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hush/scripts/Configure

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#! /bin/sh
#
# This script is used to configure BusyBox.
#
# It was inspired by the challenge in the original Configure script
# to ``do something better'', combined with the actual need to ``do
# something better'' because the old configure script wasn't flexible
# enough.
#
# Raymond Chen was the original author of Configure.
# Michael Elizabeth Chastain (mec@shout.net) is the current maintainer.
#
# 050793 - use IFS='@' to get around a bug in a pre-version of bash-1.13
# with an empty IFS.
#
# 030995 (storner@osiris.ping.dk) - added support for tri-state answers,
# for selecting modules to compile.
#
# 180995 Bernhard Kaindl (bkaindl@ping.at) - added dummy functions for
# use with a config.in modified for make menuconfig.
#
# 301195 (boldt@math.ucsb.edu) - added help text support
#
# 281295 Paul Gortmaker - make tri_state functions collapse to boolean
# if module support is not enabled.
#
# 010296 Aaron Ucko (ucko@vax1.rockhurst.edu) - fix int and hex to accept
# arbitrary ranges
#
# 150296 Dick Streefland (dicks@tasking.nl) - report new configuration
# items and ask for a value even when doing a "make oldconfig"
#
# 200396 Tom Dyas (tdyas@eden.rutgers.edu) - when the module option is
# chosen for an item, define the macro <option_name>_MODULE
#
# 090397 Axel Boldt (boldt@math.ucsb.edu) - avoid ? and + in regular
# expressions for GNU expr since version 1.15 and up use \? and \+.
#
# 300397 Phil Blundell (pjb27@cam.ac.uk) - added support for min/max
# arguments to "int", allow dep_tristate to take a list of dependencies
# rather than just one.
#
# 090398 Axel Boldt (boldt@math.ucsb.edu) - allow for empty lines in help
# texts.
#
# 102598 Michael Chastain (mec@shout.net) - put temporary files in
# current directory, not in /tmp.
#
# 24 January 1999, Michael Elizabeth Chastain, <mec@shout.net>
# - Improve the exit message (Jeff Ronne).
#
# 7 October 2000, Ghozlane Toumi, <gtoumi@messel.emse.fr>
# added switches for "random" , "all yes" and "all modules"
#
#
# Make sure we're really running bash.
#
# I would really have preferred to write this script in a language with
# better string handling, but alas, bash is the only scripting language
# that I can be reasonable sure everybody has on their linux machine.
#
[ -z "$BASH" ] && { echo "Configure requires bash" 1>&2; exit 1; }
# Disable filename globbing once and for all.
# Enable function cacheing.
set -f -h
#
# Dummy functions for use with a config.in modified for menuconf
#
function mainmenu_option () {
:
}
function mainmenu_name () {
:
}
function endmenu () {
:
}
#
# returns a random number between 1 and $1
#
function rnd () {
rnd=$[ $RANDOM % $1 + 1 ]
}
#
# randomly chose a number in a config list (LIST_CONFIG_NAME)
# or in a range ( MIN_CONFIG_NAME MAX_CONFIG_NAME )
# ONLY if there is no forced default (and we are in an "auto" mode)
# we are limited by the range of values taken by "$RANDOM"
#
# rndval CONFIG_NAME
#
function rndval () {
[ "$AUTO" != "yes" -o -n "$old" ] && return
def_list=$(eval echo "\${LIST_$1}")
def_min=$(eval echo "\${MIN_$1}")
def_max=$(eval echo "\${MAX_$1}")
if [ -n "$def_list" ]; then
set -- $(echo $def_list | sed 's/,/ /g')
rnd $#
while [ $rnd -le $# ] ; do
def=$1
shift
done
return
fi
if [ -n "$def_min" -a -n "$def_max" ]; then
rnd $[ $def_max - $def_min ]
def=$[ $def_min + $rnd ]
fi
}
#
# help prints the corresponding help text from Configure.help to stdout
#
# help variable
#
function help () {
if [ -f Documentation/Configure.help ]
then
#first escape regexp special characters in the argument:
var=$(echo "$1"|sed 's/[][\/.^$*]/\\&/g')
#now pick out the right help text:
text=$(sed -n "/^$var[ ]*\$/,\${
/^$var[ ]*\$/c\\
${var}:\\
/^#/b
/^[^ ]/q
/<file:\\([^>]*\\)>/s//\\1/g
p
}" Documentation/Configure.help)
if [ -z "$text" ]
then
echo; echo " Sorry, no help available for this option yet.";echo
else
(echo; echo "$text") | ${PAGER:-more}
fi
else
echo;
echo " Can't access the file Documentation/Configure.help which"
echo " should contain the help texts."
