#!/bin/sh

# Slackware build script for xen

# Copyright 2010, 2011, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020  Mario Preksavec, Zagreb, Croatia
# Modified by Rafael Tavares <mdrafaeltavares@gmail.com> for gfs (2021),
# Based on ArchLinux PKGBUILD script (Thanks a lot!):
# https://aur.archlinux.org/cgit/aur.git/tree/PKGBUILD?h=xen
# 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=$(basename $0 | cut -f1 -d.)
VERSION=${VERSION:-$(find . -maxdepth 1 -name "$PRGNAM-*.tar.?z*" | rev | cut -f 3- -d . | cut -f 1 -d - | rev)}
BUILD=${BUILD:-1}
TAG=${TAG:-_gfs}

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/gfs}
PKG=$TMP/package-$PRGNAM
OUTPUT=${OUTPUT:-/tmp}
JOBS=${JOBS:-" -j$(expr $(getconf _NPROCESSORS_ONLN) \* 2 ) "}

if [ "$ARCH" = "i586" ]; then
  SLKCFLAGS="-O2 -march=i586 -mtune=i686"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "i686" ]; then
  SLKCFLAGS="-O2 -march=i686 -mtune=i686"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="-O2 -fPIC"
  LIBDIRSUFFIX="64"
  if [ ! -e /usr/include/gnu/stubs-32.h ]; then
   ln -vs /usr/include/gnu/stubs-64.h /usr/include/gnu/stubs-32.h
  fi
else
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
fi

CONF_XEN="--disable-rombios"
CONF_QEMUU="--sysconfdir=/etc"

case "${BUILD_STUBDOM:-yes}" in
  yes) CONF_XEN+=" --enable-stubdom" ;;
    *) CONF_XEN+=" --disable-stubdom" ;;
esac

case "${WITH_OVMF:-no}" in
  no) CONF_XEN+=" --disable-ovmf" ;;
   *) case "$ARCH" in
        i?86) cat << EOF

  Disabling 32bit EFI/UEFI guest support (WITH_OVMF=no)

EOF
              CONF_XEN+=" --disable-ovmf" ;;
           *) CONF_XEN+=" --enable-ovmf" ;;
      esac
esac

case "${USE_LIBSSH:-yes}" in
  yes) CONF_QEMUU+=" --enable-libssh" ;;
    *) CONF_QEMUU+=" --disable-libssh" ;;
esac

case "${USE_GTK:-yes}" in
  yes) CONF_QEMUU+=" --enable-gtk" ;;
    *) CONF_QEMUU+=" --disable-gtk" ;;
esac

case "${USE_SPICE:-yes}" in
  yes) CONF_QEMUU+=" --enable-spice" ;;
    *) CONF_QEMUU+=" --disable-spice" ;;
esac

case "${USE_AUDIO:-yes}" in
  yes) CONF_QEMUU+="" ;;
   no) CONF_QEMUU+=" --audio-drv-list=" ;;
    *) CONF_QEMUU+=" --audio-drv-list=$USE_AUDIO" ;;
esac

set -e

UMASKBKP=$(umask)
umask 0022

DEPCHK=""
OPTDEP=""

if [ -z $VERSION ]
 then
 VERSION=4.15.0
fi

MDSCHK=899d5b9dd6725543cf3b224de9a5d27a
DWNLCMD=${DWNLCMD:-"wget -c --no-check-certificate"}
SRCDOWN=${SRCDOWN:-"https://downloads.xenproject.org/release/xen/$VERSION/xen-$VERSION.tar.gz"}

if [ -z $(find . -maxdepth 1 -name "$PRGNAM-$VERSION.tar.?z*") ]
then
 $DWNLCMD $SRCDOWN
else
 if md5sum -c <<<"$MDSCHK $(echo $PRGNAM-$VERSION.tar.?z*)";
  then
   continue
  else
   rm -rf $PRGNAM-$VERSION.tar.?z*
   $DWNLCMD $SRCDOWN
 fi
fi

rm -rf $PKG
mkdir -p $TMP $PKG $OUTPUT
cd $TMP
rm -rf $PRGNAM-$VERSION
echo "Extracting tarball..."
tar xf $CWD/$PRGNAM-$VERSION.tar.gz
cd $PRGNAM-$VERSION
chown -R root:root .
find -L . \
 \( -perm 777 -o -perm 775 -o -perm 750 -o -perm 711 -o -perm 555 \
  -o -perm 511 \) -exec chmod 755 {} \; -o \
 \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
  -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;

patch -Np1 -i $CWD/no-ld-no-pie.patch

CFLAGS="$SLKCFLAGS" \
CXXFLAGS="$SLKCFLAGS" \
./configure \
  --prefix=/usr \
  --libdir=/usr/lib${LIBDIRSUFFIX} \
  --libexecdir=/usr/libexec \
  --sysconfdir=/etc \
  --localstatedir=/var \
  --mandir=/usr/man \
  --docdir=/usr/doc/$PRGNAM-$VERSION \
  $CONF_XEN \
  --enable-githttp \
  --enable-tools \
  --disable-qemu-traditional \
  --with-extra-qemuu-configure-args="$CONF_QEMUU" \
  --build=$ARCH-slackware-linux

