#!/bin/sh
#
# $Id$

echo ""
echo "$0 helps you to create an init.d script"
echo "for a Tomcat9 instance around the jpkg-tomcat9 package."
echo ""
echo "If you make a minor typo you might prefer fixing the resulting initscript"
echo "rather than re-doing the script."
echo ""

echo "What is the name of your Tomcat9 instance?"
echo "Please only use letters, digits, and -."
echo "Example: myapp"
echo "Example: myappweb"
echo ""
echo -n "CATALINA_INSTANCE = "
read CATALINA_INSTANCE
echo ""

if [ -z "${CATALINA_INSTANCE}" ] ; then 
  echo "ERROR: Empty input."
  exit 1
fi

echo "You want to name your instance '"${CATALINA_INSTANCE}"'." ; echo ""

INITSCRIPT="/etc/init.d/${CATALINA_INSTANCE}"
if [ -e ${INITSCRIPT} ]
then
  echo "ERROR: An according init script already exists: ${INSTITSCRIPT}"
  exit 2
fi


echo "What is the CATALINA_BASE directory for ${INSTANCE}?"
echo "Default: /var/www/java/${CATALINA_INSTANCE}"
echo "Alternate example: /srv/java/${CATALINA_INSTANCE}"
echo ""
echo -n "CATALINA_BASE = [/var/www/java/${CATALINA_INSTANCE}] "
read CATALINA_BASE
echo ""

if [ -z "${CATALINA_BASE}" ] ; then 
  #echo "ERROR: Empty input."
  #exit 11
  echo "Using default value: /var/www/java/${CATALINA_INSTANCE}"
  CATALINA_BASE="/var/www/java/${CATALINA_INSTANCE}"
  echo ""
fi
echo "DEBUG: CATALINA_BASE=$CATALINA_BASE" ; echo ""

if [ ! -d ${CATALINA_BASE} ]
then
  echo "WARNING: CATALINA_BASE does not point to a directory: ${CATALINA_BASE}"
  #exit 12
  echo "Press Ctrl-C to abort or Enter to automatically create the instance there."
  read ENTER
  echo "Automatically creating a minimal instance in ${CATALINA_BASE}"
  mkdir -pv ${CATALINA_BASE}/conf ${CATALINA_BASE}/temp ${CATALINA_BASE}/webapps 
  cp -uva /usr/share/jpkg-tomcat9/apache-tomcat-9/conf/server.xml ${CATALINA_BASE}/conf/
  cp -uva /usr/share/jpkg-tomcat9/servlets/helloworldservlet.war  ${CATALINA_BASE}/webapps/ROOT.war
  echo '<tomcat-users>' >>${CATALINA_BASE}/conf/tomcat_users.xml
  echo '</tomcat-users>' >>${CATALINA_BASE}/conf/tomcat_users.xml
  echo ""
fi


echo "What is the CATALINA_USER tomcat shall run as?"
echo "Default: www-data"
echo "Alternate example: myapp"
echo "Alternate example: jdoe"
echo ""
echo -n "CATALINA_USER = [www-data] "
read CATALINA_USER
echo ""

if [ -z "${CATALINA_USER}" ] ; then 
  #echo "ERROR: Empty input."
  #exit 31
  echo "Using default value: /var/www/java/${CATALINA_INSTANCE}"
  CATALINA_USER="www-data"
  echo ""
fi
echo "DEBUG: CATALINA_USER=$CATALINA_USER" ; echo ""

if ! /usr/bin/getent passwd ${CATALINA_USER} >/dev/null
then
  echo "ERROR: CATALINA_USER is no known user: ${CATALINA_USER}"
  exit 32
fi


echo "What is the logging directory for ${CATALINA_INSTANCE}?"
echo "Default: /var/log/${CATALINA_INSTANCE}"
echo "Alternate example: ${CATALINA_BASE}/logs"
echo "Alternate example: /var/www/log/${CATALINA_INSTANCE}"
echo "Alternate example: /var/lib/myapp/${CATALINA_INSTANCE}"
echo ""
echo -n "LOGDIR = [/var/log/${CATALINA_INSTANCE}] "
read LOGDIR
echo ""

if [ -z "${LOGDIR}" ] ; then 
  #echo "ERROR: Empty input."
  #exit 41
  echo "Using default value: /var/log/${CATALINA_INSTANCE}"
  LOGDIR="/var/log/${CATALINA_INSTANCE}"
  echo ""
fi
echo "DEBUG: LOGDIR=$LOGDIR" ; echo ""

if [ ! -d ${LOGDIR} ] ; then
  echo "INFO: Logging directory will be created at first start: ${LOGDIR}" ; echo ""
  #exit 42
fi