echo
fi
}
#
# readln reads a line into $ans.
#
# readln prompt default oldval
#
function readln () {
if [ "$AUTO" = "yes" ]; then
echo -n "$1"
ans=$2
echo $ans
elif [ "$DEFAULT" = "-d" -a -n "$3" ]; then
echo "$1"
ans=$2
else
echo -n "$1"
[ -z "$3" ] && echo -n "(NEW) "
IFS='@' read ans || exit 1
[ -z "$ans" ] && ans=$2
fi
}
#
# comment does some pretty-printing
#
# comment 'xxx'
#
function comment () {
echo "*"; echo "* $1" ; echo "*"
(echo "" ; echo "#"; echo "# $1" ; echo "#") >>$CONFIG
(echo "" ; echo "/*"; echo " * $1" ; echo " */") >>$CONFIG_H
}
#
# define_bool sets the value of a boolean argument
#
# define_bool define value
#
function define_bool () {
define_tristate $1 $2
}
function define_tristate () {
case "$2" in
"y")
echo "$1=y" >>$CONFIG
echo "#define $1 1" >>$CONFIG_H
;;
"m")
echo "$1=m" >>$CONFIG
echo "#undef $1" >>$CONFIG_H
echo "#define $1_MODULE 1" >>$CONFIG_H
;;
"n")
echo "# $1 is not set" >>$CONFIG
echo "#undef $1" >>$CONFIG_H
;;
esac
eval "$1=$2"
}
#
# bool processes a boolean argument
#
# bool question define
#
function bool () {
old=$(eval echo "\${$2}")
def=${old:-'n'}
if [ "$AUTO" = "yes" -a -z "$old" ]; then
if [ "$RND" = "-r" ]; then
rnd 2
case $rnd in
"1") def="y" ;;
"2") def="n" ;;
esac
else
def=$DEF_ANS;
fi
fi
case "$def" in
"y" | "m") defprompt="Y/n/?"
def="y"
;;
"n") defprompt="N/y/?"
;;
esac
while :; do
readln "$1 ($2) [$defprompt] " "$def" "$old"
case "$ans" in
[yY] | [yY]es ) define_bool "$2" "y"
break;;
[nN] | [nN]o ) define_bool "$2" "n"
break;;
* ) help "$2"
;;
esac
done
}
#
# tristate processes a tristate argument
#
# tristate question define
#
function tristate () {
if [ "$CONFIG_MODULES" != "y" ]; then
bool "$1" "$2"
else
old=$(eval echo "\${$2}")
def=${old:-'n'}
if [ "$AUTO" = "yes" -a -z "$old" ]; then
if [ "$RND" = "-r" ]; then
rnd 3
case $rnd in
"1") def="y" ;;
"2") def="n" ;;
"3") def="m" ;;
esac
else
def=$DEF_ANS
fi
fi
case "$def" in
"y") defprompt="Y/m/n/?"
;;
"m") defprompt="M/n/y/?"
;;
"n") defprompt="N/y/m/?"
;;
esac
while :; do
readln "$1 ($2) [$defprompt] " "$def" "$old"
case "$ans" in
[yY] | [yY]es ) define_tristate "$2" "y"
break ;;
[nN] | [nN]o ) define_tristate "$2" "n"
break ;;
[mM] ) define_tristate "$2" "m"
break ;;
* ) help "$2"
;;
esac
done
fi
}
#
# dep_tristate processes a tristate argument that depends upon
# another option or options. If any of the options we depend upon is a
# module, then the only allowable options are M or N. If all are Y, then
# this is a normal tristate. This is used in cases where modules
# are nested, and one module requires the presence of something
# else in the kernel.
#
# dep_tristate question define default ...
#
function dep_tristate () {
old=$(eval echo "\${$2}")
def=${old:-'n'}
ques=$1
var=$2
need_module=0
shift 2
while [ $# -gt 0 ]; do
case "$1" in
n)
define_tristate "$var" "n"
return
;;
m)
need_module=1
;;
esac
shift
done
if [ $need_module = 1 ]; then
if [ "$CONFIG_MODULES" = "y" ]; then
if [ "$AUTO" = "yes" -a -z "$old" ]; then
if [ "$RND" = "-r" ]; then
rnd 2
case $rnd in
"1") def="m" ;;
"2") def="n" ;;
esac
else
def=$DEF_ANS
fi
fi
case "$def" in
"y" | "m") defprompt="M/n/?"
def="m"
;;
"n") defprompt="N/m/?"
