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#############################################################################
# Copyright (c) 2015 Ericsson AB and others.
# stefan.k.berg@ericsson.com
# jonas.bjurel@ericsson.com
# All rights reserved. This program and the accompanying materials
# are made available under the terms of the Apache License, Version 2.0
# which accompanies this distribution, and is available at
# http://www.apache.org/licenses/LICENSE-2.0
##############################################################################

SHELL = /bin/bash
CACHEVALIDATE := $(addsuffix .validate,$(SUBDIRS))
CACHECLEAN := $(addsuffix .clean,$(CACHEFILES) $(CACHEDIRS))

############################################################################
# BEGIN of variables to customize
#
CACHEFILES += .versions
CACHEFILES += $(shell basename $(ISOSRC))
#
# END of variables to customize
############################################################################

.PHONY: prepare-cache
prepare-cache: make-cache-dir $(CACHEDIRS) $(CACHEFILES)

.PHONY: make-cache-dir
make-cache-dir:
	@rm -rf ${CACHE_DIR}
	@mkdir ${CACHE_DIR}

.PHONY: clean-cache
clean-cache: $(CACHECLEAN)
	@rm -rf ${CACHE_DIR}

.PHONY: $(CACHEDIRS)
$(CACHEDIRS):
	@mkdir -p $(dir $(CACHE_DIR)/$@)
	@if [ ! -d $(BUILD_BASE)/$@ ]; then\
	   mkdir -p $(BUILD_BASE)/$@;\
	fi
	@ln -s $(BUILD_BASE)/$@ $(CACHE_DIR)/$@

.PHONY: $(CACHEFILES)
$(CACHEFILES):
	@mkdir -p $(dir $(CACHE_DIR)/$@)
	@if [ ! -d $(dir $(BUILD_BASE)/$@) ]; then\
	   mkdir -p $(dir $(BUILD_BASE)/$@);\
	fi

	@if [ ! -f $(BUILD_BASE)/$@ ]; then\
	   echo " " > $(BUILD_BASE)/$@;\
 	   ln -s $(BUILD_BASE)/$@ $(CACHE_DIR)/$@;\
	   rm -f $(BUILD_BASE)/$@;\
	else\
	   ln -s $(BUILD_BASE)/$@ $(CACHE_DIR)/$@;\
	fi

.PHONY: validate-cache
validate-cache: $(CACHEVALIDATE)
	@if [[ $(shell md5sum $(BUILD_BASE)/config.mk | cut -f1 -d " ") != $(shell cat $(VERSION_FILE) | grep config.mk | awk '{print $$NF}') ]]; then\
	   echo "Cache does not match current config.mk definition, cache must be rebuilt";\
	   exit 1;\
	fi;

	@if [[ $(shell md5sum $(BUILD_BASE)/cache.mk | cut -f1 -d " ") != $(shell cat $(VERSION_FILE) | grep cache.mk | awk '{print $$NF}') ]]; then\
	   echo "Cache does not match current cache.mk definition, cache must be rebuilt";\
	   exit 1;\
	fi;

.PHONY: $(CACHEVALIDATE)
$(CACHEVALIDATE): %.validate:
	@echo VALIDATE $(CACHEVALIDATE)
	$(MAKE) -C $* -f Makefile validate-cache

.PHONY: $(CACHECLEAN)
$(CACHECLEAN): %.clean:
	rm -rf ${CACHE_DIR}/$*