support/scripts/br2-external - buildroot - Git at Google

 #!/usr/bin/env bash
 set -e

 # This script must be able to run with bash-3.1, so it can't use
 # associative arrays. Instead, it emulates them using 'eval'. It
 # can however use indexed arrays, supported since at least bash-3.0.

 # The names of the br2-external trees, once validated.
 declare -a BR2_EXT_NAMES

 # URL to manual for help in converting old br2-external trees.
 # Escape '#' so that make does not consider it a comment.
 MANUAL_URL='https://buildroot.org/manual.html\#br2-external-converting'

 main() {
     local OPT OPTARG
     local br2_ext ofile ofmt

     while getopts :hkmo: OPT; do
         case "${OPT}" in
         h)  help; exit 0;;
         o)  ofile="${OPTARG}";;
         k)  ofmt="kconfig";;
         m)  ofmt="mk";;
         :)  error "option '%s' expects a mandatory argument\n" "${OPTARG}";;
         \?) error "unknown option '%s'\n" "${OPTARG}";;
         esac
     done
     # Forget options; keep only positional args
     shift $((OPTIND-1))

     case "${ofmt}" in
     mk|kconfig)
         ;;
     *)  error "no output format specified (-m/-k)\n";;
     esac
     if [ -z "${ofile}" ]; then
         error "no output file specified (-o)\n"
     fi

     exec >"${ofile}"

     # Trap any unexpected error to generate a meaningful error message
     trap "error 'unexpected error while generating ${ofile}\n'" ERR

     do_validate ${@//:/ }

     do_${ofmt}
 }

 # Validates the br2-external trees passed as arguments. Makes each of
 # them canonical and store them in the global arrays BR2_EXT_NAMES
 # and BR2_EXT_PATHS.
 #
 # Note: since this script is always first called from Makefile context
 # to generate the Makefile fragment before it is called to generate the
 # Kconfig snippet, we're sure that any error in do_validate will be
 # interpreted in Makefile context. Going up to generating the Kconfig
 # snippet means that there were no error.
 #
 do_validate() {
     local br2_ext

     if [ ${#} -eq 0 ]; then
         # No br2-external tree is valid
         return
     fi

     for br2_ext in "${@}"; do
         do_validate_one "${br2_ext}"
     done
 }

 do_validate_one() {
     local br2_ext="${1}"
     local br2_name br2_desc n d

     if [ ! -d "${br2_ext}" ]; then
         error "'%s': no such file or directory\n" "${br2_ext}"
     fi
     if [ ! -r "${br2_ext}" -o ! -x "${br2_ext}" ]; then
         error "'%s': permission denied\n" "${br2_ext}"
     fi
     if [ ! -f "${br2_ext}/external.desc" ]; then
         error "'%s': does not have a name (in 'external.desc'). See %s\n" \
             "${br2_ext}" "${MANUAL_URL}"
     fi
     br2_name="$(sed -r -e '/^name: +(.*)$/!d; s//\1/' "${br2_ext}/external.desc")"
     if [ -z "${br2_name}" ]; then
         error "'%s/external.desc': does not define the name\n" "${br2_ext}"
     fi
     # Only ASCII chars in [A-Za-z0-9_] are permitted
     n="$(sed -r -e 's/[A-Za-z0-9_]//g' <<<"${br2_name}" )"
     if [ -n "${n}" ]; then
         # Escape '$' so that it gets printed
         error "'%s': name '%s' contains invalid chars: '%s'\n" \
             "${br2_ext}" "${br2_name//\$/\$\$}" "${n//\$/\$\$}"
     fi
     eval d="\"\${BR2_EXT_PATHS_${br2_name}}\""
     if [ -n "${d}" ]; then
         error "'%s': name '%s' is already used in '%s'\n" \
             "${br2_ext}" "${br2_name}" "${d}"
     fi
     br2_desc="$(sed -r -e '/^desc: +(.*)$/!d; s//\1/' "${br2_ext}/external.desc")"
     if [ ! -f "${br2_ext}/external.mk" ]; then
         error "'%s/external.mk': no such file or directory\n" "${br2_ext}"
     fi
     if [ ! -f "${br2_ext}/Config.in" ]; then
         error "'%s/Config.in': no such file or directory\n" "${br2_ext}"
     fi

