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#!/bin/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}"
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="${0##*/}"
main "${@}"
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