AWS Instance block_device Attribute

[buth]

Added the ability to specify block devices for an AWS instance.

block_device {
  device_name = "/dev/sda"
  volume_type = "gp2"
  volume_size = 500
}

[pmoust]

Cool, needed that, a test would go great with it :)

[buth]

Can add!

[sethvargo]

@buth as @pmoust said, it would be great to have a test for this 😄

[buth]

Understood; will code up this afternoon. Thanks for getting back to me!

[buth]

Added a test; I can also rebase this as another pull request.

There are, however, a few significant caveats due to limitations in goamz. The BlockDevice objects of a described EC2 instance do not include the volume which makes it impossible to test for anything other than existence by device name. This leaves out the size, type, snapshot, and encryption status of the new volume, and eliminates the possibility of testing a block_device attribute meant to overwrite a default setting in an AMI (such as the boot device). Checking manually, all of these features work.

Additionally, I had to use a different AMI from the other tests, one that was EBS-backed.

[spyrospph]

If the test is ok and all works fine, can you please merge this. It is a well needed feature.

[armon]

Thanks!