isc-dhcp: improve startup performance

On some platforms where interfaces come up very slowly, this can
cause a race-condition with dhcpd coming up before all the interfaces
have finished initializing.

Signed-off-by: Philip Prindeville <philipp@redfish-solutions.com>

net/isc-dhcp/Makefile

@@ -10,7 +10,7 @@ include $(TOPDIR)/rules.mk
 PKG_NAME:=isc-dhcp
 UPSTREAM_NAME:=dhcp
 PKG_VERSION:=4.4.1
-PKG_RELEASE:=5
+PKG_RELEASE:=6
 
 PKG_LICENSE:=BSD-3-Clause
 PKG_LICENSE_FILES:=LICENSE

net/isc-dhcp/files/dhcpd.init

@@ -270,7 +270,16 @@ general_config() {
 	echo "nameserver 127.0.0.1" >> /tmp/resolv.conf
 }
 
+# base procd hooks
+
+boot() {
+	DHCPD_BOOT=1
+	start "$@"
+}
+
 start_service() {
+	local domain dhcp_ifs authoritative
+
 	if [ -n "$DHCPD_BOOT" ] ; then
 		return 0
 	fi
@@ -279,15 +288,13 @@ start_service() {
 		touch $lease_file
 	fi
 
-	local domain dhcp_ifs
-
 	if [ -e "/etc/dhcpd.conf" ] ; then
 		config_file="/etc/dhcpd.conf"
 	else
 		. /lib/functions/network.sh
 
 		config_load dhcp
-		local authoritative
+
 		general_config > $config_file
 
 		config_foreach dhcpd_add dhcp
@@ -302,13 +309,33 @@ start_service() {
 	procd_close_instance
 }
 
-boot() {
-	DHCPD_BOOT=1
-	start "$@"
+reload_service() {
+	rc_procd start_service "$@"
+	prodcd_send_signal dhcpd "$@"
 }
 
-service_triggers()
-{
-	procd_add_reload_trigger "dhcp"
-	procd_add_raw_trigger "interface.*" 3000 /etc/init.d/dhcpd reload
+add_interface_trigger() {
+	local cfg=$1
+	local trigger ignore
+
+	config_get trigger "$cfg" interface
+	config_get_bool ignore "$cfg" ignore 0
+
+	if [ -n "$trigger" -a $ignore -eq 0 ] ; then
+		procd_add_reload_interface_trigger "$trigger"
+	fi
 }
+
+service_triggers() {
+	if [ -n "$DHCPD_BOOT" ] ; then
+		# Make the first start robust to slow interfaces; wait a while
+		procd_add_raw_trigger "interface.*.up" 5000 /etc/init.d/dhcpd restart
+
+	else
+		# reload with normal parameters
+		procd_add_reload_trigger "network" "dhcp"
+		config_load dhcp
+		config_foreach add_interface_trigger dhcp
+	fi
+}
+