How to get exit status with Ruby's Net::SSH library?

Question

I have a snippet of code, simply trying to execute a script on a remote server, in the event that it fails, I\'d like to make a follow-up call, imagine this:

req         


        

Answer 1

For newer versions of Net::SSH, you can just pass a status hash to Net::SSH::Connection::Session#exec:

status = {}

Net::SSH.start(hostname, user, options) do |ssh|
  channel = ssh.exec(command, status: status)
  channel.wait # wait for the command to actually be executed
end

puts status.inspect
# {:exit_code=>0}

By default, exec streams its output to $stdout and $stderr. You can pass a block to exec to do something different, a la:

ssh.exec(command, status: status) do |ch, stream, data|
  if stream == :stdout
    do_something_with_stdout(data)
  else
    do_something_with_stderr(data)
  end
end

This works on 6.1.0 - not sure about availability for older versions. See http://net-ssh.github.io/net-ssh/Net/SSH/Connection/Session.html#method-i-exec for more details.