keepalive

gistfile1.sh

#! /bin/bash
#
# # keepalive #
#
# Keeps your processes running - handy quick-restart for services.
# 
# USAGE:
#
# Run a server with:
#
#   keepalive my_server [ARGS]
# 
# When 'my_server' exits, keepalive will restart it. If the INT signal is
# received (e.g. if you press ctrl-c), keepalive will give you a brief window to
# send it again if you really want to quit, before starting the server back up.
#

SERVER_CMD=$@
INTERRUPT_DELAY=2 # seconds
CRASH_DELAY=1     # seconds

interrupted() {
  echo "Interrupt received. Press ctrl-c again to quit"
  trap - INT
  sleep $INTERRUPT_DELAY
  trap interrupted INT
}

run() {
  trap interrupted INT
  until $SERVER_CMD ; do
    echo "Server '$SERVER_CMD' crashed with exit code $?. Respawning.." >&2
    sleep $CRASH_DELAY
  done
  trap - INT
}

run $SERVER_CMD