docker.image resource redux

[ryane]

This allows you to ensure a docker image exists on the host.

docker.image "busybox" {
  name = "busybox"
  tag = "latest"
  timeout = "60s"
}

Future Enhancements?

• force pull
• private registry support
• configurable docker client
• should we be able to ensure a docker image does NOT exist on the host?
• blackbox test? would this be possible with wercker?
• showing progress. docker pulls can take a while to run. do we have anything or have we thought about how to show progress of a long running resource in converge?

[rebeccaskinner]

Can we rebase this on top of master?

There is a minor bug in image_test.go due to an API change with resource.TaskStatus, where Changes was renamed HasChanges for the health module, other than that it should be a clean rebase.

[ryane]

done!

[arichardet]

Could you please rebase so all your non-dependency changes are in one commit?

[ryane]

done

[arichardet]

LGTM!