utils/config

   1 #!/bin/bash
   2 # Manipulate options in a .config file from the command line
   3
   4 myname=${0##*/}
   5
   6 # If no prefix forced, use the default BR2_
   7 BR2_PREFIX="${BR2_PREFIX-BR2_}"
   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         --set-str option string
  18                              Set option to "string"
  19         --set-val option value
  20                              Set option to value
  21         --undefine|-u option Undefine option
  22         --state|-s option    Print state of option (n,y,m,undef)
  23
  24         --enable-after|-E beforeopt option
  25                              Enable option directly after other option
  26         --disable-after|-D beforeopt option
  27                              Disable option directly after other option
  28
  29         commands can be repeated multiple times
  30
  31 options:
  32         --file config-file   .config file to change (default .config)
  33         --keep-case|-k       Keep next symbols' case (dont' upper-case it)
  34         --package|-p         Operate on package (set prefix to BR2_PACKAGE_)
  35
  36 $myname doesn't check the validity of the .config file. This is done at next
  37 make time.
  38
  39 By default, $myname will upper-case the given symbol. Use --keep-case to keep
  40 the case of all following symbols unchanged.
  41
  42 $myname uses 'BR2_' as the default symbol prefix. Set the environment
  43 variable BR2_PREFIX to the prefix to use. Eg.: BR2_PREFIX="FOO_" $myname ...
  44 EOL
  45         exit 1
  46 }
  47
  48 checkarg() {
  49         ARG="$1"
  50         if [ "$ARG" = "" ] ; then
  51                 usage
  52         fi
  53         if [ "$MUNGE_CASE" = "yes" ] ; then
  54                 ARG="`echo $ARG | tr a-z- A-Z_`"
  55         fi
  56         case "$ARG" in
  57         ${BR2_PREFIX}*)
  58                 ARG="${ARG/${BR2_PREFIX}/}"
  59                 ;;
  60         esac
  61 }
  62
  63 txt_append() {
  64         local anchor="$1"
  65         local insert="$2"
  66         local infile="$3"
  67         local tmpfile="$infile.swp"
  68
  69         # sed append cmd: 'a\' + newline + text + newline
  70         cmd="$(printf "a\\%b$insert" "\n")"
  71
  72         sed -i -e "/$anchor/$cmd" "$infile"
  73 }
  74
  75 txt_subst() {
  76         local before="$1"
  77         local after="$2"
  78         local infile="$3"
  79         local tmpfile="$infile.swp"
  80
  81         sed -i -e "s:$before:$after:" "$infile"
  82 }
  83
  84 txt_delete() {
  85         local text="$1"
  86         local infile="$2"
  87         local tmpfile="$infile.swp"
  88
  89         sed -i -e "/$text/d" "$infile"
  90 }
  91
  92 set_var() {
  93         local name=$1 new=$2 before=$3
  94
  95         name_re="^($name=|# $name is not set)"
  96         before_re="^($before=|# $before is not set)"
  97         if test -n "$before" && grep -Eq "$before_re" "$FN"; then
  98                 txt_append "^$before=" "$new" "$FN"
  99                 txt_append "^# $before is not set" "$new" "$FN"
 100         elif grep -Eq "$name_re" "$FN"; then
 101                 txt_subst "^$name=.*" "$new" "$FN"
 102                 txt_subst "^# $name is not set" "$new" "$FN"
 103         else
 104                 echo "$new" >>"$FN"
 105         fi
 106 }
 107
 108 undef_var() {
 109         local name=$1
 110
 111         txt_delete "^$name=" "$FN"
 112         txt_delete "^# $name is not set" "$FN"
 113 }
 114
 115 if [ "$1" = "--file" ]; then
 116         FN="$2"
 117         if [ "$FN" = "" ] ; then
 118                 usage
 119         fi
 120         shift 2
 121 else
 122         FN=.config
 123 fi
 124
 125 if [ "$1" = "" ] ; then
 126         usage
 127 fi
 128
 129 MUNGE_CASE=yes
 130 while [ "$1" != "" ] ; do
 131         CMD="$1"
 132         shift
 133         case "$CMD" in
 134         --keep-case|-k)
 135                 MUNGE_CASE=no
 136                 continue
 137                 ;;
 138         --package|-p)
 139                 BR2_PREFIX="BR2_PACKAGE_"
 140                 continue
 141                 ;;
 142         --*-after|-E|-D|-M)
 143                 checkarg "$1"
 144                 A=$ARG
 145                 checkarg "$2"
 146                 B=$ARG
 147                 shift 2
 148                 ;;
 149         -*)
 150                 checkarg "$1"
 151                 shift
 152                 ;;
 153         esac
 154         case "$CMD" in
 155         --enable|-e)
 156                 set_var "${BR2_PREFIX}$ARG" "${BR2_PREFIX}$ARG=y"
 157                 ;;
 158
 159         --disable|-d)
 160                 set_var "${BR2_PREFIX}$ARG" "# ${BR2_PREFIX}$ARG is not set"
 161                 ;;
 162
 163         --set-str)
 164                 # sed swallows one level of escaping, so we need double-escaping
 165                 set_var "${BR2_PREFIX}$ARG" "${BR2_PREFIX}$ARG=\"${1//\"/\\\\\"}\""
 166                 shift
 167                 ;;
 168
 169         --set-val)
 170                 set_var "${BR2_PREFIX}$ARG" "${BR2_PREFIX}$ARG=$1"
 171                 shift
 172                 ;;
 173         --undefine|-u)
 174                 undef_var "${BR2_PREFIX}$ARG"
 175                 ;;
 176
 177         --state|-s)
 178                 if grep -q "# ${BR2_PREFIX}$ARG is not set" $FN ; then
 179                         echo n
 180                 else
 181                         V="$(grep "^${BR2_PREFIX}$ARG=" $FN)"
 182                         if [ $? != 0 ] ; then
 183                                 echo undef
 184                         else
 185                                 V="${V/#${BR2_PREFIX}$ARG=/}"
 186                                 V="${V/#\"/}"
 187                                 V="${V/%\"/}"
 188                                 V="${V//\\\"/\"}"
 189                                 echo "${V}"
 190                         fi
 191                 fi
 192                 ;;
 193
 194         --enable-after|-E)
 195                 set_var "${BR2_PREFIX}$B" "${BR2_PREFIX}$B=y" "${BR2_PREFIX}$A"
 196                 ;;
 197
 198         --disable-after|-D)
 199                 set_var "${BR2_PREFIX}$B" "# ${BR2_PREFIX}$B is not set" "${BR2_PREFIX}$A"
 200                 ;;
 201
 202         *)
 203                 usage
 204                 ;;
 205         esac
 206 done