This is just such an ebuild!

glgo-1.3.1.ebuild (text/plain), 2.55 KB, created by Paul Miller on 2006-01-08 06:05:37 UTC

# Copyright 1999-2005 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: /home/cvs/lportage/games-board/glgo/glgo-1.3.1.ebuild,v 1.30 2006/01/07 14:59:13 jettero Exp $
# vi:filetype=ebuild:

DESCRIPTION="PANDA-glGo"
HOMEPAGE="http://www.pandanet.co.jp/English/glgo/"

# This file should never change, it's just a .keep file...
# All the real magic is in the ebuild
SRC_URI="http://www.pandanet.co.jp/English/glgo/downloads/glGo-${PV}.rpm"

LICENSE="perl"
SLOT="0"
KEYWORDS="x86"
IUSE=""

DEPEND="app-arch/rpm2targz dev-lang/perl"
RDEPEND="
    virtual/libc virtual/x11
    media-libs/libsdl
    media-libs/sdl-sound
    media-libs/sdl-mixer
    media-libs/sdl-net
    media-libs/sdl-image
    media-libs/sdl-ttf
    dev-libs/expat
"

src_unpack() {
	cd "${WORKDIR}" || die "cd failed"
	rpm2targz "${DISTDIR}/${A}" || die "rpm2targz failed"
}

src_install() {
	cd ${D} || die "cd failed"
	tar -zxvvf "${WORKDIR}/glGo-${PV}".tar.gz || die "unpack failed"

	einfo "making correctly located libdir and moving libs into it"
	mkdir -p usr/games/lib || die "couldn't make usr/games dir in ${D}"
	mv -v usr/lib/games/glGo/* usr/games/lib || die "couldn't move glGo libs to appropriate location"

	einfo "cleaning up wrong lib dir mess";
	rmdir -v usr/lib/games/glGo/ || die "couldn't remove wrong dir #1 (lib/games/glGo)"
	rmdir -v usr/lib/games || die "couldn't remove wrong dir #2 (lib/games)"
	rmdir -v usr/lib/ || die "couldn't remove superfluous libdir"
	
	einfo "chowning to :games"
	chown -R :games usr/games

	einfo "putting binaries in games/bin"
	cd usr/games || die "couldn't get into the games dir"
	mkdir bin || die "coudln't make the bin dir"
	for f in *; do
		if [ -f "$f" ]; then
			mv -v $f bin/ || die "couldn't move $f to games/bin/"
		fi
	done

	einfo "fixing wrong libexpat dependancy with vile hack"
	cd ${D}/usr/games/bin || die "couldn't get in the right place for the vile hack"
	perl -e '
        use strict;
        use Fcntl qw(:seek);

        my $deploc = 0x7833;
        my $deplen =     13;

        open PATCH, "+<glGo" or die $!;
        seek PATCH, $deploc, SEEK_SET or die $!;

        my $buf;
        read(PATCH, $buf, $deplen) or die $!;
        $buf eq "libexpat.so.1" or die "failed to locate the incorrect depenedancy";

        seek PATCH, $deploc, SEEK_SET or die $!;
        print PATCH "libexpat.so.0" or die $!;
        close PATCH;
    ' || die "vile hack part2 failed"

	x=`strings glGo | grep libexpat`
	if [ -L "/usr/lib/$x" ]; then
		einfo "vile hack complete"
	else
		die "vile hack failed even though it succeeded"
	fi
}