odhcp6c: add a odhcp6c.user placeholder script

Document the existence of this feature. This allows the user to execute a script
at each DHCPv6 event. This is useful, for example, as an ad-hoc way to update a
DDNS entry when (and only when) required.

Signed-off-by: Rui Salvaterra <[email protected]>

package/network/ipv6/odhcp6c/Makefile

@@ -8,7 +8,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=odhcp6c
-PKG_RELEASE:=16
+PKG_RELEASE:=17
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL=$(PROJECT_GIT)/project/odhcp6c.git
@@ -42,12 +42,18 @@ define Package/odhcp6c/config
     default 0
 endef
 
+define Package/odhcp6c/conffiles
+/etc/odhcp6c.user
+endef
+
 define Package/odhcp6c/install
 	$(INSTALL_DIR) $(1)/usr/sbin/
 	$(INSTALL_BIN) $(PKG_BUILD_DIR)/odhcp6c $(1)/usr/sbin/
 	$(INSTALL_DIR) $(1)/lib/netifd/proto
 	$(INSTALL_BIN) ./files/dhcpv6.sh $(1)/lib/netifd/proto/dhcpv6.sh
 	$(INSTALL_BIN) ./files/dhcpv6.script $(1)/lib/netifd/
+	$(INSTALL_DIR) $(1)/etc/
+	$(INSTALL_CONF) ./files/odhcp6c.user $(1)/etc/
 endef
 
 $(eval $(call BuildPackage,odhcp6c))

package/network/ipv6/odhcp6c/files/odhcp6c.user

@@ -0,0 +1 @@
+# This script is sourced by odhcp6c's dhcpv6.script at every DHCPv6 event.