This is actually pretty cool. To answer a question someone might have about "why not just use docker". Docker comes with its own learning curve and concepts. So

This is actually pretty cool. To answer a question someone might have about "why not just use docker". Docker comes with its own learning curve and concepts. Sometimes all you want to do when developing is have an environment in which you can't screw your main machine up. Think of virtualenv in python if you've used it. This might be the equivalent of running docker run -it ubuntu:latest /bin/bash and then developing inside that container. But wait! what ports do you open up? What directories do you mount? And then suddenly you are in docker world. It feels like coffer is just a way to say "hey create me a sandbox where I can mess up things minimally no matter what I install and mess around with". Not sure what files get mounted. Shall try it out in a bit and see how it goes.