echo "Which additional directories shall be chown'd to ${CATALINA_USER} for startup?"
echo "Example: /var/lib/${CATALINA_INSTANCE} /var/spool/${CATALINA_INSTANCE}"
echo ""
echo -n "CHOWNDIRS = "
read CHOWNDIRS
echo ""
echo "DEBUG: CHOWNDIRS=$CHOWNDIRS" ; echo ""


echo "Do you want a certain JAVA_HOME to be used?"
echo "Example: /usr/lib/jvm/java-8-openjdk-amd64"
echo "Example: /usr/lib/jvm/java-11-openjdk-amd64"
echo ""
echo -n "JAVA_HOME = "
read JAVA_HOME
echo ""
echo "DEBUG: JAVA_HOME=$JAVA_HOME" ; echo ""

if [ ! -z "$JAVA_HOME" ] ; then
  if [ ! -x "$JAVA_HOME/bin/java" ] ; then
    echo "Your JAVA_HOME does not point to a valid Java Installation: $JAVA_HOME"
    exit 52
  else
    echo "Java version in $JAVA_HOME is:"
    $JAVA_HOME/bin/java -version
    echo ""
  fi
fi


echo "Do you want special JAVA_OPTS?"
echo "Default: -Dfile.encoding=UTF-8 -Xms256m -Xmx1024m"
echo "Example part: -Dfile.encoding=ISO-8859-1"
echo "Example part: -Djava.awt.headless=true"
echo "Enter a space to avoid the default setting."
echo ""
echo -n "JAVA_OPTS = [-Dfile.encoding=UTF-8 -Xms256m -Xmx1024m] "
read JAVA_OPTS
echo ""

if [ -z "${JAVA_OPTS}" ] ; then 
  echo "Using default value: -Dfile.encoding=UTF-8 -Xms256m -Xmx1024m"
  JAVA_OPTS="-Dfile.encoding=UTF-8 -Xms256m -Xmx1024m"
  echo ""
else
  if [ "${JAVA_OPTS}" = " " ] ; then 
    JAVA_OPTS=""
  fi
fi

echo "DEBUG: JAVA_OPTS=$JAVA_OPTS" ; echo ""


echo "We are done with questions ..." ; echo ""

SEDFILE="/tmp/$$.sed"
echo "Creating ${SEDFILE} ..."

test -f "$SEDFILE" && /bin/rm $SEDFILE

echo    "s/_CATALINA_INSTANCE_/${CATALINA_INSTANCE}/g" >>$SEDFILE

echo -n "s/_CATALINA_BASE_/" >>$SEDFILE
echo -n "${CATALINA_BASE}" |sed -e 's/\//\\\//g' >>$SEDFILE
echo    "/g" >>$SEDFILE

echo    "s/_CATALINA_USER_/${CATALINA_USER}/g" >>$SEDFILE

echo -n "s/_CHOWNDIRS_/" >>$SEDFILE
echo -n "${CHOWNDIRS}" |sed -e 's/\//\\\//g' >>$SEDFILE
echo    "/g" >>$SEDFILE

echo -n "s/_LOGDIR_/" >>$SEDFILE
echo -n "${LOGDIR}" |sed -e 's/\//\\\//g' >>$SEDFILE
echo    "/g" >>$SEDFILE

echo -n "s/_JAVA_HOME_/" >>$SEDFILE
echo -n "${JAVA_HOME}" |sed -e 's/\//\\\//g' >>$SEDFILE
echo    "/g" >>$SEDFILE

echo    "s/_JAVA_OPTS_/${JAVA_OPTS}/g" >>$SEDFILE

echo ""
echo "cat-ing /usr/share/jpkg-tomcat9/init.d/instance.template"
echo "through ${SEDFILE} into ${INITSCRIPT}"
echo ""

# make silent backup for debugging
/bin/cp ${SEDFILE} /tmp/jpkg-tomcat9-create-instance.sed

/bin/cat /usr/share/jpkg-tomcat9/init.d/instance.template |sed -f ${SEDFILE} >${INITSCRIPT} && /bin/rm ${SEDFILE}

if [ -f ${SEDFILE} ] ; then
  echo "ERROR: The sed operation seems to have failed."
  exit 61
fi

/bin/chmod 0700 ${INITSCRIPT}

echo "Successfully created ${INITSCRIPT}."
echo ""
echo "Suggesting to continue with:"
echo "vi ${INITSCRIPT}"
if [ -x /bin/systemctl ] ; then
  echo "systemctl daemon-reload"
  echo "systemctl enable ${CATALINA_INSTANCE}"
else
  echo "update-rc.d ${CATALINA_INSTANCE} defaults"
  echo "/etc/init.d/${CATALINA_INSTANCE} start"
fi