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diff --git a/build/cache.mk b/build/cache.mk
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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
+##############################################################################
+
+#############################################################################
+# Cache operations - only used when building through ci/build.sh
+#
+# This is the global cache implementation, providing the main target "cache"
+# which is called from ci/build.sh, and recursively calling the cache
+# operations clean-cache, get-cache and put-cache on all $(SUBDIRS).
+#############################################################################
+
+
+export CACHETOOL := $(BUILD_BASE)/cache.sh
+
+# Call sub caches
+SUBGETCACHE = $(addsuffix .getcache,$(SUBDIRS))
+$(SUBGETCACHE): %.getcache:
+ $(MAKE) -C $* -f Makefile get-cache
+
+SUBPUTCACHE = $(addsuffix .putcache,$(SUBDIRS))
+$(SUBPUTCACHE): %.putcache:
+ $(MAKE) -C $* -f Makefile put-cache
+
+SUBCLEANCACHE = $(addsuffix .cleancache,$(SUBDIRS))
+$(SUBCLEANCACHE): %.cleancache:
+ $(MAKE) -C $* -f Makefile clean-cache
+
+# Overlay implementation:
+# - clean
+# - clean cache identities
+# - get caches
+# - build iso
+# - store caches
+.PHONY: cached-all
+cached-all: clean clean-cache $(SUBCLEANCACHE) get-cache $(SUBGETCACHE) iso put-cache $(SUBPUTCACHE)
+ @echo "Cached build is complete"
+
+
+# cache: The target for ci/build.sh
+.PHONY: cache
+cache:
+ @if [ -z "${CACHEBASE}" ]; then \
+ echo "CACHEBASE not set, are you really building through build.sh?"; \
+ exit 1; \
+ fi
+ @docker version >/dev/null 2>&1 || (echo 'No Docker installation available'; exit 1)
+ @make -C docker
+ docker/runcontext $(DOCKERIMG) $(MAKE) $(MAKEFLAGS) cached-all