#!/sbin/runscript

depend() {
	need localmount
	before logger
}

start() {
	ebegin "Setting sysfs values"

        # check if configuration files exists
        if ! [ -f /etc/conf.d/sysfs ] ; then
	        eerror "  Configuration file /etc/conf.d/sysfs not found!"
		eend -1 "Failed to set syfs values"
		return -1
	fi

	# check if configuration file is empty
	if [[ `cat /etc/conf.d/sysfs | grep -v "^#"` == "" ]]; then
		eerror "  Configuration file  /etc/conf.d/sysfs empty!"
		eend -1 "Failed to set syfs values"
		return -1
	fi

	# check if the SYSFS array is empty
        if [ ${#SYSFS[*]} == 0 ] ; then
                ewarn "  Nothing to do!"
                eend 0
                return -1
        fi
                                                                        
        # set sysfs values
        for i in `seq 1 ${#SYSFS[*]}` ; do
        
        	# check if the string is empty
        	if [[ `echo ${SYSFS[$i-1]}` == "" ]] ; then
        		let p=$i-1
        		eend -1 "  Empty string at position $p in array SYSFS!"
        		continue
        	fi
        	
        	# check if the string is an assignment
        	if ! [[ `echo ${SYSFS[$i-1]} | grep =` ]] ; then
        		let p=$i-1
        		eend -1 "  String must be an assignment at position $p in array SYSFS!"
        		continue
        	fi
        	
       		FILE=`echo ${SYSFS[$i-1]} | cut -d'=' -f1`
       		VALUE=`echo ${SYSFS[$i-1]} | cut -d'=' -f2`
       		
       		# check if $FILE is an empty string
		if [[ $FILE == "" ]] ; then
			let p=$i-1
			eend -1 "  Field <file> empty at position $p in array SYSFS!"
			continue
		fi
		
		# check if $FILE contains spaces
		if [[ `echo $FILE | grep " "` ]] ; then
			let p=$i-1
			eend -1 "  Field <file> can't contain spaces at position $p in array SYSFS!"
			continue
		fi
		
		# check if $VALUE is an empty string
		if [[ $VALUE == "" ]] ; then
			let p=$i-1
			eend -1 "  Field <value> empty at position $p in array SYSFS"
			continue
		fi
		
                # check if the file to be modified is in the /sys tree
                if [[ `echo $FILE | cut -d"/" -f2` != "sys" ]] ; then
       	        	eend -1 "  Cannot modify files not in the sysfs!"
       	        	continue
       	        fi
       	        
	       	# check if the file exists in sysfs
                if ! [ -f $FILE ] ; then
                       	eend -1 "  File $FILE not found in sysfs!"
                       	continue
                fi
                
                ebegin "  Setting `echo $VALUE` in $FILE"
                echo -n "$VALUE" > $FILE
       	        eend $?
	done	
}