Write all log messages to WORKSPACE/build.log
Add a logpipe function, too, to capture program output
Move partitioning/formatting plugins out of OSes and into targets

That's where they damned well should have been in the first place.
Fix default apt-mirror list
Fix --plugin option parsing
Only log after we've got a WORKSPACE, and new logtee function

Logging to $WORKSPACE/build.log doesn't work so well when you haven't setup
$WORKSPACE yet, leading to all sorts of nasssssty shenanigans.
Puppet package plugin

Perfect presentation of Puppet performance, without prior planning.
Basic LXC target configuration

This requires some tooling on the LXC server to actually support this format,
which is purely and simply just a tarball of the rootfs, but it's a start.