setup-dns.in

#!/bin/sh

PREFIX=
. "$PREFIX/lib/libalpine.sh"

usage() {
	cat <<-__EOF__
		usage: setup-dns [-h] [-d domain name] [IPADDR...]

		Setup ${ROOT}etc/resolv.conf DNS settings

		options:
		 -h  Show this help
		 -d  specify search domain name

		The optional IPADDR are a list of DNS servers to use.
	__EOF__
	exit 1
}

while getopts "d:n:h" opt; do
	case $opt in
		d) DOMAINNAME="$OPTARG";;
		h) usage;;
		n) NAMESERVERS="$OPTARG";;
	esac
done
shift $(($OPTIND - 1))


conf="${ROOT}etc/resolv.conf"

if [ -f "$conf" ] ; then
	domain=$(awk '/^domain/ {print $2}' $conf)
	dns=$(awk '/^nameserver/ {print $2}' $conf)
fi

if [ -n "$DOMAINNAME" ];then
	domain="$DOMAINNAME"
else
	echon "DNS domain name? (e.g 'bar.com') [$domain] "
	default_read domain $domain
fi

if [ -n "$NAMESERVERS" ] || [ $# -gt 0 ];then
	dns="$NAMESERVERS"
else
	echon "DNS nameserver(s)? ["
	for i in $dns ; do
		echon "$i "
	done
	echon "] "
	default_read dns "$dns"
fi

if [ "$domain" != "" ]; then
	mkdir -p "${conf%/*}"
	echo "search $domain" > $conf
fi

if [ -n "$dns" ] || [ $# -gt 0 ] && [ -f "$conf" ]; then
	sed -i -e '/^nameserver/d' $conf
fi
for i in $dns $@; do
	mkdir -p "${conf%/*}"
	echo "nameserver $i" >> $conf
done