nagios4/startup/openrc-init.in

#!/sbin/openrc-run

# These two facilitate the bindir variable substitution below.
prefix=@prefix@
exec_prefix=@exec_prefix@

# This is a custom variable, and has the following default value if a
# specific config file is not defined by the user.
: ${NAGIOS_CONFIG:="@sysconfdir@/nagios.cfg"}

# The rest are OpenRC variables.
extra_commands="checkconfig"
extra_started_commands="reload"

# We put "--daemon" in command_args and not command_args_background
# because the latter interacts weirdly with the config file argument.
command="@bindir@/nagios"
command_args="--daemon ${NAGIOS_CONFIG}"
pidfile="@subsyslockfile@"

depend(){
  # Most daemons don't really *need* the network; they're happy with
  # the loopback interface. However, nagios might start generating
  # "EVERYTHING IS DOWN" alerts if it starts before the real live
  # network comes up.
  need net
  use logger
  after mysql postgresql
}

reload(){
  checkconfig || return $?
  ebegin "Reloading configuration"
  start-stop-daemon --signal HUP --pidfile "${pidfile}"
  eend $?
}

checkconfig(){
  ebegin "Verifying config files"

  # Save the output in case verification fails and errors are printed.
  OUTPUT=$( ${command} --verify-config "${NAGIOS_CONFIG}" )

  # Save the exit code from the verification so that `echo` doesn't
  # clobber it. Then, if verification failed, show its
  # output. Otherwise, succeed quietly.
  local exit_code=$?
  [ $exit_code -ne 0 ] && echo "${OUTPUT}" >&2
  eend $exit_code
}

start_pre() {
  # Without this, the "start" action will appear to succeed even if
  # the config file contains errors, and the daemon fails to start.
  # Another approach would be to wait for the PID file to appear, but
  # this is fast enough and feels cleaner.
  checkconfig || return $?
}

stop_pre() {
  # If this is a restart, check to make sure the user's config
  # isn't busted before we stop the running daemon.
  if [ "${RC_CMD}" = "restart" ] ; then
    checkconfig || return $?
  fi
}