+ rm -f .docker* ubuntu-builder/Dockerfile
+
+.PHONY: deepclean
+deepclean: clean clean-cache
+
+##############################################################################
+# Cache operations - only used when building through ci/build.sh
+##############################################################################
+
+# NOTE: For docker, we only get/put cache to fingerprint build scripts and
+# env vars, its cached data holds only an empty .docker file.
+
+# Create a unique hash to be used for getting and putting cache, based on:
+# - ubuntu-builder Dockerfile (includes eventual proxy env vars), runcontext;
+# - The contents of this Makefile
+.cacheid: .dockercfg
+ sha1sum Makefile runcontext $(wildcard ubuntu-builder/*) > .cachedata
+ cat .cachedata | $(CACHETOOL) getid > .cacheid
+
+# Clean local data related to caching - called prior to ordinary build
+.PHONY: clean-cache
+clean-cache:
+ rm -f .cachedata .cacheid
+
+# Try to download cache - called prior to ordinary build
+.PHONY: get-cache
+get-cache: .cacheid
+ @if $(CACHETOOL) check $(shell cat .cacheid); then \
+ if test "$(shell ${DOCKER_EXPIRED})" -eq "0"; then \
+ echo "Docker: Tag '${DOCKER_TAG}' missing" \
+ "or older than ${DOCKER_KEEP}, not using it."; \
+ else \
+ touch .docker; \
+ fi; \
+ else \
+ echo "No cache item found for $(shell cat .cacheid)" ;\
+ exit 0;\
+ fi
+
+# Store cache if not already stored - called after ordinary build
+.PHONY: put-cache
+put-cache: .cacheid
+ @tar cf - .docker | $(CACHETOOL) put $(shell cat .cacheid)