#!/bin/sh

dev_root="$1"
f="$2"

if [ -z "$dev_root" -o -z "$f" ]; then
    echo "usage: $0 <dev root> /etc/udev/devices.d/<name>.nodes"
    exit 1
fi

if [ ! -d "$dev_root" ]; then
    echo "$dev_root is not a directory"
    exit 1
fi

if [ ! -r "$f" ]; then
    echo "unreadable file $f"
    exit 1
fi

grep '^[^#]' $f | \
    while read type name arg1; do
    [ "$type" -a "$name" -a ! -e "$dev_root/$name" -a ! -L "$dev_root/$name" ] ||continue
    case "$type" in
	L) ln -snf $arg1 $dev_root/$name ;;
	D) mkdir -p $dev_root/$name ;;
	M) mknod --mode=600 $dev_root/$name $arg1 ;;
	*) echo "$f: unparseable line ($type $name $arg1)" ;;
    esac
done