The CheckoutBot is used to convert Git repositories back to Mercurial. To keep track of conversion state, it uses a "marks" repository. Each instance of the bot is currently storing it's own copy of the marks repository in the scratch directory, which is starting to waste a lot of disk space for us. This happens because the marks repository is stored in a directory named after the target hg repository for the conversion config. I think it would make more sense to name the marks repository clone after the name of the marks repository instead.