scripts/Configure

   1 #! /bin/sh
   2 #
   3 # This script is used to configure the Linux kernel.
   4 #
   5 # It was inspired by the challenge in the original Configure script
   6 # to ``do something better'', combined with the actual need to ``do
   7 # something better'' because the old configure script wasn't flexible
   8 # enough.
   9 #
  10 # Raymond Chen was the original author of Configure.
  11 # Michael Elizabeth Chastain (mec@shout.net) is the current maintainer.
  12 #
  13 # 050793 - use IFS='@' to get around a bug in a pre-version of bash-1.13
  14 # with an empty IFS.
  15 #
  16 # 030995 (storner@osiris.ping.dk) - added support for tri-state answers,
  17 # for selecting modules to compile.
  18 #
  19 # 180995 Bernhard Kaindl (bkaindl@ping.at) - added dummy functions for
  20 # use with a config.in modified for make menuconfig.
  21 #
  22 # 301195 (boldt@math.ucsb.edu) - added help text support
  23 #
  24 # 281295 Paul Gortmaker - make tri_state functions collapse to boolean
  25 # if module support is not enabled.
  26 #
  27 # 010296 Aaron Ucko (ucko@vax1.rockhurst.edu) - fix int and hex to accept
  28 # arbitrary ranges
  29 #
  30 # 150296 Dick Streefland (dicks@tasking.nl) - report new configuration
  31 # items and ask for a value even when doing a "make oldconfig"
  32 #
  33 # 200396 Tom Dyas (tdyas@eden.rutgers.edu) - when the module option is
  34 # chosen for an item, define the macro <option_name>_MODULE
  35 #
  36 # 090397 Axel Boldt (boldt@math.ucsb.edu) - avoid ? and + in regular
  37 # expressions for GNU expr since version 1.15 and up use \? and \+.
  38 #
  39 # 300397 Phil Blundell (pjb27@cam.ac.uk) - added support for min/max
  40 # arguments to "int", allow dep_tristate to take a list of dependencies
  41 # rather than just one.
  42 #
  43 # 090398 Axel Boldt (boldt@math.ucsb.edu) - allow for empty lines in help
  44 # texts.
  45 #
  46 # 102598 Michael Chastain (mec@shout.net) - put temporary files in
  47 # current directory, not in /tmp.
  48 #
  49 # 24 January 1999, Michael Elizabeth Chastain, <mec@shout.net>
  50 # - Improve the exit message (Jeff Ronne).
  51
  52 #
  53 # Make sure we're really running bash.
  54 #
  55 # I would really have preferred to write this script in a language with
  56 # better string handling, but alas, bash is the only scripting language
  57 # that I can be reasonable sure everybody has on their linux machine.
  58 #
  59 [ -z "$BASH" ] && { echo "Configure requires bash" 1>&2; exit 1; }
  60
  61 # Disable filename globbing once and for all.
  62 # Enable function cacheing.
  63 set -f -h
  64
  65 #
  66 # Dummy functions for use with a config.in modified for menuconf
  67 #
  68 function mainmenu_option () {
  69         :
  70 }
  71 function mainmenu_name () {
  72         :
  73 }
  74 function endmenu () {
  75         :
  76 }
  77
  78 #
  79 # help prints the corresponding help text from Configure.help to stdout
  80 #
  81 #       help variable
  82 #
  83 function help () {
  84   if [ -f Documentation/Configure.help ]
  85   then
  86      #first escape regexp special characters in the argument:
  87      var=$(echo "$1"|sed 's/[][\/.^$*]/\\&/g')
  88      #now pick out the right help text:
  89      text=$(sed -n "/^$var[     ]*\$/,\${
  90                         /^$var[         ]*\$/c\\
  91 ${var}:\\
  92
  93                         /^#/b
  94                         /^[^    ]/q
  95                         p
  96                     }" Documentation/Configure.help)
  97      if [ -z "$text" ]
  98      then
  99           echo; echo "  Sorry, no help available for this option yet.";echo
 100      else
 101           (echo; echo "$text") | ${PAGER:-more}
 102      fi
 103   else
 104      echo;
 105      echo "  Can't access the file Documentation/Configure.help which"
 106      echo "  should contain the help texts."
 107      echo
 108   fi
 109 }
 110
 111
 112 #
 113 # readln reads a line into $ans.
