Add DigitalOcean snapshot Data Source.

[andrewsomething]

This PR adds a data source for DigitalOcean snapshots similar to the aws_ami data source. This allows for referencing user created snapshots when creating a new Droplet or volume.

[andrewsomething]

I'm realizing I'm a bit unclear on the acceptance tests for data sources. I can run them locally, but they're looking at resources on my account. Is there some way I should be creating the resources first, or will the values be updated to reflect resources on the testing account?

[stack72]

Hi @andrewsomething

Yes, the way we usually do it is like this:

https://github.com/hashicorp/terraform/blob/master/builtin/providers/aws/data_source_aws_autoscaling_groups_test.go#L15

Notice i have a config that rolls out the actual resources as a first step, then a follow up that adds the datasource

Paul

[andrewsomething]

@stack72 thanks for the pointer! Though, I guess I'll have to withdraw this for now. Looks like I need to implement a resource to take snapshots before I can implement the data source.

[ghost]

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