CODEWITHSUNDEEP
rubyssh
Jas
Jas

Reputation: 15093

ruby net::ssh does not print stdout data on channel.on_data

I wanted to run a remote command with ruby's net::ssh and was hoping to print the output stdout but i don't see anything printed at the below code at channel.on_data

see test code:

Net::SSH.start('testhost', "root", :timeout => 10) do |ssh|
  ssh.open_channel do |channel|
    channel.exec('ls') do |_, success|
      unless success
        puts "NOT SUCCEESS:! "
      end
      channel.on_data do |_, data|
        puts "DATAAAAAA:! " # ======> Why am i not getting to here?? <=======
      end
      channel.on_extended_data do |_, _, data|
        puts "EXTENDED!!!"
      end
      channel.on_request("exit-status") do |_, data|
        puts "EXIT!!!! "
      end
      channel.on_close do |ch|
        puts "channel is closing!"
      end
    end
  end
end

and the output is:

channel is closing!

why don't i get into the block on_data? I want to grab the stdout.

note that i know the client code is able to ssh to the remote server because when I asked the command to be ls > ls.log I saw that ls.log on target host.

Upvotes: 0

Views: 622

Answers (1)

SztupY
SztupY

Reputation: 10536

Note that opening a channel is asynchronous, so you have to wait for the channel to do anything meaningful, otherwise you are closing the connection too soon.

Try this:

Net::SSH.start('test', "root", :timeout => 10) do |ssh|
  ch = ssh.open_channel do |channel|
    channel.exec('ls') do |_, success|
      unless success
        puts "Error"
      end
      channel.on_data do |_, data|
        puts data
      end
      channel.on_extended_data do |_, _, data|
        puts data
      end
      channel.on_request("exit-status") do |_, data|
        puts "Exit"
      end
      channel.on_close do |ch|
        puts "Closing!"
      end
    end
  end

  ch.wait
end

Upvotes: 2

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