#!/bin/bash

# Slackware build script for xen

# Copyright 2010, 2021  Mario Preksavec, Zagreb, Croatia
# 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.

cd $(dirname $0) ; CWD=$(pwd)

PRGNAM=xen
VERSION=${VERSION:-4.15.1}
BUILD=${BUILD:-1}
TAG=${TAG:-_SBo}
PKGTYPE=${PKGTYPE:-tgz}

SEABIOS=${SEABIOS:-1.14.0}
OVMF=${OVMF:-20200807_a3741780fe}
IPXE=${IPXE:-3c040ad387099483102708bb1839110bc788cefb}

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

# If the variable PRINT_PACKAGE_NAME is set, then this script will report what
# the name of the created package would be, and then exit. This information
# could be useful to other scripts.
if [ ! -z "${PRINT_PACKAGE_NAME}" ]; then
  echo "$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.$PKGTYPE"
  exit 0
fi

TMP=${TMP:-/tmp/SBo}
PKG=$TMP/package-$PRGNAM
OUTPUT=${OUTPUT:-/tmp}

if [ "$ARCH" = "i586" ]; then
    cat << EOF

  *** Xen x86/32 target no longer supported!

EOF
    exit 1
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="-O2 -fPIC"
  LIBDIRSUFFIX="64"
  if [ ! -e /usr/include/gnu/stubs-32.h ]; then
    cat << EOF

  HVM domain support (hvmloader) requires 32bit libs (multilib),
  or you can try symlinking stubs-64.h to stubs-32.h like this:

  # ln -s /usr/include/gnu/stubs-64.h /usr/include/gnu/stubs-32.h

EOF
    exit 1
  fi
else
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
fi

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

case "${BUILD_STUBDOM:-no}" in
  yes) CONF_XEN+=" --enable-stubdom" ;;
    *) CONF_XEN+=" --disable-stubdom" ;;
esac

case "${WITH_OVMF:-yes}" in
  no) CONF_XEN+=" --disable-ovmf" ;;
   *) case "$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:-no}" in
  yes) CONF_QEMUU+=" --enable-libssh" ;;
    *) CONF_QEMUU+=" --disable-libssh" ;;
esac

case "${USE_GTK:-no}" in
  yes) CONF_QEMUU+=" --enable-gtk" ;;
    *) CONF_QEMUU+=" --disable-gtk" ;;
esac

case "${USE_SPICE:-no}" in
  yes) CONF_QEMUU+=" --enable-spice" ;;
    *) CONF_QEMUU+=" --disable-spice" ;;
esac

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

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 .
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 {} \;

# Apply Xen Security Advisory patches
for i in $CWD/xsa/* ; do
  case $i in
    *qemut*.patch) patch --verbose -d tools/qemu-xen-traditional -p1 <$i ;;
     *qemu*.patch) patch --verbose -d tools/qemu-xen -p1 <$i ;;
          *.patch) patch --verbose -p1 <$i ;;
  esac
done

# Remove hardlinks
patch -p1 <$CWD/patches/symlinks_instead_of_hardlinks.diff

# Copy already present source tarballs
cp $CWD/ipxe-git-$IPXE.tar.gz tools/firmware/etherboot/_ipxe.tar.gz
(
  # Seabios
  cd tools/firmware
  tar -xf $CWD/seabios-$SEABIOS.tar.?z || tar -xf $CWD/seabios-rel-$SEABIOS.tar.?z
  mv seabios-$SEABIOS seabios-dir-remote || mv seabios-rel-$SEABIOS seabios-dir-remote
  ln -s seabios-dir-remote seabios-dir
  make -C seabios-dir defconfig
  # OVMF
  tar -xf $CWD/xen-ovmf-$OVMF.tar.bz2
  mv xen-ovmf-$OVMF ovmf-dir-remote
  ln -s ovmf-dir-remote ovmf-dir
  cp ovmf-makefile ovmf-dir/Makefile
)
cp $CWD/{lwip,zlib,newlib,pciutils,grub,gmp,tpm_emulator}-*.tar.?z* \
  $CWD/polarssl-*.tgz stubdom

# Prevent leaks during the build
patch -p1 <$CWD/patches/stubdom_zlib_disable_man_install.diff

# Fix glibc-2.27 build
if [ "$(ldd --version | awk '{print $NF; exit}')" = "2.27" ]; then
  ( cd tools/qemu-xen && patch -p1 <$CWD/patches/glibc-memfd_fix_configure_test.patch )
fi

# Fix ovmf firmware build
( cd tools/firmware/ovmf-dir-remote && \
  patch -p1 <$CWD/patches/0001-BaseTools-fix-ucs-2-lookup-on-python-3.9.patch
  patch -p1 <$CWD/patches/0002-BaseTools-Work-around-array.array.tostring-removal-i.patch
  patch -p1 <$CWD/patches/0003-BaseTools-replace-deprecated-fromstring-and-tostring.diff
  patch -p1 <$CWD/patches/edk2-ovmf-202105-werror.patch
)

# Fix binutils-2.36 build
if [ "$(objcopy --version | awk '{print $NF; exit}' | cut -d- -f1)" = "2.36" ]; then
  patch -p1 <$CWD/patches/qemu-xen-no-pie.diff
fi

patch -p1 <$CWD/patches/tools-ipxe-update-for-fixing-build-with-GCC11.diff

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 \
  $CONF_XEN \
  --with-extra-qemuu-configure-args="$CONF_QEMUU" \
  --build=$ARCH-slackware-linux

make install-xen \
  docdir=/usr/doc/$PRGNAM-$VERSION \
  DOCDIR=/usr/doc/$PRGNAM-$VERSION \
  mandir=/usr/man \
  MANDIR=/usr/man \
  DESTDIR=$PKG

echo CONFIG_GOLANG=n >> xen/.config
echo CONFIG_GOLANG=n > tools/.config

make install-tools \
  docdir=/usr/doc/$PRGNAM-$VERSION \
  DOCDIR=/usr/doc/$PRGNAM-$VERSION \
  mandir=/usr/man \
  MANDIR=/usr/man \
  DESTDIR=$PKG

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

make 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:-no}" != "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
cat $CWD/slack-desc > $PKG/install/slack-desc
cat $CWD/doinst.sh > $PKG/install/doinst.sh

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