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-rw-r--r--build/cache.mk78
1 files changed, 78 insertions, 0 deletions
diff --git a/build/cache.mk b/build/cache.mk
new file mode 100644
index 00000000..fdfd0034
--- /dev/null
+++ b/build/cache.mk
@@ -0,0 +1,78 @@
+##############################################################################
+# 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 ${CACHE_DIR}/$*