# Copyright 2020 The Kubernetes Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# shared makefile for all images

# get image name from directory we're building
IMAGE_NAME=$(notdir $(CURDIR))
# docker image registry, default to upstream
REGISTRY?=gcr.io/k8s-staging-kind
# tag based on date-sha
TAG?=$(shell echo "$$(date +v%Y%m%d)-$$(git describe --always --dirty)")
# the full image tag
IMAGE?=$(REGISTRY)/$(IMAGE_NAME):$(TAG)
# Go version to use, respected by images that build go binaries
GO_VERSION=$(shell cat $(CURDIR)/../../.go-version | head -n1)

# required to enable buildx
export DOCKER_CLI_EXPERIMENTAL=enabled

# build with buildx
PLATFORMS?=linux/amd64,linux/arm64
OUTPUT?=
PROGRESS=auto
EXTRA_BUILD_OPT?=
build: ensure-buildx
	docker buildx build $(if $(PLATFORMS),--platform=$(PLATFORMS),) $(OUTPUT) --progress=$(PROGRESS) -t ${IMAGE} --pull --build-arg GO_VERSION=$(GO_VERSION) $(EXTRA_BUILD_OPT) .

# push the cross built image
push: OUTPUT=--push
push: build

# quick can be used to do a build that will be imported into the local docker 
# for sanity checking before doing a cross build push
# cross builds cannot be imported locally at the moment
# https://github.com/docker/buildx/issues/59
quick: PLATFORMS=
quick: OUTPUT=--load
quick: build

# enable buildx
ensure-buildx:
	./../../hack/build/init-buildx.sh

.PHONY: push build quick ensure-buildx