CFLAGS="$SLKCFLAGS" \
CXXFLAGS="$SLKCFLAGS" \
make $JOBS || make

CFLAGS="$SLKCFLAGS" \
CXXFLAGS="$SLKCFLAGS" \
make $JOBS install-xen \
  docdir=/usr/doc/$PRGNAM-$VERSION \
  DOCDIR=/usr/doc/$PRGNAM-$VERSION \
  mandir=/usr/man \
  MANDIR=/usr/man \
  DESTDIR=$PKG

CFLAGS="$SLKCFLAGS" \
CXXFLAGS="$SLKCFLAGS" \
make $JOBS install-tools \
  docdir=/usr/doc/$PRGNAM-$VERSION \
  DOCDIR=/usr/doc/$PRGNAM-$VERSION \
  mandir=/usr/man \
  MANDIR=/usr/man \
  DESTDIR=$PKG

if [ "$BUILD_STUBDOM" = "yes" ]; then
  CFLAGS="$SLKCFLAGS" \
  CXXFLAGS="$SLKCFLAGS" \
  make $JOBS install-stubdom \
    docdir=/usr/doc/$PRGNAM-$VERSION \
    DOCDIR=/usr/doc/$PRGNAM-$VERSION \
    mandir=/usr/man \
    MANDIR=/usr/man \
    DESTDIR=$PKG
fi

CFLAGS="$SLKCFLAGS" \
CXXFLAGS="$SLKCFLAGS" \
make $JOBS install-docs \
  docdir=/usr/doc/$PRGNAM-$VERSION \
  DOCDIR=/usr/doc/$PRGNAM-$VERSION \
  mandir=/usr/man \
  MANDIR=/usr/man \
  DESTDIR=$PKG

# Remove useless symlinks in boot/
find $PKG/boot/ -type l -a -name "xen-*" -exec rm -f {} \; 2>/dev/null || true

# Move from SYSV to BSD init scripts
( cd $PKG/etc/rc.d/init.d && for i in * ; do mv $i ../rc.$i.new ; done )

# Remove empty directories
rmdir $PKG/etc/rc.d/init.d/

# Append .new to config files
for i in $PKG/etc/{default/*,xen/*.conf} ; do mv $i $i.new ; done

# Remove some executable flags
chmod -x $PKG/usr/libexec/xen/boot/*.gz 2>/dev/null || true

find $PKG | xargs file | grep -e "executable" -e "shared object" | grep ELF \
  | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null || true

find $PKG/usr/man -type f -exec gzip -9 {} \;
for i in $( find $PKG/usr/man -type l ) ; do ln -s $( readlink $i ).gz $i.gz ; rm $i ; done

if [ "${INSTALL_OPENVSWITCH_EXTENDED:-yes}" != "no" ]; then
  install -m777 -oroot -groot $CWD/openvswitch/vif-openvswitch-extended \
    $PKG/etc/xen/scripts/vif-openvswitch-extended
  install -m777 -oroot -groot $CWD/openvswitch/openvswitch-clean.sh \
    $PKG/usr/bin/openvswitch-clean
  cp $CWD/openvswitch/openvswitch.conf $PKG/etc/xen/openvswitch.conf.new
  cp $CWD/openvswitch/README.openvswitch-extended $PKG/usr/doc/$PRGNAM-$VERSION
else
  cp -r $CWD/openvswitch $PKG/usr/doc/$PRGNAM-$VERSION
fi

cp -r COPYING MAINTAINERS README $CWD/{dom0,domU} $PKG/usr/doc/$PRGNAM-$VERSION
cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild
cat $CWD/README.SLACKWARE > $PKG/usr/doc/$PRGNAM-$VERSION/README.SLACKWARE

mkdir -p $PKG/install
#      |-----handy-ruler------------------------------------------------------|
cat <<EOT >$PKG/install/slack-desc
$PRGNAM:
$PRGNAM: xen (the Xen virtualization hypervisor)
$PRGNAM:
$PRGNAM: The Xen hypervisor, the powerful open source industry standard for
$PRGNAM: virtualization, offers a powerful, efficient, and secure feature set
$PRGNAM: for virtualization of x86, x86_64, IA64, ARM, and other CPU
$PRGNAM: architectures. It supports a wide range of guest operating systems
$PRGNAM: including Windows, Linux, Solaris, and various versions of the BSD
$PRGNAM: operating systems.
$PRGNAM:
$PRGNAM: Homepage: http://www.xenproject.org/
EOT

cat <<\EOT >$PKG/install/doinst.sh
config() {
  NEW="$1"
  OLD="$(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...
}

preserve_perms() {
  NEW="$1"
  OLD="$(dirname $NEW)/$(basename $NEW .new)"
  if [ -e $OLD ]; then
    cp -a $OLD ${NEW}.incoming
    cat $NEW > ${NEW}.incoming
    mv ${NEW}.incoming $NEW
  fi
  config $NEW
}

find etc/rc.d -type f -name 'rc.xen*.new' \
  | while read new ; do preserve_perms $new ; done

find etc/default -type f -name 'xen*.new' \
  | while read new ; do config $new ; done

find etc/xen -type f -name '*.new' \
  | while read new ; do config $new ; done
EOT

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

umask ${UMASKBKP}