$ git diff --stat upstream/master 
 apiserver/spaces/spaces.go             |   4 +-
 provider/maas/constraints.go           | 206 ++++++++++++++++++++++++++++++
 provider/maas/constraints_test.go      | 518 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 provider/maas/environ.go               | 164 ++++--------------------
 provider/maas/environ_whitebox_test.go | 295 +++----------------------------------------
 provider/maas/maas_test.go             |   7 +-
 6 files changed, 770 insertions(+), 424 deletions(-)
aim@spicy:~/go/src/github.com/juju/juju (maas-spaces) (maas19-home)
$ git push -f upstream maas-spaces
Username for 'https://github.com': frobware
Password for 'https://frobware@github.com': 
go version go1.2.1
checking: go fmt ...
checking: go vet ...
checking: go build ...
checking: tests are wired up ...
Counting objects: 56, done.
Delta compression using up to 8 threads.
Compressing objects: 100% (49/49), done.
Writing objects: 100% (56/56), 10.97 KiB | 0 bytes/s, done.
Total 56 (delta 44), reused 9 (delta 7)
To https://github.com/juju/juju.git
 + 11b18d3...7c66b6a maas-spaces -> maas-spaces (forced update)