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#!/bin/bash
set -e
# The location of the br2-external tree, once validated.
declare BR2_EXT
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))
# Accept 0 or 1 br2-external tree.
if [ ${#} -gt 1 ]; then
error "only zero or one br2-external tree allowed.\n"
fi
br2_ext="${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 >"${ofile}"
do_validate "${br2_ext}"
do_${ofmt}
}
# Validates the br2-external tree passed as argument. Makes it cannonical
# and store it in global variable BR2_EXT.
#
# Note: since this script is always first called from Makefile context
# to generate the Makefile fragment before it is called to generate the
# Kconfig snippet, we're sure that any error in do_validate will be
# interpreted in Makefile context. Going up to generating the Kconfig
# snippet means that there were no error.
#
do_validate() {
local br2_ext="${1}"
# No br2-external tree is valid
if [ -z "${br2_ext}" ]; then
return
fi
if [ ! -d "${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
BR2_EXT="$(cd "${br2_ext}"; pwd -P )"
}
# Generate the .mk snippet that defines makefile variables
# for the br2-external tree
do_mk() {
local BR2_EXT="${1}"
printf '#\n# Automatically generated file; DO NOT EDIT.\n#\n'
printf '\n'
printf 'BR2_EXTERNAL ?= %s\n' "${BR2_EXT}"
printf 'BR2_EXTERNAL_MK =\n'
printf '\n'
if [ -z "${BR2_EXT}" ]; then
printf '# No br2-external tree defined.\n'
return
fi
printf 'BR2_EXTERNAL_MK = %s/external.mk\n' "${BR2_EXT}"
}
# Generate the kconfig snippet for the br2-external tree.
do_kconfig() {
printf '#\n# Automatically generated file; DO NOT EDIT.\n#\n'
printf '\n'
if [ -z "${BR2_EXT}" ]; then
printf '# No br2-external tree defined.\n'
return
fi
printf 'config BR2_EXTERNAL\n'
printf '\tstring\n'
printf '\tdefault "%s"\n' "${BR2_EXT}"
printf '\n'
printf 'menu "User-provided options"\n'
printf '\n'
printf 'source "%s/Config.in"\n' "${BR2_EXT}"
printf '\n'
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 tree passed as positional
argument.
With -k, ${my_name} generates the kconfig snippet to include the
configuration options specified in the br2-external tree passed
as positional argument.
Using -k and -m together is not possible. The last one wins.
Options:
-m Generate the makefile fragment.
-k Generate the kconfig snippet.
-o FILE
FILE in which to generate the kconfig snippet or makefile
fragment.
Returns:
0 If no error
!0 If any error
_EOF_
}
error() { local fmt="${1}"; shift; printf "BR2_EXTERNAL_ERROR = ${fmt}" "${@}"; exit 1; }
my_name="${0##*/}"
main "${@}"
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