package/pkg-utils.mk - buildroot - Git at Google

 ################################################################################
 #
 # This file contains various utility functions used by the package
 # infrastructure, or by the packages themselves.
 #
 ################################################################################

 #
 # Manipulation of .config files based on the Kconfig
 # infrastructure. Used by the BusyBox package, the Linux kernel
 # package, and more.
 #

 define KCONFIG_ENABLE_OPT # (option, file)
 	$(SED) "/\\<$(1)\\>/d" $(2)
 	echo '$(1)=y' >> $(2)
 endef

 define KCONFIG_SET_OPT # (option, value, file)
 	$(SED) "/\\<$(1)\\>/d" $(3)
 	echo '$(1)=$(2)' >> $(3)
 endef

 define KCONFIG_DISABLE_OPT # (option, file)
 	$(SED) "/\\<$(1)\\>/d" $(2)
 	echo '# $(1) is not set' >> $(2)
 endef

 # Helper functions to determine the name of a package and its
 # directory from its makefile directory, using the $(MAKEFILE_LIST)
 # variable provided by make. This is used by the *-package macros to
 # automagically find where the package is located.
 pkgdir = $(dir $(lastword $(MAKEFILE_LIST)))
 pkgname = $(lastword $(subst /, ,$(pkgdir)))

 # Define extractors for different archive suffixes
 INFLATE.bz2  = $(BZCAT)
 INFLATE.gz   = $(ZCAT)
 INFLATE.lz   = $(LZCAT)
 INFLATE.lzma = $(XZCAT)
 INFLATE.tbz  = $(BZCAT)
 INFLATE.tbz2 = $(BZCAT)
 INFLATE.tgz  = $(ZCAT)
 INFLATE.xz   = $(XZCAT)
 INFLATE.tar  = cat
 # suitable-extractor(filename): returns extractor based on suffix
 suitable-extractor = $(INFLATE$(suffix $(1)))

 EXTRACTOR_PKG_DEPENDENCY.lzma = $(BR2_XZCAT_HOST_DEPENDENCY)
 EXTRACTOR_PKG_DEPENDENCY.xz   = $(BR2_XZCAT_HOST_DEPENDENCY)
 EXTRACTOR_PKG_DEPENDENCY.lz   = $(BR2_LZIP_HOST_DEPENDENCY)

 # extractor-pkg-dependency(filename): returns a Buildroot package
 # dependency needed to extract file based on suffix
 extractor-pkg-dependency = $(EXTRACTOR_PKG_DEPENDENCY$(suffix $(1)))

 # extractor-system-dependency(filename): returns the name of the tool
 # needed to extract 'filename', and is meant to be used with
 # DL_TOOLS_DEPENDENCIES, in order to check that the necesary tool is
 # provided by the system Buildroot runs on.
 #
 # $(firstword) is used here because the extractor can have arguments,
 # like ZCAT="gzip -d -c", and to check for the dependency we only want
 # 'gzip'.
 extractor-system-dependency = $(if $(EXTRACTOR_PKG_DEPENDENCY$(suffix $(1))),,\
 	$(firstword $(INFLATE$(suffix $(1)))))

 # check-deprecated-variable -- throw an error on deprecated variables
 # example:
 #   $(eval $(call check-deprecated-variable,FOO_MAKE_OPT,FOO_MAKE_OPTS))
 define check-deprecated-variable # (deprecated var, new var)
 ifneq ($$(origin $(1)),undefined)
 $$(error Package error: use $(2) instead of $(1). Please fix your .mk file)
 endif
 endef

 # $(1): YES or NO
 define yesno-to-bool
 	$(subst NO,false,$(subst YES,true,$(1)))
 endef

 # json-info -- return package or filesystem metadata formatted as an entry
 #              of a JSON dictionnary
 # $(1): upper-case package or filesystem name
 define json-info
 	"$($(1)_NAME)": {
 		"type": "$($(1)_TYPE)",
 		$(if $(filter rootfs,$($(1)_TYPE)), \
 			$(call _json-info-fs,$(1)), \
 			$(call _json-info-pkg,$(1)), \
 		)
 	}
 endef

