#!/usr/bin/env bash
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set -e
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# This script must be able to run with bash-3.1, so it can't use
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# associative arrays. Instead, it emulates them using 'eval'. It
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# can however use indexed arrays, supported since at least bash-3.0.
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# The names of the br2-external trees, once validated.
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declare -a BR2_EXT_NAMES
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# URL to manual for help in converting old br2-external trees.
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# Escape '#' so that make does not consider it a comment.
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MANUAL_URL='https://buildroot.org/manual.html\#br2-external-converting'
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main() {
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local OPT OPTARG
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local br2_ext outputdir
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while getopts :d: OPT; do
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case "${OPT}" in
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d) outputdir="${OPTARG}";;
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:) error "option '%s' expects a mandatory argument\n" "${OPTARG}";;
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\?) error "unknown option '%s'\n" "${OPTARG}";;
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esac
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done
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# Forget options; keep only positional args
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shift $((OPTIND-1))
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if [ -z "${outputdir}" ]; then
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error "no output directory specified (-d)\n"
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fi
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# Trap any unexpected error to generate a meaningful error message
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trap "error 'unexpected error while generating ${ofile}\n'" ERR
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mkdir -p "${outputdir}"
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do_validate "${outputdir}" ${@//:/ }
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do_mk "${outputdir}"
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do_kconfig "${outputdir}"
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}
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# Validates the br2-external trees passed as arguments. Makes each of
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# them canonical and store them in the global arrays BR2_EXT_NAMES
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# and BR2_EXT_PATHS.
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#
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# Note: since this script is always first called from Makefile context
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# to generate the Makefile fragment before it is called to generate the
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# Kconfig snippet, we're sure that any error in do_validate will be
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# interpreted in Makefile context. Going up to generating the Kconfig
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# snippet means that there were no error.
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#
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do_validate() {
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local outputdir="${1}"
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local br2_ext
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shift
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if [ ${#} -eq 0 ]; then
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# No br2-external tree is valid
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return
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fi
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for br2_ext in "${@}"; do
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do_validate_one "${br2_ext}"
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done >"${outputdir}/.br2-external.mk"
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}
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do_validate_one() {
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local br2_ext="${1}"
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local br2_name br2_desc n d
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if [ ! -d "${br2_ext}" ]; then
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error "'%s': no such file or directory\n" "${br2_ext}"
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fi
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if [ ! -r "${br2_ext}" -o ! -x "${br2_ext}" ]; then
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error "'%s': permission denied\n" "${br2_ext}"
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fi
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if [ ! -f "${br2_ext}/external.desc" ]; then
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error "'%s': does not have an 'external.desc'. See %s\n" \
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"${br2_ext}" "${MANUAL_URL}"
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fi
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br2_name="$(sed -r -e '/^name: +(.*)$/!d; s//\1/' "${br2_ext}/external.desc")"
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if [ -z "${br2_name}" ]; then
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error "'%s/external.desc': does not define the name\n" "${br2_ext}"
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fi
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# Only ASCII chars in [A-Za-z0-9_] are permitted
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n="$(sed -r -e 's/[A-Za-z0-9_]//g' <<<"${br2_name}" )"
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if [ -n "${n}" ]; then
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# Escape '$' so that it gets printed
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error "'%s': name '%s' contains invalid chars: '%s'\n" \
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"${br2_ext}" "${br2_name//\$/\$\$}" "${n//\$/\$\$}"
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fi
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eval d="\"\${BR2_EXT_PATHS_${br2_name}}\""
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if [ -n "${d}" ]; then
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error "'%s': name '%s' is already used in '%s'\n" \
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"${br2_ext}" "${br2_name}" "${d}"
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fi
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br2_desc="$(sed -r -e '/^desc: +(.*)$/!d; s//\1/' "${br2_ext}/external.desc")"
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if [ ! -f "${br2_ext}/external.mk" ]; then
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error "'%s/external.mk': no such file or directory\n" "${br2_ext}"
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fi
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if [ ! -f "${br2_ext}/Config.in" ]; then
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error "'%s/Config.in': no such file or directory\n" "${br2_ext}"
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fi
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# Register this br2-external tree, use an absolute canonical path
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br2_ext="$( cd "${br2_ext}"; pwd )"
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BR2_EXT_NAMES+=( "${br2_name}" )
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eval BR2_EXT_PATHS_${br2_name}="\"\${br2_ext}\""
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eval BR2_EXT_DESCS_${br2_name}="\"\${br2_desc:-\${br2_name}}\""
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}
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# Generate the .mk snippet that defines makefile variables
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# for the br2-external tree
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do_mk() {
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local outputdir="${1}"
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local br2_name br2_desc br2_ext
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{
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printf '#\n# Automatically generated file; DO NOT EDIT.\n#\n'
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printf '\n'
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printf 'BR2_EXTERNAL ?='
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for br2_name in "${BR2_EXT_NAMES[@]}"; do
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eval br2_ext="\"\${BR2_EXT_PATHS_${br2_name}}\""
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printf ' %s' "${br2_ext}"
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done
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printf '\n'
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printf 'BR2_EXTERNAL_NAMES = \n'
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printf 'BR2_EXTERNAL_DIRS = \n'
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printf 'BR2_EXTERNAL_MKS = \n'
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if [ ${#BR2_EXT_NAMES[@]} -eq 0 ]; then
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printf '\n'
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printf '# No br2-external tree defined.\n'
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return
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fi
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for br2_name in "${BR2_EXT_NAMES[@]}"; do
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eval br2_desc="\"\${BR2_EXT_DESCS_${br2_name}}\""
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eval br2_ext="\"\${BR2_EXT_PATHS_${br2_name}}\""
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printf '\n'
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printf 'BR2_EXTERNAL_NAMES += %s\n' "${br2_name}"
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printf 'BR2_EXTERNAL_DIRS += %s\n' "${br2_ext}"
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printf 'BR2_EXTERNAL_MKS += %s/external.mk\n' "${br2_ext}"
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printf 'export BR2_EXTERNAL_%s_PATH = %s\n' "${br2_name}" "${br2_ext}"
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printf 'export BR2_EXTERNAL_%s_DESC = %s\n' "${br2_name}" "${br2_desc}"
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done
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} >"${outputdir}/.br2-external.mk"
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}
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# Generate the kconfig snippets for the br2-external tree.
