kuma

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# Explanation of used GNU Make concepts used in the file:
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#
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# "| $(DIRECTORY_NAME)" is an order-only prerequisite, which means prerequisite
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#   that is never checked when determining if the target is out of date;
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#   even order-only prerequisites marked as phony will not cause the target
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#   to be rebuilt. In our case it's used to make $(DIRECTORY_NAME) directory,
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#   if it doesn't exist.
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# ref. https://www.gnu.org/software/make/manual/html_node/Prerequisite-Types.html
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#
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# "$(@D)" is the directory part of the file name of the target, with the trailing
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#   slash removed. If the value of $(@) is "dir/foo.o" then $(@D) will be
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#   equal "dir". This value will be equal "." if $(@) does not contain a slash.
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# ref. https://www.gnu.org/software/make/manual/html_node/Automatic-Variables.html#Automatic-Variables
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RELEASE_TAG ?= main-dd8b1946a31a8ce03009a2743b18ebcc716cda61
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RELEASE_REPO ?= https://github.com/kumahq/merbridge
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# You can provide your own url if the tarball with all ebpf programs should be
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# fetched from somewhere else
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TARBALL_URL ?= $(RELEASE_REPO)/releases/download/$(RELEASE_TAG)
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# Where should be placed directory with $(RELEASE_TAG) as name placed. We don't
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# allow to overwrite the final $(BUILD_OUTPUT) variable,  because without $(RELEASE_TAG) and $(GOARCH), it may result in situation
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# where without realizing, ebpf programs are not re-fetched when $(RELEASE_TAG) or $(GOARCH) changes
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BASE_BUILD_OUTPUT = build/ebpf/$(RELEASE_TAG)
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# Path where ebpf programs should be placed, to be compiled in when building kumactl
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COMPILE_IN_PATH ?= ./pkg/transparentproxy/ebpf/programs
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# We are placing ebpf programs inside $(BUILD_OUTPUT_WITH_TAG) directory first,
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# as by default it contains $(RELEASE_TAG) in the path, which means
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# if the tag changes, we will re-fetch programs
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define make_ebpf_targets
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$(1)/mb_*: | $(1)
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	curl --progress-bar --location $(TARBALL_URL)/all-$(3).tar.gz | tar -C $$(@D) -xz
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$(2)/mb_*: | $(2) $(1)/mb_*
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	cp $(1)/mb_* $(2)
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# Make $(2) $(1) directories if they don't
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# exist
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$(1) $(2):
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	mkdir -p $$@
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endef
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EBF_ARCH:=amd64 arm64
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$(foreach elt,$(EBF_ARCH),$(eval $(call make_ebpf_targets,$(BASE_BUILD_OUTPUT)/$(elt),$(COMPILE_IN_PATH)/$(elt),$(elt))))
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EBF_TARGETS:=$(foreach elt,$(EBF_ARCH),$(BASE_BUILD_OUTPUT)/$(elt)/mb_* $(COMPILE_IN_PATH)/$(elt)/mb_*)
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.PHONY: build/ebpf
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build/ebpf: $(EBF_TARGETS)
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.PHONY: clean/ebpf
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clean/ebpf :
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	-rm -rf $(BUILD_DIR)/ebpf
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	find $(COMPILE_IN_PATH) -type f -name 'mb_*' -exec rm {} \;
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