vcs: fix processing of git commands that return output on stderr The subprocessio module used for interfacing with Git is using threading. It might not be fully deterministic. The subprocessio module also had the "feature" that it stopped reading and reported failure once it found output on stderr - even if the command completed (or would complete) with success. Sometimes (like https://drone.io/bitbucket.org/domruf/kallithea/24 ) tests on linux could fail on totally normal informational output like: Couldn't run git command (['git', '-c', 'core.quotepath=false', 'checkout', 'foobranch']). Original error was: Subprocess exited due to an error: Switched to branch 'foobranch' On Windows it would fail even more often. To fix that, ignore stderr while processing output. There is a risk that it in some cases can make the process block on stderr and thus never finish ... but there is no reports of that yet.