DOMAIN_NAME ?= monotremata.xyz RECORD_NAME ?= wg WD=/var/lib/dags/ddns API_URL = https://api.linode.com/v4 GET_IP_URL = ifconfig.me/ip STATE_DIR = $(WD)/$(RECORD_NAME).$(DOMAIN_NAME) HOST_IP = $(STATE_DIR)/host_ip.txt DOMAIN_ID = $(STATE_DIR)/domain_id.txt RECORD_ID = $(STATE_DIR)/record_id.txt UPDATE_RECORD = $(STATE_DIR)/updated_record LINODE_TOKEN = $(shell cat /mnt/secrets/linode_token) CURL = curl --silent AUTH_CURL = $(CURL) -H "Authorization: Bearer $(LINODE_TOKEN)" define get_id jq '.["data"][] | select(.["$(1)"] == "$(2)")["id"]' endef .PHONY: force clean # because the ip state is only updated when the IP changes, we should only need # to update the record when that happens $(UPDATE_RECORD): $(HOST_IP) $(DOMAIN_ID) $(RECORD_ID) @echo "updating record" $(AUTH_CURL) \ -H "Content-Type: application/json" \ -X PUT -d '{ "target": "'"$$(cat $<)"'" }' \ "$(API_URL)/domains/$$(cat $(DOMAIN_ID))/records/$$(cat $(RECORD_ID))" @touch $@ # the domain id should not change and this should only ever need to run once $(DOMAIN_ID): @echo "fetching domain id" @mkdir -p $(@D) @$(AUTH_CURL) $(API_URL)/domains | \ $(call get_id,domain,$(DOMAIN_NAME)) | \ tee $@ # the register id should not change and this should only ever need to run once $(RECORD_ID): $(DOMAIN_ID) @echo "fetching record id" @mkdir -p $(@D) @$(AUTH_CURL) $(API_URL)/domains/$$(cat $<)/records | \ $(call get_id,name,$(RECORD_NAME)) | \ tee $@ # this target depends on a PHONY so that it is attempted every time, but the # target file should only be updated is the current host ip is different to the # saved one $(HOST_IP): force @echo "fetching host IP" @mkdir -p $(@D) @current_ip=$$($(CURL) $(GET_IP_URL)); \ echo "$$current_ip"; \ if [ ! -f $@ ] || [ "$$current_ip" != "$$(cat $@)" ]; then \ echo "updating stored IP"; \ echo "$$current_ip" | tee $@; \ fi clean: rm -fr $(STATE_DIR)