# Copyright 2017-2020 Authors of Cilium
# SPDX-License-Identifier: Apache-2.0

DOCKER_BUILDER := default

# Export with value expected by docker
export DOCKER_BUILDKIT=1

# Docker Buildx support. If ARCH is defined, a builder instance 'cross'
# on the local node is configured for amd64 and arm64 platform targets.
# Otherwise build on the current (typically default) builder for the host
# platform only.
ifdef ARCH
  # Default to multi-arch builds, always create the builder for all the platforms we support
  DOCKER_PLATFORMS := linux/arm64,linux/amd64
  DOCKER_BUILDER := $(shell docker buildx ls | grep -E -e "[a-zA-Z0-9-]+ \*" | cut -d ' ' -f1)
  ifeq ($(DOCKER_BUILDER),default)
    DOCKER_BUILDKIT_DRIVER :=
    ifdef DOCKER_BUILDKIT_IMAGE
      DOCKER_BUILDKIT_DRIVER := --driver docker-container --driver-opt image=$(DOCKER_BUILDKIT_IMAGE)
    endif
    BUILDER_SETUP := $(shell docker buildx create --platform $(DOCKER_PLATFORMS) $(DOCKER_BUILDKIT_DRIVER) --use)
  endif
  # Override default for a single platform
  ifneq ($(ARCH),multi)
    DOCKER_PLATFORMS := linux/$(ARCH)
  endif
  DOCKER_FLAGS += --push --platform $(DOCKER_PLATFORMS)
else
  # ARCH not specified, build for the host platfrom without pushing, mimicking regular docker build
  DOCKER_FLAGS += --load
endif
DOCKER_BUILDER := $(shell docker buildx ls | grep -E -e "[a-zA-Z0-9-]+ \*" | cut -d ' ' -f1)

##@ Docker Images
.PHONY: builder-info
builder-info: ## Print information about the docker builder that will be used for building images.
	@echo "Using Docker Buildx builder \"$(DOCKER_BUILDER)\" with build flags \"$(DOCKER_FLAGS)\"."

# Generic rule for augmented .dockerignore files.
GIT_IGNORE_FILES := $(shell find . -not -path "./vendor*" -name .gitignore -print)
.PRECIOUS: %.dockerignore
%.dockerignore: $(GIT_IGNORE_FILES) Makefile.docker
	@-mkdir -p $(dir $@)
	@echo "/hack" > $@
	@echo ".git" >> $@
	@echo "/Makefile.docker" >> $@
	echo $(dir $(GIT_IGNORE_FILES)) | tr ' ' '\n' | xargs -P1 -n1 -I {DIR} sed \
		-e '# Remove lines with white space, comments and files that must be passed to docker, "$$" due to make. #' \
			-e '/^[[:space:]]*$$/d' -e '/^#/d' -e '/GIT_VERSION/d' \
		-e '# Apply pattern in all directories if it contains no "/", keep "!" up front. #' \
			-e '/^[^!/][^/]*$$/s<^<**/<' -e '/^![^/]*$$/s<^!<!**/<' \
		-e '# Prepend with the directory name, keep "!" up front. #' \
			-e '/^[^!]/s<^<{DIR}<' -e '/^!/s<^!<!{DIR}<'\
		-e '# Remove leading "./", keep "!" up front. #' \
			-e 's<^\./<<' -e 's<^!\./<!<' \
		-e '# Append newline to the last line if missing. GNU sed does not do this automatically. #' \
			-e '$$a\' \
		{DIR}.gitignore >> $@

DOCKER_REGISTRY ?= quay.io
ifeq ($(findstring /,$(DOCKER_DEV_ACCOUNT)),/)
    # DOCKER_DEV_ACCOUNT already contains '/', assume it specifies a registry
    IMAGE_REPOSITORY := $(DOCKER_DEV_ACCOUNT)
else
    IMAGE_REPOSITORY := $(DOCKER_REGISTRY)/$(DOCKER_DEV_ACCOUNT)
endif

