Code review comment for lp://staging/~rogpeppe/juju-core/281-set-xe

*** Submitted:

environs/cloudinit: fail properly in cloudinit

If one command fails, we should not carry on and
try more. We also cause the executing commands to
be printed, so it should be more obvious which command
caused the script to fail.

R=dimitern, fwereade
CC=
https://codereview.appspot.com/8661043

https://codereview.appspot.com/8661043/