#!/bin/bash

# Copyright 2015, 2016, 2017, 2018, 2019, 2020  Eric Hameleers, Eindhoven, NL
# Copyright 2024  Patrick J. Volkerding, Sebeka, Minnesota, USA
# 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)

PKGNAM=sddm
VERSION=${VERSION:-$(echo $PKGNAM-*.tar.?z | rev | cut -f 3- -d . | cut -f 1 -d - | rev)}
BUILD=${BUILD:-1}

# 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

# 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 "${PRINT_PACKAGE_NAME}" ]; then
  echo "$PKGNAM-$VERSION-$ARCH-$BUILD.txz"
  exit 0
fi

NUMJOBS=${NUMJOBS:-" -j $(expr $(nproc) + 1) "}

if [ "$ARCH" = "i586" ]; then
  SLKCFLAGS="-O2 -march=i586 -mtune=i686"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "i686" ]; then
  SLKCFLAGS="-O2 -march=i686"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "s390" ]; then
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="-O2 -fPIC"
  LIBDIRSUFFIX="64"
elif [ "$ARCH" = "armv7hl" ]; then
  SLKCFLAGS="-O3 -march=armv7-a -mfpu=vfpv3-d16"
  LIBDIRSUFFIX=""
else
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
fi

TMP=${TMP:-/tmp}
PKG=$TMP/package-$PKGNAM

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

cd $TMP
rm -rf $PKGNAM-$VERSION
tar xvf $CWD/$PKGNAM-$VERSION.tar.?z || exit 1
cd $PKGNAM-$VERSION || exit 1

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 {} \+

# Don't source $HOME/.xession in SDDM's Xsession script. It may cause the
# wrong session type to launch, or run a second copy of dbus-run-session which
# will break logout:
cat $CWD/sddm.do.not.source.HOME.xsession.diff | patch -p1 --verbose || exit 1

# List Wayland sessions after X11 sessions since Wayland is more experimental:
cat $CWD/sddm.list.X11.sessions.before.Wayland.Sessions.diff | patch -p1 --verbose || exit 1

# Configure, build, and install:
mkdir -p cmake-build
cd cmake-build
  cmake \
    -DCMAKE_BUILD_TYPE=Release \
    -DCMAKE_C_FLAGS:STRING="$SLKCFLAGS" \
    -DCMAKE_C_FLAGS_RELEASE:STRING="$SLKCFLAGS" \
    -DCMAKE_CXX_FLAGS:STRING="$SLKCFLAGS" \
    -DCMAKE_CXX_FLAGS_RELEASE:STRING="$SLKCFLAGS" \
    -DCMAKE_INSTALL_PREFIX=/usr \
    -DCMAKE_INSTALL_MANDIR=/usr/man \
    -DLIB_SUFFIX=${LIBDIRSUFFIX} \
    -DBUILD_MAN_PAGES:BOOL=TRUE \
    -DDBUS_CONFIG_FILENAME="org.freedesktop.sddm.conf" \
    -DUSE_QT5:BOOL=TRUE \
    -DENABLE_JOURNALD:BOOL=FALSE \
    -DENABLE_PAM:BOOL=ON \
    -DNO_SYSTEMD:BOOL=TRUE \
    -DUSE_ELOGIND:BOOL=TRUE \
    .. || exit 1
  make $NUMJOBS || make || exit 1
  make install DESTDIR=$PKG || exit 1
cd ..

# Replace systemd-centric files with ours:
rm -f $PKG/etc/pam.d/sddm*
for FILE in sddm sddm-autologin sddm-greeter ; do
  install -Dm644 $CWD/pam.d/$FILE $PKG/etc/pam.d/${FILE}.new
done

# Create the SDDM home directory:
mkdir -p $PKG/var/lib/sddm
chmod 755 $PKG/var/lib/sddm
chown sddm:sddm $PKG/var/lib/sddm

# D-Bus configs should be under /usr, not /etc:
mkdir -p $PKG/usr/share/dbus-1/system.d
mv $PKG/etc/dbus-1/system.d/* $PKG/usr/share/dbus-1/system.d
rmdir --parents $PKG/etc/dbus-1/system.d

# Remove the sddm.conf file because we will generate our own in doinst.sh:
rm -f $PKG/etc/sddm.conf

# Generate the default sddm.conf:
$PKG/usr/bin/sddm --example-config > $PKG/etc/sddm.conf

# Set the KDE5 theme 'breeze' as default (integrates better with Plasma 5):
sed -i -e "/\[Theme\]/,/^\[/s/^Current.*/Current=breeze/" $PKG/etc/sddm.conf

# Move the default config file to .new:
mv $PKG/etc/sddm.conf $PKG/etc/sddm.conf.new

# Make sure that Plasma and SDDM work on older GPUs,
# by forcing Qt5 to use software GL rendering:
cat << "EOF" >> $PKG/usr/share/sddm/scripts/Xsetup
# Make sure that Plasma and SDDM work on older GPUs by forcing Qt5 to use
# software GL rendering if the OpenGL version is not new enough:
OPENGL_VERSION=$(LANG=C glxinfo |grep '^OpenGL version string: ' |head -n 1 |sed -e 's/^OpenGL version string: \([0-9]\).*$/\1/g')
if [ "$OPENGL_VERSION" -lt 2 ]; then
  QT_XCB_FORCE_SOFTWARE_OPENGL=1
  export QT_XCB_FORCE_SOFTWARE_OPENGL
fi
EOF

# Add a wrapper for the sddm binary, to enable a custom environment:
mv $PKG/usr/bin/sddm $PKG/usr/bin/sddm.bin
cat <<"EOT" > $PKG/usr/bin/sddm
#!/bin/sh
# Customized environment (LANG definition):
if [ -f /etc/default/sddm ]; then
  . /etc/default/sddm
fi

# Ensure non-world readable permissions on /var/log/sddm.log:
touch /var/log/sddm.log
chmod 640 /var/log/sddm.log

# Add a timestamp:
date >> /var/log/sddm.log

# Redirect stdout/stderr to /dev/null to avoid polluting a virtual
# console with duplicate log messages:
exec /usr/bin/sddm.bin "$@" 1> /dev/null 2> /dev/null
EOT
chmod 0755 $PKG/usr/bin/sddm

# Let's also add an example customization (localization of the UI):
mkdir -p  $PKG/etc/default
echo ". /etc/profile.d/lang.sh" >  $PKG/etc/default/sddm.new

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

# Compress manual pages:
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

# Add a documentation directory:
mkdir -p $PKG/usr/doc/${PKGNAM}-$VERSION
cp -a \
  CONTRIBUTORS* ChangeLog* INSTALL* LICENSE* README* docs/* \
  $PKG/usr/doc/${PKGNAM}-$VERSION

# If there's a ChangeLog, installing at least part of the recent history
# is useful, but don't let it get totally out of control:
if [ -r ChangeLog ]; then
  DOCSDIR=$(echo $PKG/usr/doc/${PKGNAM}-$VERSION)
  cat ChangeLog | head -n 1000 > $DOCSDIR/ChangeLog
  touch -r ChangeLog $DOCSDIR/ChangeLog
fi

mkdir -p $PKG/install
zcat $CWD/doinst.sh.gz > $PKG/install/doinst.sh
cat $CWD/slack-desc > $PKG/install/slack-desc

cd $PKG
/sbin/makepkg -l y -c n $TMP/$PKGNAM-$VERSION-$ARCH-$BUILD.txz