openresty init.d script

openresty

#!/bin/sh
### BEGIN INIT INFO
# Provides:   openresty
# Required-Start:    $local_fs $remote_fs $network $syslog $named
# Required-Stop:     $local_fs $remote_fs $network $syslog $named
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: starts openresty
# Description:       starts openresty using start-stop-daemon
### END INIT INFO

PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

# openresty's home
OPENRESTY_HOME=/etc/openresty

# app work space
OPENRESTY_WORKSPACE=${OPENRESTY_HOME}/nginx

# openresty's  exec binary file
DAEMON=${OPENRESTY_HOME}/bin/openresty

# set prefix path (default: /etc/openresty/nginx/)
DAEMON_OPTS="-p ${OPENRESTY_WORKSPACE}"

# daemon name u can run the cmd `ps h -p $(cat /var/run/nginx.pid) -o comm` to confirm this value
# if this value not eq $(ps h -p $(cat /var/run/nginx.pid) -o comm) , u can run this service but cannot stop it
# more info https://unix.stackexchange.com/a/137522
NAME=openresty

DESC="full-fledged web platform"

if [ -r /etc/default/openresty ]; then
        . /etc/default/openresty
fi

STOP_SCHEDULE="${STOP_SCHEDULE:-QUIT/5/TERM/5/KILL/5}"

test -x $DAEMON || exit 0
. /lib/init/vars.sh
. /lib/lsb/init-functions

PID=$(cat ${OPENRESTY_WORKSPACE}/conf/nginx.conf | grep -Ev '^\s*#' | awk 'BEGIN { RS="[;{}]" } { if ($1 == "pid") print $2 }' | head -n1)

if [ -z "$PID" ]; then
    PID=${OPENRESTY_WORKSPACE}/logs/nginx.pid
fi

start_nginx() {
    # Start the daemon/service
    #
    # Returns:
    #   0 if daemon has been started
    #   1 if daemon was already running
    #   2 if daemon could not be started
    start-stop-daemon --start --quiet --pidfile $PID --exec $DAEMON --test > /dev/null \
        || return 1
    start-stop-daemon --start --quiet --pidfile $PID --exec $DAEMON -- \
        $DAEMON_OPTS 2>/dev/null \
        || return 2
}
test_config() {
    $DAEMON -q -t $DAEMON_OPTS >/dev/null 2>&1
}
stop_nginx() {
    # Stops the daemon/service
    #
    # Return
    #   0 if daemon has been stopped
    #   1 if daemon was already stopped
    #   2 if daemon could not be stopped
    #   other if a failure occurred
    start-stop-daemon --stop --quiet --retry=$STOP_SCHEDULE --pidfile $PID --name $NAME
    RETVAL="$?"
    sleep 1
    return "$RETVAL"
}
reload_nginx() {
    # Function that sends a SIGHUP to the daemon/service
    start-stop-daemon --stop --signal HUP --quiet --pidfile $PID --name $NAME
    return 0
}
rotate_logs() {
    # Rotate log files
    start-stop-daemon --stop --signal USR1 --quiet --pidfile $PID --name $NAME
    return 0
}
upgrade_nginx() {
    # Online upgrade nginx executable
    # http://nginx.org/en/docs/control.html
    #
    # Return
    #   0 if nginx has been successfully upgraded
    #   1 if nginx is not running
    #   2 if the pid files were not created on time
    #   3 if the old master could not be killed
    if start-stop-daemon --stop --signal USR2 --quiet --pidfile $PID --name $NAME; then
        # Wait for both old and new master to write their pid file
        while [ ! -s "${PID}.oldbin" ] || [ ! -s "${PID}" ]; do
            cnt=`expr $cnt + 1`
            if [ $cnt -gt 10 ]; then
                return 2
            fi
            sleep 1
        done
        # Everything is ready, gracefully stop the old master
        if start-stop-daemon --stop --signal QUIT --quiet --pidfile "${PID}.oldbin" --name $NAME; then
            return 0
        else
            return 3
        fi
    else
        return 1
    fi
}
case "$1" in
    start)
        log_daemon_msg "Starting $DESC" "$NAME"
        start_nginx
        case "$?" in
            0|1) log_end_msg 0 ;;
            2)   log_end_msg 1 ;;
        esac
        ;;
    stop)
        log_daemon_msg "Stopping $DESC" "$NAME"
        stop_nginx
        case "$?" in
            0|1) log_end_msg 0 ;;
            2)   log_end_msg 1 ;;
        esac
        ;;
    restart)
        log_daemon_msg "Restarting $DESC" "$NAME"
        # Check configuration before stopping nginx
        if ! test_config; then
            log_end_msg 1 # Configuration error
            exit $?
        fi
        stop_nginx
        case "$?" in
            0|1)
                start_nginx
                case "$?" in
                    0) log_end_msg 0 ;;
                    1) log_end_msg 1 ;; # Old process is still running
                    *) log_end_msg 1 ;; # Failed to start
                esac
                ;;
            *)
                # Failed to stop
                log_end_msg 1
                ;;
        esac
        ;;
    reload|force-reload)
        log_daemon_msg "Reloading $DESC configuration" "$NAME"
        # Check configuration before stopping nginx
        #
        # This is not entirely correct since the on-disk nginx binary
        # may differ from the in-memory one, but that's not common.
        # We prefer to check the configuration and return an error
        # to the administrator.
        if ! test_config; then
            log_end_msg 1 # Configuration error
            exit $?
        fi
        reload_nginx
        log_end_msg $?
        ;;
    configtest|testconfig)
        log_daemon_msg "Testing $DESC configuration"
        test_config
        log_end_msg $?
        ;;
    status)
        status_of_proc -p $PID "$DAEMON" "$NAME" && exit 0 || exit $?
        ;;
    upgrade)
        log_daemon_msg "Upgrading binary" "$NAME"
        upgrade_nginx
        log_end_msg $?
        ;;
    rotate)
        log_daemon_msg "Re-opening $DESC log files" "$NAME"
        rotate_logs
        log_end_msg $?
        ;;
    *)
        echo "Usage: $NAME {start|stop|restart|reload|force-reload|status|configtest|rotate|upgrade}" >&2
        exit 3
        ;;
esac