Improve error handling when RubyGems.org is offline #246
Description
On a new install (sudo gem install travis) just now, while RubyGems.org had an outage the CLI was unusable, with rather substandard error behavior:
$ travis encrypt FOO=bar
757: unexpected token at '<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<link rel="shortcut icon" href="/favicon.ico" type="image/x-icon">
<link href="/stylesheets/reset.css" media="screen" rel="stylesheet" type="text/css" />
<link href="/stylesheets/960.css" media="screen" rel="stylesheet" type="text/css" />
<link href="/stylesheets/screen.css" media="screen" rel="stylesheet" type="text/css" />
<!--[if IE 7]>
<link href="/stylesheets/ie7.css" media="screen" rel="stylesheet" type="text/css" />
<![endif]-->
<title>under maintenance | RubyGems.org</title>
</head>
<body>
<div class="container_12">
<div class="prefix_1 grid_4 header">
<h1><a href="/" title="Home">RubyGems.org</a></h1>
</div>
<div class="grid_6 suffix_1 nav">
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
</div>
<div class="prefix_1 grid_10 suffix_1 main">
<div class="info">
<div class="title">
<h2>Under maintenance</h2>
<h3>I'm having a good time... *not*!</h3>
</div>
<p>We'll be back to 100% soon. Some long migration or fixes are being put in place. Hold on!</p>
<p>Please checkout <a href="http://twitter.com/rubygems_status">@rubygems_status</a> and <a href="http://status.rubygems.org/">status.rubygems.org</a> for more real-time status updates.</p>
<p>While you wait...</p>
<p style="text-align: center">
<iframe width="420" height="315" src="http://www.youtube.com/embed/g4ouPGGLI6Q" frameborder="0" allowfullscreen></iframe>
</p>
</div>
</div>
<div class="prefix_1 grid_10 suffix_1 footer">
<div class="links">
</div>
</div>
</div>
</body>
</html>'
Later, once RubyGems.org changed from "under maintenance" to "Server Error", we also observed this output:
$ travis encrypt FOO=bar
undefined method `split' for nil:NilClass
for a full error report, run travis report
The CLI started behaving normally once RubyGems.org came back. Unfortunately, nothing useful captured in travis report:
$ travis report
System
Ruby: Ruby 1.9.3-p0
Operating System: Ubuntu 12.04
RubyGems: RubyGems 1.8.11
CLI
Version: 1.7.4
Plugins: none
Auto-Completion: no
Last Version Check: 2014-11-14 22:51:55 +0000
Session
API Endpoint: https://api.travis-ci.org/
Logged In: no
Verify SSL: yes
Enterprise: no
Endpoints
org: https://api.travis-ci.org/ (current)
cc: @lisp