Extract an update.zip

Makefile

SOURCE := $(TARGET).zip

MOUNT := $(TARGET)/.mount

BOOT := $(TARGET)/boot
SYSTEM := $(TARGET)/system
VENDOR := $(SYSTEM)/vendor

BOOT_IMG := $(TARGET)/boot.img

SYSTEM_IMG := $(TARGET)/system.img
SYSTEM_DAT := $(TARGET)/system.new.dat
SYSTEM_LST := $(TARGET)/system.transfer.list
ifneq (false,$(USE_BROTLI))
SYSTEM_BRO := $(SYSTEM_DAT).br
endif

VENDOR_IMG := $(TARGET)/vendor.img
VENDOR_DAT := $(TARGET)/vendor.new.dat
VENDOR_LST := $(TARGET)/vendor.transfer.list
ifneq (false,$(USE_BROTLI))
VENDOR_BRO := $(VENDOR_DAT).br
endif

UNPACK := ~/android/packing/unpack.sh
SDAT2IMG := ~/android/mokee-next/vendor/mk/build/tools/sdat2img.py

ifeq (,$(shell which brotli))
  $(error `brotli` not found.)
endif

define extract-ext4-image
	vagrant ssh -c "mkdir -p ~/mount && rsync --progress /vagrant/$(1) ~/source.img && sudo mount -t ext4 ~/source.img ~/mount && sudo cp -Rvf ~/mount /vagrant/$(2) && sudo umount ~/mount && rm ~/source.img"
	chown -R $(shell id -un):$(shell id -gn) $(2)
	chmod -R +r $(2)
	chmod +w $(2)
endef

HAS_VENDOR := $(if $(strip $(shell unzip -l $(SOURCE) | grep 'vendor')),true,false)
USE_BROTLI := $(if $(strip $(shell unzip -l $(SOURCE) | grep '.dat.br')),true,false)

$(info SOURCE: $(SOURCE))
$(info HAS_VENDOR: $(HAS_VENDOR))
$(info USE_BROTLI: $(USE_BROTLI))

TARGETS := $(BOOT) $(SYSTEM)
ifneq (false,$(HAS_VENDOR))
	TARGETS += $(VENDOR)
endif

.PHONY: unpack
unpack: $(TARGETS)
	rm -f $(SYSTEM_DAT) $(SYSTEM_LST)
ifneq (false,$(HAS_VENDOR))
	rm -f $(VENDOR_DAT) $(VENDOR_LST)
endif
ifneq (false,$(USE_BROTLI))
	rm -f $(SYSTEM_BRO) $(VENDOR_BRO)
endif
	@echo "=== Done ==="

$(BOOT): $(BOOT_IMG)
	pushd $(dir $@) && $(UNPACK) $(notdir $^) && popd

$(SYSTEM): $(SYSTEM_IMG)
	$(call extract-ext4-image,$(SYSTEM_IMG),$@)
	rm -f $(SYSTEM_IMG)
ifneq (false,$(HAS_VENDOR))
	rm -rf $(VENDOR)
endif

$(VENDOR): $(VENDOR_IMG) $(SYSTEM)
	$(call extract-ext4-image,$(VENDOR_IMG),$@)
	rm -f $(VENDOR_IMG)

$(SYSTEM_IMG): $(SYSTEM_LST) $(SYSTEM_DAT)
	$(SDAT2IMG) $^ $@

$(VENDOR_IMG): $(VENDOR_LST) $(VENDOR_DAT)
	$(SDAT2IMG) $^ $@

ifneq (false,$(USE_BROTLI))
$(SYSTEM_DAT): $(SYSTEM_BRO)
	brotli --decompress --output=$@ $^

$(VENDOR_DAT): $(VENDOR_BRO)
	brotli --decompress --output=$@ $^
endif

$(BOOT_IMG): $(TARGET)
ifneq (false,$(USE_BROTLI))
$(SYSTEM_BRO): $(TARGET)
$(VENDOR_BRO): $(TARGET)
else
$(SYSTEM_DAT): $(TARGET)
$(VENDOR_DAT): $(TARGET)
endif

$(TARGET): $(SOURCE)
	mkdir -p $@
	unzip $^ -d $@

.PHONY: clean
clean:
	rm -rf $(TARGET)