OpenWrt – Rev 1

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#!/bin/sh /etc/rc.common
# Copyright (C) 2017 Rodolfo Giometti <giometti@enneenne.com>
#
# Based on Debian's script /etc/init.d/sysfsutils by
# Martin Pitt <mpitt@debian.org>

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
                                echo "unknown attribute $f2"
                        fi
                elif [ "$f1" = "owner" -a -n "$f2" -a -n "$f3" ]; then
                        if [ -f "/sys/$f2" ]; then
                                chown "$f3" "/sys/$f2"
                        else
                                echo "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
                                echo "unknown attribute $f1"
                        fi
                else
                        echo "syntax error in $CONFFILE: '$f1' '$f2' '$f3'"
                        exit 1
                fi
        done
        }
}

START=11
start() {
        for file in /etc/sysfs.conf /etc/sysfs.d/*.conf; do
                [ -r "$file" ] || continue
                load_conffile "$file"
        done
}