`ok` was not assigned when type casting to `map[string]interface{}` so the
subsequent check was testing a stale value.
Also, the error message upon failure had the wrong sense.
Signed-off-by: Ian Campbell <ian.campbell@docker.com>
Implementing a String() interface for each provider makes it
easier for users to prefix log strings with the provider.
Signed-off-by: Rolf Neugebauer <rolf.neugebauer@docker.com>
This package handles meta and user data for different cloud
and other platforms. It should be easy to extend to new
platforms.
Currently, it handles GCP metadata and a simple CDROM userdata
provider.
Signed-off-by: Rolf Neugebauer <rolf.neugebauer@docker.com>