 114 #
 115 #       readln prompt default oldval
 116 #
 117 function readln () {
 118         if [ "$DEFAULT" = "-d" -a -n "$3" ]; then
 119                 echo "$1"
 120                 ans=$2
 121         else
 122                 echo -n "$1"
 123                 [ -z "$3" ] && echo -n "(NEW) "
 124                 IFS='@' read ans || exit 1
 125                 [ -z "$ans" ] && ans=$2
 126         fi
 127 }
 128
 129 #
 130 # comment does some pretty-printing
 131 #
 132 #       comment 'xxx'
 133 #
 134 function comment () {
 135         echo "*"; echo "* $1" ; echo "*"
 136         (echo "" ; echo "#"; echo "# $1" ; echo "#") >>$CONFIG
 137         (echo "" ; echo "/*"; echo " * $1" ; echo " */") >>$CONFIG_H
 138 }
 139
 140 #
 141 # define_bool sets the value of a boolean argument
 142 #
 143 #       define_bool define value
 144 #
 145 function define_bool () {
 146         define_tristate $1 $2
 147 }
 148
 149 function define_tristate () {
 150         case "$2" in
 151          "y")
 152                 echo "$1=y" >>$CONFIG
 153                 echo "#define $1 1" >>$CONFIG_H
 154                 ;;
 155
 156          "m")
 157                 echo "$1=m" >>$CONFIG
 158                 echo "#undef  $1" >>$CONFIG_H
 159                 echo "#define $1_MODULE 1" >>$CONFIG_H
 160                 ;;
 161
 162          "n")
 163                 echo "# $1 is not set" >>$CONFIG
 164                 echo "#undef  $1" >>$CONFIG_H
 165                 ;;
 166         esac
 167         eval "$1=$2"
 168 }
 169
 170 #
 171 # bool processes a boolean argument
 172 #
 173 #       bool question define
 174 #
 175 function bool () {
 176         old=$(eval echo "\${$2}")
 177         def=${old:-'n'}
 178         case "$def" in
 179          "y" | "m") defprompt="Y/n/?"
 180               def="y"
 181               ;;
 182          "n") defprompt="N/y/?"
 183               ;;
 184         esac
 185         while :; do
 186           readln "$1 ($2) [$defprompt] " "$def" "$old"
 187           case "$ans" in
 188             [yY] | [yY]es ) define_bool "$2" "y"
 189                             break;;
 190             [nN] | [nN]o )  define_bool "$2" "n"
 191                             break;;
 192             * )             help "$2"
 193                             ;;
 194           esac
 195         done
 196 }
 197
 198 #
 199 # tristate processes a tristate argument
 200 #
 201 #       tristate question define
 202 #
 203 function tristate () {
 204         if [ "$CONFIG_MODULES" != "y" ]; then
 205           bool "$1" "$2"
 206         else
 207           old=$(eval echo "\${$2}")
 208           def=${old:-'n'}
 209           case "$def" in
 210            "y") defprompt="Y/m/n/?"
 211                 ;;
 212            "m") defprompt="M/n/y/?"
 213                 ;;
 214            "n") defprompt="N/y/m/?"
 215                 ;;
 216           esac
 217           while :; do
 218             readln "$1 ($2) [$defprompt] " "$def" "$old"
 219             case "$ans" in
 220               [yY] | [yY]es ) define_tristate "$2" "y"
 221                               break ;;
 222               [nN] | [nN]o )  define_tristate "$2" "n"
 223                               break ;;
 224               [mM] )          define_tristate "$2" "m"
 225                               break ;;
 226               * )             help "$2"
 227                               ;;
 228             esac
 229           done
 230         fi
 231 }
 232
 233 #
 234 # dep_tristate processes a tristate argument that depends upon
 235 # another option or options.  If any of the options we depend upon is a
 236 # module, then the only allowable options are M or N.  If all are Y, then
 237 # this is a normal tristate.  This is used in cases where modules
 238 # are nested, and one module requires the presence of something
 239 # else in the kernel.
 240 #
 241 #       dep_tristate question define default ...
 242 #
 243 function dep_tristate () {
 244         old=$(eval echo "\${$2}")
 245         def=${old:-'n'}
 246         ques=$1
 247         var=$2
 248         need_module=0
 249         shift 2
 250         while [ $# -gt 0 ]; do
 251           case "$1" in
 252             n)
 253               define_tristate "$var" "n"
 254               return
 255               ;;
 256             m)
 257               need_module=1
 258               ;;
 259           esac
 260           shift
 261         done
 262
 263         if [ $need_module = 1 ]; then
 264            if [ "$CONFIG_MODULES" = "y" ]; then
 265                 case "$def" in
 266                  "y" | "m") defprompt="M/n/?"
 267                       def="m"
 268                       ;;
 269                  "n") defprompt="N/m/?"
