run script from user data on aws for centos

README.md

Install

curl -o /etc/init.d/auto-userscript \
  https://gist.githubusercontent.com/ngyuki/61bf0262dc1bf450499a/raw/auto-userscript

chmod +x /etc/init.d/auto-userscript

chkconfig --add auto-userscript

License

MIT

auto-userscript

#! /bin/bash
#
# chkconfig: 2345 50 50

. /etc/init.d/functions

prog=auto-userscript

# default: EC2 user-data
URL=http://169.254.169.254/latest/user-data

if [ -f /etc/sysconfig/$prog ]; then
  . /etc/sysconfig/$prog
fi

function start() {
  echo -n "Start auto run userscript"

  (
    set -eu
    local tmp=

    exec 1> >(logger -t $prog -i)
    exec 2>&1

    function fin () {
      [ -f "$tmp" ] && rm -fv "$tmp"
    }

    trap fin EXIT

    tmp=$(mktemp --suffix=.$prog)

    echo "download $URL -> $tmp"
    curl -fsS "${URL}" -o "$tmp"

    if head -1 "$tmp" | grep '^#!' >/dev/null; then
      chmod +x "$tmp"
      echo ">>> run userscript"
      "$tmp"
      echo "<<< end userscript"
    fi
  )

  rc=$?
  [ $rc -eq 0 ] && success || failure
  echo

  return $rc
}

case "$1" in
  start)
    start
    exit $?
    ;;
  stop|status)
    exit 0
    ;;
  *)
    echo $"Usage: $0 {start|stop|status}"
    exit 2
esac

exit 0