;;
esac
while :; do
readln "$ques ($var) [$defprompt] " "$def" "$old"
case "$ans" in
[nN] | [nN]o ) define_tristate "$var" "n"
break ;;
[mM] ) define_tristate "$var" "m"
break ;;
[yY] | [yY]es ) echo
echo " This answer is not allowed, because it is not consistent with"
echo " your other choices."
echo " This driver depends on another one which you chose to compile"
echo " as a module. This means that you can either compile this one"
echo " as a module as well (with M) or leave it out altogether (N)."
echo
;;
* ) help "$var"
;;
esac
done
fi
else
tristate "$ques" "$var"
fi
}
function dep_bool () {
ques=$1
var=$2
shift 2
while [ $# -gt 0 ]; do
case "$1" in
m | n)
define_bool "$var" "n"
return
;;
esac
shift
done
bool "$ques" "$var"
}
function dep_mbool () {
ques=$1
var=$2
shift 2
while [ $# -gt 0 ]; do
case "$1" in
n)
define_bool "$var" "n"
return
;;
esac
shift
done
bool "$ques" "$var"
}
#
# define_int sets the value of a integer argument
#
# define_int define value
#
function define_int () {
echo "$1=$2" >>$CONFIG
echo "#define $1 ($2)" >>$CONFIG_H
eval "$1=$2"
}
#
# int processes an integer argument with optional limits
#
# int question define default [min max]
#
function int () {
old=$(eval echo "\${$2}")
def=${old:-$3}
if [ $# -gt 3 ]; then
min=$4
else
min=-10000000 # !!
fi
if [ $# -gt 4 ]; then
max=$5
else
max=10000000 # !!
fi
rndval $2
while :; do
readln "$1 ($2) [$def] " "$def" "$old"
if expr \( \( $ans + 0 \) \>= $min \) \& \( $ans \<= $max \) >/dev/null 2>&1 ; then
define_int "$2" "$ans"
break
else
help "$2"
fi
done
}
#
# define_hex sets the value of a hexadecimal argument
#
# define_hex define value
#
function define_hex () {
echo "$1=$2" >>$CONFIG
echo "#define $1 0x${2#*[x,X]}" >>$CONFIG_H
eval "$1=$2"
}
#
# hex processes an hexadecimal argument
#
# hex question define default
#
function hex () {
old=$(eval echo "\${$2}")
def=${old:-$3}
def=${def#*[x,X]}
rndval $2
while :; do
readln "$1 ($2) [$def] " "$def" "$old"
ans=${ans#*[x,X]}
if expr "$ans" : '[0-9a-fA-F][0-9a-fA-F]*$' > /dev/null; then
define_hex "$2" "$ans"
break
else
help "$2"
fi
done
}
#
# define_string sets the value of a string argument
#
# define_string define value
#
function define_string () {
echo "$1=\"$2\"" >>$CONFIG
echo "#define $1 \"$2\"" >>$CONFIG_H
eval "$1=\"$2\""
}
#
# string processes a string argument
#
# string question define default
#
function string () {
old=$(eval echo "\${$2}")
def=${old:-$3}
while :; do
if [ "$old" = "?" ]; then
readln "$1 ($2) [$def] " "$def" ""
else
readln "$1 ($2) [$def] " "$def" "$old"
fi
if [ "$ans" = "?" ]; then
help "$2"
else
break
fi
done
define_string "$2" "$ans"