 # _json-info-pkg, _json-info-pkg-details, _json-info-fs: private helpers
 # for json-info, above
 define _json-info-pkg
 	$(if $($(1)_IS_VIRTUAL), \
 		"virtual": true$(comma),
 		"virtual": false$(comma)
 		$(call _json-info-pkg-details,$(1)) \
 	)
 	"dependencies": [
 		$(call make-comma-list,$(sort $($(1)_FINAL_ALL_DEPENDENCIES)))
 	],
 	"reverse_dependencies": [
 		$(call make-comma-list,$(sort $($(1)_RDEPENDENCIES)))
 	]
 endef

 define _json-info-pkg-details
 	"version": "$($(1)_DL_VERSION)",
 	"licenses": "$($(1)_LICENSE)",
 	"dl_dir": "$($(1)_DL_SUBDIR)",
 	"install_target": $(call yesno-to-bool,$($(1)_INSTALL_TARGET)),
 	"install_staging": $(call yesno-to-bool,$($(1)_INSTALL_STAGING)),
 	"install_images": $(call yesno-to-bool,$($(1)_INSTALL_IMAGES)),
 	"downloads": [
 	$(foreach dl,$(sort $($(1)_ALL_DOWNLOADS)),
 		{
 			"source": "$(notdir $(dl))",
 			"uris": [
 				$(call make-comma-list,
 					$(subst \|,|,
 						$(call DOWNLOAD_URIS,$(dl),$(1))
 					)
 				)
 			]
 		},
 	)
 	],
 endef

 define _json-info-fs
 	"dependencies": [
 		$(call make-comma-list,$(sort $($(1)_DEPENDENCIES)))
 	]
 endef

 # clean-json -- cleanup pseudo-json into clean json:
 #  - remove commas before closing ] and }
 #  - minify with $(strip)
 clean-json = $(strip \
 	$(subst $(comma)},}, $(subst $(comma)$(space)},$(space)}, \
 	$(subst $(comma)],], $(subst $(comma)$(space)],$(space)], \
 		$(strip $(1)) \
 	)))) \
 )

 ifeq ($(BR2_PER_PACKAGE_DIRECTORIES),y)
 # rsync the contents of per-package directories
 # $1: space-separated list of packages to rsync from
 # $2: 'host' or 'target'
 # $3: destination directory
 define per-package-rsync
 	mkdir -p $(3)
 	$(foreach pkg,$(1),\
 		rsync -a --link-dest=$(PER_PACKAGE_DIR)/$(pkg)/$(2)/ \
 		$(PER_PACKAGE_DIR)/$(pkg)/$(2)/ \
 		$(3)$(sep))
 endef

 # prepares the per-package HOST_DIR and TARGET_DIR of the current
 # package, by rsync the host and target directories of the
 # dependencies of this package. The list of dependencies is passed as
 # argument, so that this function can be used to prepare with
 # different set of dependencies (download, extract, configure, etc.)
 #
 # $1: space-separated list of packages to rsync from
 define prepare-per-package-directory
 	$(call per-package-rsync,$(1),host,$(HOST_DIR))
 	$(call per-package-rsync,$(1),target,$(TARGET_DIR))
 endef
 endif

 #
 # legal-info helper functions
 #
 LEGAL_INFO_SEPARATOR = "::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::"

 define legal-warning # text
 	echo "WARNING: $(1)" >>$(LEGAL_WARNINGS)
 endef

 define legal-warning-pkg # pkg, text
 	echo "WARNING: $(1): $(2)" >>$(LEGAL_WARNINGS)
 endef

 define legal-warning-nosource # pkg, {local|override}
 	$(call legal-warning-pkg,$(1),sources not saved ($(2) packages not handled))
 endef

 define legal-manifest # {HOST|TARGET}, pkg, version, license, license-files, source, url, dependencies
 	echo '"$(2)","$(3)","$(4)","$(5)","$(6)","$(7)","$(8)"' >>$(LEGAL_MANIFEST_CSV_$(1))
 endef

 define legal-license-file # pkgname, pkgname-pkgver, pkg-hashfile, filename, file-fullpath, {HOST|TARGET}
 	mkdir -p $(LICENSE_FILES_DIR_$(6))/$(2)/$(dir $(4)) && \
 	{ \
 		support/download/check-hash $(3) $(5) $(4); \
 		case $${?} in (0|3) ;; (*) exit 1;; esac; \
 	} && \
 	cp $(5) $(LICENSE_FILES_DIR_$(6))/$(2)/$(4)
 endef

 non-virtual-deps = $(foreach p,$(1),$(if $($(call UPPERCASE,$(p))_IS_VIRTUAL),,$(p)))

 # Returns the list of recursive dependencies and their licensing terms
 # for the package specified in parameter (in lowercase). If that
 # package is a target package, remove host packages from the list.
 legal-deps = \
     $(foreach p,\
         $(filter-out $(if $(1:host-%=),host-%),\
             $(call non-virtual-deps,\
                 $($(call UPPERCASE,$(1))_FINAL_RECURSIVE_DEPENDENCIES))),$(p) [$($(call UPPERCASE,$(p))_LICENSE)])
	################################################################################
	#
	# This file contains various utility functions used by the package
	# infrastructure, or by the packages themselves.
	#
	################################################################################

