#!/bin/bash

# Slackware build script for Exim

# Copyright 2012-2021 Thomas Morper, Nürnberg, Germany
# 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=exim
VERSION=${VERSION:-4.94.2}
BUILD=${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

# Check if the exim user and group exist. If not, then bail.
if [ -z "$(getent group exim)" -o -z "$(getent passwd exim)" ]; then
  echo "  You must have an 'exim' user and group to run this script."
  echo "    # groupadd -g 222 exim"
  echo "    # useradd -d /var/spool/exim -g exim -s /bin/false -u 222 exim"
  exit 1
fi

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 {} \;

# This is our custom config for an all-purpose Exim daemon.
# See README.SBo for info on how to enable the database lookups.
cat $CWD/exim.Makefile > Local/Makefile

# Add our SLKCFLAGS to the custom Makefile
echo "CFLAGS += $SLKCFLAGS" >> Local/Makefile

# Use a stock config for the Exim Monitor (not built by default).
cat exim_monitor/EDITME > Local/eximon.conf

# Build and install.
FULLECHO="" LIBDIRSUFFIX=$LIBDIRSUFFIX DESTDIR=$PKG make -e install

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

# Replace the 'exim' symlink with the 'exim' binary.
mv $(readlink -f $PKG/usr/sbin/exim) $PKG/usr/sbin/exim

# Additional symlinks provide compatibility with sendmail.
mkdir -p $PKG/usr/lib     # no LIBDIRSUFFIX here!
( cd $PKG/usr/lib;  ln -s /usr/sbin/exim sendmail )
( cd $PKG/usr/sbin; ln -s /usr/sbin/exim sendmail )

# Install accompanying scripts and configs.
mkdir -p $PKG/etc/{cron.daily,logrotate.d,rc.d}
install -m 0644 $CWD/contrib/rc.exim        $PKG/etc/rc.d/rc.exim.new
install -m 0755 $CWD/contrib/exim.cron      $PKG/etc/cron.daily/exim.new
install -m 0644 $CWD/contrib/exim.logrotate $PKG/etc/logrotate.d/exim.new

# Prepare log- and spool-directories.
mkdir -p $PKG/var/log/exim
mkdir -p -m 0750 $PKG/var/spool/exim/
mkdir -p -m 0750 $PKG/var/spool/exim/{db,input,msglog}
chown -R exim.exim $PKG/var/{log,spool}/exim

mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
cp -a \
  ABOUT ACKNOWLEDGMENTS CHANGES CONTRIBUTING LICENCE* NOTICE README* doc \
  $PKG/usr/doc/$PRGNAM-$VERSION
cat $CWD/README.SBo > $PKG/usr/doc/$PRGNAM-$VERSION/README.SBo
cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild

# Don't use the default config - make it part of the documentation.
mv $PKG/etc/exim/exim.conf $PKG/usr/doc/$PRGNAM-$VERSION/example-exim.conf
mv $PKG/etc/exim/aliases $PKG/usr/doc/$PRGNAM-$VERSION/example-aliases

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

# Adjust version info for release candidates.
VERSION=${VERSION/-/_}

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