#!/bin/sh

# Copyright 2016, 2017, 2018 Eric Hameleers, Eindhoven, Netherlands
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.


PRGNAM=broadcom-sta
VERSION=${VERSION:-6.30.223.271}
SRCVER=${SRCVER:-35}
BUILD=${BUILD:-1}
TAG=${TAG:-alien}

NUMJOBS=${NUMJOBS:-" -j7 "}

KERNEL=${KERNEL:-$( uname -r )}

# Automatically determine the architecture we're building on:
if [ -z "$ARCH" ]; then
  case "$(uname -m)" in
    i?86) ARCH=i586 ;;
    arm*) readelf /usr/bin/file -A | egrep -q "Tag_CPU.*[4,5]" && ARCH=arm || ARCH=armv7hl ;;
    # Unless $ARCH is already set, use uname -m for all other archs:
    *) ARCH=$(uname -m) ;;
  esac
  export ARCH
fi

case "$ARCH" in
  i?86)
    ARCHSUFF=""
    ;;
  x86_64)
    ARCHSUFF="_64"
    ;;
  *)
    echo "Unsupported architecture $ARCH"
    exit 1
    ;;
esac

CWD=$(pwd)
TMP=${TMP:-/tmp}
PKG=$TMP/pkg-$PRGNAM

rm -rf $PKG
mkdir -p $TMP $PKG
cd $TMP
rm -rf $PRGNAM-$VERSION
mkdir $PRGNAM-$VERSION
cd $PRGNAM-$VERSION
tar xvf $CWD/hybrid-v${SRCVER}${ARCHSUFF}-nodebug-pcoem-$( echo $VERSION | tr . _ ).tar.?z || exit 1

# Add support for newer kernels:
for KMINOR in 7 8 11 12; do
  cat $CWD/patches/linux4${KMINOR}.patch | patch -p1 --verbose || exit 1
done

# Stability fixes:
cat $CWD/patches/001-null-pointer-fix.patch | patch -p1 --verbose || exit 1
cat $CWD/patches/002-rdtscl.patch | patch -p1 --verbose || exit 1

# Make sure ownerships and permissions are sane:
chown -R root:root .
find . \
  \( -perm 777 -o -perm 775 -o -perm 711 -o -perm 555 -o -perm 511 \) \
  -exec chmod 755 {} \; -o \
  \( -perm 666 -o -perm 664 -o -perm 600 -o -perm 444 -o -perm 440 -o -perm 400 \) \
  -exec chmod 644 {} \;

# Compile the kernel module:
make -C /lib/modules/$KERNEL/build M=$(pwd) clean
make -C /lib/modules/$KERNEL/build M=$(pwd)

# Manually install the lot:
install -Dm644 wl.ko $PKG/lib/modules/$KERNEL/kernel/extra/wl.ko
install -Dm644 $CWD/b43_blacklist.conf.new $PKG/etc/modprobe.d/b43_blacklist.conf.new

# Add documentation:
mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
cp -a \
  lib/LICENSE.txt $CWD/README* \
  $PKG/usr/doc/$PRGNAM-$VERSION
cp -ia $CWD/patches $PKG/usr/doc/$PRGNAM-$VERSION/
cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild

# Add a package description and a post-install script:
mkdir -p $PKG/install
cat $CWD/slack-desc > $PKG/install/slack-desc
cat << EOF > $PKG/install/doinst.sh
# Handle the incoming configuration files:
config() {
  for infile in \$1; do
    NEW="\$infile"
    OLD="\$(dirname \$NEW)/\$(basename \$NEW .new)"
    # If there's no config file by that name, mv it over:
    if [ ! -r \$OLD ]; then
      mv \$NEW \$OLD
    elif [ "\$(cat \$OLD | md5sum)" = "\$(cat \$NEW | md5sum)" ]; then
      # toss the redundant copy
      rm \$NEW
    fi
    # Otherwise, we leave the .new copy for the admin to consider...
  done
}
config etc/modprobe.d/b43_blacklist.conf.new

# Update kernel module dependencies information:
chroot . /sbin/depmod -a $KERNEL 1>/dev/null 2>/dev/null
EOF

cd $PKG
/sbin/makepkg -l y -c n $TMP/$PRGNAM-${VERSION}_$(echo $KERNEL |tr - _)-$ARCH-$BUILD$TAG.txz