#! /bin/sh
#
# Copyright (C) 2009 Intel Corporation <linux-wimax@intel.com>
# Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License version
# 2 as published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301, USA.
#
#
# See help for args
#
set -eua
shopt -s extglob

function log
{
    echo $@ 1>&2
}

if [ $# != 1 ]
then
    cat 1>&2 <<EOF
E: bad arguments
Usage: $(basename $0) REV

This script generates a tar archive of the GIT tree with proper
versioning information. 

REV is a changeset id or (external) tag name for which the archive
should be generated.

Has to be run from inside the tree.
EOF
    exit 1
fi

tmpdir=`mktemp -d` 
rev=$1
name=${name:-wimax}
if ! desc=$(git describe --tags --always $rev)
then
    echo "E: can't describe revision specification $1"
    exit 1
fi
if [ $rev = HEAD ]
then
    rev=$desc
fi
# Remove leading v from vM.m.p
name_rev="$(echo "$rev" | sed '/^v[0-9]\+/s/^v//')"

git archive --format=tar --prefix=$name-$name_rev/ $rev > $tmpdir/ar.tar
mkdir $tmpdir/tree
tar xf $tmpdir/ar.tar -C $tmpdir/tree
echo $rev > $tmpdir/tree/$name-$name_rev/.git_archive.txt
tar czf $name-$name_rev.tar.gz -C $tmpdir/tree .
tar cjf $name-$name_rev.tar.bz2 -C $tmpdir/tree .
rm -rf $tmpdir/