}
#
# choice processes a choice list (1-out-of-n)
#
# choice question choice-list default
#
# The choice list has a syntax of:
# NAME WHITESPACE VALUE { WHITESPACE NAME WHITESPACE VALUE }
# The user may enter any unique prefix of one of the NAMEs and
# choice will define VALUE as if it were a boolean option.
# VALUE must be in all uppercase. Normally, VALUE is of the
# form CONFIG_<something>. Thus, if the user selects <something>,
# the CPP symbol CONFIG_<something> will be defined and the
# shell variable CONFIG_<something> will be set to "y".
#
function choice () {
question="$1"
choices="$2"
old=
def=$3
# determine default answer:
names=""
set -- $choices
firstvar=$2
while [ -n "$2" ]; do
if [ -n "$names" ]; then
names="$names, $1"
else
names="$1"
fi
if [ "$(eval echo \"\${$2}\")" = "y" ]; then
old=$1
def=$1
fi
shift; shift
done
if [ "$RND" = "-r" -a -z "$old" ] ; then
set -- $choices
rnd $#
while [ $rnd -le $# ] ; do
def=$1
shift ; shift
done
fi
val=""
while [ -z "$val" ]; do
ambg=n
readln "$question ($names) [$def] " "$def" "$old"
ans=$(echo $ans | tr a-z A-Z)
set -- $choices
while [ -n "$1" ]; do
name=$(echo $1 | tr a-z A-Z)
case "$name" in
"$ans"* | */"$ans"* )
case "$name" in
"$ans" | */"$ans"/* | \
"$ans"/* | */"$ans" )
val="$2"
break # exact match
;;
esac
if [ -n "$val" ]; then
echo;echo \
" Sorry, \"$ans\" is ambiguous; please enter a longer string."
echo
val=""
ambg=y
break
else
val="$2"
fi;;
esac
shift; shift
done
if [ "$val" = "" -a "$ambg" = "n" ]; then
help "$firstvar"
fi
done
set -- $choices
while [ -n "$2" ]; do
if [ "$2" = "$val" ]; then
echo " defined $val"
define_bool "$2" "y"
else
define_bool "$2" "n"
fi
shift; shift
done
}
CONFIG=.tmpconfig
CONFIG_H=.tmpconfig.h
FORCE_DEFAULT=.force_default
trap "rm -f $CONFIG $CONFIG_H ; exit 1" 1 2
#
# Make sure we start out with a clean slate.
#
echo "#" > $CONFIG
echo "# Automatically generated make config: don't edit" >> $CONFIG
echo "#" >> $CONFIG
echo "/*" > $CONFIG_H
echo " * Automatically generated C config: don't edit" >> $CONFIG_H
echo " */" >> $CONFIG_H
echo "#define AUTOCONF_INCLUDED" >> $CONFIG_H
DEFAULT=""
if [ "$1" = "-d" ] ; then
DEFAULT="-d"
shift
fi
RND=""
DEF_ANS=""
AUTO=""
case "$1" in
-r) RND="-r" ; AUTO="yes" ; shift ;;
-y) DEF_ANS="y" ; AUTO="yes" ; shift ;;
-m) DEF_ANS="m" ; AUTO="yes" ; shift ;;
-n) DEF_ANS="n" ; AUTO="yes" ; shift ;;
esac
CONFIG_IN=./config.in
if [ "$1" != "" ] ; then
CONFIG_IN=$1
fi
DEFAULTS=sysdeps/$TARGET_OS/defconfig
if [ -f .config ]; then
DEFAULTS=.config
fi
if [ "$AUTO" != "yes" ]; then
if [ -f $DEFAULTS ]; then
echo "#"
echo "# Using defaults found in" $DEFAULTS
echo "#"
. $DEFAULTS
sed -e 's/# \(CONFIG_[^ ]*\) is not.*/\1=n/' <$DEFAULTS >.config-is-not.$$
. .config-is-not.$$
rm .config-is-not.$$
else
echo "#"
echo "# No defaults found"
echo "#"
fi
else
if [ -f $FORCE_DEFAULT ]; then
echo "#"
echo "# Forcing defaults found in $FORCE_DEFAULT"
echo "#"
sed -e '
s/# \(CONFIG_[^ ]*\) is not.*/\1=n/;
s/# range \(CONFIG_[^ ]*\) \([^ ][^ ]*\) \([^ ][^ ]*\)/MIN_\1=\2; MAX_\1=\3/;
s/# list \(CONFIG_[^ ]*\) \([^ ][^ ]*\)/LIST_\1=\2/
' <$FORCE_DEFAULT >.default_val.$$
. .default_val.$$
rm .default_val.$$
else
echo "#"
echo "# No defaults found"
echo "#"
fi
fi
. $CONFIG_IN
rm -f .config.old
if [ -f .config ]; then
mv .config .config.old
fi
mv .tmpconfig .config
mv .tmpconfig.h include/config.h
echo
echo "*** End of BusyBox configuration."
echo "*** Check the top-level Makefile for additional configuration."
if [ ! -f .hdepend -o "$CONFIG_MODVERSIONS" = "y" ] ; then
echo "*** Next, you must run 'make dep'."
else
echo "*** Next, you may run 'make bzImage', 'make bzdisk', or 'make install'."
fi
echo
exit 0
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