#
# Template for Docker images. Paramaters are:
# $(1) image target name
# $(2) Dockerfile path
# $(3) image name stem (e.g., cilium, cilium-operator, etc)
# $(4) image tag
#
define DOCKER_IMAGE_TEMPLATE
.PHONY: $(1)
$(1): GIT_VERSION $(2) $(2).dockerignore GIT_VERSION builder-info
	$(eval IMAGE_NAME := $(subst %,$$$$*,$(3))$(UNSTRIPPED))
	$(QUIET)docker buildx build -f $(subst %,$$*,$(2)) \
		$(DOCKER_FLAGS) \
		--build-arg BASE_IMAGE=${BASE_IMAGE} \
		--build-arg NOSTRIP=${NOSTRIP} \
		--build-arg LOCKDEBUG=${LOCKDEBUG} \
		--build-arg RACE=${RACE}\
		--build-arg V=${V} \
		--build-arg LIBNETWORK_PLUGIN=${LIBNETWORK_PLUGIN} \
		--build-arg CILIUM_SHA=$(firstword $(GIT_VERSION)) \
		--build-arg OPERATOR_VARIANT=$(IMAGE_NAME) \
		-t $(IMAGE_REPOSITORY)/$(IMAGE_NAME):$(4) .
ifeq ($(findstring --push,$(DOCKER_FLAGS)),)
	@echo 'Define "DOCKER_FLAGS=--push" to push the build results.'
else
	docker buildx imagetools inspect $(IMAGE_REPOSITORY)/$(IMAGE_NAME):$(4)
	@echo '^^^ Images pushed, multi-arch manifest should be above. ^^^'
endif

$(1)-unstripped: NOSTRIP=1
$(1)-unstripped: UNSTRIPPED=-unstripped
$(1)-unstripped: $(1)
endef

# docker-cilium-image
$(eval $(call DOCKER_IMAGE_TEMPLATE,docker-cilium-image,images/cilium/Dockerfile,cilium,$(DOCKER_IMAGE_TAG)))

# dev-docker-image
$(eval $(call DOCKER_IMAGE_TEMPLATE,dev-docker-image,images/cilium/Dockerfile,cilium-dev,$(DOCKER_IMAGE_TAG)))

# docker-plugin-image
$(eval $(call DOCKER_IMAGE_TEMPLATE,docker-plugin-image,images/cilium-docker-plugin/Dockerfile,docker-plugin,$(DOCKER_IMAGE_TAG)))

# docker-hubble-relay-image
$(eval $(call DOCKER_IMAGE_TEMPLATE,docker-hubble-relay-image,images/hubble-relay/Dockerfile,hubble-relay,$(DOCKER_IMAGE_TAG)))

# docker-clustermesh-apiserver-image
$(eval $(call DOCKER_IMAGE_TEMPLATE,docker-clustermesh-apiserver-image,images/clustermesh-apiserver/Dockerfile,clustermesh-apiserver,$(DOCKER_IMAGE_TAG)))

# docker-operator-images.
# We eat the ending of "operator" in to the stem ('%') to allow this pattern
# to build also 'docker-operator-image', where the stem would be empty otherwise.
$(eval $(call DOCKER_IMAGE_TEMPLATE,docker-opera%-image,images/operator/Dockerfile,opera%,$(DOCKER_IMAGE_TAG)))
$(eval $(call DOCKER_IMAGE_TEMPLATE,dev-docker-opera%-image,images/operator/Dockerfile,opera%,$(DOCKER_IMAGE_TAG)))

#
# docker-*-all targets are mainly used from the CI
#
docker-images-all: docker-cilium-image docker-plugin-image docker-hubble-relay-image docker-clustermesh-apiserver-image docker-operator-images-all ## Build all Cilium related docker images.

docker-images-all-unstripped: docker-cilium-image-unstripped docker-plugin-image-unstripped docker-hubble-relay-image-unstripped docker-clustermesh-apiserver-image-unstripped docker-operator-images-all-unstripped ## Build all Cilium related unstripped docker images.

docker-operator-images-all: docker-operator-image docker-operator-aws-image docker-operator-azure-image docker-operator-alibabacloud-image docker-operator-generic-image ## Build all variants of cilium-operator images.

docker-operator-images-all-unstripped: docker-operator-image-unstripped docker-operator-aws-image-unstripped docker-operator-azure-image-unstripped docker-operator-alibabacloud-image-unstripped docker-operator-generic-image-unstripped ## Build all variants of unstripped cilium-operator images.