scripts/config

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