"simple" builds fail because Buidlbot is not installed

[dustin]

On the win8 builder:

===============================================================================
[ERROR]
Traceback (most recent call last):
  File "C:\Users\Public\buildslave\os-win81\build\master\buildbot\test\integration\test_configs.py", line 39, in test_sample_config
    config.MasterConfig.loadConfig(self.basedir, filename)
  File "C:\Users\Public\buildslave\os-win81\build\master\buildbot\config.py", line 185, in loadConfig
    raise errors
buildbot.config.ConfigErrors: error while parsing config file: Unknown component name: BuildSlave (traceback in logfile)

buildbot.test.integration.test_configs.RealConfigs.test_sample_config
===============================================================================
[ERROR]
Traceback (most recent call last):
  File "C:\Users\Public\buildslave\os-win81\build\master\buildbot\config.py", line 175, in loadConfig
    exec f in localDict
  File "C:\Users\Public\buildslave\os-win81\build\master\buildbot\scripts\sample.cfg", line 18, in <module>
    c['slaves'] = [buildslave.BuildSlave("example-slave", "pass")]
  File "C:\Users\Public\buildslave\os-win81\build\master\buildbot\plugins\db.py", line 238, in __getattr__
    raise AttributeError(str(err))
exceptions.AttributeError: Unknown component name: BuildSlave

buildbot.test.integration.test_configs.RealConfigs.test_sample_config

This builder doesn't use a virtualenv -- in the metabbotcfg, it's a "simple" builder that just assumes the Python prerequisites (Twisted, etc.) are installed and then runs trial.

I suspect the fix is to use a virtualenv, but I remember struggling mightily to make such a thing work several years ago, and finally giving up and falling back to "simple".

[dustin]

I can work on this at some point, but it should be possible for someone else to look at the metabbotcfg repo (​https://github.com/buildbot/metabbotcfg/) and figure out a way to make the VirtualenvSetup? step (​https://github.com/buildbot/metabbotcfg/blob/master/builders.py#L26) work on Windows.

[dustin]

I've had a hard time testing this since the buildslave seems to come on and offline frequently.