#!/bin/bash

# Slackware build script for Weston

# Copyright 2019-2020 Logan Rathbone <poprocks@gmail.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.

PRGNAM=weston
VERSION=${VERSION:-9.0.0}
BUILD=${BUILD:-1}
TAG=${TAG:-_SBo}

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

CWD=$(pwd)
TMP=${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

set -e

rm -rf $PKG
mkdir -p $TMP $PKG $OUTPUT
cd $TMP
rm -rf $PRGNAM-$VERSION
tar xvf $CWD/$PRGNAM-$VERSION.tar.gz
cd $PRGNAM-$VERSION

# Make sure ownerships and permissions are sane:
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 {} \;

# "./configure"
CFLAGS="$SLKCFLAGS" \
CXXFLAGS="$SLKCFLAGS" \
meson build/ \
  --prefix=/usr \
  --mandir=man \
  --libdir=lib${LIBDIRSUFFIX} \
  -Dlauncher-logind=false \
  -Dbackend-rdp=false \
  -Dsystemd=false \
  -Dpipewire=false \
  -Dsimple-dmabuf-drm=auto \
  -Dcolor-management-colord=${USE_COLORD:-false}

# "make"
CFLAGS="$SLKCFLAGS" \
CXXFLAGS="$SLKCFLAGS" \
ninja -C build

# "make install"
DESTDIR=$PKG ninja -C build/ install

# strip
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

# Install /etc/profile.d scripts.
mkdir -p $PKG/etc/profile.d/

cat << 'EOF' > $PKG/etc/profile.d/${PRGNAM}.sh.new
#!/bin/sh
if test -z "${XDG_RUNTIME_DIR}"; then
    export XDG_RUNTIME_DIR=/tmp/${UID}-runtime-dir
    if ! test -d "${XDG_RUNTIME_DIR}"; then
        mkdir "${XDG_RUNTIME_DIR}"
        chmod 0700 "${XDG_RUNTIME_DIR}"
    fi
fi
EOF

cat << 'EOF' > $PKG/etc/profile.d/${PRGNAM}.csh.new
#!/bin/csh
if ( ! $?XDG_RUNTIME_DIR ) then
    setenv XDG_RUNTIME_DIR /tmp/${uid}-runtime-dir
    if ( ! -d $XDG_RUNTIME_DIR ) then
        mkdir "${XDG_RUNTIME_DIR}"
        chmod 0700 "${XDG_RUNTIME_DIR}"
    endif
endif
EOF

chmod 644 $PKG/etc/profile.d/${PRGNAM}*.new

# setup doinst script...

mkdir -p $PKG/install

cat << 'EOF' > $PKG/install/doinst.sh
config() {
  NEW="$1"
  OLD="$(dirname $NEW)/$(basename $NEW .new)"
  # If there's no config file by that name, mv it over:
  if [ ! -r $OLD ]; then
    mv $NEW $OLD
  elif [ "$(cat $OLD | md5sum)" = "$(cat $NEW | md5sum)" ]; then
    # toss the redundant copy
    rm $NEW
  fi
  # Otherwise, we leave the .new copy for the admin to consider...
}

preserve_perms() {
  NEW="$1"
  OLD="$(dirname $NEW)/$(basename $NEW .new)"
  if [ -e $OLD ]; then
    cp -a $OLD ${NEW}.incoming
    cat $NEW > ${NEW}.incoming
    mv ${NEW}.incoming $NEW
  fi

  config $NEW
}

EOF

# config-ify the profile.d stuff

# FIXME - I tried many things to try to creatively preserve the perms
# of weston-launch as well (ie, in case someone suid's it and wants to
# keep it that way upon  upgrade), but this is really difficult if not
# impossible to implement with Slackware's packaging system without
# allowing for stray binaries (which would have been setuid by the
# user) lingering around, which I'd really rather avoid, for safety.
#
# At this juncture, users will simply have to manually setuid-root the
# binary upon each upgrade.

cat << EOF >> $PKG/install/doinst.sh
preserve_perms etc/profile.d/${PRGNAM}.sh.new
preserve_perms etc/profile.d/${PRGNAM}.csh.new

EOF

# Install some documentation and finish up.
mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
cp -a CONTRIBUTING.md COPYING DCO-1.1.txt README.md notes.txt $PKG/usr/doc/$PRGNAM-$VERSION
cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild
cat $CWD/README.SBo > $PKG/usr/doc/$PRGNAM-$VERSION/README.SBo

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

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