File pack_v8_source.sh of Package v8

#!/bin/bash
#
# forgive me for the state of this script

v8_svn_dir="$1"

name=v8
major="`cat $v8_svn_dir/src/version.cc | grep MAJOR_VERSION |grep define | awk {'print $3'}`"
minor="`cat $v8_svn_dir/src/version.cc | grep MINOR_VERSION |grep define | awk {'print $3'}`"
build="`cat $v8_svn_dir/src/version.cc | grep BUILD_NUMBER |grep define | awk {'print $3'}`"
patch="`cat $v8_svn_dir/src/version.cc | grep PATCH_LEVEL |grep define | awk {'print $3'}`"

echo "Version: $major.$minor.$build.$patch"

xz="`which xz 2>/dev/null`"
lzma="`which lzma 2>/dev/null`"


if [ -z $v8_svn_dir ]
then
	echo "Usage:  `basename $0` [SVN_SOURCE_DIR]"
	exit 1
fi

if [ -f $xz ]
then
	compress=$xz
	compress_opts='-9 -F lzma' #xz compresses MUCH faster, so why not make it compress more?  We have the RAM...
	echo "using xz"
else
	compress=$lzma
	compress_opts="-7"
	echo "using lzma"
fi

echo 
echo "Recompressing and excluding svn data"
echo "  this takes a while, sorry"
echo "  Compressing with $compress"

cd $v8_svn_dir/
cd ..

tar --exclude=\.svn -cf - $name/ | $compress ${compress_opts} > "$name"."$major"."$minor"."$build"."$patch".tar.lzma