#!/bin/bash

# $1 = base name
# $2 = type (b/c)
# $3 = start
# $4 = finish
# $5 = device major
# $6 = device minor of first index
mksubdevs() {
	minor=$6
	for i in `seq $3 $4`; do
		devname="$1$i"
		mknod $devname $2 $5 $minor
		minor=$(($minor+1))
	done
}

usage() {
	echo "usage: makedevs <device root> [class] [class] ..."
	echo
	echo "available classes: base,ide,scsi,fd,tty,pty,rd,md,loop,dm"
	echo "   (use 'all' to select all)"
	echo
	echo "example: makedevs /dev base ide scsi"
	echo
	exit 0
}

DEV_ROOT=$1
[ "$1" == "" ] && usage
shift

cd $DEV_ROOT || exit 1

CLASSES=
while [ "$1" ]; do
	if [ "$1" == "all" ]; then
		CLASSES="base ide scsi fd tty pty rd md loop dm"
	else
		CLASSES="$CLASSES $1"
	fi
	shift
done

for CLASS in $CLASSES; do
	case $CLASS in
		base)
			mknod console c 5  1
			mknod full    c 1  7
			mknod mem     c 1  1
			mknod null    c 1  3
			mknod psaux   c 10 1
			mknod random  c 1  8
			mknod tty     c 5  0
			mknod urandom c 1  9
			mknod zero    c 1  5
			;;
		ide)
			mknod hda b  3  0
			mknod hdb b  3 64
			mknod hdc b 22  0
			mknod hdd b 22 64
			mknod hde b 33  0
			mknod hdf b 33 64
			mknod hdg b 34  0
			mknod hdh b 34 64
			mksubdevs hda b 1 12  3  1
			mksubdevs hdb b 1 12  3 65
			mksubdevs hdc b 1 12 22  1
			mksubdevs hdd b 1 12 22 65
			mksubdevs hde b 1 12 33  1
			mksubdevs hdf b 1 12 33 65
			mksubdevs hdg b 1 12 34  1
			mksubdevs hdh b 1 12 34 65
			;;
		scsi)
			mknod sda b 8 0
			mknod sdb b 8 16
			mknod sdc b 8 32
			mknod sdd b 8 48
			mknod sde b 8 64
			mknod sdf b 8 80
			mknod sdg b 8 96
			mknod sdh b 8 112
			mksubdevs sda b 1 12  8   1
			mksubdevs sdb b 1 12  8  17
			mksubdevs sdc b 1 12  8  33
			mksubdevs sdd b 1 12  8  49
			mksubdevs sde b 1 12  8  65
			mksubdevs sdf b 1 12  8  81
			mksubdevs sdg b 1 12  8  97
			mksubdevs sdh b 1 12  8 113
			# SCSI CD-ROMs
			mksubdevs scd b 0  3 11   0
			mksubdevs sr  b 0  3 11   0
			;;
		fd)
			mksubdevs fd b 0 3 2 0
			;;
		tty)
			mksubdevs tty c 0 63 4 0
			;;
		pty)
			mknod ptmx c 5 2
			;;
		rd)
			mksubdevs ram b 0 15 1 0
			;;
		md)
			mksubdevs md b 0 15 9 0
			;;
		loop)
			mksubdevs loop b 0 7 7 0
			;;
		dm)
			mkdir mapper >/dev/null 2>&1
			mknod mapper/control c 10 63
			;;
		*)
			echo "Unknown class: $CLASS" >&2
			;;
	esac
done