     # Register this br2-external tree, use an absolute canonical path
     br2_ext="$( cd "${br2_ext}"; pwd )"
     BR2_EXT_NAMES+=( "${br2_name}" )
     eval BR2_EXT_PATHS_${br2_name}="\"\${br2_ext}\""
     eval BR2_EXT_DESCS_${br2_name}="\"\${br2_desc:-\${br2_name}}\""
 }

 # Generate the .mk snippet that defines makefile variables
 # for the br2-external tree
 do_mk() {
     local br2_name br2_ext

     printf '#\n# Automatically generated file; DO NOT EDIT.\n#\n'
     printf '\n'

     printf 'BR2_EXTERNAL ?='
     for br2_name in "${BR2_EXT_NAMES[@]}"; do
         eval br2_ext="\"\${BR2_EXT_PATHS_${br2_name}}\""
         printf ' %s' "${br2_ext}"
     done
     printf '\n'

     printf 'BR2_EXTERNAL_NAMES = \n'
     printf 'BR2_EXTERNAL_DIRS = \n'
     printf 'BR2_EXTERNAL_MKS = \n'

     if [ ${#BR2_EXT_NAMES[@]} -eq 0 ]; then
         printf '\n'
         printf '# No br2-external tree defined.\n'
         return
     fi

     for br2_name in "${BR2_EXT_NAMES[@]}"; do
         eval br2_desc="\"\${BR2_EXT_DESCS_${br2_name}}\""
         eval br2_ext="\"\${BR2_EXT_PATHS_${br2_name}}\""
         printf '\n'
         printf 'BR2_EXTERNAL_NAMES += %s\n' "${br2_name}"
         printf 'BR2_EXTERNAL_DIRS += %s\n' "${br2_ext}"
         printf 'BR2_EXTERNAL_MKS += %s/external.mk\n' "${br2_ext}"
         printf 'export BR2_EXTERNAL_%s_PATH = %s\n' "${br2_name}" "${br2_ext}"
         printf 'export BR2_EXTERNAL_%s_DESC = %s\n' "${br2_name}" "${br2_desc}"
     done
 }

 # Generate the kconfig snippet for the br2-external tree.
 do_kconfig() {
     local br2_name br2_ext

     printf '#\n# Automatically generated file; DO NOT EDIT.\n#\n'
     printf '\n'

     if [ ${#BR2_EXT_NAMES[@]} -eq 0 ]; then
         printf '# No br2-external tree defined.\n'
         return
     fi

     printf 'menu "External options"\n'
     printf '\n'

     for br2_name in "${BR2_EXT_NAMES[@]}"; do
         eval br2_desc="\"\${BR2_EXT_DESCS_${br2_name}}\""
         eval br2_ext="\"\${BR2_EXT_PATHS_${br2_name}}\""
         if [ ${#BR2_EXT_NAMES[@]} -gt 1 ]; then
             printf 'menu "%s"\n' "${br2_desc}"
         fi
         printf 'comment "%s (in %s)"\n' "${br2_desc}" "${br2_ext}"
         printf 'config BR2_EXTERNAL_%s_PATH\n' "${br2_name}"
         printf '\tstring\n'
         printf '\tdefault "%s"\n' "${br2_ext}"
         printf 'source "%s/Config.in"\n' "${br2_ext}"
         if [ ${#BR2_EXT_NAMES[@]} -gt 1 ]; then
             printf 'endmenu # %s\n' "${br2_name}"
         fi
         printf '\n'
     done

     printf "endmenu # User-provided options\n"
 }

 help() {
     cat <<-_EOF_
 	Usage:
 	    ${my_name} <-m|-k> -o FILE PATH

 	With -m, ${my_name} generates the makefile fragment that defines
 	variables related to the br2-external trees passed as positional
 	arguments.

 	With -k, ${my_name} generates the kconfig snippet to include the
 	configuration options specified in the br2-external trees passed
 	as positional arguments.

 	Using -k and -m together is not possible. The last one wins.

 	Options:
 	    -m  Generate the makefile fragment.

 	    -k  Generate the kconfig snippet.

 	    -o FILE
 	        FILE in which to generate the kconfig snippet or makefile
 	        fragment.

