#!/bin/sh -e
# vi: ts=4 noexpandtab
#
# this mimics function of buildroot's makedev
# read a file like:
#  <name>    <type>      <mode>  <uid>   <gid>   <major> <minor> <start> <inc>   <count>
# and make files
DEBUG=${XMAKEDEV_DEBUG}
Usage() {
   cat <<EOF
Usage: ${0##*/} file root
  read file, and make devs apropriately under 'root'.

file looks like:
  <name>    <type>      <mode>  <uid>   <gid>   <major> <minor> <start> <inc>   <count>
  where name is the file name,  type can be one of:
   f       A regular file
   d       Directory
   c       Character special device file
   b       Block special device file
   p       Fifo (named pipe)
EOF
}

error() { echo "$@" 1>&2; exit 1; }
fail() { [ $# -eq 0 ] || error "$@" ; exit 1; }

[ "$1" = "-h" -o "$1" = "--help" ] && { Usage; exit 0; }
[ $# -eq 2 ] || { Usage 1>&2; exit 1; }

root="$2"

if [ "$1" != "-" ]; then
	exec < "$1" || fail "failed to redirect input from $1"
fi

chmodchown() {
	local mode=$1 uid=$2 gid=$3
	shift 3;
	[ "$mode" = "-" ] || chmod "$mode" "$@" || return
	[ "$uid" = "-" ] || chown "$uid" "$@" || return
	[ "$gid" = "-" ] || chgrp "$gid" "$@" || return
}
iswild() {
	local star="\\*"
	case "$1" in
		*$star*) return 0;;
	esac
	return 1
}

cd "$root" || fail "failed cd $root"

while read line; do
	line=${line%#*}
	[ -n "$line" ] || continue
	set -f
	set -- $line
	name=$1; type=$2; mode=$3; uid=$4; gid=$5; major=$6; minor=$7; start=$8; inc=$9; count="${10}"
	set +f
	files="./${name#/}"
	if iswild "$name"; then
		files=$(echo ./$name)
		iswild "$files" && fail "wildcards in wildcards: $files"
	fi
	case "$type" in
		f) 
			for f in $files; do
				$DEBUG mkdir -p "${f%/*}" || fail "failed to make ${f%/*}";
			done
			$DEBUG touch $files &&
			$DEBUG chmodchown "$mode" "$uid" "$gid" $files ||
			fail "failed create file $files"
			;;
		d)
			$DEBUG mkdir -p $files &&
			$DEBUG chmodchown "$mode" "$uid" "$gid" $files ||
			fail "failed create dir $files"
			;;
		c|b)
			for f in $files; do
				$DEBUG mkdir -p "${f%/*}" || fail "failed to make ${f%/*}";
			done
			if [ "$count" = "-" ]; then
				$DEBUG mknod $files $type $major $minor ||
					fail "failed mknod"
				$DEBUG chmodchown "$mode" "$uid" "$gid" $files ||
					fail "failed chmodchown '$mode' '$uid' '$gid' $files"
			else
				[ "$count" = "-" ] && count=1;
				i=0
				while [ $i -lt $count ]; do
					fname="./$name"
					$DEBUG mknod "$fname" "$type" "$major" "$(($minor+($i*$inc)))"
					$DEBUG chmodchown "$fname" "$mode" "$uid" "$gid"
					i=$(($i+1))
				done
			fi
			;;
	esac
done