#!/bin/bash

# Slackware build script for Apache Kafka

# Copyright 2016 Andre Barboza - Belo Horizonte Brazil
# 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=kafka
VERSION=${VERSION:-0.11.0.0}
SCALA_VERSION=2.12
BUILD=${BUILD:-1}
TAG=${TAG:-_SBo}

KAFKA_USER=${KAFKA_USER:-kafka}
KAFKA_UID=${KAFKA_UID:-323}
KAFKA_GROUP=${KAFKA_GROUP:-kafka}
KAFKA_GID=${KAFKA_GID:-323}

if [ -z "$ARCH" ]; then
  case "$( uname -m )" in
    i?86) ARCH=i486 ;;
    arm*) ARCH=arm ;;
       *) ARCH=$( uname -m ) ;;
  esac
fi


bailout() {
  echo "  You must have a $KAFKA_USER user and $KAFKA_GROUP group to run this script. "
  echo "  Something like this should suffice for most systems: "
  echo "    # groupadd -g $KAFKA_GID $KAFKA_GROUP "
  echo "    # useradd -u $KAFKA_UID -g $KAFKA_GID -c \"Apache Kafka user\" -d /var/lib/kafka -s /bin/sh $KAFKA_USER "
  echo "  Giving /bin/sh as $KAFKA_USER shell is important as the init script will try tu 'su -' to it."
  exit 1
}

# Bail if user and/or group isn't valid on your system
# uid=319 is suggested to avoid conflicts with other SBo packages,
# but it's your call: http://slackbuilds.org/uid_gid.txt
if ! grep -q "^$KAFKA_USER:" /etc/passwd; then
  bailout
elif ! grep -q "^$KAFKA_GROUP:" /etc/group; then
  bailout
fi

CWD=$(pwd)
TMP=${TMP:-/tmp/SBo}
PKG=$TMP/package-$PRGNAM
OUTPUT=${OUTPUT:-/tmp}

if [ "$ARCH" = "x86_64" ]; then
  LIBDIRSUFFIX="64"
else
  LIBDIRSUFFIX=""
fi

set -e 

rm -rf $PKG
mkdir -p $TMP $PKG $OUTPUT
cd $TMP
rm -rf $PRGNAM-$VERSION
tar xvf $CWD/${PRGNAM}_${SCALA_VERSION}-$VERSION.tgz
cd ${PRGNAM}_${SCALA_VERSION}-$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 {} \;

mkdir -p $PKG/usr/lib${LIBDIRSUFFIX}/$PRGNAM/{libs,bin}
install -m 644 libs/*.jar $PKG/usr/lib${LIBDIRSUFFIX}/$PRGNAM/libs
install -m 775 bin/*.sh $PKG/usr/lib${LIBDIRSUFFIX}/$PRGNAM/bin
(
  cd $PKG/usr/lib${LIBDIRSUFFIX}/$PRGNAM/bin
  sed -i "s|^base_dir=.*|base_dir=/usr/lib$LIBDIRSUFFIX/$PRGNAM/|" kafka-run-class.sh
  sed -i '0,/^$/{s_^$_\n. /etc/kafka/kafka-env.sh\n_}' *.sh
)

mkdir -p $PKG/usr/bin 
(
  cd $PKG/usr/bin
  for script in $PKG/usr/lib${LIBDIRSUFFIX}/$PRGNAM/bin/kafka*
  do
    script_name=$(basename $script)
    ln -s ../lib${LIBDIRSUFFIX}/$PRGNAM/bin/${script_name} 
  done
)

install -dm 750 ${PKG}/var/{lib,log}/$PRGNAM
chown -R $KAFKA_USER:$KAFKA_GROUP $PKG/var/{lib,log}/$PRGNAM

install -dm 755 ${PKG}/etc/$PRGNAM
install -m 644 config/server.properties $PKG/etc/$PRGNAM/server.properties.new
install -m 644 config/consumer.properties $PKG/etc/$PRGNAM/consumer.properties.new
install -m 644 config/producer.properties $PKG/etc/$PRGNAM/producer.properties.new
install -m 644 config/log4j.properties $PKG/etc/$PRGNAM/log4j.properties.new
install -m 644 config/tools-log4j.properties $PKG/etc/$PRGNAM/tools-log4j.properties.new
install -m 644 config/connect-console-sink.properties $PKG/etc/$PRGNAM/connect-console-sink.properties.new
install -m 644 config/connect-console-source.properties $PKG/etc/$PRGNAM/connect-console-source.properties.new
install -m 644 config/connect-distributed.properties $PKG/etc/$PRGNAM/connect-distributed.properties.new
install -m 644 config/connect-file-sink.properties $PKG/etc/$PRGNAM/connect-file-sink.properties.new
install -m 644 config/connect-file-source.properties $PKG/etc/$PRGNAM/connect-file-source.properties.new
install -m 644 config/connect-log4j.properties $PKG/etc/$PRGNAM/connect-log4j.properties.new
install -m 644 config/connect-standalone.properties $PKG/etc/$PRGNAM/connect-standalone.properties.new
install -m 644 $CWD/kafka-env.sh $PKG/etc/$PRGNAM/kafka-env.sh.new
(
  cd $PKG/etc/$PRGNAM
  sed -i "s|^log.dirs=/tmp/kafka-logs$|log.dirs=/var/log/${PRGNAM}|" server.properties.new
  sed -i "s|@KAFKA_HOME@|/usr/lib$LIBDIRSUFFIX/$PRGNAM|" kafka-env.sh.new
)
(
  cd $PKG/usr/lib${LIBDIRSUFFIX}/$PRGNAM
  ln -s /etc/kafka config
)
chown -R $KAFKA_USER:$KAFKA_GROUP $PKG/etc/$PRGNAM

mkdir -p ${PKG}/etc/rc.d
install -o root -g root -m 644 $CWD/rc.$PRGNAM $PKG/etc/rc.d/rc.${PRGNAM}.new

mkdir -p $PKG/usr/doc/$PRGNAM-$VERSION
cp -a \
  LICENSE NOTICE \
  $PKG/usr/doc/$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
cat $CWD/doinst.sh > $PKG/install/doinst.sh

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