 	Returns:
 	    0   If no error
 	    !0  If any error
 	_EOF_
 }

 error() { local fmt="${1}"; shift; printf "BR2_EXTERNAL_ERROR = ${fmt}" "${@}"; exit 1; }

 my_name="${0##*/}"
 main "${@}"
	#!/usr/bin/env bash
	set -e

	# This script must be able to run with bash-3.1, so it can't use
	# associative arrays. Instead, it emulates them using 'eval'. It
	# can however use indexed arrays, supported since at least bash-3.0.

	# The names of the br2-external trees, once validated.
	declare -a BR2_EXT_NAMES

	# URL to manual for help in converting old br2-external trees.
	# Escape '#' so that make does not consider it a comment.
	MANUAL_URL='https://buildroot.org/manual.html\#br2-external-converting'

	main() {
	local OPT OPTARG
	local br2_ext ofile ofmt

	while getopts :hkmo: OPT; do
	case "${OPT}" in
	h) help; exit 0;;
	o) ofile="${OPTARG}";;
	k) ofmt="kconfig";;
	m) ofmt="mk";;
	:) error "option '%s' expects a mandatory argument\n" "${OPTARG}";;
	\?) error "unknown option '%s'\n" "${OPTARG}";;
	esac
	done
	# Forget options; keep only positional args
	shift $((OPTIND-1))

	case "${ofmt}" in
	mk\|kconfig)
	;;
	*) error "no output format specified (-m/-k)\n";;
	esac
	if [ -z "${ofile}" ]; then
	error "no output file specified (-o)\n"
	fi

	exec >"${ofile}"

	# Trap any unexpected error to generate a meaningful error message
	trap "error 'unexpected error while generating ${ofile}\n'" ERR

	do_validate ${@//:/ }

	do_${ofmt}
	}

	# Validates the br2-external trees passed as arguments. Makes each of
	# them canonical and store them in the global arrays BR2_EXT_NAMES
	# and BR2_EXT_PATHS.
	#
	# Note: since this script is always first called from Makefile context
	# to generate the Makefile fragment before it is called to generate the
	# Kconfig snippet, we're sure that any error in do_validate will be
	# interpreted in Makefile context. Going up to generating the Kconfig
	# snippet means that there were no error.
	#
	do_validate() {
	local br2_ext

	if [ ${#} -eq 0 ]; then
	# No br2-external tree is valid
	return
	fi

	for br2_ext in "${@}"; do
	do_validate_one "${br2_ext}"
	done
	}

	do_validate_one() {
	local br2_ext="${1}"
	local br2_name br2_desc n d

	if [ ! -d "${br2_ext}" ]; then
	error "'%s': no such file or directory\n" "${br2_ext}"
	fi
	if [ ! -r "${br2_ext}" -o ! -x "${br2_ext}" ]; then
	error "'%s': permission denied\n" "${br2_ext}"
	fi
	if [ ! -f "${br2_ext}/external.desc" ]; then
	error "'%s': does not have a name (in 'external.desc'). See %s\n" \
	"${br2_ext}" "${MANUAL_URL}"
	fi
	br2_name="$(sed -r -e '/^name: +(.*)$/!d; s//\1/' "${br2_ext}/external.desc")"
	if [ -z "${br2_name}" ]; then
	error "'%s/external.desc': does not define the name\n" "${br2_ext}"
	fi
	# Only ASCII chars in [A-Za-z0-9_] are permitted
	n="$(sed -r -e 's/[A-Za-z0-9_]//g' <<<"${br2_name}" )"
	if [ -n "${n}" ]; then
	# Escape '$' so that it gets printed
	error "'%s': name '%s' contains invalid chars: '%s'\n" \
	"${br2_ext}" "${br2_name//\$/\$\$}" "${n//\$/\$\$}"
	fi
	eval d="\"\${BR2_EXT_PATHS_${br2_name}}\""
	if [ -n "${d}" ]; then
	error "'%s': name '%s' is already used in '%s'\n" \
	"${br2_ext}" "${br2_name}" "${d}"
	fi
	br2_desc="$(sed -r -e '/^desc: +(.*)$/!d; s//\1/' "${br2_ext}/external.desc")"
	if [ ! -f "${br2_ext}/external.mk" ]; then
	error "'%s/external.mk': no such file or directory\n" "${br2_ext}"
	fi
	if [ ! -f "${br2_ext}/Config.in" ]; then
	error "'%s/Config.in': no such file or directory\n" "${br2_ext}"
	fi

