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+#!/bin/sh
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+
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+# miniconfig.sh copyright 2005 by Rob Landley <rob@landley.net>
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+# Licensed under the GNU General Public License version 2.
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+#
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+# This script aids in building a mini.config from a fully fledged kernel
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+# config. To do so, change into the kernel source directory and call this
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+# script with the full config as first parameter. The output will be written to
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+# a file named 'mini.config' in the same directory.
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+#
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+# Beware: This runs for a long time and the output might not be optimal. When
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+# using it, bring some beer but don't drink too much so you're still able to
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+# manually review the output in the end.
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+
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+if [ $# -ne 1 ] || [ ! -f "$1" ]; then
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+ echo "Usage: miniconfig.sh configfile"
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+ exit 1
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+fi
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+
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+if [ "$1" == ".config" ]; then
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+ echo "It overwrites .config, rename it and try again."
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+ exit 1
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+fi
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+
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+cp $1 mini.config
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+echo "Calculating mini.config..."
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+
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+LENGTH=`cat $1 | wc -l`
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+
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+# Loop through all lines in the file
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+I=1
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+while true; do
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+ if [ $I -gt $LENGTH ]; then
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+ exit
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+ fi
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+ sed -n "${I}!p" mini.config > .config.test
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+ # Do a config with this file
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+ make allnoconfig KCONFIG_ALLCONFIG=.config.test > /dev/null
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+
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+ # Compare. The date changes so expect a small difference each time.
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+ D=`diff .config $1 | wc -l`
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+ if [ $D -eq 4 ]; then
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+ mv .config.test mini.config
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+ LENGTH=$[$LENGTH-1]
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+ else
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+ I=$[$I + 1]
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+ fi
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+ echo -n -e $I/$LENGTH lines `cat mini.config | wc -c` bytes "\r"
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+done
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+echo
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