scripts/config

   1 #!/bin/bash
   2 # SPDX-License-Identifier: GPL-2.0
   3 # Manipulate options in a .config file from the command line
   4
   5 myname=${0##*/}
   6
   7 # If no prefix forced, use the default CONFIG_
   8 CONFIG_="${CONFIG_-CONFIG_}"
   9
  10 usage() {
  11         cat >&2 <<EOL
  12 Manipulate options in a .config file from the command line.
  13 Usage:
  14 $myname options command ...
  15 commands:
  16         --enable|-e option   Enable option
  17         --disable|-d option  Disable option
  18         --module|-m option   Turn option into a module
  19         --set-str option string
  20                              Set option to "string"
  21         --set-val option value
  22                              Set option to value
  23         --undefine|-u option Undefine option
  24         --state|-s option    Print state of option (n,y,m,undef)
  25
  26         --enable-after|-E beforeopt option
  27                              Enable option directly after other option
  28         --disable-after|-D beforeopt option
  29                              Disable option directly after other option
  30         --module-after|-M beforeopt option
  31                              Turn option into module directly after other option
  32
  33         commands can be repeated multiple times
  34
  35 options:
  36         --file config-file   .config file to change (default .config)
  37         --keep-case|-k       Keep next symbols' case (dont' upper-case it)
  38
  39 $myname doesn't check the validity of the .config file. This is done at next
  40 make time.
  41
  42 By default, $myname will upper-case the given symbol. Use --keep-case to keep
  43 the case of all following symbols unchanged.
  44
  45 $myname uses 'CONFIG_' as the default symbol prefix. Set the environment
  46 variable CONFIG_ to the prefix to use. Eg.: CONFIG_="FOO_" $myname ...
  47 EOL
  48         exit 1
  49 }
  50
  51 checkarg() {
  52         ARG="$1"
  53         if [ "$ARG" = "" ] ; then
  54                 usage
  55         fi
  56         case "$ARG" in
  57         ${CONFIG_}*)
  58                 ARG="${ARG/${CONFIG_}/}"
  59                 ;;
  60         esac
  61         if [ "$MUNGE_CASE" = "yes" ] ; then
  62                 ARG="`echo $ARG | tr a-z A-Z`"
  63         fi
  64 }
  65
  66 txt_append() {
  67         local anchor="$1"
  68         local insert="$2"
  69         local infile="$3"
  70         local tmpfile="$infile.swp"
  71
  72         # sed append cmd: 'a\' + newline + text + newline
  73         cmd="$(printf "a\\%b$insert" "\n")"
  74
  75         sed -e "/$anchor/$cmd" "$infile" >"$tmpfile"
  76         # replace original file with the edited one
  77         mv "$tmpfile" "$infile"
  78 }
  79
  80 txt_subst() {
  81         local before="$1"
  82         local after="$2"
  83         local infile="$3"
  84         local tmpfile="$infile.swp"
  85
  86         sed -e "s:$before:$after:" "$infile" >"$tmpfile"
  87         # replace original file with the edited one
  88         mv "$tmpfile" "$infile"
  89 }
  90
  91 txt_delete() {
  92         local text="$1"
  93         local infile="$2"
  94         local tmpfile="$infile.swp"
  95
  96         sed -e "/$text/d" "$infile" >"$tmpfile"
  97         # replace original file with the edited one
  98         mv "$tmpfile" "$infile"
  99 }
 100
 101 set_var() {
 102         local name=$1 new=$2 before=$3
 103
 104         name_re="^($name=|# $name is not set)"
 105         before_re="^($before=|# $before is not set)"
 106         if test -n "$before" && grep -Eq "$before_re" "$FN"; then
 107                 txt_append "^$before=" "$new" "$FN"
 108                 txt_append "^# $before is not set" "$new" "$FN"
 109         elif grep -Eq "$name_re" "$FN"; then
 110                 txt_subst "^$name=.*" "$new" "$FN"
 111                 txt_subst "^# $name is not set" "$new" "$FN"
 112         else
 113                 echo "$new" >>"$FN"
 114         fi
 115 }
 116
 117 undef_var() {
 118         local name=$1
 119
 120         txt_delete "^$name=" "$FN"
 121         txt_delete "^# $name is not set" "$FN"
 122 }
 123
 124 if [ "$1" = "--file" ]; then
 125         FN="$2"
 126         if [ "$FN" = "" ] ; then
 127                 usage
 128         fi
 129         shift 2
 130 else
 131         FN=.config
 132 fi
 133
 134 if [ "$1" = "" ] ; then
 135         usage
 136 fi
 137
 138 MUNGE_CASE=yes
 139 while [ "$1" != "" ] ; do
 140         CMD="$1"
 141         shift
 142         case "$CMD" in
 143         --keep-case|-k)
 144                 MUNGE_CASE=no
 145                 continue
 146                 ;;
 147         --refresh)
 148                 ;;
 149         --*-after|-E|-D|-M)
 150                 checkarg "$1"
 151                 A=$ARG
 152                 checkarg "$2"
 153                 B=$ARG
 154                 shift 2
 155                 ;;
 156         -*)
 157                 checkarg "$1"
 158                 shift
 159                 ;;
 160         esac
 161         case "$CMD" in
 162         --enable|-e)
 163                 set_var "${CONFIG_}$ARG" "${CONFIG_}$ARG=y"
 164                 ;;
 165
 166         --disable|-d)
 167                 set_var "${CONFIG_}$ARG" "# ${CONFIG_}$ARG is not set"
 168                 ;;
 169
 170         --module|-m)
 171                 set_var "${CONFIG_}$ARG" "${CONFIG_}$ARG=m"
 172                 ;;
 173
 174         --set-str)
 175                 # sed swallows one level of escaping, so we need double-escaping
 176                 set_var "${CONFIG_}$ARG" "${CONFIG_}$ARG=\"${1//\"/\\\\\"}\""
 177                 shift
 178                 ;;
 179
 180         --set-val)
 181                 set_var "${CONFIG_}$ARG" "${CONFIG_}$ARG=$1"
 182                 shift
 183                 ;;
 184         --undefine|-u)
 185                 undef_var "${CONFIG_}$ARG"
 186                 ;;
 187
 188         --state|-s)
 189                 if grep -q "# ${CONFIG_}$ARG is not set" $FN ; then
 190                         echo n
 191                 else
 192                         V="$(grep "^${CONFIG_}$ARG=" $FN)"
 193                         if [ $? != 0 ] ; then
 194                                 echo undef
 195                         else
 196                                 V="${V/#${CONFIG_}$ARG=/}"
 197                                 V="${V/#\"/}"
 198                                 V="${V/%\"/}"
 199                                 V="${V//\\\"/\"}"
 200                                 echo "${V}"
 201                         fi
 202                 fi
 203                 ;;
 204
 205         --enable-after|-E)
 206                 set_var "${CONFIG_}$B" "${CONFIG_}$B=y" "${CONFIG_}$A"
 207                 ;;
 208
 209         --disable-after|-D)
 210                 set_var "${CONFIG_}$B" "# ${CONFIG_}$B is not set" "${CONFIG_}$A"
 211                 ;;
 212
 213         --module-after|-M)
 214                 set_var "${CONFIG_}$B" "${CONFIG_}$B=m" "${CONFIG_}$A"
 215                 ;;
 216
 217         # undocumented because it ignores --file (fixme)
 218         --refresh)
 219                 yes "" | make oldconfig
 220                 ;;
 221
 222         *)
 223                 usage
 224                 ;;
 225         esac
 226 done