From: Guillermo Riojas <guillermo.riojas@...>
Date: 2010-11-27T02:17:14+09:00
Subject: Net::SSH.exec Using the "exec" method interactively

Hi there,

Recently i started playing with the Net::SSH gem. So far, good, but i
just came across i question i haven't been able to respond.

My intention is to issue several commands using the same channel in
order to be able to give continuity to my list of instructions, making
it somehow "interactive". So far, after the first command is typed and
the output returned, the rest of the instructions seem to be "not
executed". As i am pretty new to the gem and SSH in general, i realized
that somehow once the channel is closed the session too and of course,
opening a new channel puts me back in the starting point.

So if i would like to create folder, navigate to the folder i just
created , do some other stuff there and then exit, wont work as i
expect, because every command sent starts in a new session.

A sample of the code here:

def exec_cmd
  cont = true

  channel = @ssh.open_channel do |chn|
    while cont
      print "cmd> "; STDOUT.flush; str = gets.chop  #User input command
      cont = false if str.empty?
      channel_execute chn, str.to_s
    end
  end #channel open loop

  channel.wait
end

def channel_execute(chn, cmd = nil)
  return nil if cmd.nil?
  puts "Executing Command [#{cmd}]"

  chn.exec(cmd.to_s) do |ch,success|
    raise "Could not execute command" unless success

    ch.on_data do |c, data|
      out = data.split("\n")
      out.each do |e|
        puts "#{e}"
      end
    end

    ch.on_extended_data do |c, type, data|
      out = data.split("\n")
      out.each do |e|
        puts "#{e}"
      end
    end

    ch.on_close { @log.debug("exec") {"Command loop finished."} }

  end #chn exec loop

  chn.wait

end


Now, my first work around is sending once the list of all the commands,
in this way "mkdir testfolder; cd testfolder; mkdir testfolder2; cd /;
..."

However, is there any way i can keep the channel "open" in order to be
able to send each and every command separately?

Any hint is greatly appreaciated.

guillermo

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