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|
#! /bin/sh
#
# This script is used to configure the linux kernel.
#
# 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.
#
# Please send comments / questions / bug fixes to raymondc@microsoft.com.
#
# Each line in the config file is a command.
#
# # internal comment
#
# Lines beginning with a `#' are ignored.
#
# : message
#
# `:' causes the line to be echoed to the screen.
#
# * external comment
#
# `*' causes the line to be placed in the output
# configuration file as a comment as well as being
# echoed to the screen.
#
# if condition
# ... commands ...
# else
# ... commands ...
# fi
#
# This does the obvious thing. The `else' clause is
# optional. Conditionals can be nested.
#
# The `condition' can be any valid bash expression.
# They typically involve tests against environment
# variables set by configuration options. For example,
#
# if [ "$CONFIG_SCSI" = "y" ]
# ...More stuff...
# fi
#
# Note! That there is no `then' keyword.
#
# bool 'prompt' CONFIG_VARIABLE default
#
# This prompts the user for a boolean value.
# The prompt may not contain an apostrophe.
# `default' should be either `y' or `n'.
# The user's response is recorded in four places.
#
# In .config, if `y'
# CONFIG_VARIABLE = CONFIG_VARIABLE
# In .config, if `n'
# # CONFIG_VARIABLE is not set
#
# In autoconf.h, if `y'
# #define CONFIG_VARIABLE 1
# In autoconf.h, if `n'
# #undef CONFIG_VARIABLE
#
# In config.in, if `y'
# bool 'prompt' CONFIG_VARIABLE y
# In config.in, if `n'
# bool 'prompt' CONFIG_VARIABLE n
#
# In the environment of the Configure script, if `y'
# CONFIG_VARIABLE = y
# In the environment of the Configure script, if `n'
# CONFIG_VARIABLE = n
#
# The value is placed into the environment of the Configure
# script so that later parts of config.in can use the `if'
# command to inspect the results of previous queries.
#
# int 'prompt' CONFIG_VARIABLE default
#
# This prompts the user for an integer value.
# The prompt may not contain an apostrophe.
# `default' should be an integer.
#
# The response is recorded as follows.
#
# In .config
# CONFIG_VARIABLE = response
# In autoconf.h
# #define CONFIG_VARIABLE (response)
# In config.in
# int 'prompt' CONFIG_VARIABLE response
# In the environment of the Configure script
# CONFIG_VARIABLE = response
#
# 050793 - use IFS='@' to get around a bug in a pre-version of bash-1.13
# with an empty IFS.
#
# Make sure we're really running bash.
#
# I would really have preferred to write this script in a language with
# better string handling, but alas, bash is the only scripting language
# that I can be reasonable sure everybody has on their linux machine.
#
[ -z "$BASH" ] && { echo "Configure requires bash" 1>&2; exit 1; }
# Disable filename globbing once and for all.
# Enable function cacheing.
set -f -h
#
# readln reads a line into $ans.
#
# readln prompt default
#
function readln () {
echo -n "$1"
IFS='@' read ans </dev/tty || exit 1
[ -z "$ans" ] && ans=$2
}
# bool processes a boolean argument
#
# bool tail
#
function bool () {
# Slimier hack to get bash to rescan a line.
eval "set -- $1"
ans=""
while [ "$ans" != "y" -a "$ans" != "n" ]; do
readln "$1 ($2) [$3] " "$3"
done
if [ "$ans" = "y" ]; then
echo "$2 = $2" >>$CONFIG
echo "#define $2 1" >>$CONFIG_H
else
echo "# $2 is not set" >>$CONFIG
echo "#undef $2" >>$CONFIG_H
fi
raw_input_line="bool '$1' $2 $ans"
eval "$2=$ans"
}
# int processes an integer argument
#
# int tail
#
function int () {
# Slimier hack to get bash to rescan a line.
eval "set -- $1"
ans="x"
while [ $[$ans+0] != "$ans" ]; do
readln "$1 ($2) [$3] " "$3"
done
echo "$2 = $ans" >>$CONFIG
echo "#define $2 ($ans)" >>$CONFIG_H
raw_input_line="int '$1' $2 $ans"
eval "$2=$ans"
}
CONFIG=.tmpconfig
CONFIG_H=include/linux/autoconf.h
trap "rm -f $CONFIG $CONFIG_H config.new ; exit 1" 1 2
#
# Make sure we start out with a clean slate.
#
> config.new
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
stack=''
branch='t'
while IFS='@' read raw_input_line
do
# Slimy hack to get bash to rescan a line.
read cmd rest <<-END_OF_COMMAND
$raw_input_line
END_OF_COMMAND
if [ "$cmd" = "*" ]; then
if [ "$branch" = "t" ]; then
echo "$raw_input_line"
echo "# $rest" >>$CONFIG
if [ "$prevcmd" != "*" ]; then
echo >>$CONFIG_H
echo "/* $rest" >>$CONFIG_H
else
echo " * $rest" >>$CONFIG_H
fi
prevcmd="*"
fi
else
[ "$prevcmd" = "*" ] && echo " */" >>$CONFIG_H
prevcmd=""
case "$cmd" in
:) [ "$branch" = "t" ] && echo "$raw_input_line" ;;
int) [ "$branch" = "t" ] && int "$rest" ;;
bool) [ "$branch" = "t" ] && bool "$rest" ;;
exec) [ "$branch" = "t" ] && ( sh -c "$rest" ) ;;
if) stack="$branch $stack"
if [ "$branch" = "t" ] && eval "$rest"; then
branch=t
else
branch=f
fi ;;
else) if [ "$branch" = "t" ]; then
branch=f
else
read branch rest <<-END_OF_STACK
$stack
END_OF_STACK
fi ;;
fi) [ -z "$stack" ] && echo "Error! Extra fi." 1>&2
read branch stack <<-END_OF_STACK
$stack
END_OF_STACK
;;
esac
fi
echo "$raw_input_line" >>config.new
done
[ "$prevcmd" = "*" ] && echo " */" >>$CONFIG_H
[ -z "$stack" ] || echo "Error! Untermiated if." 1>&2
mv config.in config.old
mv config.new config.in
echo
echo "The linux kernel is now hopefully configured for your setup."
echo "Check the top-level Makefile for additional configuration,"
echo "and do a 'make dep ; make clean' if you want to be sure all"
echo "the files are correctly re-made"
echo
exit 0
|
