consul_debianinit.j2

#!/bin/sh
### BEGIN INIT INFO
# Provides:          consul
# Required-Start:    $local_fs $remote_fs
# Required-Stop:     $local_fs $remote_fs
# Default-Start:     2 3 4 5
# Default-Stop:      S 0 1 6
# Short-Description: Distributed service discovery framework
# Description:       Distributed service discovery / health check framework
### END INIT INFO

# Do NOT "set -e"

# PATH should only include /usr/* if it runs after the mountnfs.sh script

PATH="{{ consul_bin_path }}:/usr/sbin:/usr/bin:/sbin:/bin"
DESC="Consul service discovery framework"
NAME="consul"
DAEMON="{{ consul_bin_path }}/${NAME}"
PIDFILE="{{ consul_run_path }}/${NAME}.pid"
DAEMON_ARGS="agent -config-file={{ consul_config_path }}/config.json -config-dir={{ consul_configd_path }}"
USER={{ consul_user }}
SCRIPTNAME=/etc/init.d/"${NAME}"

# Exit if Consul is not installed
[ -x "${DAEMON}" ] || exit 0

# Read default variables file
[ -r /etc/default/"${NAME}" ] && . /etc/default/"${NAME}"

# Source rcS variables
[ -f /etc/default/rcS ] && . /etc/default/rcS

# Source LSB functions
. /lib/lsb/init-functions

# Make sure PID dir exists
mkrundir() {
        [ ! -d {{ consul_run_path }} ] && mkdir -p {{ consul_run_path }}
        chown {{ consul_user }} {{ consul_run_path }}
}

# Start the Consul service
do_start() {
    echo "Starting consul and backgrounding"
    mkrundir
    start-stop-daemon --start --quiet --pidfile "${PIDFILE}" --exec "${DAEMON}" --chuid "${USER}" --background --make-pidfile --test > /dev/null \
        || return 1
    start-stop-daemon --start --quiet --pidfile "${PIDFILE}" --exec "${DAEMON}" --chuid "${USER}" --background --make-pidfile -- \
        ${DAEMON_ARGS} \
        || return 2

    echo -n "Waiting for Consul service..."
    for i in `seq 1 30`; do
        if ! start-stop-daemon --quiet --stop --test --pidfile "${PIDFILE}" --exec "${DAEMON}" --user "${USER}"; then
            echo " FAIL: consul process died"
            return 2
        fi
        if "${DAEMON}" info >/dev/null; then
            echo " OK"
            return 0
        fi
        echo -n .
        sleep 1
    done
    echo " FAIL: consul process is alive, but is not listening."
    return 2
}

# Stop the Consul service
do_stop() {
    "${DAEMON}" leave
    start-stop-daemon --stop --quiet --retry=TERM/30/KILL/5 --pidfile "${PIDFILE}" --name "${NAME}"
    RETVAL="$?"
    [ "${RETVAL}" = 2 ] && return 2
    start-stop-daemon --stop --quiet --oknodo --retry=0/30/KILL/5 --exec "${DAEMON}"
    [ "$?" = 2 ] && return 2
    rm -f "${PIDFILE}"
    return "${RETVAL}"
}

# Reload Consul
do_reload() {
    start-stop-daemon --stop --signal 1 --quiet --pidfile "${PIDFILE}" --name "${NAME}"
    return 0
}

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
    ;;
  restart|force-reload)
    log_daemon_msg "Restarting ${DESC}" "${NAME}"
    do_stop
    case "$?" in
      0|1)
        do_start
        case "$?" in
            0) log_end_msg 0 ;;
            1) log_end_msg 1 ;;
            *) log_end_msg 1 ;;
        esac
        ;;
      *)
        # Stop failed
        log_end_msg 1
        ;;
    esac
    ;;
  *)
    echo "Usage: ${SCRIPTNAME} {start|stop|restart|force-reload}" >&2
    exit 3
    ;;
esac

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