#!/bin/sh
# Copyright 2016  Patrick J. Volkerding, Sebeka, MN, USA
# Copyright 2016, 2017, 2020  Eric Hameleers, Eindhoven, NL
# All rights reserved.
#
#   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.
#
#   THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 AUTHORS AND COPYRIGHT HOLDERS AND THEIR
#   CONTRIBUTORS 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.
# -----------------------------------------------------------------------------

# Thanks to Widya Walesa for script improvements.

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

PKGNAM=elogind
VERSION=${VERSION:-243.7}
BUILD=${BUILD:-1}

# Automatically determine the architecture we're building on:
MARCH=$( uname -m )
if [ -z "$ARCH" ]; then
  case "$MARCH" in
    i?86)    export ARCH=i486 ;;
    arm*) readelf /usr/bin/file -A | egrep -q "Tag_CPU.*[4,5]" && ARCH=arm || ARCH=armv7hl ;;
    # Unless $ARCH is already set, use uname -m for all other archs:
    *)       export ARCH=$MARCH ;;
  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 "${PRINT_PACKAGE_NAME}" ]; then
  echo "$PKGNAM-$VERSION-$ARCH-$BUILD.txz"
  exit 0
fi

# Set CFLAGS/CXXFLAGS and LIBDIRSUFFIX:
if [ "$ARCH" = "i486" ]; then
  SLKCFLAGS="-O2 -march=i486 -mtune=i686"
  LIBDIRSUFFIX=""
elif [ "$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=""
elif [ "$ARCH" = "arm" ]; then
  SLKCFLAGS="-O2 -march=armv5te"
  LIBDIRSUFFIX=""
else
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
fi

case "$ARCH" in
    arm*) TARGET=$ARCH-slackware-linux-gnueabi ;;
    *)    TARGET=$ARCH-slackware-linux ;;
esac

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.gz || exit 1
cd $PKGNAM-$VERSION || exit 1

# Our nobody user has UIDNumber 99, not 65534:
sed -e "s/65534/99/g" -i $(grep -lr 65534 .)

# Launch elogind when called via DBus and make sure its rundir exists
# (in Slackware, /run is mounted as a tmpfs):
sed -i src/login/org.freedesktop.login1.service.in \
    -e "s,/bin/false,/lib${LIBDIRSUFFIX}/elogind,"

# Merge a pull request for an upstream fix:
cat $CWD/patches/elogind-polkit.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 {} \;

# Thanks to Widya Walesa:
# Slackware still using cgroup v1 or legacy mode. Check the outcome of: 
# [ $(stat -fc %T /sys/fs/cgroup/) = "cgroup2fs" ] && echo "unified" \
#   || ( [ -e /sys/fs/cgroup/unified/ ] && echo "hybrid" || echo "legacy")

# Configure:
export CFLAGS="$SLKCFLAGS"
export CXXFLAGS="$SLKCFLAGS"
meson \
  --buildtype release \
  --prefix /usr \
  --libdir /usr/lib${LIBDIRSUFFIX} \
  -Drootlibdir="/lib${LIBDIRSUFFIX}" \
  -Drootlibexecdir="/lib${LIBDIRSUFFIX}/elogind" \
  -Dudevrulesdir="/etc/udev/rules.d" \
  -Ddocdir="/usr/doc/$PKGNAM-$VERSION" \
  -Dhtmldir="/usr/doc/$PKGNAM-$VERSION/html" \
  -Dmandir="/usr/man" \
  -Dman=true \
  -Dhtml=false \
  -Dbashcompletiondir="/usr/share/bash-completion/completions" \
  -Dnobody-group=nogroup \
  -Dpam=true \
  -Dpamlibdir="/lib${LIBDIRSUFFIX}/security" \
  -Dpamconfdir="/etc/pam.d" \
  -Dacl=true \
  -Dsmack=false \
  -Dutmp=true \
  -Ddefault-hierarchy=legacy \
  -Dcgroup-controller=elogind \
  -Dhalt-path=/sbin/halt \
  -Dpoweroff-path=/sbin/poweroff \
  -Dreboot-path=/sbin/reboot \
  -Ddefault-kill-user-processes=false \
  build_elogind \
  || exit 1

# Build and install:
ninja -C build_elogind || exit 1
DESTDIR=$PKG ninja install -C build_elogind || exit 1

# Create symlinks for elogind binaries to /usr/bin/:
mkdir -p $PKG/usr/bin
ln -sf /bin/elogind-inhibit $PKG/usr/bin/elogind-inhibit
ln -sf /bin/loginctl $PKG/usr/bin/loginctl

# Make sure we do not overwrite the user's customizations:
mv -i $PKG/etc/elogind/logind.conf{,.new}

# Strip binaries:
find $PKG -print0 | xargs -0 file | grep -e "executable" -e "shared object" | \
  grep ELF | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null || true

# Compress and link manpages, if any:
if [ -d $PKG/usr/man ]; then
  ( cd $PKG/usr/man
    for manpagedir in $(find . -type d -name "man*") ; do
      ( cd $manpagedir
        for eachpage in $( find . -type l -maxdepth 1) ; do
          ln -s $( readlink $eachpage ).gz $eachpage.gz
          rm $eachpage
        done
        gzip -9 *.?
      )
    done
  )
fi

# Add a rc script; Slackware does not yet support this out of the box.
# Preferably the rc code will get added right before starting rc.messagebus:
mkdir -p $PKG/etc/rc.d
cat $CWD/rc.elogind \
  | sed -e "s/@LIBDIRSUFFIX@/${LIBDIRSUFFIX}/g" \
  > $PKG/etc/rc.d/rc.elogind.new
chmod 755 $PKG/etc/rc.d/rc.elogind.new

# Add documentation:
mkdir -p $PKG/usr/doc/$PKGNAM-$VERSION
cp -a \
  LICENSE* README* TODO \
  $PKG/usr/doc/$PKGNAM-$VERSION

# Add a description and post-install script:
mkdir -p $PKG/install
cat $CWD/slack-desc > $PKG/install/slack-desc
cat $CWD/doinst.sh > $PKG/install/doinst.sh

# Create the package:
cd $PKG
/sbin/makepkg -l y -c n $TMP/$PKGNAM-$VERSION-$ARCH-$BUILD.txz