#!/bin/bash

# Slackware build script for lightdm

# Copyright 2025 Isaac Yu <isaacyu@protonmail.com>
# 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.

# This SlackBuild is derived from the following sources:
# Frank Honolka:
# https://gitlab.com/slackernetuk/slackware-xfce-classic/-/tree/master/lightdm
# Slint (SLKBUILD originally written by George Vlahavas):
# https://slackware.uk/slint/x86_64/slint-15.0/source/lightdm/

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

PRGNAM=lightdm
VERSION=${VERSION:-1.32.0}
BUILD=${BUILD:-1}
TAG=${TAG:-_SBo}
PKGTYPE=${PKGTYPE:-tgz}

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

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 [ "$ARCH" = "i586" ]; then
  SLKCFLAGS="-O2 -march=i586 -mtune=i686"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "i686" ]; then
  SLKCFLAGS="-O2 -march=i686 -mtune=i686"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="-O2 -fPIC"
  LIBDIRSUFFIX="64"
else
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
fi

# This SlackBuild requires a "lightdm" user and group, with UID 380 and GID 380.
# See http://slackbuilds.org/uid_gid.txt for recommended UID/GIDs
bailout() {
  echo "  You must have lightdm user and group:"
  echo "    # groupadd -g 380 lightdm"
  echo "    # useradd -d /var/lib/lightdm -s /bin/false -u 380 -g 380 lightdm"
  exit 1
}

# Bail if user isn't valid on your system
if ! getent group lightdm 1>/dev/null 2>/dev/null ; then
  bailout
elif ! getent passwd lightdm 1>/dev/null 2>/dev/null ; then
  bailout
fi

set -e

rm -rf $PKG
mkdir -p $TMP $PKG $OUTPUT
cd $TMP
rm -rf $PRGNAM-$VERSION
tar xvf $CWD/$PRGNAM-$VERSION.tar.xz
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 -p1 < $CWD/default-config.patch
sed -i s/systemd/elogind/ data/pam/*

CFLAGS="$SLKCFLAGS" \
CXXFLAGS="$SLKCFLAGS" \
./configure \
  --prefix=/usr \
  --libdir=/usr/lib${LIBDIRSUFFIX} \
  --libexecdir=/usr/lib${LIBDIRSUFFIX}/lightdm \
  --localstatedir=/var \
  --sbindir=/usr/bin \
  --sysconfdir=/etc \
  --disable-static \
  --disable-tests \
  --with-greeter-user=lightdm  \
  --with-greeter-session=lightdm-gtk-greeter \
  --disable-liblightdm-qt5 \
  --mandir=/usr/man \
  --docdir=/usr/doc/$PRGNAM-$VERSION \
  --build=$ARCH-slackware-linux

make
make install DESTDIR=$PKG

cp tests/src/lightdm-session $PKG/usr/bin
sed -i '1 s/sh/bash --login/' $PKG/usr/bin/lightdm-session
rm -rf $PKG/etc/init

install -v -dm755 -o lightdm -g lightdm $PKG/var/lib/lightdm
install -v -dm755 -o lightdm -g lightdm $PKG/var/lib/lightdm-data
install -v -dm755 -o lightdm -g lightdm $PKG/var/cache/lightdm
install -v -dm770 -o lightdm -g lightdm $PKG/var/log/lightdm

# Remove .la file
rm $PKG/usr/lib${LIBDIRSUFFIX}/liblightdm-gobject-1.la

# Remove apparmor profiles - they only work with Ubuntu's apparmor package
# Refer to bug #494426 for more details:
# https://bugs.gentoo.org/494426
rm -rf $PKG/etc/apparmor.d

# PAM
cp $CWD/pam.d/* $PKG/etc/pam.d/

# If FSCRYPT=yes is passed, add these PAM rules (to automatically unlock password-protected directories upon login)
if [ ${FSCRYPT:no} = yes ]; then
  sed -i '/-auth     optional pam_kwallet5.so/a-auth     optional pam_fscrypt.so' $PKG/etc/pam.d/lightdm
  sed -i '/-session  optional pam_ck_connector.so nox11/a-session  optional pam_fscrypt.so' $PKG/etc/pam.d/lightdm
fi

# PolicyKit
mkdir -p -m700 $PKG/usr/share/polkit-1/rules.d
chown polkitd $PKG/usr/share/polkit-1/rules.d
install -m 644 $CWD/42-lightdm.rules $PKG/usr/share/polkit-1/rules.d/42-lightdm.rules

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

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

mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
cp -a COPYING.GPL3 COPYING.LGPL2 COPYING.LGPL3 NEWS README.md $PKG/usr/doc/$PRGNAM-$VERSION
cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild

mkdir -p $PKG/install
cat $CWD/slack-desc > $PKG/install/slack-desc

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