	#
	# Manipulation of .config files based on the Kconfig
	# infrastructure. Used by the BusyBox package, the Linux kernel
	# package, and more.
	#

	define KCONFIG_ENABLE_OPT # (option, file)
	$(SED) "/\\<$(1)\\>/d" $(2)
	echo '$(1)=y' >> $(2)
	endef

	define KCONFIG_SET_OPT # (option, value, file)
	$(SED) "/\\<$(1)\\>/d" $(3)
	echo '$(1)=$(2)' >> $(3)
	endef

	define KCONFIG_DISABLE_OPT # (option, file)
	$(SED) "/\\<$(1)\\>/d" $(2)
	echo '# $(1) is not set' >> $(2)
	endef

	# Helper functions to determine the name of a package and its
	# directory from its makefile directory, using the $(MAKEFILE_LIST)
	# variable provided by make. This is used by the *-package macros to
	# automagically find where the package is located.
	pkgdir = $(dir $(lastword $(MAKEFILE_LIST)))
	pkgname = $(lastword $(subst /, ,$(pkgdir)))

	# Define extractors for different archive suffixes
	INFLATE.bz2 = $(BZCAT)
	INFLATE.gz = $(ZCAT)
	INFLATE.lz = $(LZCAT)
	INFLATE.lzma = $(XZCAT)
	INFLATE.tbz = $(BZCAT)
	INFLATE.tbz2 = $(BZCAT)
	INFLATE.tgz = $(ZCAT)
	INFLATE.xz = $(XZCAT)
	INFLATE.tar = cat
	# suitable-extractor(filename): returns extractor based on suffix
	suitable-extractor = $(INFLATE$(suffix $(1)))

	EXTRACTOR_PKG_DEPENDENCY.lzma = $(BR2_XZCAT_HOST_DEPENDENCY)
	EXTRACTOR_PKG_DEPENDENCY.xz = $(BR2_XZCAT_HOST_DEPENDENCY)
	EXTRACTOR_PKG_DEPENDENCY.lz = $(BR2_LZIP_HOST_DEPENDENCY)

	# extractor-pkg-dependency(filename): returns a Buildroot package
	# dependency needed to extract file based on suffix
	extractor-pkg-dependency = $(EXTRACTOR_PKG_DEPENDENCY$(suffix $(1)))

	# extractor-system-dependency(filename): returns the name of the tool
	# needed to extract 'filename', and is meant to be used with
	# DL_TOOLS_DEPENDENCIES, in order to check that the necesary tool is
	# provided by the system Buildroot runs on.
	#
	# $(firstword) is used here because the extractor can have arguments,
	# like ZCAT="gzip -d -c", and to check for the dependency we only want
	# 'gzip'.
	extractor-system-dependency = $(if $(EXTRACTOR_PKG_DEPENDENCY$(suffix $(1))),,\
	$(firstword $(INFLATE$(suffix $(1)))))

	# check-deprecated-variable -- throw an error on deprecated variables
	# example:
	# $(eval $(call check-deprecated-variable,FOO_MAKE_OPT,FOO_MAKE_OPTS))
	define check-deprecated-variable # (deprecated var, new var)
	ifneq ($$(origin $(1)),undefined)
	$$(error Package error: use $(2) instead of $(1). Please fix your .mk file)
	endif
	endef

	# $(1): YES or NO
	define yesno-to-bool
	$(subst NO,false,$(subst YES,true,$(1)))
	endef

	# json-info -- return package or filesystem metadata formatted as an entry
	# of a JSON dictionnary
	# $(1): upper-case package or filesystem name
	define json-info
	"$($(1)_NAME)": {
	"type": "$($(1)_TYPE)",
	$(if $(filter rootfs,$($(1)_TYPE)), \
	$(call _json-info-fs,$(1)), \
	$(call _json-info-pkg,$(1)), \
	)
	}
	endef

