build: Remove compat-lz4

Since 2014, the OpenVPN project has shipped an adopted LZ4 library to be
enabled if no LZ4 libraries was found on the system.  This was due to
the LZ4 library not being available on all platforms and it was vastly
better than the older LZO compression algorithm.  But this was years
before VORACLE and related attack vectors affecting VPN connections,
where compression is considered a vulnerability.

The OpenVPN project is gradually moving away from supporting compression,
so shipping our own LZ4 library is no longer wanted.  It will now only
use the LZ4 compression libraries found on the host, and can otherwise
be disabled completely with ./configure --disable-lz4.

Signed-off-by: David Sommerseth <davids@openvpn.net>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <20210317220642.38741-1-openvpn@sf.lists.topphemmelig.net>
URL: https://www.mail-archive.com/search?l=mid&q=20210317220642.38741-1-openvpn@sf.lists.topphemmelig.net
Signed-off-by: Gert Doering <gert@greenie.muc.de>

1 files changed, 0 insertions, 68 deletions

diff --git a/dev-tools/lz4-rebaser.sh b/dev-tools/lz4-rebaser.sh
deleted file mode 100755
index 03debcb..0000000
--- a/dev-tools/lz4-rebaser.sh
+++ /dev/null
@@ -1,68 +0,0 @@
-#!/bin/sh
-# lz4-rebaser.sh   - Does the LZ4 rebase process in an automated fashion
-#
-# Copyright (C) 2017-2018 David Sommerseth <davids@openvpn.net>
-#
-# This program is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License
-# as published by the Free Software Foundation; either version 2
-# of the License.
-#
-# 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.
-#
-
-# Basic shell sanity
-set -eu
-
-# Simple argument control
-if [ $# -ne 1 ]; then
-    echo "Usage: $0 <Path to upstream LZ4 source tree>"
-    exit 1
-fi
-
-# Check that we have the files we need before starting the rebase
-LZ4_C="$1/lib/lz4.c"
-LZ4_H="$1/lib/lz4.h"
-if [ ! -r "$LZ4_C" -o ! -r "$LZ4_H" ]; then
-    echo "Could not locate $LZ4_H and/or $LZ4_C"
-    exit 1
-fi
-
-# Extract the upstream LZ4 commit base
-lz4_tag="$(git --git-dir $1/.git tag --contains HEAD)"
-lz4_commit="$(git --git-dir $1/.git rev-parse --short=20 HEAD)"
-
-# Do the rebase
-srcroot="$(git rev-parse --show-toplevel)"
-echo "* Copying upstream lz4.h to compat-lz4.h"
-cp "$LZ4_H" "${srcroot}/src/compat/compat-lz4.h"
-
-echo "* Porting upstream lz4.c to compat-lz4.c"
-{
-    cat <<EOF
-/* This file has been backported by $0
- * from upstream lz4 commit $lz4_commit ($lz4_tag)
- */
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#elif defined(_MSC_VER)
-#include "config-msvc.h"
-#endif
-
-#ifdef NEED_COMPAT_LZ4
-EOF
-    sed 's/\"lz4\.h\"/\"compat-lz4.h"/' "$LZ4_C"
-cat <<EOF
-#endif /* NEED_COMPAT_LZ4 */
-EOF
-} > "${srcroot}/src/compat/compat-lz4.c"
-
-echo "* Running 'git add'"
-git add src/compat/compat-lz4.[ch]