#!/bin/sh

### BEGIN INIT INFO
# Provides: nam_adapter
# Required-Start: $local_fs $remote_fs $network $syslog
# Required-Stop: $local_fs $remote_fs $network $syslog
# Default-Start: 3 4 5
# Default-Stop: 0 1 2 6
# Short-Description: Init script for starting up NAM service
# Description: NAM Adapter is component to monitoring data from probes.
### END INIT INFO

PATH=/sbin:/usr/sbin:/bin:/usr/bin
DESC="NAM Adapter Service"
NAME=nam_adapter
DAEMON=/home/NAM/NAM_Adapter/
DAEMON_ARGS=""
DAEMON_USER=userxifi
PIDFILE=/var/run/$NAME.pid
SCRIPTNAME=/etc/init.d/$NAME

# Exit if the component is not installed
[ -x "$DAEMON" ] || exit 0

# Read configuration variable files, if present
[ -r /etc/profile ] && . /etc/profile
[ -r /etc/default/$NAME ] && . /etc/default/$NAME

# Load the VERBOSE setting and other rcS variables
. /lib/init/vars.sh

# Define LSB log_* functions.
# Depend on lsb-base (>= 3.2-14) to ensure that this file is present
# and status_of_proc is working.
. /lib/lsb/init-functions

# Function that checks configuration
do_checkup()
{
local euid=$(id -u)
local user=${DAEMON_USER:-none}
# check privileges
[ $euid -eq 0 ] || { log_failure_msg "Must be superuser to do that action"; return 1; }
# check DAEMON_USER
id $user >/dev/null 2>&1 || { log_failure_msg "User $DAEMON_USER not found"; return 1; }
# check Node.js V8 engine
[ -n "$(node -v 2>/dev/null)" ] || { log_failure_msg "Node engine not found"; return 1; }
}

# Function that starts the daemon/service
do_start()
{
# Return
# 0 if daemon has been started
# 1 if daemon was already running
# 2 if daemon could not be started
do_checkup || return 2
start-stop-daemon --start --quiet --pidfile $PIDFILE \
--startas $DAEMON --test > /dev/null \
|| return 1
start-stop-daemon --start --quiet --pidfile $PIDFILE --make-pidfile \
--background --chuid $DAEMON_USER \
--startas $DAEMON -- $DAEMON_ARGS \
|| return 2
}

# Function that stops the daemon/service
do_stop()
{
# Return
# 0 if daemon has been stopped
# 1 if daemon was already stopped
# 2 if daemon could not be stopped
# other if a failure occurred
do_checkup || return 2
start-stop-daemon --stop --quiet --retry=TERM/30/KILL/5 --pidfile $PIDFILE
RETVAL="$?"
[ "$RETVAL" = 2 ] && return 2
# Wait for children to finish too if this is a daemon that forks
# and if the daemon is only ever run from this initscript.
# If the above conditions are not satisfied then add some other code
# that waits for the process to drop all resources that could be
# needed by services started subsequently. A last resort is to
# sleep for some time.
start-stop-daemon --stop --quiet --oknodo --retry=0/30/KILL/5 --exec $DAEMON
[ "$?" = 2 ] && return 2
# Many daemons don't delete their pidfiles when they exit.
rm -f $PIDFILE
return "$RETVAL"
}

case "$1" in
start)
[ "$VERBOSE" != no ] && log_daemon_msg "Starting $DESC" "$NAME"
do_start
case "$?" in
0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
esac
;;
stop)
[ "$VERBOSE" != no ] && log_daemon_msg "Stopping $DESC" "$NAME"
do_stop
case "$?" in
0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
esac
;;
status)
status_of_proc -p"$PIDFILE" "$DAEMON" "$NAME" && exit 0 || exit $?
;;
*)
echo "Usage: $SCRIPTNAME {start|stop|status}" >&2
exit 3
;;
esac

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