linux/scripts/config
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   1#!/bin/bash
   2# Manipulate options in a .config file from the command line
   3
   4myname=${0##*/}
   5
   6# If no prefix forced, use the default CONFIG_
   7CONFIG_="${CONFIG_-CONFIG_}"
   8
   9usage() {
  10        cat >&2 <<EOL
  11Manipulate options in a .config file from the command line.
  12Usage:
  13$myname options command ...
  14commands:
  15        --enable|-e option   Enable option
  16        --disable|-d option  Disable option
  17        --module|-m option   Turn option into a module
  18        --set-str option string
  19                             Set option to "string"
  20        --set-val option value
  21                             Set option to value
  22        --undefine|-u option Undefine option
  23        --state|-s option    Print state of option (n,y,m,undef)
  24
  25        --enable-after|-E beforeopt option
  26                             Enable option directly after other option
  27        --disable-after|-D beforeopt option
  28                             Disable option directly after other option
  29        --module-after|-M beforeopt option
  30                             Turn option into module directly after other option
  31
  32        commands can be repeated multiple times
  33
  34options:
  35        --file config-file   .config file to change (default .config)
  36        --keep-case|-k       Keep next symbols' case (dont' upper-case it)
  37
  38$myname doesn't check the validity of the .config file. This is done at next
  39make time.
  40
  41By default, $myname will upper-case the given symbol. Use --keep-case to keep
  42the case of all following symbols unchanged.
  43
  44$myname uses 'CONFIG_' as the default symbol prefix. Set the environment
  45variable CONFIG_ to the prefix to use. Eg.: CONFIG_="FOO_" $myname ...
  46EOL
  47        exit 1
  48}
  49
  50checkarg() {
  51        ARG="$1"
  52        if [ "$ARG" = "" ] ; then
  53                usage
  54        fi
  55        case "$ARG" in
  56        ${CONFIG_}*)
  57                ARG="${ARG/${CONFIG_}/}"
  58                ;;
  59        esac
  60        if [ "$MUNGE_CASE" = "yes" ] ; then
  61                ARG="`echo $ARG | tr a-z A-Z`"
  62        fi
  63}
  64
  65set_var() {
  66        local name=$1 new=$2 before=$3
  67
  68        name_re="^($name=|# $name is not set)"
  69        before_re="^($before=|# $before is not set)"
  70        if test -n "$before" && grep -Eq "$before_re" "$FN"; then
  71                sed -ri "/$before_re/a $new" "$FN"
  72        elif grep -Eq "$name_re" "$FN"; then
  73                sed -ri "s:$name_re.*:$new:" "$FN"
  74        else
  75                echo "$new" >>"$FN"
  76        fi
  77}
  78
  79undef_var() {
  80        local name=$1
  81
  82        sed -ri "/^($name=|# $name is not set)/d" "$FN"
  83}
  84
  85if [ "$1" = "--file" ]; then
  86        FN="$2"
  87        if [ "$FN" = "" ] ; then
  88                usage
  89        fi
  90        shift 2
  91else
  92        FN=.config
  93fi
  94
  95if [ "$1" = "" ] ; then
  96        usage
  97fi
  98
  99MUNGE_CASE=yes
 100while [ "$1" != "" ] ; do
 101        CMD="$1"
 102        shift
 103        case "$CMD" in
 104        --keep-case|-k)
 105                MUNGE_CASE=no
 106                continue
 107                ;;
 108        --refresh)
 109                ;;
 110        --*-after|-E|-D|-M)
 111                checkarg "$1"
 112                A=$ARG
 113                checkarg "$2"
 114                B=$ARG
 115                shift 2
 116                ;;
 117        -*)
 118                checkarg "$1"
 119                shift
 120                ;;
 121        esac
 122        case "$CMD" in
 123        --enable|-e)
 124                set_var "${CONFIG_}$ARG" "${CONFIG_}$ARG=y"
 125                ;;
 126
 127        --disable|-d)
 128                set_var "${CONFIG_}$ARG" "# ${CONFIG_}$ARG is not set"
 129                ;;
 130
 131        --module|-m)
 132                set_var "${CONFIG_}$ARG" "${CONFIG_}$ARG=m"
 133                ;;
 134
 135        --set-str)
 136                # sed swallows one level of escaping, so we need double-escaping
 137                set_var "${CONFIG_}$ARG" "${CONFIG_}$ARG=\"${1//\"/\\\\\"}\""
 138                shift
 139                ;;
 140
 141        --set-val)
 142                set_var "${CONFIG_}$ARG" "${CONFIG_}$ARG=$1"
 143                shift
 144                ;;
 145        --undefine|-u)
 146                undef_var "${CONFIG_}$ARG"
 147                ;;
 148
 149        --state|-s)
 150                if grep -q "# ${CONFIG_}$ARG is not set" $FN ; then
 151                        echo n
 152                else
 153                        V="$(grep "^${CONFIG_}$ARG=" $FN)"
 154                        if [ $? != 0 ] ; then
 155                                echo undef
 156                        else
 157                                V="${V/#${CONFIG_}$ARG=/}"
 158                                V="${V/#\"/}"
 159                                V="${V/%\"/}"
 160                                V="${V//\\\"/\"}"
 161                                echo "${V}"
 162                        fi
 163                fi
 164                ;;
 165
 166        --enable-after|-E)
 167                set_var "${CONFIG_}$B" "${CONFIG_}$B=y" "${CONFIG_}$A"
 168                ;;
 169
 170        --disable-after|-D)
 171                set_var "${CONFIG_}$B" "# ${CONFIG_}$B is not set" "${CONFIG_}$A"
 172                ;;
 173
 174        --module-after|-M)
 175                set_var "${CONFIG_}$B" "${CONFIG_}$B=m" "${CONFIG_}$A"
 176                ;;
 177
 178        # undocumented because it ignores --file (fixme)
 179        --refresh)
 180                yes "" | make oldconfig
 181                ;;
 182
 183        *)
 184                usage
 185                ;;
 186        esac
 187done
 188
 189
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