VERSION  ?= $(shell head -1 VERSIONS)
PVERSION ?= 1
ARCH     ?= x86_64
suffix   := $(subst -x86_64,,-$(ARCH))

FILES = $(shell find files/ -type f)
DIR   = build/$(VERSION)/$(ARCH)
OUT   = build/k3s_$(VERSION)_$(ARCH).opk

define CONTROL
Package: k3s
Version: ${VERSION}-${PVERSION}
Architecture: $(ARCH)
Maintainer: Johannes 'fish' Ziemke
Depends: iptables iptables-mod-extra kmod-ipt-extra iptables-mod-extra kmod-br-netfilter ca-certificates
Description: The Docker Engine packages for OpenWrt
endef
export CONTROL

.PHONY: all
all: $(OUT)

build-all:
	if [ -n "$$(ls build/)" ]; then echo build/ not empty && exit 1; fi
	for a in $$(cat ARCHS); do \
		for v in $$(cat VERSIONS); do \
			make ARCH=$$a VERSION=$$v; \
		done; \
	done

.PHONY: release
release: build-all
	ghr -t ${GITHUB_TOKEN} -u ${CIRCLE_PROJECT_USERNAME} -r ${CIRCLE_PROJECT_REPONAME} \
		-c ${CIRCLE_SHA1} -delete ${PVERSION} build/

$(OUT): $(DIR)/pkg/control.tar.gz $(DIR)/pkg/data.tar.gz $(DIR)/pkg/debian-binary
	tar -C $(DIR)/pkg -czvf "$@" debian-binary data.tar.gz control.tar.gz

$(DIR)/data: $(FILES)
	mkdir -p "$@/usr/bin"
	cp -r files/* "$@"
	curl -sfLo "$@/usr/bin/k3s" \
		https://github.com/k3s-io/k3s/releases/download/v$(VERSION)/k3s${suffix}
	chmod a+x "$@/usr/bin/k3s"

$(DIR)/pkg/data.tar.gz: $(DIR)/data
	tar -C "$<" -czvf "$@" .

$(DIR)/pkg:
	mkdir -p $@

$(DIR)/pkg/debian-binary: $(DIR)/pkg
	echo 2.0 > $@

$(DIR)/pkg/control: $(DIR)/pkg
	echo "$$CONTROL" > "$@"

$(DIR)/pkg/control.tar.gz: $(DIR)/pkg/control
	tar -C $(DIR)/pkg -czvf "$@" control

.PHONY: clean
clean:
	rm -rf build/