#!/usr/bin/make -f

#
# \brief  Simulate the download of files by copying content from a directory
# \author Norman Feske
# \date   2017-03-23
#

export GENODE_DIR := $(realpath $(dir $(MAKEFILE_LIST))/../../..)

REMOTE_DIR ?= $(GENODE_DIR)/remote
PUBLIC_DIR ?= $(GENODE_DIR)/public
DEPOT_DIR  ?= $(GENODE_DIR)/depot

define HELP_MESSAGE

  Simulate the download of files by copying content from a directory

  usage:

    $(firstword $(MAKEFILE_LIST)) <archive-path>...

endef

include $(GENODE_DIR)/tool/depot/mk/front_end.inc

TARGETS := $(addprefix $(DEPOT_DIR)/,$(MAKECMDGOALS))


#
# Unpack after checking signature against public key as stored in the depot
#
# Unfortunately, gpg does not allow us to specify the armored public-key
# file directly as keyring for the verify operation. So we need to create a
# temporary dearmored version.
#

ARCHIVES := $(MAKECMDGOALS)

include $(GENODE_DIR)/tool/depot/mk/gpg.inc

$(DEPOT_DIR)/% : $(PUBLIC_DIR)/%.tgz $(PUBLIC_DIR)/%.tgz.gpg
	$(VERBOSE)pubkey_file=$(DEPOT_DIR)/$(call archive_user,$*)/pubkey; \
	          gpg --yes -o $$pubkey_file.dearmored --dearmor $$pubkey_file; \
	          ( gpg --no-tty --no-default-keyring \
	                --keyring $$pubkey_file.dearmored \
	                --verify $(PUBLIC_DIR)/$*.tgz.gpg 2> /dev/null; retval=$$?; \
	            rm -f $$pubkey_file.dearmored; \
	            exit $$retval \
	          ) || ( echo -e "Error: could not verify '$*', signature does not match\n" \
	                          "      public key '$$pubkey_file'"; \
	                 false )
	$(VERBOSE)mkdir -p $(dir $@)
	$(VERBOSE)tar xfz $(PUBLIC_DIR)/$*.tgz -C $(dir $@)

DOWNLOADED_FILES := $(addprefix $(PUBLIC_DIR)/,$(MAKECMDGOALS:=.tgz)) \
                    $(addprefix $(PUBLIC_DIR)/,$(MAKECMDGOALS:=.tgz.gpg))

.PRECIOUS: $(DOWNLOADED_FILES)

ifneq ($(MISSING_PUBKEY_FILES),)
$(DOWNLOADED_FILES): missing_pubkey_files
endif

$(PUBLIC_DIR)/%:
	@$(ECHO) "$(DARK_COL)download$(DEFAULT_COL) $*"
	$(VERBOSE)mkdir -p $(dir $@)
	$(VERBOSE)cp $(REMOTE_DIR)/$* $@

$(MAKECMDGOALS): $(TARGETS)
	@true