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#!/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 outputdir
while getopts :d: OPT; do
case "${OPT}" in
d) outputdir="${OPTARG}";;
:) error "option '%s' expects a mandatory argument\n" "${OPTARG}";;
\?) error "unknown option '%s'\n" "${OPTARG}";;
esac
done
# Forget options; keep only positional args
shift $((OPTIND-1))
if [ -z "${outputdir}" ]; then
error "no output directory specified (-d)\n"
fi
# Trap any unexpected error to generate a meaningful error message
trap "error 'unexpected error while generating ${ofile}\n'" ERR
mkdir -p "${outputdir}"
do_validate "${outputdir}" ${@//:/ }
do_mk "${outputdir}"
do_kconfig "${outputdir}"
}
# Validates the br2-external trees passed as arguments. Makes each of
# them canonical and store them in the global arrays BR2_EXT_NAMES
# and BR2_EXT_PATHS.
#
# Note: since this script is always first called from Makefile context
# to generate the Makefile fragment before it is called to generate the
# Kconfig snippet, we're sure that any error in do_validate will be
# interpreted in Makefile context. Going up to generating the Kconfig
# snippet means that there were no error.
#
do_validate() {
local outputdir="${1}"
local br2_ext
shift
if [ ${#} -eq 0 ]; then
# No br2-external tree is valid
return
fi
for br2_ext in "${@}"; do
do_validate_one "${br2_ext}"
done >"${outputdir}/.br2-external.mk"
}
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 "${br2_ext}/external.desc" ]; then
error "'%s': does not have an 'external.desc'. See %s\n" \
"${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 outputdir="${1}"
local br2_name br2_desc br2_ext
{
printf '#\n# Automatically generated file; DO NOT EDIT.\n#\n'
printf '\n'
printf 'BR2_EXTERNAL ?='
for br2_name in "${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}" "${br2_desc}"
done
} >"${outputdir}/.br2-external.mk"
}
# Generate the kconfig snippets for the br2-external tree.
do_kconfig() {
local outputdir="${1}"
local br2_name br2_desc br2_ext br2
local -a items
items=(
paths
menus
toolchains
jpeg
openssl
skeleton
init
)
for br2 in "${items[@]}"; do
{
printf '#\n# Automatically generated file; DO NOT EDIT.\n#\n'
printf '\n'
if [ ${#BR2_EXT_NAMES[@]} -eq 0 ]; then
printf '# No br2-external tree defined.\n'
fi
} >"${outputdir}/.br2-external.in.${br2}"
done
if [ ${#BR2_EXT_NAMES[@]} -eq 0 ]; then
return
fi
printf 'menu "External options"\n\n' >>"${outputdir}/.br2-external.in.menus"
for br2_name in "${BR2_EXT_NAMES[@]}"; do
eval br2_desc="\"\${BR2_EXT_DESCS_${br2_name}}\""
eval br2_ext="\"\${BR2_EXT_PATHS_${br2_name}}\""
{
printf 'config BR2_EXTERNAL_%s_PATH\n' "${br2_name}"
printf '\tstring\n'
printf '\tdefault "%s"\n' "${br2_ext}"
printf '\n'
} >>"${outputdir}/.br2-external.in.paths"
{
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 'source "%s/Config.in"\n' "${br2_ext}"
if [ ${#BR2_EXT_NAMES[@]} -gt 1 ]; then
printf 'endmenu # %s\n' "${br2_name}"
fi
printf '\n'
} >>"${outputdir}/.br2-external.in.menus"
if [ -f "${br2_ext}/provides/toolchains.in" ]; then
printf 'comment "Toolchains from: %s"\n' "${br2_desc}"
printf 'source "%s/provides/toolchains.in"\n' "${br2_ext}"
printf '\n'
else
printf '# No toolchain from: %s\n\n' "${br2_desc}"
fi >>"${outputdir}/.br2-external.in.toolchains"
if [ -f "${br2_ext}/provides/jpeg.in" ]; then
printf 'comment "jpeg from: %s"\n' "${br2_desc}"
printf 'source "%s/provides/jpeg.in"\n' "${br2_ext}"
printf '\n'
else
printf '# No jpeg from: %s\n\n' "${br2_desc}"
fi >>"${outputdir}/.br2-external.in.jpeg"
if [ -f "${br2_ext}/provides/openssl.in" ]; then
printf 'comment "openssl from: %s"\n' "${br2_desc}"
printf 'source "%s/provides/openssl.in"\n' "${br2_ext}"
printf '\n'
else
printf '# No openssl from: %s\n\n' "${br2_desc}"
fi >>"${outputdir}/.br2-external.in.openssl"
if [ -f "${br2_ext}/provides/skeleton.in" ]; then
printf 'comment "skeleton from: %s"\n' "${br2_desc}"
printf 'source "%s/provides/skeleton.in"\n' "${br2_ext}"
printf '\n'
else
printf '# No skeleton from: %s\n\n' "${br2_desc}"
fi >>"${outputdir}/.br2-external.in.skeleton"
if [ -f "${br2_ext}/provides/init.in" ]; then
printf 'comment "init from: %s"\n' "${br2_desc}"
printf 'source "%s/provides/init.in"\n' "${br2_ext}"
printf '\n'
else
printf '# No init from: %s\n\n' "${br2_desc}"
fi >>"${outputdir}/.br2-external.in.init"
done
printf 'endmenu\n' >>"${outputdir}/.br2-external.in.menus"
}
error() { local fmt="${1}"; shift; printf "BR2_EXTERNAL_ERROR = ${fmt}" "${@}"; exit 1; }
my_name="${0##*/}"
main "${@}"
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