File: findsrc

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#!/bin/sh
#
# findsrc - Find kernel or iproute2 source
#
# Written 2002 by Werner Almesberger
# Copyright 2002 Werner Almesberger
#

usage()
{
    echo "usage: $0 (-k|-i) [-v] [-x] dir ..." 1>&2
    echo "  -k  find kernel source" 1>&2
    echo "  -i  find iproute2 source" 1>&2
    echo "  -v  verbose output" 1>&2
    echo "  -x  print command for extraction" 1>&2
    exit 1
}


kernel=false
iproute2=false
extract=false
verbose=false

while [ ! -z "$1" ] && echo "$1" | grep '^-' >/dev/null; do
    case "$1" in
	-k) kernel=true;;
	-i) iproute2=true;;
	-v) verbose=true;;
	-x) extract=true;;
	*)  usage;;
    esac
    shift
done

$kernel && $iproute2 && usage
$kernel || $iproute2 || usage

if $kernel; then
    opt=--kversions
    pfx=linux-
else
    opt=--iversions
    pfx='iproute2-*'
fi

file=
for n in "$@"; do
    versions=
    for m in `configure $opt`; do
	versions="$m $versions"
    done
    for m in $versions; do
	$verbose && echo "Looking for $n/$pfx$m.tar" 1>&2
	if [ -r $n/$pfx$m.tar ]; then
	    file=$n/$pfx$m.tar
	    cmd="tar xf $n/$pfx$m.tar"
	    break 2
	fi
	$verbose && echo "Looking for $n/$pfx$m.tar.gz" 1>&2
	if [ -r $n/$pfx$m.tar.gz ]; then
	    file=$n/$pfx$m.tar.gz
	    cmd="tar xfz $n/$pfx$m.tar.gz"
	    break 2
	fi
	$verbose && echo "Looking for $n/$pfx$m.tar.bz2" 1>&2
	if [ -r $n/$pfx$m.tar.bz2 ]; then
	    file=$n/$pfx$m.tar.bz2
	    cmd="bzcat $n/$pfx$m.tar.bz2 | tar xf -"
	    break 2
	fi
    done
done

if [ -z "$file" ]; then
    echo "no suitable source archive found" 1>&2
    exit 1
fi

if $extract; then
    echo $cmd
else
    echo $file
fi