genode/tool/depot/mk/downloader

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#!/usr/bin/make -f
#
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# \brief Download, verify, and extract depot archives
# \author Norman Feske
# \date 2017-03-23
#
export GENODE_DIR := $(realpath $(dir $(MAKEFILE_LIST))/../../..)
PUBLIC_DIR ?= $(GENODE_DIR)/public
DEPOT_DIR ?= $(GENODE_DIR)/depot
DEPOT_TOOL_DIR ?= $(GENODE_DIR)/tool/depot
define HELP_MESSAGE
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Download, verify, and extract depot archives
usage:
$(firstword $(MAKEFILE_LIST)) <archive-path>...
endef
include $(DEPOT_TOOL_DIR)/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 $(DEPOT_TOOL_DIR)/mk/gpg.inc
$(DEPOT_DIR)/% : $(PUBLIC_DIR)/%.tar.xz $(PUBLIC_DIR)/%.tar.xz.sig
$(VERBOSE)pubkey_file=$(call pubkey_path,$*); \
$(GPG) --yes -o $$pubkey_file.dearmored --dearmor $$pubkey_file; \
( $(GPG) --no-tty --no-default-keyring \
--keyring $$pubkey_file.dearmored \
--verify $(PUBLIC_DIR)/$*.tar.xz.sig 2> /dev/null; retval=$$?; \
rm -f $$pubkey_file.dearmored; \
exit $$retval \
) || ( echo -e "Error: could not verify '$*', signature does not match\n" \
" public key '$$pubkey_file'"; \
false )
$(VERBOSE)mkdir -p $(dir $@)
$(VERBOSE)tar xfJ $(PUBLIC_DIR)/$*.tar.xz -C $(dir $@)
DOWNLOADED_FILES := $(addprefix $(PUBLIC_DIR)/,$(MAKECMDGOALS:=.tar.xz)) \
$(addprefix $(PUBLIC_DIR)/,$(MAKECMDGOALS:=.tar.xz.sig))
.PRECIOUS: $(DOWNLOADED_FILES)
ifneq ($(MISSING_PUBKEY_FILES),)
$(DOWNLOADED_FILES): missing_pubkey_files
endif
#
# Determine download URLs of all origins of the specified archives
#
# The 'ORIGINS' variable contains all users found in the arguments. The
# URL information is obtained from the despective depot/<user>/download
# file and cached in the 'URL(<user>)' variable. The 'file_url' function
# assesses the 'URL' variables to return the complete URL for a given
# relative archive (or signature file) path.
#
ORIGINS := $(sort $(foreach A,$(ARCHIVES),$(call archive_user,$A)))
# return 'download' file located side by side of a given 'pubkey' file
url_file_for_pubkey_file = $(wildcard $(1:pubkey=download))
# return path to 'download' file for a given archive
url_file_path = $(call url_file_for_pubkey_file,$(call pubkey_path,$1))
quotation_sanitized = $(subst ',,$(strip $1))
$(foreach O,$(ORIGINS),\
$(eval URL($O) := \
$(call quotation_sanitized,\
$(call file_content,$(call url_file_path,$O)))))
MISSING_DOWNLOAD_LOCATIONS := $(sort $(foreach O,$(ORIGINS),\
$(if ${URL($O)},,$O)))
ifneq ($(MISSING_DOWNLOAD_LOCATIONS),)
$(DOWNLOADED_FILES): missing_download_locations
endif
missing_download_locations:
@echo "Error: missing or invalid download location:";\
for i in $(MISSING_DOWNLOAD_LOCATIONS); do echo " $$i"; done; false
file_url = '${URL($(call archive_user,$1))}/$1'
#
# Download rule that is invoked per file
#
$(PUBLIC_DIR)/%:
@$(ECHO) "$(DARK_COL)download$(DEFAULT_COL) $*"
$(VERBOSE)mkdir -p $(dir $@)
$(VERBOSE)wget --quiet --no-check-certificate $(call file_url,$*) -O $@ ||\
(echo "Error: failed to download $(call file_url,$*)"; rm -f $@; false)
$(MAKECMDGOALS): $(TARGETS)
@true