#!/usr/bin/make -f

#
# \brief  Tool for assembling a package archive
# \author Norman Feske
# \date   2017-03-17
#

define HELP_MESSAGE

  Compress and sign depot content for publishing

  usage:

    $(firstword $(MAKEFILE_LIST)) <archive-path> {PUBLIC_DIR=<public>}

  The <archive-path> denotes the archives (and implicitly their
  dependencies) to publish from the depot to the public directory.
  It must be given including the version number of the package archive.

  This tool does not touch any Genode source repository. It solely
  reads from the depot and writes to the public directory.

  The optional 'PUBLIC_DIR' argument defines the location of the public
  directory. If not specified, '<genode-dir>/public/' is used.

endef

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

PUBLIC_DIR     ?= $(GENODE_DIR)/public
DEPOT_TOOL_DIR ?= $(GENODE_DIR)/tool/depot

XZ_THREADS ?= 1

include $(DEPOT_TOOL_DIR)/mk/front_end.inc


#
# Determine dependencies, check for completeness
#

ifneq ($(MAKECMDGOALS),)
DEPENDENCIES_CMD := $(DEPOT_TOOL_DIR)/dependencies DEPOT_DIR="$(DEPOT_DIR)" \
                                                   DEPOT_TOOL_DIR="$(DEPOT_TOOL_DIR)" \
                                                   $(MAKECMDGOALS)
DEPENDENCIES_RESULT := $(shell $(DEPENDENCIES_CMD) 2> /dev/null || true)
endif

DEPENDENCIES_MISSING := $(sort $(foreach A, $(DEPENDENCIES_RESULT),\
                                  $(if $(wildcard $(PUBLIC_DIR)/$A.tar.xz.sig),,$A)))

ifeq ($(filter Error:,$(DEPENDENCIES_RESULT)),)
ARCHIVES := $(DEPENDENCIES_MISSING)
else
ARCHIVES :=
$(MAKECMDGOALS): dependencies_error
endif

# re-execute the dependencies command to present the error to the user
dependencies_error:
	@$(DEPENDENCIES_CMD)

TARGETS += $(addsuffix .tar.xz.sig,$(addprefix $(PUBLIC_DIR)/,$(ARCHIVES)))


#
# Determine to-be-published index files from MAKECMDGOALS
#

INDEX_FILES := $(foreach A,$(MAKECMDGOALS),\
  $(if $(call archive_has_type,$A,index),$A,))

INDEX_FILES_MISSING := $(sort $(foreach I, $(INDEX_FILES),\
                          $(if $(wildcard $(DEPOT_DIR)/$I),,$I)))

ifneq ($(INDEX_FILES_MISSING),)
$(MAKECMDGOALS): index_missing_error
else
TARGETS += $(addsuffix .xz.sig,$(addprefix $(PUBLIC_DIR)/,$(INDEX_FILES)))
endif

index_missing_error:
	@echo "Error: missing depot content: $(INDEX_FILES_MISSING)"; false


#
# Generate compressed and signed archives and index files
#

include $(DEPOT_TOOL_DIR)/mk/gpg.inc

MISSING_PUBKEY_FILES := $(sort \
                           $(foreach A,$(ARCHIVES),\
                              $(if $(call pubkey_path,$A),,\
                                 $(call pubkey_filename,$A))))

$(PUBLIC_DIR)/%.xz.sig : $(PUBLIC_DIR)/%.xz
	$(VERBOSE)$(GPG) --detach-sign --digest-algo SHA256 --no-tty --use-agent \
	              --local-user $(call pubkey_id,$*) - < $< > $@ || \
	              ( rm -f $@; false )

.PRECIOUS: $(TARGETS:.xz.sig=.xz)

# archive
$(PUBLIC_DIR)/%.tar.xz: $(DEPOT_DIR)/%
	@$(ECHO) "$(DARK_COL)publish$(DEFAULT_COL) $@"
	$(VERBOSE)test -e $(dir $@) || mkdir -p $(dir $@)
	$(VERBOSE)tar cf - -C $(dir $<) $(notdir $<) | \
	          xz --threads=$(XZ_THREADS) > $@

# index file
$(PUBLIC_DIR)/%.xz: $(DEPOT_DIR)/%
	@$(ECHO) "$(DARK_COL)publish$(DEFAULT_COL) $@"
	$(VERBOSE)test -e $(dir $@) || mkdir -p $(dir $@)
	$(VERBOSE)xz --threads=$(XZ_THREADS) <$< >$@

ifneq ($(MISSING_PUBKEY_FILES),)
$(MAKECMDGOALS) $(TARGETS): missing_pubkey_files
endif

$(MAKECMDGOALS): $(TARGETS)
	@true