Add Amazon Linux init script

Add support for 'amazon' platform for init script template.

Fixes #387.

templates/amazon/initscript.erb

@@ -0,0 +1,188 @@
+#!/bin/sh
+#
+# elasticsearch <summary>
+#
+# chkconfig:   2345 80 20
+# description: Starts and stops a single elasticsearch instance on this system
+#
+
+### BEGIN INIT INFO
+# Provides: Elasticsearch
+# Required-Start: $network $named
+# Required-Stop: $network $named
+# Default-Start: 2 3 4 5
+# Default-Stop: 0 1 6
+# Short-Description: This service manages the elasticsearch daemon
+# Description: Elasticsearch is a very scalable, schema-free and high-performance search solution supporting multi-tenancy and near realtime search.
+### END INIT INFO
+
+#
+# init.d / servicectl compatibility (openSUSE)
+#
+if [ -f /etc/rc.status ]; then
+    . /etc/rc.status
+    rc_reset
+fi
+
+#
+# Source function library.
+#
+if [ -f /etc/rc.d/init.d/functions ]; then
+    . /etc/rc.d/init.d/functions
+fi
+
+# Sets the default values for elasticsearch variables used in this script
+ES_USER="elasticsearch"
+ES_GROUP="elasticsearch"
+ES_HOME="/usr/share/elasticsearch"
+MAX_OPEN_FILES=65535
+MAX_MAP_COUNT=262144
+LOG_DIR="/var/log/elasticsearch"
+DATA_DIR="/var/lib/elasticsearch"
+CONF_DIR="/etc/elasticsearch"
+
+PID_DIR="/var/run/elasticsearch"
+
+# Source the default env file
+ES_ENV_FILE="/etc/sysconfig/<%= @program_name %>"
+if [ -f "$ES_ENV_FILE" ]; then
+    . "$ES_ENV_FILE"
+fi
+
+# CONF_FILE setting was removed
+if [ ! -z "$CONF_FILE" ]; then
+    echo "CONF_FILE setting is no longer supported. elasticsearch.yml must be placed in the config directory and cannot be renamed."
+    exit 1
+fi
+
+exec="$ES_HOME/bin/elasticsearch"
+prog="<%= @program_name %>"
+pidfile="$PID_DIR/${prog}.pid"
+
+export ES_HEAP_SIZE
+export ES_HEAP_NEWSIZE
+export ES_DIRECT_SIZE
+export ES_JAVA_OPTS
+export ES_GC_LOG_FILE
+export JAVA_HOME
+
+lockfile=/var/lock/subsys/$prog
+
+# backwards compatibility for old config sysconfig files, pre 0.90.1
+if [ -n $USER ] && [ -z $ES_USER ] ; then
+   ES_USER=$USER
+fi
+
+checkJava() {
+    if [ -x "$JAVA_HOME/bin/java" ]; then
+        JAVA="$JAVA_HOME/bin/java"
+    else
+        JAVA=`which java`
+    fi
+
+    if [ ! -x "$JAVA" ]; then
+        echo "Could not find any executable java binary. Please install java in your PATH or set JAVA_HOME"
+        exit 1
+    fi
+}
+
+start() {
+    checkJava
+    [ -x $exec ] || exit 5
+    if [ -n "$MAX_LOCKED_MEMORY" -a -z "$ES_HEAP_SIZE" ]; then
+        echo "MAX_LOCKED_MEMORY is set - ES_HEAP_SIZE must also be set"
+        return 7
+    fi
+    if [ -n "$MAX_OPEN_FILES" ]; then
+        ulimit -n $MAX_OPEN_FILES
+    fi
+    if [ -n "$MAX_LOCKED_MEMORY" ]; then
+        ulimit -l $MAX_LOCKED_MEMORY
+    fi
+    if [ -n "$MAX_MAP_COUNT" -a -f /proc/sys/vm/max_map_count ]; then
+        sysctl -q -w vm.max_map_count=$MAX_MAP_COUNT
+    fi
+    export ES_GC_LOG_FILE
+
+    # Ensure that the PID_DIR exists (it is cleaned at OS startup time)
+    if [ -n "$PID_DIR" ] && [ ! -e "$PID_DIR" ]; then
+        mkdir -p "$PID_DIR" && chown "$ES_USER":"$ES_GROUP" "$PID_DIR"
+    fi
+    if [ -n "$pidfile" ] && [ ! -e "$pidfile" ]; then
+        touch "$pidfile" && chown "$ES_USER":"$ES_GROUP" "$pidfile"
+    fi
+
+    cd $ES_HOME
+    echo -n $"Starting $prog: "
+    # if not running, start it up here, usually something like "daemon $exec"
+    daemon --user $ES_USER --pidfile $pidfile $exec -p $pidfile -d -Des.default.path.home=$ES_HOME -Des.default.path.logs=$LOG_DIR -Des.default.path.data=$DATA_DIR -Des.default.path.conf=$CONF_DIR
+    retval=$?
+    echo
+    [ $retval -eq 0 ] && touch $lockfile
+    return $retval
+}
+
+stop() {
+    echo -n $"Stopping $prog: "
+    # stop it here, often "killproc $prog"
+    killproc -p $pidfile -d 86400 $prog
+    retval=$?
+    echo
+    [ $retval -eq 0 ] && rm -f $lockfile
+    return $retval
+}
+
+restart() {
+    stop
+    start
+}
+
+reload() {
+    restart
+}
+
+force_reload() {
+    restart
+}
+
+rh_status() {
+    # run checks to determine if the service is running or use generic status
+    status -p $pidfile $prog
+}
+
+rh_status_q() {
+    rh_status >/dev/null 2>&1
+}
+
+
+case "$1" in
+    start)
+        rh_status_q && exit 0
+        $1
+        ;;
+    stop)
+        rh_status_q || exit 0
+        $1
+        ;;
+    restart)
+        $1
+        ;;
+    reload)
+        rh_status_q || exit 7
+        $1
+        ;;
+    force-reload)
+        force_reload
+        ;;
+    status)
+        rh_status
+        ;;
+    condrestart|try-restart)
+        rh_status_q || exit 0
+        restart
+        ;;
+    *)
+        echo $"Usage: $0 {start|stop|status|restart|condrestart|try-restart|reload|force-reload}"
+        exit 2
+esac
+exit $?