#!/bin/bash

# Copyright 2008, 2009, 2010, 2012, 2013, 2014, 2016, 2018, 2019, 2020, 2021, 2022, 2023  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=xscreensaver
VERSION=${VERSION:-$(echo xscreensaver-*.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) export ARCH=i586 ;;
    arm*) export ARCH=arm ;;
    # Unless $ARCH is already set, use uname -m for all other archs:
       *) export ARCH=$( 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 "${PRINT_PACKAGE_NAME}" ]; then
  echo "$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" = "s390" ]; then
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
elif [ "$ARCH" = "x86_64" ]; then
  SLKCFLAGS="-O2 -fPIC"
  LIBDIRSUFFIX="64"
else
  SLKCFLAGS="-O2"
  LIBDIRSUFFIX=""
fi

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

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

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

if [ -L /lib${LIBDIRSUFFIX}/libpam.so.? ]; then
  USE_PAM="--with-pam"
  unset USE_SHADOW
else
  ## NOTE: The patch below (and support for setgid shadow) is broken and
  ## unmaintained. But the broken bits will be left as hints for anyone
  ## down the line who might care.
  # Allow xscreensaver to work setgid shadow.  I'd rather avoid requiring
  # setuid root on this if at all possible...
  #zcat $CWD/xscreensaver.setuid.diff.gz | patch -p1 --verbose --backup --suffix=.orig || exit 1
  unset USE_PAM
  USE_SHADOW="--with-shadow"
fi

# Add support for the electricsheep distributed screensaver:
zcat $CWD/xscreensaver.electricsheep.diff.gz | patch -p1 --verbose --backup --suffix=.orig || exit 1

# Remove a feature that pops up a nag screen claiming the version is old
# after one year.  Just don't send in bug reports on an old version, OK folks?
# I hate to swim against upstream, but with all respect this feature is not
# helpful to distributions.
zcat $CWD/xscreensaver.no.expiration.date.diff.gz | patch -p1 --verbose --backup --suffix=.orig || 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 {} \+

xml_config=/usr/bin/xml-config xml2_config=/usr/bin/xml2-config \
CFLAGS="$SLKCFLAGS" \
CXXFLAGS="$SLKCFLAGS" \
./configure \
  --prefix=/usr \
  --libdir=/usr/lib${LIBDIRSUFFIX} \
  --mandir=/usr/man \
  --with-app-defaults=/etc/X11/app-defaults \
  --with-text-file=/usr/doc/netdate/COPYRIGHT \
  $USE_SHADOW \
  $USE_PAM \
  --without-kerberos \
  --with-jpeg \
  --with-gl \
  --build=$ARCH-slackware-linux || exit 1

# Build:
make $NUMJOBS || make || exit 1
make install_prefix=$PKG install-strip || exit 1

if [ -z $USE_PAM ]; then
  # Needed for password unlock:
  chown root:shadow $PKG/usr/bin/xscreensaver
  chmod 2751 $PKG/usr/bin/xscreensaver
else
  ## Commenting out the chmod below, since as of v6.00 this binary is no longer
  ## made setuid at installation. But if that changes, we'll go along with it
  ## since jwz says it may be required to prevent OOM killer abuse from
  ## unlocking the screen.
  # No special perms needed with PAM:
  #chmod 755 $PKG/usr/bin/xscreensaver
  mkdir -p $PKG/etc/pam.d
  cat $CWD/xscreensaver.pam > $PKG/etc/pam.d/xscreensaver.new
  mkdir -p $PKG/install
  zcat $CWD/doinst.sh.gz > $PKG/install/doinst.sh
fi

# This is needed for the menus:
mkdir -p $PKG/usr/share/pixmaps
mkdir -p $PKG/etc
mkdir -p $PKG/usr/doc/xscreensaver-$VERSION
cp -a \
  README* \
  $PKG/usr/doc/xscreensaver-$VERSION

# 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 $( find . -type l -maxdepth 1 | grep -v '\.gz$') ; do
          ln -s $( readlink $eachpage ).gz $eachpage.gz
          rm $eachpage
        done
        gzip -9 *.?
      )
    done
  )
fi

# Insert an older version of xscreensaver-getimage-file to avoid depending
# on libwww-perl.  Maybe we'll eventually add this, but bundling 14 perl
# modules is a lot of maintainance just to get slidescreen working again.
# This restores the functionality that we had before without all that.
cat $CWD/xscreensaver-getimage-file-5.14 > $PKG/usr/bin/xscreensaver-getimage-file

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

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