samwiseetc/network/if-up.d/000resolvconf

#!/bin/sh
#
# ifup hook script for resolvconf
#
# This file is part of the resolvconf package.
#

[ -x /sbin/resolvconf ] || exit 0

case "$ADDRFAM" in
  inet|inet6) : ;;
  *) exit 0 ;;
esac

R=""
if [ "$IF_DNS_DOMAIN" ] ; then
	R="${R}domain $IF_DNS_DOMAIN
"
fi
if [ "$IF_DNS_SEARCH" ] ; then
	R="${R}search $IF_DNS_SEARCH
"
fi
if [ "$IF_DNS_SORTLIST" ] ; then
	R="${R}sortlist $IF_DNS_SORTLIST
"
fi
for NS in $IF_DNS_NAMESERVERS ; do
	R="${R}nameserver $NS
"
done

# Note: arguments of multiple instances of options are separated by newlines
set_NS_to_first_arg() { NS="$1" ; }
STANDARD_IFS="$IFS"
IFS='
'
for OPT in $IF_DNS_NAMESERVER ; do
	IFS="$STANDARD_IFS"
	set_NS_to_first_arg $OPT
	[ "$NS" ] && R="${R}nameserver $NS
"
done
IFS="$STANDARD_IFS"

echo -n "$R" | /sbin/resolvconf -a "${IFACE}.${ADDRFAM}" || :