT Directory is >$(pwd)<"
		RELEASEDIR=$STORE/$RELEASE
		mkdir -p "$RELEASEDIR" || my_exit "mkdir $ROOT/$RELEASEDIR failed" 1
		ipkg list > $RELEASEDIR/ipkg.list
		LC_ALL=C sort -u $RELEASEDIR/ipkg.list > $RELEASEDIR/ipkg.list.tmp && mv $RELEASEDIR/ipkg.list.tmp $RELEASEDIR/ipkg.list
	else
		my_exit "directory $ROOT was not found" 1
	fi 
}

check_ipkglist(){
	which ipkg 2>&1 >/dev/null || return
	if [ -d "$ROOT" ]; then 
		cd $ROOT
		debug_out "ROOT Directory is >$(pwd)<"
		RELEASEDIR=$STORE/$RELEASE
		[ -d "$RELEASEDIR" ] || my_exit "release >$RELEASE< invalid" 1
		[ -e "$RELEASEDIR/ipkg.list" ] || return
		LOCALSTATSDIR=$STORE/$LOCALSTATS
		mkdir -p "$LOCALSTATSDIR" || my_exit "mkdir $ROOT/$LOCALSTATSDIR failed" 1
		ipkg list > $LOCALSTATSDIR/ipkg.list
		LC_ALL=C sort -u $LOCALSTATSDIR/ipkg.list > $LOCALSTATSDIR/ipkg.list.tmp && mv $LOCALSTATSDIR/ipkg.list.tmp $LOCALSTATSDIR/ipkg.list
		echo "# $(date)" > $LOCALSTATSDIR/check-ipkglist.status
		echo "# These package versions differ from release $RELEASE:" >> $LOCALSTATSDIR/check-ipkglist.status
		echo "# " >> $LOCALSTATSDIR/check-ipkglist.status
		echo "----------- START ------------" >> $LOCALSTATSDIR/check-ipkglist.status
		diff $RELEASEDIR/ipkg.list $LOCALSTATSDIR/ipkg.list | egrep ">" | sed s/'[><][ ]'//g >> $LOCALSTATSDIR/check-ipkglist.status
		echo "------------ END -------------" >> $LOCALSTATSDIR/check-ipkglist.status
		#
		if [ "$REPORT" = "true" ]; then 
			cat $LOCALSTATSDIR/check-ipkglist.status
			echo 
		fi
	else
		my_exit "directory $ROOT was not found" 1
	fi 
}

#
# argument handling
#
case $ACTION in
	create)
	create_md5
	create_ipkglist
	;;
	check)
	check_md5
	check_ipkglist
	;;
	*)
	my_exit "Sorry, unknown --action specified: $ACTION"
	;;
esac
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