Extract a system-as-root update.zip

Makefile

SOURCE := $(TARGET).zip

MOUNT := $(TARGET)/.mount

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

PAYLOAD_BIN := $(TARGET)/payload.bin

BOOT_IMG := $(TARGET)/boot.img
SYSTEM_IMG := $(TARGET)/system.img
VENDOR_IMG := $(TARGET)/vendor.img

UNPACK := ~/android/packing/unpack.sh
EXTRACT := python ~/android/extract_android_ota_payload/extract_android_ota_payload.py

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

define extract-ext4-image
	mkdir -p $(MOUNT)
	ext4fuse $(1) $(MOUNT)
	cp -Rvf $(MOUNT) $(2)
	umount $(MOUNT)
	chown -R XiNGRZ:staff $(2)
	chmod -R +r $(2)
	chmod +w $(2)
endef

.PHONY: unpack
unpack: $(BOOT) $(ROOT) $(VENDOR)

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

$(ROOT): $(SYSTEM_IMG)
	$(call extract-ext4-image,$(SYSTEM_IMG),$@)
	rm -f $(SYSTEM_IMG)
	rm -rf $(VENDOR)

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

$(SYSTEM_IMG): $(BOOT_IMG)
$(VENDOR_IMG): $(BOOT_IMG)

$(BOOT_IMG): $(PAYLOAD_BIN)
	$(EXTRACT) $(PAYLOAD_BIN) $(dir $@)

$(PAYLOAD_BIN): $(TARGET)

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

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