setup-interfaces: configure bridge from interface question

setup-interfaces.in

@@ -193,6 +193,47 @@ config_iface() {
 	unconfigured_del $iface
 }
 
+is_bridge() {
+	[ -e /sys/class/net/$1/bridge ] || [ -e $i.bridge_ports ]
+}
+
+unconfigured_non_bridges() {
+	local local i= iflist=
+	for i in $(unconfigured_list); do
+		if ! is_bridge $i; then
+			iflist="${iflist}${iflist:+ }$i"
+		fi
+	done
+	echo $iflist
+}
+
+unconfigured_all_are() {
+	local i=
+	for i; do
+		unconfigured_isin $i || return 1
+	done
+	return 0
+}
+
+config_bridge() {
+	local bridge=$1 iflist=
+	while ! unconfigured_all_done; do
+		set -- $(unconfigured_non_bridges)
+		[ $# -eq 0 ] && return 0;
+		echo "Available interfaces are: $@"
+		ask "Which interface(s) do you want add to bridge $bridge? (or 'done')" $1
+		case $resp in
+			'abort') return 1;;
+			'done') return 0;;
+		esac
+		if unconfigured_all_are $resp; then
+			bridge_add_iface $bridge $resp
+			continue
+		fi
+		echo "$resp is not a valid interface"
+	done
+}
+
 usage() {
         cat <<__EOF__
 usage: setup-interfaces [-bhi] [-p ROOT]
@@ -221,8 +262,12 @@ prompt_for_interfaces() {
 			$(unconfigured_get_first)
 		iface=$resp
 	
-		[ "$iface" = "done" ] && break
-		unconfigured_isin $iface || continue
+		case "$iface" in
+			"done") break;;
+			br[0-9]*|bridge[0-9]*|virbr[0-9]*)
+				config_bridge $iface || continue;;
+			*) unconfigured_isin $iface || continue;;
+		esac
 		config_iface $iface $(printf "%.3d~" $index)
 		index=$(( $index + 1 ))
 	done