	# _json-info-pkg, _json-info-pkg-details, _json-info-fs: private helpers
	# for json-info, above
	define _json-info-pkg
	$(if $($(1)_IS_VIRTUAL), \
	"virtual": true$(comma),
	"virtual": false$(comma)
	$(call _json-info-pkg-details,$(1)) \
	)
	"dependencies": [
	$(call make-comma-list,$(sort $($(1)_FINAL_ALL_DEPENDENCIES)))
	],
	"reverse_dependencies": [
	$(call make-comma-list,$(sort $($(1)_RDEPENDENCIES)))
	]
	endef

	define _json-info-pkg-details
	"version": "$($(1)_DL_VERSION)",
	"licenses": "$($(1)_LICENSE)",
	"dl_dir": "$($(1)_DL_SUBDIR)",
	"install_target": $(call yesno-to-bool,$($(1)_INSTALL_TARGET)),
	"install_staging": $(call yesno-to-bool,$($(1)_INSTALL_STAGING)),
	"install_images": $(call yesno-to-bool,$($(1)_INSTALL_IMAGES)),
	"downloads": [
	$(foreach dl,$(sort $($(1)_ALL_DOWNLOADS)),
	{
	"source": "$(notdir $(dl))",
	"uris": [
	$(call make-comma-list,
	$(subst \\|,\|,
	$(call DOWNLOAD_URIS,$(dl),$(1))
	)
	)
	]
	},
	)
	],
	endef

	define _json-info-fs
	"dependencies": [
	$(call make-comma-list,$(sort $($(1)_DEPENDENCIES)))
	]
	endef

	# clean-json -- cleanup pseudo-json into clean json:
	# - remove commas before closing ] and }
	# - minify with $(strip)
	clean-json = $(strip \
	$(subst $(comma)},}, $(subst $(comma)$(space)},$(space)}, \
	$(subst $(comma)],], $(subst $(comma)$(space)],$(space)], \
	$(strip $(1)) \
	)))) \
	)

	ifeq ($(BR2_PER_PACKAGE_DIRECTORIES),y)
	# rsync the contents of per-package directories
	# $1: space-separated list of packages to rsync from
	# $2: 'host' or 'target'
	# $3: destination directory
	define per-package-rsync
	mkdir -p $(3)
	$(foreach pkg,$(1),\
	rsync -a --link-dest=$(PER_PACKAGE_DIR)/$(pkg)/$(2)/ \
	$(PER_PACKAGE_DIR)/$(pkg)/$(2)/ \
	$(3)$(sep))
	endef

	# prepares the per-package HOST_DIR and TARGET_DIR of the current
	# package, by rsync the host and target directories of the
	# dependencies of this package. The list of dependencies is passed as
	# argument, so that this function can be used to prepare with
	# different set of dependencies (download, extract, configure, etc.)
	#
	# $1: space-separated list of packages to rsync from
	define prepare-per-package-directory
	$(call per-package-rsync,$(1),host,$(HOST_DIR))
	$(call per-package-rsync,$(1),target,$(TARGET_DIR))
	endef
	endif

	#
	# legal-info helper functions
	#
	LEGAL_INFO_SEPARATOR = "::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::"

	define legal-warning # text
	echo "WARNING: $(1)" >>$(LEGAL_WARNINGS)
	endef

	define legal-warning-pkg # pkg, text
	echo "WARNING: $(1): $(2)" >>$(LEGAL_WARNINGS)
	endef

	define legal-warning-nosource # pkg, {local\|override}
	$(call legal-warning-pkg,$(1),sources not saved ($(2) packages not handled))
	endef

	define legal-manifest # {HOST\|TARGET}, pkg, version, license, license-files, source, url, dependencies
	echo '"$(2)","$(3)","$(4)","$(5)","$(6)","$(7)","$(8)"' >>$(LEGAL_MANIFEST_CSV_$(1))
	endef

	define legal-license-file # pkgname, pkgname-pkgver, pkg-hashfile, filename, file-fullpath, {HOST\|TARGET}
	mkdir -p $(LICENSE_FILES_DIR_$(6))/$(2)/$(dir $(4)) && \
	{ \
	support/download/check-hash $(3) $(5) $(4); \
	case $${?} in (0\|3) ;; (*) exit 1;; esac; \
	} && \
	cp $(5) $(LICENSE_FILES_DIR_$(6))/$(2)/$(4)
	endef

	non-virtual-deps = $(foreach p,$(1),$(if $($(call UPPERCASE,$(p))_IS_VIRTUAL),,$(p)))

	# Returns the list of recursive dependencies and their licensing terms
	# for the package specified in parameter (in lowercase). If that
	# package is a target package, remove host packages from the list.
	legal-deps = \
	$(foreach p,\
	$(filter-out $(if $(1:host-%=),host-%),\
	$(call non-virtual-deps,\
	$($(call UPPERCASE,$(1))_FINAL_RECURSIVE_DEPENDENCIES))),$(p) [$($(call UPPERCASE,$(p))_LICENSE)])