	# Register this br2-external tree, use an absolute canonical path
	br2_ext="$( cd "${br2_ext}"; pwd )"
	BR2_EXT_NAMES+=( "${br2_name}" )
	eval BR2_EXT_PATHS_${br2_name}="\"\${br2_ext}\""
	eval BR2_EXT_DESCS_${br2_name}="\"\${br2_desc:-\${br2_name}}\""
	}

	# Generate the .mk snippet that defines makefile variables
	# for the br2-external tree
	do_mk() {
	local br2_name br2_ext

	printf '#\n# Automatically generated file; DO NOT EDIT.\n#\n'
	printf '\n'

	printf 'BR2_EXTERNAL ?='
	for br2_name in "${BR2_EXT_NAMES[@]}"; do
	eval br2_ext="\"\${BR2_EXT_PATHS_${br2_name}}\""
	printf ' %s' "${br2_ext}"
	done
	printf '\n'

	printf 'BR2_EXTERNAL_NAMES = \n'
	printf 'BR2_EXTERNAL_DIRS = \n'
	printf 'BR2_EXTERNAL_MKS = \n'

	if [ ${#BR2_EXT_NAMES[@]} -eq 0 ]; then
	printf '\n'
	printf '# No br2-external tree defined.\n'
	return
	fi

	for br2_name in "${BR2_EXT_NAMES[@]}"; do
	eval br2_desc="\"\${BR2_EXT_DESCS_${br2_name}}\""
	eval br2_ext="\"\${BR2_EXT_PATHS_${br2_name}}\""
	printf '\n'
	printf 'BR2_EXTERNAL_NAMES += %s\n' "${br2_name}"
	printf 'BR2_EXTERNAL_DIRS += %s\n' "${br2_ext}"
	printf 'BR2_EXTERNAL_MKS += %s/external.mk\n' "${br2_ext}"
	printf 'export BR2_EXTERNAL_%s_PATH = %s\n' "${br2_name}" "${br2_ext}"
	printf 'export BR2_EXTERNAL_%s_DESC = %s\n' "${br2_name}" "${br2_desc}"
	done
	}

	# Generate the kconfig snippet for the br2-external tree.
	do_kconfig() {
	local br2_name br2_ext

	printf '#\n# Automatically generated file; DO NOT EDIT.\n#\n'
	printf '\n'

	if [ ${#BR2_EXT_NAMES[@]} -eq 0 ]; then
	printf '# No br2-external tree defined.\n'
	return
	fi

	printf 'menu "External options"\n'
	printf '\n'

	for br2_name in "${BR2_EXT_NAMES[@]}"; do
	eval br2_desc="\"\${BR2_EXT_DESCS_${br2_name}}\""
	eval br2_ext="\"\${BR2_EXT_PATHS_${br2_name}}\""
	if [ ${#BR2_EXT_NAMES[@]} -gt 1 ]; then
	printf 'menu "%s"\n' "${br2_desc}"
	fi
	printf 'comment "%s (in %s)"\n' "${br2_desc}" "${br2_ext}"
	printf 'config BR2_EXTERNAL_%s_PATH\n' "${br2_name}"
	printf '\tstring\n'
	printf '\tdefault "%s"\n' "${br2_ext}"
	printf 'source "%s/Config.in"\n' "${br2_ext}"
	if [ ${#BR2_EXT_NAMES[@]} -gt 1 ]; then
	printf 'endmenu # %s\n' "${br2_name}"
	fi
	printf '\n'
	done

	printf "endmenu # User-provided options\n"
	}

	help() {
	cat <<-_EOF_
	Usage:
	${my_name} <-m\|-k> -o FILE PATH

	With -m, ${my_name} generates the makefile fragment that defines
	variables related to the br2-external trees passed as positional
	arguments.

	With -k, ${my_name} generates the kconfig snippet to include the
	configuration options specified in the br2-external trees passed
	as positional arguments.

	Using -k and -m together is not possible. The last one wins.

	Options:
	-m Generate the makefile fragment.

	-k Generate the kconfig snippet.

	-o FILE
	FILE in which to generate the kconfig snippet or makefile
	fragment.

	Returns:
	0 If no error
	!0 If any error
	_EOF_
	}

	error() { local fmt="${1}"; shift; printf "BR2_EXTERNAL_ERROR = ${fmt}" "${@}"; exit 1; }

	my_name="${0##*/}"
	main "${@}"