#!/bin/sh
# ianb@erislabs.net 20081202
# configure a mir system for sun or gcj java
# checkpoint code taken from zak's mir-setup

set -e

# NAME is used when called from mir-prepare
NAME=""

CUR_CHECKPOINT=0
checkpoint()
{
  CUR_CHECKPOINT=$(($CUR_CHECKPOINT + 1))
  if [ -n "$START_CHECKPOINT" ]; then
    if [ "$CUR_CHECKPOINT" -lt "$START_CHECKPOINT" ]; then
      echo "${NAME}Skipping checkpoint $CUR_CHECKPOINT: $@"
      unset RUNNING
    else
      echo "${NAME}Running from checkpoint $CUR_CHECKPOINT: $@"
      RUNNING=1
    fi
  else
    echo "${NAME}Checkpoint $CUR_CHECKPOINT: $@"
    RUNNING=1
  fi
}

optdie()
{
  echo >&2 "$@";
  echo >&2 "Try $PROG --help";
  exit 1;
}

usage() {
    echo >&2 "Usage: $PROG [options] sun|gcj"
    echo >&2 "  Configures java implementation to use with mir"
    echo >&2 "    -d|--debug                Debugging output, including 'set -x' shell trace"
    echo >&2 "    -p|--checkpoint <start>   Run from specified checkpoint after failed run"
    echo >&2 "    sun                       Use Sun Java (non-free)" 
    echo >&2 "    gcj                       Use the GNU Java Compiler"
}

if [ $# -lt 1 ]
then
    usage
    exit 1
fi

while [ $# != 0 ]; do
    case "$1" in
	-d|--debug)  set -x; DEBUG=1 ;;
	-p|--checkpoint) shift; START_CHECKPOINT="$1" ;;
	--subprocess) NAME="[mir-choose-java] " ;;
	-h|-?|--help) usage; exit 0 ;;
        -*) optdie "$PROG: unknown option $1" ;;
        sun) JAVA=sun ; break;;
        gcj) JAVA=gcj ; break;;
	*) optdie "$PROG: unexpected argument '$1'" ;;
    esac
    shift
done

if [ $JAVA = sun ]
then
    JAVANAME=java-6-sun
    PACKAGES="sun-java6-jdk sun-java6-jre"
    RTPATH=/usr/lib/jvm/java-6-sun/jre/lib/rt.jar
else
    JAVANAME=java-gcj
    PACKAGES=gcj
    RTPATH=/usr/lib/jvm/java-1.5.0-gcj-4.3-1.5.0.0/jre/lib/rt.jar
fi

JAVAHOME="/usr/lib/jvm/$JAVANAME"

if [ $JAVA = sun ]
then
    checkpoint "Adding non-free archive for sun java"
    if [ -n "$RUNNING" ]
    then
	perl -pi.bak -e \
	    'if(/^deb/ && !/security\.debian\.org/ && !/non-free/) { s/(main)/$1 contrib non-free/; }' \
	    /etc/apt/sources.list
	apt-get update
    fi
else
    # so checkpoint numbers don't differ
    checkpoint "Skipping non-free archive configuration - gcj is in main"
fi

checkpoint "Installing packages"
if [ -n "$RUNNING" ]
then
    apt-get install $PACKAGES
    echo "You probably want to do 'apt-get clean'"
fi

checkpoint "Selecting JDK"
if [ -n "$RUNNING" ]
then
    update-java-alternatives --set $JAVANAME || true
fi

checkpoint "Configuring apache jakarta JVM"
if [ -n "$RUNNING" ]
then
    if grep -q '^workers.java_home' /etc/libapache2-mod-jk/workers.properties
    then
	perl -pi.bak -e 's,workers.java_home.*,workers.java_home='"$JAVAHOME"',;' \
	  /etc/libapache2-mod-jk/workers.properties
    fi
fi

checkpoint "Configuring tomcat JVM"
if [ -n "$RUNNING" ]
then
    TOMCATDEFAULTS=/etc/default/tomcat6
    if grep -q '^#\?JAVA_HOME' $TOMCATDEFAULTS
    then
	perl -pi.bak -e 's,^\#?JAVA_HOME.*,JAVA_HOME='"$JAVAHOME"',;' $TOMCATDEFAULTS
    else
	echo "JAVA_HOME=$JAVAHOME" >> $TOMCATDEFAULTS
    fi
fi

checkpoint "Configuring /etc/mir-setup/lib/rt.jar symlink"
if [ -n "$RUNNING" ]
then
    mkdir -p /etc/mir-setup/lib
    ln -sf $RTPATH /etc/mir-setup/lib/rt.jar
fi

checkpoint "Restarting tomcat and apache"
if [ -n "$RUNNING" ]
then
    invoke-rc.d tomcat6   force-reload
    invoke-rc.d apache2   force-reload
fi

checkpoint "Finished!"