 270                       ;;
 271                 esac
 272                 while :; do
 273                   readln "$ques ($var) [$defprompt] " "$def" "$old"
 274                   case "$ans" in
 275                       [nN] | [nN]o )  define_tristate "$var" "n"
 276                                       break ;;
 277                       [mM] )          define_tristate "$var" "m"
 278                                       break ;;
 279                       [yY] | [yY]es ) echo
 280    echo "  This answer is not allowed, because it is not consistent with"
 281    echo "  your other choices."
 282    echo "  This driver depends on another one which you chose to compile"
 283    echo "  as a module. This means that you can either compile this one"
 284    echo "  as a module as well (with M) or leave it out altogether (N)."
 285                                       echo
 286                                       ;;
 287                       * )             help "$var"
 288                                       ;;
 289                   esac
 290                 done
 291            fi
 292         else
 293            tristate "$ques" "$var"
 294         fi
 295 }
 296
 297 function dep_bool () {
 298         ques=$1
 299         var=$2
 300         shift 2
 301         while [ $# -gt 0 ]; do
 302           case "$1" in
 303             m | n)
 304               define_bool "$var" "n"
 305               return
 306               ;;
 307           esac
 308           shift
 309         done
 310
 311         bool "$ques" "$var"
 312 }
 313
 314 function dep_mbool () {
 315         ques=$1
 316         var=$2
 317         shift 2
 318         while [ $# -gt 0 ]; do
 319           case "$1" in
 320             n)
 321               define_bool "$var" "n"
 322               return
 323               ;;
 324           esac
 325           shift
 326         done
 327
 328         bool "$ques" "$var"
 329 }
 330
 331 #
 332 # define_int sets the value of a integer argument
 333 #
 334 #       define_int define value
 335 #
 336 function define_int () {
 337         echo "$1=$2" >>$CONFIG
 338         echo "#define $1 ($2)" >>$CONFIG_H
 339         eval "$1=$2"
 340 }
 341
 342 #
 343 # int processes an integer argument with optional limits
 344 #
 345 #       int question define default [min max]
 346 #
 347 function int () {
 348         old=$(eval echo "\${$2}")
 349         def=${old:-$3}
 350         if [ $# -gt 3 ]; then
 351           min=$4
 352         else
 353           min=-10000000    # !!
 354         fi
 355         if [ $# -gt 4 ]; then
 356           max=$5
 357         else
 358           max=10000000     # !!
 359         fi
 360         while :; do
 361           readln "$1 ($2) [$def] " "$def" "$old"
 362           if expr \( \( $ans + 0 \) \>= $min \) \& \( $ans \<= $max \) >/dev/null 2>&1 ; then
 363             define_int "$2" "$ans"
 364             break
 365           else
 366             help "$2"
 367           fi
 368         done
 369 }
 370
 371 #
 372 # define_hex sets the value of a hexadecimal argument
 373 #
 374 #       define_hex define value
 375 #
 376 function define_hex () {
 377         echo "$1=$2" >>$CONFIG
 378         echo "#define $1 0x${2#*[x,X]}" >>$CONFIG_H
 379         eval "$1=$2"
 380 }
 381
 382 #
 383 # hex processes an hexadecimal argument
 384 #
 385 #       hex question define default
 386 #
 387 function hex () {
 388         old=$(eval echo "\${$2}")
 389         def=${old:-$3}
 390         def=${def#*[x,X]}
 391         while :; do
 392           readln "$1 ($2) [$def] " "$def" "$old"
 393           ans=${ans#*[x,X]}
 394           if expr "$ans" : '[0-9a-fA-F][0-9a-fA-F]*$' > /dev/null; then
 395             define_hex "$2" "$ans"
 396             break
 397           else
 398             help "$2"
 399           fi
 400         done
 401 }
 402
 403 #
 404 # define_string sets the value of a string argument
 405 #
 406 #       define_string define value
 407 #
 408 function define_string () {
 409         echo "$1=\"$2\"" >>$CONFIG
 410         echo "#define $1 \"$2\"" >>$CONFIG_H
 411         eval "$1=\"$2\""
 412 }
 413
 414 #
 415 # string processes a string argument
 416 #
 417 #       string question define default
 418 #
 419 function string () {
 420         old=$(eval echo "\${$2}")
 421         def=${old:-$3}
 422         readln "$1 ($2) [$def] " "$def" "$old"
 423         define_string "$2" "$ans"
 424 }
 425 #
 426 # choice processes a choice list (1-out-of-n)
 427 #
 428 #       choice question choice-list default
 429 #
 430 # The choice list has a syntax of:
 431 #       NAME WHITESPACE VALUE { WHITESPACE NAME WHITESPACE VALUE }
 432 # The user may enter any unique prefix of one of the NAMEs and
 433 # choice will define VALUE as if it were a boolean option.
