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creates scripts that can be used to manage services

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#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# adds JAVA_HOME and into PATH in global and user-specific profiles
function setupJavaHomeInProfile() {
  PROFILES=(/etc/bashrc $HOME/.bashrc /etc/skel/.bashrc)
  test -n "$SUDO_USER" &&
    PROFILES=(${PROFILES[*]} `getent passwd $SUDO_USER| cut -f6 -d:`/.bashrc)
  for PROFILE in ${PROFILES[*]}; do
    cat >> $PROFILE <<-'END_OF_JCLOUDS_FILE'
	export JAVA_HOME=/usr/local/jdk
	export PATH=$JAVA_HOME/bin:$PATH
END_OF_JCLOUDS_FILE
  done
}

# resets JAVA_HOME to what an openjdk installer created
function findOpenJDK() {
  local oldJavaHome=$JAVA_HOME
  unset JAVA_HOME
  for CANDIDATE in $oldJavaHome `ls -d /usr/lib/jvm/java-*-openjdk* 2>&-`; do
    if [ -n "$CANDIDATE" -a -x "$CANDIDATE/bin/java" ]; then
      export JAVA_HOME=$CANDIDATE
      break
    fi
  done
}

# assures JDK installed and JAVA_HOME to a link at /usr/local/jdk
function installOpenJDK() {
  if [ "$JAVA_HOME" == "/usr/local/jdk" ]; then
    echo skipping as JAVA_HOME is already set to /usr/local/jdk
    return 0
  fi
  if [ -n "$JAVA_HOME" -a -x "$JAVA_HOME/bin/java" ]; then
    echo reusing JAVA_HOME $JAVA_HOME
  else
    if which dpkg &> /dev/null; then
      apt-get-update && \
          PACKAGE=$(apt-cache search --names-only '^openjdk-.-jdk$' | sort -r | cut -d' ' -f1 | head -1) && \
          [ ! -z "$PACKAGE" ] && \
          {  apt-get-install $PACKAGE-headless || apt-get-install $PACKAGE; }
    elif which rpm &> /dev/null; then
      PACKAGE=$(repoquery --qf='%{name}' --pkgnarrow=available 'java-*-openjdk-devel' | sort -r | head -1) && \
        [ ! -z "$PACKAGE" ] && \
        yum-install $PACKAGE
    else
      abort "we only support apt-get and yum right now... please contribute"
    fi
    findOpenJDK
    if [ -n "$JAVA_HOME" ]; then
      echo installed JAVA_HOME $JAVA_HOME
    else
      abort "JDK installation failed"
    fi
  fi
  rm -rf /usr/local/jdk
  ln -Fs $JAVA_HOME /usr/local/jdk
  /usr/local/jdk/bin/java -version || abort "cannot run java"
  setupJavaHomeInProfile
}