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#!/bin/bash

# Slackware build script for Realtek RTL8821CE Driver

# Copyright 2020 Andrzej Telszewski, Szczecin
# All rights reserved.
#
# Redistribution and use of this script, with or without modification, is
# permitted provided that the following conditions are met:
#
# 1. Redistributions of this script must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#
#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
#  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
#  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
#  EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
#  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
#  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
#  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
#  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
#  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
#  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

PRGNAM=rtl8821ce
VERSION=${VERSION:-20201006_fe97b50}
BUILD=${BUILD:-1}
TAG=${TAG:-_SBo}

KERNEL=${KERNEL:-$(uname -r)}
KERNELPATH=${KERNELPATH:-/lib/modules/${KERNEL}/build}
PKG_VERS=${VERSION}_$(printf "%s" "${KERNEL}" | tr - _)

if [ -z "$ARCH" ]; then
  case "$( uname -m )" in
    i?86) ARCH=i586 ;;
    arm*) ARCH=arm ;;
       *) ARCH=$( uname -m ) ;;
  esac
fi

CWD=$(pwd)
TMP=${TMP:-/tmp/SBo}
PKG=${PKG:-$TMP/package-$PRGNAM}
OUTPUT=${OUTPUT:-/tmp}

set -e

rm -rf $PKG
mkdir -p $TMP $PKG $OUTPUT
cd $TMP

rm -rf $PRGNAM-$VERSION
tar xvf $CWD/$PRGNAM-$VERSION.tar.gz
cd $PRGNAM-$VERSION

chown -R root:root .
chmod -R a-st,u+rwX,go-w+rX .

# Optimize with -O2, inline with Slackware.

patch -p1 < $CWD/opt-for-performance.patch

# Allow building for kernels other than the running one.

patch -p1 < $CWD/allow-kver-ksrc.patch

make KVER=${KERNEL} KSRC=${KERNELPATH}

mkdir -p $PKG/lib/modules/$KERNEL/kernel/drivers/net/wireless/realtek/rtlwifi/$PRGNAM
install -m 0644 8821ce.ko $PKG/lib/modules/$KERNEL/kernel/drivers/net/wireless/realtek/rtlwifi/$PRGNAM

mkdir -p $PKG/usr/doc/$PRGNAM-$PKG_VERS
cp -a COPYING README.md $PKG/usr/doc/$PRGNAM-$PKG_VERS
cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$PKG_VERS/$PRGNAM.SlackBuild

mkdir -p $PKG/install
cat $CWD/slack-desc > $PKG/install/slack-desc
sed $CWD/doinst.sh -e "s%@KERNEL@%$KERNEL%" > $PKG/install/doinst.sh

cd $PKG
/sbin/makepkg -l y -c n $OUTPUT/$PRGNAM-$PKG_VERS-$ARCH-$BUILD$TAG.${PKGTYPE:-tgz}