The goal of this library is to provide the sandboxing functionality that is
already present in the build tools Morph and YBD. We want this new library
to be usable without depending on linux-user-chroot, so that it can be used
on Mac OS X, and hopefully other platforms too.
A longer term goal is to become a useful, generic, cross-platform tool for
running commands in an environment that is partially isolated from the host
system in some way.
The library is implemented in Python currently. This is mostly because it is
an adaptation of existing Python code, not because of any desire to exclude
other languages. Maybe we could rewrite it as a C library with Python bindings.