[Twisted-Python] Script which uploads coverage results to codecov failed, but reported success?

Hi,

For this pull request:

https://github.com/twisted/twisted/pull/284

This Windows build ran and tried to upload coverage results to codecov:

https://buildbot.twistedmatrix.com/builders/windows7-64-py2.7-coverage/build...

but failed with this:

Error: 403 Client Error: Forbidden for url: https://codecov.s3.amazonaws.com/v4/raw/2016-07-01/BB05435E28F8047E9B3D49B4B...

The upload failed, but the buildbot job reported success.

The result was that patch shows 57% coverage, when it should be 100%. Is there a way to make that buildbot step fail if the upload to codecov fails?

I don't know where the script for that is.

-- Craig