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do_kconfig() {
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local outputdir="${1}"
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local br2_name br2_desc br2_ext br2
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local -a items
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items=(
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paths
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menus
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toolchains
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jpeg
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openssl
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skeleton
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init
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)
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for br2 in "${items[@]}"; do
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{
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printf '#\n# Automatically generated file; DO NOT EDIT.\n#\n'
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printf '\n'
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if [ ${#BR2_EXT_NAMES[@]} -eq 0 ]; then
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printf '# No br2-external tree defined.\n'
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fi
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} >"${outputdir}/.br2-external.in.${br2}"
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done
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if [ ${#BR2_EXT_NAMES[@]} -eq 0 ]; then
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return
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fi
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printf 'menu "External options"\n\n' >>"${outputdir}/.br2-external.in.menus"
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for br2_name in "${BR2_EXT_NAMES[@]}"; do
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eval br2_desc="\"\${BR2_EXT_DESCS_${br2_name}}\""
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eval br2_ext="\"\${BR2_EXT_PATHS_${br2_name}}\""
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{
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printf 'config BR2_EXTERNAL_%s_PATH\n' "${br2_name}"
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printf '\tstring\n'
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printf '\tdefault "%s"\n' "${br2_ext}"
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printf '\n'
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} >>"${outputdir}/.br2-external.in.paths"
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{
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if [ ${#BR2_EXT_NAMES[@]} -gt 1 ]; then
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printf 'menu "%s"\n' "${br2_desc}"
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fi
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printf 'comment "%s (in %s)"\n' "${br2_desc}" "${br2_ext}"
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printf 'source "%s/Config.in"\n' "${br2_ext}"
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if [ ${#BR2_EXT_NAMES[@]} -gt 1 ]; then
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printf 'endmenu # %s\n' "${br2_name}"
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fi
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printf '\n'
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} >>"${outputdir}/.br2-external.in.menus"
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if [ -f "${br2_ext}/provides/toolchains.in" ]; then
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printf 'comment "Toolchains from: %s"\n' "${br2_desc}"
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printf 'source "%s/provides/toolchains.in"\n' "${br2_ext}"
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printf '\n'
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else
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printf '# No toolchain from: %s\n\n' "${br2_desc}"
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fi >>"${outputdir}/.br2-external.in.toolchains"
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if [ -f "${br2_ext}/provides/jpeg.in" ]; then
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printf 'comment "jpeg from: %s"\n' "${br2_desc}"
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printf 'source "%s/provides/jpeg.in"\n' "${br2_ext}"
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printf '\n'
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else
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printf '# No jpeg from: %s\n\n' "${br2_desc}"
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fi >>"${outputdir}/.br2-external.in.jpeg"
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if [ -f "${br2_ext}/provides/openssl.in" ]; then
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printf 'comment "openssl from: %s"\n' "${br2_desc}"
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printf 'source "%s/provides/openssl.in"\n' "${br2_ext}"
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printf '\n'
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else
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printf '# No openssl from: %s\n\n' "${br2_desc}"
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fi >>"${outputdir}/.br2-external.in.openssl"
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if [ -f "${br2_ext}/provides/skeleton.in" ]; then
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printf 'comment "skeleton from: %s"\n' "${br2_desc}"
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printf 'source "%s/provides/skeleton.in"\n' "${br2_ext}"
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printf '\n'
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else
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printf '# No skeleton from: %s\n\n' "${br2_desc}"
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fi >>"${outputdir}/.br2-external.in.skeleton"
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if [ -f "${br2_ext}/provides/init.in" ]; then
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printf 'comment "init from: %s"\n' "${br2_desc}"
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printf 'source "%s/provides/init.in"\n' "${br2_ext}"
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printf '\n'
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else
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printf '# No init from: %s\n\n' "${br2_desc}"
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fi >>"${outputdir}/.br2-external.in.init"
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done
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printf 'endmenu\n' >>"${outputdir}/.br2-external.in.menus"
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}
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error() { local fmt="${1}"; shift; printf "BR2_EXTERNAL_ERROR = ${fmt}" "${@}"; exit 1; }
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my_name="${0##*/}"
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main "${@}"
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