Update image.mk to use standard CI variables

.gitlab-ci.yml

@@ -5,10 +5,6 @@ services:
 stages:
   - build
 
-variables:
-  DOCKER_REGISTRY: ${CI_REGISTRY}
-  DOCKER_IMAGE_PREFIX: ${CI_PROJECT_PATH}/
-
 before_script:
   - docker info
   - docker login -u gitlab-ci-token -p $CI_JOB_TOKEN ${CI_REGISTRY}

image.mk

-OS := centos
-
-IMAGE_PREFIX := ${DOCKER_IMAGE_PREFIX}
-ifeq ($(IMAGE_PREFIX),)
-IMAGE_PREFIX := icinga/$(OS)/
+ifndef CI_REGISTRY
+CI_REGISTRY := registry.icinga.com
 endif
-
-REGISTRY := ${DOCKER_REGISTRY}
-ifneq ($(REGISTRY),)
-IMAGE_PREFIX := $(REGISTRY)/$(IMAGE_PREFIX)
+ifeq ($(CI_PROJECT_PATH),)
+CI_PROJECT_PATH := build-docker/centos
 endif
 
 FROM := $(shell grep FROM Dockerfile | cut -d" " -f2)
-ifeq ($(VERSION),)
-VERSION := $(shell basename `pwd`)
-endif
-IMAGE := $(IMAGE_PREFIX)$(VERSION):$(VARIANT)
+VERSION := $(shell basename $$(pwd))
+IMAGE := $(CI_PROJECT_PATH)/$(VERSION)
 
-ifeq ($(VARIANT),x86_64)
-IMAGE_EXTRA := $(IMAGE_PREFIX)$(VERSION):latest
-else
-IMAGE_EXTRA :=
+ifneq ($(CI_REGISTRY),)
+IMAGE := $(CI_REGISTRY)/$(IMAGE)
 endif
 
+IMAGE_EXTRA_TAG := x86_64
+
 all: pull build
 
 pull:
@@ -30,14 +23,14 @@ pull:
 
 build:
 	docker build --cache-from "${IMAGE}" --tag "$(IMAGE)" .
-ifneq ($(IMAGE_EXTRA),)
-	docker tag "$(IMAGE)" "$(IMAGE_EXTRA)"
+ifdef IMAGE_EXTRA_TAG
+	docker tag "$(IMAGE)" "$(IMAGE):$(IMAGE_EXTRA_TAG)"
 endif
 
 push:
 	docker push "$(IMAGE)"
-ifneq ($(IMAGE_EXTRA),)
-	docker push "$(IMAGE_EXTRA)"
+ifdef IMAGE_EXTRA_TAG
+	docker push "$(IMAGE):$(IMAGE_EXTRA_TAG)"
 endif
 
 clean: