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
  65txt_append() {
  66        local anchor="$1"
  67        local insert="$2"
  68        local infile="$3"
  69        local tmpfile="$infile.swp"
  70
  71        # sed append cmd: 'a\' + newline + text + newline
  72        cmd="$(printf "a\\%b$insert" "\n")"
  73
  74        sed -e "/$anchor/$cmd" "$infile" >"$tmpfile"
  75        # replace original file with the edited one
  76        mv "$tmpfile" "$infile"
  77}
  78
  79txt_subst() {
  80        local before="$1"
  81        local after="$2"
  82        local infile="$3"
  83        local tmpfile="$infile.swp"
  84
  85        sed -e "s:$before:$after:" "$infile" >"$tmpfile"
  86        # replace original file with the edited one
  87        mv "$tmpfile" "$infile"
  88}
  89
  90txt_delete() {
  91        local text="$1"
  92        local infile="$2"
  93        local tmpfile="$infile.swp"
  94
  95        sed -e "/$text/d" "$infile" >"$tmpfile"
  96        # replace original file with the edited one
  97        mv "$tmpfile" "$infile"
  98}
  99
 100set_var() {
 101        local name=$1 new=$2 before=$3
 102
 103        name_re="^($name=|# $name is not set)"
 104        before_re="^($before=|# $before is not set)"
 105        if test -n "$before" && grep -Eq "$before_re" "$FN"; then
 106                txt_append "^$before=" "$new" "$FN"
 107                txt_append "^# $before is not set" "$new" "$FN"
 108        elif grep -Eq "$name_re" "$FN"; then
 109                txt_subst "^$name=.*" "$new" "$FN"
 110                txt_subst "^# $name is not set" "$new" "$FN"
 111        else
 112                echo "$new" >>"$FN"
 113        fi
 114}
 115
 116undef_var() {
 117        local name=$1
 118
 119        txt_delete "^$name=" "$FN"
 120        txt_delete "^# $name is not set" "$FN"
 121}
 122
 123if [ "$1" = "--file" ]; then
 124        FN="$2"
 125        if [ "$FN" = "" ] ; then
 126                usage
 127        fi
 128        shift 2
 129else
 130        FN=.config
 131fi
 132
 133if [ "$1" = "" ] ; then
 134        usage
 135fi
 136
 137MUNGE_CASE=yes
 138while [ "$1" != "" ] ; do
 139        CMD="$1"
 140        shift
 141        case "$CMD" in
 142        --keep-case|-k)
 143                MUNGE_CASE=no
 144                continue
 145                ;;
 146        --refresh)
 147                ;;
 148        --*-after|-E|-D|-M)
 149                checkarg "$1"
 150                A=$ARG
 151                checkarg "$2"
 152                B=$ARG
 153                shift 2
 154                ;;
 155        -*)
 156                checkarg "$1"
 157                shift
 158                ;;
 159        esac
 160        case "$CMD" in
 161        --enable|-e)
 162                set_var "${CONFIG_}$ARG" "${CONFIG_}$ARG=y"
 163                ;;
 164
 165        --disable|-d)
 166                set_var "${CONFIG_}$ARG" "# ${CONFIG_}$ARG is not set"
 167                ;;
 168
 169        --module|-m)
 170                set_var "${CONFIG_}$ARG" "${CONFIG_}$ARG=m"
 171                ;;
 172
 173        --set-str)
 174                # sed swallows one level of escaping, so we need double-escaping
 175                set_var "${CONFIG_}$ARG" "${CONFIG_}$ARG=\"${1//\"/\\\\\"}\""
 176                shift
 177                ;;
 178
 179        --set-val)
 180                set_var "${CONFIG_}$ARG" "${CONFIG_}$ARG=$1"
 181                shift
 182                ;;
 183        --undefine|-u)
 184                undef_var "${CONFIG_}$ARG"
 185                ;;
 186
 187        --state|-s)
 188                if grep -q "# ${CONFIG_}$ARG is not set" $FN ; then
 189                        echo n
 190                else
 191                        V="$(grep "^${CONFIG_}$ARG=" $FN)"
 192                        if [ $? != 0 ] ; then
 193                                echo undef
 194                        else
 195                                V="${V/#${CONFIG_}$ARG=/}"
 196                                V="${V/#\"/}"
 197                                V="${V/%\"/}"
 198                                V="${V//\\\"/\"}"
 199                                echo "${V}"
 200                        fi
 201                fi
 202                ;;
 203
 204        --enable-after|-E)
 205                set_var "${CONFIG_}$B" "${CONFIG_}$B=y" "${CONFIG_}$A"
 206                ;;
 207
 208        --disable-after|-D)
 209                set_var "${CONFIG_}$B" "# ${CONFIG_}$B is not set" "${CONFIG_}$A"
 210                ;;
 211
 212        --module-after|-M)
 213                set_var "${CONFIG_}$B" "${CONFIG_}$B=m" "${CONFIG_}$A"
 214                ;;
 215
 216        # undocumented because it ignores --file (fixme)
 217        --refresh)
 218                yes "" | make oldconfig
 219                ;;
 220
 221        *)
 222                usage
 223                ;;
 224        esac
 225done
 226
 227
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