HASH_TYPE := sha512
HASH_TOOL ?= $(SHA512SUM)

SED_FLAG = -i
ifeq ($(NATIVE_OS), osx)
  HASH_TOOL = $(SHASUM) -a $(shell echo $(HASH_TYPE) | sed 's/^sha//')
  SED_FLAG = -i ''
endif

# non-depends builds might not set this, use defaults
ifeq ($(HASH_TOOL),)
  HASH_TOOL = sha512sum
  HASH_TOOL_FLAGS = -c --status
endif

.PHONY: all download

all: download

FULL_URL ?= $(BASE_URL)/$(ARCHIVE)

$(TARBALLS_LOCATION)/$(ARCHIVE).$(HASH_TYPE): download

download:
	@{\
          cd $(TARBALLS_LOCATION) ;\
          if [ -f "$(ARCHIVE)" ]; then \
            HASH_SUM="$$($(HASH_TOOL) $(ARCHIVE) | cut -f 1 -d " ")" ;\
            if [ "$${HASH_SUM}" = "$(SHA512)" ]; then \
              $(HASH_TOOL) $(ARCHIVE) > $(ARCHIVE).$(HASH_TYPE) ;\
              exit 0 ;\
            else \
              echo "corrupt archive found $(ARCHIVE) - redownloading" ;\
            fi ;\
          fi ;\
          ATTEMPTS=1 ;\
          while [ "$${ATTEMPTS}" -le 3 ]; do \
            echo "download $(ARCHIVE) attempt $$ATTEMPTS" ;\
            $(RETRIEVE_TOOL) $(RETRIEVE_TOOL_FLAGS) $(ARCHIVE) $(FULL_URL) ;\
            HASH_SUM="$$($(HASH_TOOL) $(ARCHIVE) | cut -f 1 -d " ")" ;\
            if [ "$${HASH_SUM}" = "$(SHA512)" ]; then \
              $(HASH_TOOL) $(ARCHIVE) > $(ARCHIVE).$(HASH_TYPE) ;\
              exit 0 ;\
            fi ;\
            ATTEMPTS=$$((ATTEMPTS + 1)) ;\
            echo "Error: failed to verify hash sum of $(ARCHIVE)" ;\
            echo "Expected type   : $(HASH_TYPE)" ;\
            echo "Found value     : $${HASH_SUM}" ;\
            echo "Expected value  : $(SHA512)" ;\
            echo "retrying.." ;\
            rm $(ARCHIVE) ;\
            sleep 3 ;\
          done ;\
          exit 1 ;\
        }