Buildbot steps for integration with saucelabs
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Sauce Buildbot Integration

We were really excited to start using Saucelabs and set out to integrate it into our standard CI. We initially used a manually backgrounded sauceconnect which we killed at the end. However a lot of projects would need this so we decided to package it up.

The package provides buildbot steps for using the Saucelabs service, including a wrapper for sauce_connect and a test runner for summarising the test results.

Starting a Sauce Tunnel

As well as providing a simple wrapper around the sauce_connect script this step will block until a tunnel has been correctly established. It will also transfer sauce_connect to the slave if its not available. We try to avoid duplicating support scripts to project repositories or adding manual setup steps to slave setup.

To start a tunnel you use the StartSauceTunnel step:

from isotoma.buildbot.sauceconnect import StartSauceTunnel

Running Tests

You can run tests however you like, but if you want to make the test results available from buildbot and available to people without your master saucelabs password you will need some integration machinery.

The SauceTests step processes the logs from the test run and attaches a HTML summary with access to images and videos of the test run. You can use it like so:

from isotoma.buildbot.sauceconnect import SauceTests
    logfiles={"sauce.log": "sauce.log"},

It's expected that sauce.log will contain a list of tests, saucelab session ids and the outcome of the test run. The relevant logs are fetched from saucelabs and parsed. A summary with swishy ajax screenshot browsing and embedded videos is generated and attached to the buildbot log.

This process is currently very limited: because it relies on saucelabs to host the media it leaks your username/api-key and violates security restrictions in firefox. To get around this we'll need to store the output images and videos ourselves. This is coming in the near future, but until then it works just fine with Google Chrome.

Stopping a Sauce Tunnel

You'll want to stop the tunnel at the end of a build. Here's how:

from isotoma.buildbot.sauceconnect import StopSauceTunnel

It will run even if there are failures earlier in the build to make sure there are no stale tunnels left.

Using With Buildbot

If you want to use these buildbot steps in a buildbot managed with buildout you can just add it to the eggs list:

recipe = isotoma.recipe.buildbot
cfgfile = master.cfg
eggs =


This software is available from our repository on github.


Copyright 2010 Isotoma Limited

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

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