#!/bin/sh
# MUD Nanny
# Sean Middleditch / AwesomePlay Productions, Inc.
# elanthis@awemud.net
# THIS IS PUBLIC DOMAIN

ADMIN="$USER@$(hostname -f)"
MUD_NAME=""
MN_NAME="MUD Nanny"

# Requires that the 'mail' command is in the PATH.

# Default behavior is to restart the MUD, after some wait.  An
# exit code of 0 from the MUD will indicate a desired shutdown of
# the MUD, and the script will return 1 and shutdown MUD Nanny.
# For other exit codes or signal shutdowns, the MUD will be
# restarted immediately if its uptime was at least 30 seconds;
# otherwise, the server will wait 1 hour, as it assumes that
# the MUD is always crashing on startup.

EXIT="$1"
CODE="$2"
TIME="$3"
PATH="$4"

[ -n "$MUD_NAME" ] || MUD_NAME="$PATH"

WAIT="0"
WAITMSG="immediately"

if [ "$TIME" -lt 30 ] ; then
	WAIT="900" # 15 minutes
	WAITMSG="in 15 minutes"
fi

case "$EXIT" in
	'exit')
		[ "$CODE" = 0 ] && exit 1 # intentional shutdown
		mail -s "$MN_NAME [$MUD_NAME]" "$ADMIN" <<-EOF
			$MN_NAME
			
			$MUD_NAME
			Exit code: $CODE
			Uptime: $TIME seconds

			Restarting in $WAITMSG.
		EOF
		;;
	'signal')
		[ "$CODE" = 15 ] && exit 1 # SIGTERM
		mail -s "$MN_NAME [$MUD_NAME]" "$ADMIN" <<-EOF
			$MN_NAME
			
			$MUD_NAME
			Signal: $CODE
			Uptime: $TIME seconds

			Restarting in $WAITMSG.
		EOF
		;;
	*)
		mail -s "$MN_NAME [$MUD_NAME]" "$ADMIN" <<-EOF
			$MN_NAME
			
			$MUD_NAME
			Cause of death: unknown
			Uptime: $TIME seconds

			Restarting $WAITMSG.
		EOF
		;;
esac

[ "$WAIT" -ne "0" ] && sleep "$WAIT"
exit 0