From: Brian Candler <b.candler@...>
Date: 2009-06-01T21:59:34+09:00
Subject: Re: How can I get command's result code, which executing via ssh

A quick check of the SSH protocol spec in RFC 4254 says, in section 
6.10:

   When the command running at the other end terminates, the following
   message can be sent to return the exit status of the command.
   Returning the status is RECOMMENDED.  No acknowledgement is sent for
   this message.  The channel needs to be closed with
   SSH_MSG_CHANNEL_CLOSE after this message.

   The client MAY ignore these messages.

      byte      SSH_MSG_CHANNEL_REQUEST
      uint32    recipient channel
      string    "exit-status"
      boolean   FALSE
      uint32    exit_status

(and it then goes on to describe the "exit-signal" message as well)

Grepping for exit-status in the net-ssh source turns up an example of 
how to get it:

    # * "exit-status" : the exit status of the remote process will be 
reported
    #   as a long integer in the data buffer, which you can grab via
    #   data.read_long.
    # * "exit-signal" : if the remote process died as a result of a 
signal
    #   being sent to it, the signal will be reported as a string in the
    #   data, via data.read_string. (Not all SSH servers support this 
channel
    #   request type.)
    #
    #   channel.on_request "exit-status" do |ch, data|
    #     puts "process terminated with exit status: #{data.read_long}"
    #   end
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