#! /bin/sh -e

### BEGIN INIT INFO
# Provides:          sysfsconf
# Required-Start:    mountkernfs
# Should-Start:      udev module-init-tools cpufrequtils
# Required-Stop:
# Default-Start:     2 3 4 5
# Default-Stop:
# Short-Description: Set sysfs variables from /etc/sysfs.conf
# Description:       Similarly to /etc/init.d/procps.sh, you can configure
#                    values for sysfs variables (such as power management
#                    defaults) and /sys file permissions in /etc/sysfs.conf.
### END INIT INFO

# /etc/init.d/sysfsutils: 
#
# (c) 2005 Martin Pitt <mpitt@debian.org>

CONFFILE=/etc/sysfs.conf
CONFDIR=/etc/sysfs.d

[ -r "$CONFFILE" -o -d "$CONFDIR" ] || exit 0

. /lib/lsb/init-functions

load_conffile() {
    FILE="$1"
    sed  's/#.*$//; /^[[:space:]]*$/d; 
	  s/^[[:space:]]*\([^=[:space:]]*\)[[:space:]]*\([^=[:space:]]*\)[[:space:]]*=[[:space:]]*\(.*\)/\1 \2 \3/' \
	  $FILE | {
	while read f1 f2 f3; do
	    if [ "$f1" = "mode" -a -n "$f2" -a -n "$f3" ]; then
		if [ -f "/sys/$f2" ] || [ -d "/sys/$f2" ]; then
		    chmod "$f3" "/sys/$f2"
		else
		    log_failure_msg "unknown attribute $f2"
		fi
	    elif [ "$f1" = "owner" -a -n "$f2" -a -n "$f3" ]; then
		if [ -f "/sys/$f2" ]; then
		    chown "$f3" "/sys/$f2"
		else
		    log_failure_msg "unknown attribute $f2"
		fi
	    elif [ "$f1" -a -n "$f2" -a -z "$f3" ]; then
		if [ -f "/sys/$f1" ]; then
		    # Some fields need a terminating newline, others
		    # need the terminating newline to be absent :-(
		     echo -n "$f2" > "/sys/$f1" 2>/dev/null ||
			echo "$f2" > "/sys/$f1"
		else
		    log_failure_msg "unknown attribute $f1"
		fi
	    else
		log_failure_msg "syntax error in $CONFFILE: '$f1' '$f2' '$f3'"
		log_end_msg 1
		exit 1
	    fi
	done
    }
}

case "$1" in
    start|restart|force-reload)
	log_begin_msg "Setting sysfs variables..."

	for file in $CONFFILE $CONFDIR/*.conf; do
	    [ -r "$file" ] || continue
	    load_conffile "$file"
	done

	log_end_msg 0
	;;
    stop)
	;;
    *)
	echo "Usage: /etc/init.d/sysfsutils {start|stop|force-reload|restart}"
	exit 1
	;;
esac