#!/bin/bash

set -e

detect_quilt() {
  if which quilt 1>/dev/null; then
    QUILT_PRESENT=1
    export QUILT_PATCHES=debian/patches
  fi
}

ensure_crashpad_can_fetch_line_number_by_address() {
  if [ ! -f /etc/centos-release ]; then
    export LDFLAGS="$LDFLAGS -no-pie"
  fi
}


fail_on_gcc_12() {
  if [[ -n "$CC" && -n "$CXX" ]]; then
    return;
  fi

  if gcc --version | head -1 | grep -q 12; then
    cat >&2 <<EOF

Error: gcc 12 detected. It has a bug causing the build to fall because of a
-Warray-bounds bug. Please use gcc 11 in the build Dockerfile:
ENV CC=gcc-11
ENV CXX=g++-11
RUN <install gcc 11>
EOF
  exit 1
  fi
}

# For build-dep to work, the apt sources need to have the source server
#sudo apt-get build-dep xorg-server

#sudo apt-get install cmake git libjpeg-dev libgnutls-dev

# Gcc12 builds fail due to bug
#fail_on_gcc_12

# Ubuntu applies a million patches, but here we use upstream to simplify matters
cd /tmp
# default to the version of x in Ubuntu 18.04, otherwise caller will need to specify
XORG_VER=${XORG_VER:-"1.19.6"}
XORG_PATCH=$(echo "$XORG_VER" | grep -Po '^\d.\d+' | sed 's#\.##')
wget --no-check-certificate https://www.x.org/archive/individual/xserver/xorg-server-${XORG_VER}.tar.gz

#git clone https://kasmweb@bitbucket.org/kasmtech/kasmvnc.git
#cd kasmvnc
#git checkout dynjpeg
cd /src

# We only want the server, so FLTK and manual tests aren't useful.
# Alternatively, install fltk 1.3 and its dev packages.
sed -i -e '/find_package(FLTK/s@^@#@' \
	-e '/add_subdirectory(tests/s@^@#@' \
	CMakeLists.txt

cmake -D CMAKE_BUILD_TYPE=RelWithDebInfo . -DBUILD_VIEWER:BOOL=OFF \
  -DENABLE_GNUTLS:BOOL=OFF
make -j5

tar -C unix/xserver -xf /tmp/xorg-server-${XORG_VER}.tar.gz --strip-components=1

cd unix/xserver
# Apply patches
patch -Np1 -i ../xserver${XORG_PATCH}.patch
case "$XORG_VER" in
  1.20.*)
      patch -s -p0 < ../CVE-2022-2320-v1.20.patch
      if [ -f ../xserver120.7.patch ]; then
        patch -Np1 -i ../xserver120.7.patch
      fi ;;
  1.19.*)
      patch -s -p0 < ../CVE-2022-2320-v1.19.patch
      ;;
esac

autoreconf -i
# Configuring Xorg is long and has many distro-specific paths.
# The distro paths start after prefix and end with the font path,
# everything after that is based on BUILDING.txt to remove unneeded
# components.
ensure_crashpad_can_fetch_line_number_by_address
# Centos7 is too old for dri3
if [ ! "${KASMVNC_BUILD_OS}" == "centos" ]; then
  CONFIG_OPTIONS="--enable-dri3"
fi
# remove gl check for opensuse
if [ "${KASMVNC_BUILD_OS}" == "opensuse" ] || ([ "${KASMVNC_BUILD_OS}" == "oracle" ] && [ "${KASMVNC_BUILD_OS_CODENAME}" == 9 ]); then
  sed -i 's/LIBGL="gl >= 7.1.0"/LIBGL="gl >= 1.1"/g' configure
fi

# build X11
./configure \
    --disable-config-hal \
    --disable-config-udev \
    --disable-dmx \
    --disable-dri \
    --disable-dri2 \
    --disable-kdrive \
    --disable-static \
    --disable-xephyr \
    --disable-xinerama \
    --disable-xnest \
    --disable-xorg \
    --disable-xvfb \
    --disable-xwayland \
    --disable-xwin \
    --enable-glx \
    --prefix=/opt/kasmweb \
    --with-default-font-path="/usr/share/fonts/X11/misc,/usr/share/fonts/X11/cyrillic,/usr/share/fonts/X11/100dpi/:unscaled,/usr/share/fonts/X11/75dpi/:unscaled,/usr/share/fonts/X11/Type1,/usr/share/fonts/X11/100dpi,/usr/share/fonts/X11/75dpi,built-ins" \
    --without-dtrace \
    --with-sha1=libcrypto \
    --with-xkb-bin-directory=/usr/bin \
    --with-xkb-output=/var/lib/xkb \
    --with-xkb-path=/usr/share/X11/xkb ${CONFIG_OPTIONS}

# remove array bounds errors for new versions of GCC
find . -name "Makefile" -exec sed -i 's/-Werror=array-bounds//g' {} \;
make -j5

# modifications for the servertarball
cd /src
mkdir -p xorg.build/bin
cd xorg.build/bin/
ln -s /src/unix/xserver/hw/vnc/Xvnc Xvnc
cd ..
mkdir -p man/man1
touch man/man1/Xserver.1
cp /src/unix/xserver/hw/vnc/Xvnc.man man/man1/Xvnc.1
mkdir lib
cd lib
if [ -d /usr/lib/x86_64-linux-gnu/dri ]; then
  ln -s /usr/lib/x86_64-linux-gnu/dri dri
elif [ -d /usr/lib/aarch64-linux-gnu/dri ]; then
  ln -s /usr/lib/aarch64-linux-gnu/dri dri
elif [ -d /usr/lib/xorg/modules/dri ]; then
  ln -s /usr/lib/xorg/modules/dri dri
else
  ln -s /usr/lib64/dri dri
fi
cd /src

detect_quilt
if [ -n "$QUILT_PRESENT" ]; then
  quilt push -a
  echo 'Patches applied!'
fi

make servertarball

cp kasmvnc*.tar.gz /build/kasmvnc.${KASMVNC_BUILD_OS}_${KASMVNC_BUILD_OS_CODENAME}.tar.gz
if [ "$BUILD_TAG" = "+libjpeg-turbo_latest" ]; then
	mkdir -p /build/${KASMVNC_BUILD_OS_CODENAME}/
	cp /libjpeg-turbo/libjpeg*.deb /build/${KASMVNC_BUILD_OS_CODENAME}/
fi