 434 # VALUE must be in all uppercase.  Normally, VALUE is of the
 435 # form CONFIG_<something>.  Thus, if the user selects <something>,
 436 # the CPP symbol CONFIG_<something> will be defined and the
 437 # shell variable CONFIG_<something> will be set to "y".
 438 #
 439 function choice () {
 440         question="$1"
 441         choices="$2"
 442         old=
 443         def=$3
 444
 445         # determine default answer:
 446         names=""
 447         set -- $choices
 448         firstvar=$2
 449         while [ -n "$2" ]; do
 450                 if [ -n "$names" ]; then
 451                         names="$names, $1"
 452                 else
 453                         names="$1"
 454                 fi
 455                 if [ "$(eval echo \"\${$2}\")" = "y" ]; then
 456                         old=$1
 457                         def=$1
 458                 fi
 459                 shift; shift
 460         done
 461
 462         val=""
 463         while [ -z "$val" ]; do
 464                 ambg=n
 465                 readln "$question ($names) [$def] " "$def" "$old"
 466                 ans=$(echo $ans | tr a-z A-Z)
 467                 set -- $choices
 468                 while [ -n "$1" ]; do
 469                         name=$(echo $1 | tr a-z A-Z)
 470                         case "$name" in
 471                                 "$ans"* )
 472                                         if [ "$name" = "$ans" ]; then
 473                                                 val="$2"
 474                                                 break   # stop on exact match
 475                                         fi
 476                                         if [ -n "$val" ]; then
 477                                                 echo;echo \
 478                 "  Sorry, \"$ans\" is ambiguous; please enter a longer string."
 479                                                 echo
 480                                                 val=""
 481                                                 ambg=y
 482                                                 break
 483                                         else
 484                                                 val="$2"
 485                                         fi;;
 486                         esac
 487                         shift; shift
 488                 done
 489                 if [ "$val" = "" -a "$ambg" = "n" ]; then
 490                         help "$firstvar"
 491                 fi
 492         done
 493         set -- $choices
 494         while [ -n "$2" ]; do
 495                 if [ "$2" = "$val" ]; then
 496                         echo "  defined $val"
 497                         define_bool "$2" "y"
 498                 else
 499                         define_bool "$2" "n"
 500                 fi
 501                 shift; shift
 502         done
 503 }
 504
 505 CONFIG=.tmpconfig
 506 CONFIG_H=.tmpconfig.h
 507 trap "rm -f $CONFIG $CONFIG_H ; exit 1" 1 2
 508
 509 #
 510 # Make sure we start out with a clean slate.
 511 #
 512 echo "#" > $CONFIG
 513 echo "# Automatically generated make config: don't edit" >> $CONFIG
 514 echo "#" >> $CONFIG
 515
 516 echo "/*" > $CONFIG_H
 517 echo " * Automatically generated C config: don't edit" >> $CONFIG_H
 518 echo " */" >> $CONFIG_H
 519 echo "#define AUTOCONF_INCLUDED" >> $CONFIG_H
 520
 521 DEFAULT=""
 522 if [ "$1" = "-d" ] ; then
 523         DEFAULT="-d"
 524         shift
 525 fi
 526
 527 CONFIG_IN=./config.in
 528 if [ "$1" != "" ] ; then
 529         CONFIG_IN=$1
 530 fi
 531
 532 DEFAULTS=arch/$ARCH/defconfig
 533 if [ -f .config ]; then
 534   DEFAULTS=.config
 535 fi
 536
 537 if [ -f $DEFAULTS ]; then
 538   echo "#"
 539   echo "# Using defaults found in" $DEFAULTS
 540   echo "#"
 541   . $DEFAULTS
 542   sed -e 's/# \(.*\) is not.*/\1=n/' < $DEFAULTS > .config-is-not.$$
 543   . .config-is-not.$$
 544   rm .config-is-not.$$
 545 else
 546   echo "#"
 547   echo "# No defaults found"
 548   echo "#"
 549 fi
 550
 551 . $CONFIG_IN
 552
 553 rm -f .config.old
 554 if [ -f .config ]; then
 555         mv .config .config.old
 556 fi
 557 mv .tmpconfig .config
 558 mv .tmpconfig.h include/linux/autoconf.h
 559
 560 echo
 561 echo "*** End of Linux kernel configuration."
 562 echo "*** Check the top-level Makefile for additional configuration."
 563 if [ ! -f .hdepend -o "$CONFIG_MODVERSIONS" = "y" ] ; then
 564     echo "*** Next, you must run 'make dep'."
 565 else
 566     echo "*** Next, you may run 'make zImage', 'make zdisk', or 'make zlilo'."
 567 fi
 568 echo
 569
 570 exit 0