scripts/config

   1 #!/bin/bash
   2 # Manipulate options in a .config file from the command line
   3
   4 myname=${0##*/}
   5
   6 # If no prefix forced, use the default CONFIG_
   7 CONFIG_="${CONFIG_-CONFIG_}"
   8
   9 usage() {
  10         cat >&2 <<EOL
  11 Manipulate options in a .config file from the command line.
  12 Usage:
  13 $myname options command ...
  14 commands:
  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
  34 options:
  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
  39 make time.
  40
  41 By default, $myname will upper-case the given symbol. Use --keep-case to keep
  42 the case of all following symbols unchanged.
  43
  44 $myname uses 'CONFIG_' as the default symbol prefix. Set the environment
  45 variable CONFIG_ to the prefix to use. Eg.: CONFIG_="FOO_" $myname ...
  46 EOL
  47         exit 1
  48 }
  49
  50 checkarg() {
  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
  65 txt_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
  79 txt_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
  90 txt_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
 100 set_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
 116 undef_var() {
 117         local name=$1
 118
 119         txt_delete "^$name=" "$FN"
 120         txt_delete "^# $name is not set" "$FN"
 121 }
 122
 123 if [ "$1" = "--file" ]; then
 124         FN="$2"
 125         if [ "$FN" = "" ] ; then
 126                 usage
 127         fi
 128         shift 2
 129 else
 130         FN=.config
 131 fi
 132
 133 if [ "$1" = "" ] ; then
 134         usage
 135 fi
 136
 137 MUNGE_CASE=yes
 138 while [ "$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
 225 done
 226