support/scripts/br2-external

   1 #!/bin/bash
   2 set -e
   3
   4 # The location of the br2-external tree, once validated.
   5 declare BR2_EXT
   6
   7 main() {
   8     local OPT OPTARG
   9     local br2_ext ofile
  10
  11     while getopts :ho: OPT; do
  12         case "${OPT}" in
  13         h)  help; exit 0;;
  14         o)  ofile="${OPTARG}";;
  15         :)  error "option '%s' expects a mandatory argument\n" "${OPTARG}";;
  16         \?) error "unknown option '%s'\n" "${OPTARG}";;
  17         esac
  18     done
  19     # Forget options; keep only positional args
  20     shift $((OPTIND-1))
  21
  22     if [ ${#} -ne 1 ]; then
  23         error "need exactly one br2-external tree to be specified\n"
  24     fi
  25     br2_ext="${1}"
  26
  27     if [ -z "${ofile}" ]; then
  28         error "no output file specified (-o)\n"
  29     fi
  30
  31     do_validate "${br2_ext}"
  32
  33     do_kconfig >"${ofile}"
  34 }
  35
  36 # Validates the br2-external tree passed as argument. Makes it cannonical
  37 # and store it in global variable BR2_EXT.
  38 do_validate() {
  39     local br2_ext="${1}"
  40
  41     if [ ! -d "${br2_ext}" ]; then
  42         error "'%s': no such file or directory\n" "${br2_ext}"
  43     fi
  44     if [ ! -r "${br2_ext}" -o ! -x "${br2_ext}" ]; then
  45         error "'%s': permission denied\n" "${br2_ext}"
  46     fi
  47
  48     BR2_EXT="$(cd "${br2_ext}"; pwd -P )"
  49 }
  50
  51 # Generate the kconfig snippet for the br2-external tree.
  52 do_kconfig() {
  53     printf '#\n# Automatically generated file; DO NOT EDIT.\n#\n'
  54     printf '\n'
  55     printf 'config BR2_EXTERNAL\n'
  56     printf '\tstring\n'
  57     printf '\tdefault "%s"\n' "${BR2_EXT}"
  58     printf '\n'
  59     printf 'menu "User-provided options"\n'
  60     printf '\tdepends on BR2_EXTERNAL != "support/dummy-external"\n'
  61     printf '\n'
  62     printf 'source "%s/Config.in"\n' "${BR2_EXT}"
  63     printf '\n'
  64     printf "endmenu # User-provided options\n"
  65 }
  66
  67 help() {
  68     cat <<-_EOF_
  69         Usage:
  70             ${my_name} -o FILE PATH
  71
  72         ${my_name} generates the kconfig snippet to include the configuration
  73         options specified in the br2-external tree passed as positional argument.
  74
  75         Options:
  76             -o FILE
  77                 FILE in which to generate the kconfig snippet.
  78
  79         Returns:
  80             0   If no error
  81             !0  If any error
  82         _EOF_
  83 }
  84
  85 error() { local fmt="${1}"; shift; printf "%s: ${fmt}" "${my_name}" "${@}" >&2; exit 1; }
  86
  87 my_name="${0##*/}"
  88 main "${@}"