Ssh agent starting on (multiple machines)

bashrc_local

containsElement () {
  local e
  for e in ${@:2}; do [[ "$e" == "$1" ]] && return 0; done
  return 1
}

allowed_ssh_agents=('kronos kronos-dev shrek lrc lrc1 lrc2')
agent_file_prefix="$HOME/.ssh/environment"
hostname=`hostname -s`
agent_file="${agent_file_prefix}${hostname}"


start_agent () {
  echo "Initialising new SSH agent for $hostname"
  ssh-agent | sed 's/^echo/#echo/' > "$agent_file"
  chmod 600 "$agent_file"
  . "$agent_file" > /dev/null
  alias ssh="ssh -XYC" # Force X-forwarding (+alias adding the key to agent)
  ssh-add -l >/dev/null || { alias ssh='ssh-add -l >/dev/null || ssh-add && alias ssh="ssh -XYC"; ssh -XYC'; }
  ssh_pid=$(cat $agent_file 2> /dev/null | grep 'AGENT_PID' | sed 's/.*=\([0-9]*\);.*/\1/')
  echo "SSH agent(pid: $ssh_pid) started on $hostname"
}

# Source SSH settings, if applicable
# if ( tty -s) ; then
if containsElement "$hostname" "${allowed_ssh_agents[@]}" ; then
  echo test allowed
  if [ -f "${agent_file}" ] ; then 
     . "${agent_file}" > /dev/null
     #ps ${SSH_AGENT_PID} doesn't work under cywgin
     ps -ef | grep ${SSH_AGENT_PID} | grep 'ssh-agent$' > /dev/null || {
         start_agent;
     }
  else
     start_agent;
  fi
else
  echo "SSH agent on $hostname is not allowed."
fi