NativeSsh, improve user experience for connection failures

[pniederlag]

Q	A
Issue Type	Feature Request
Deployer Version	4.2.1
Local Machine OS	N/A
Remote Machine OS	N/A

Description

As suggested I switched to the native ssh connection via set('ssh_type', 'native')

When I do have an error in the setup that prevents a succesfull (ssh-)connection the error shown for the native-ssh implementation is very irritating.

Steps to reproduce

• add some invalid server configuration
• try to run an arbitrary task on this server
• EXCEPTION [RuntimeException]
  Unable to login with the provided credentials is clear to me.
• switch to native ssh implementation as the warning suggests
• EXCEPTION: [Symfony\Component\Process\Exception\ProcessFailedException] is irritating for me

Content of deploy.php

// compat with php < 5.6
namespace Deployer;

use Symfony\Component\Console\Input\InputArgument;

//
require 'recipes/rsync.php';

argument('stage', InputArgument::OPTIONAL, 'Run tasks only on this server or group of servers');

//set('ssh_type', 'native');
//set('ssh_multiplexing', true);

// Configuration
serverList('servers.yml');

desc('Say Hello');
task('say_hello', function () {
     writeln('Hello');
     run("pwd");
});%  

[antonmedv]

Done.