Hello,

This might be a bug, but I thought I'd post here before putting it on 
GitHub, just in case I'm doing something wrong.

According the docs, the accelerator_type just needs to include part of the 
type URL:

accelerator_type 
> <https://www.packer.io/docs/builders/googlecompute.html#accelerator_type> 
> (string) 
> - Full or partial URL of the guest accelerator type. GPU accelerators can 
> only be used with"on_host_maintenance": "TERMINATE" option set. Example: 
> "projects/project_id/zones/europe-west1-b/acceleratorTypes/nvidia-tesla-k80"



Below is my packer.json file. This one fails with the error below.


{
  "builders": [{
    "type": "googlecompute",
    "project_id": "project-78689",
    "zone": "us-east1-c",
    "source_image_family": "ubuntu-1804-lts",
    "ssh_username": "packer",
    "image_name": "wowza-gpu-{{timestamp}}",
    "on_host_maintenance": "TERMINATE",
    "accelerator_type": "nvidia-tesla-k80",
    "accelerator_count": 1
  }],
}


==> googlecompute: Error creating instance: googleapi: Error 400: Invalid 
value for field 'resource.guestAccelerators[0].acceleratorType': 
'nvidia-tesla-k80'. The URL is malformed., invalid
Build 'googlecompute' errored: Error creating instance: googleapi: Error 400
: Invalid value for field 'resource.guestAccelerators[0].acceleratorType': 
'nvidia-tesla-k80'. The URL is malformed., invalid


If I modify the packer.json file to include the full URL for the GPU, it 
builds properly.

{
  "builders": [{
    "type": "googlecompute",
    "project_id": "project-78689",
    "zone": "us-east1-c",
    "source_image_family": "ubuntu-1804-lts",
    "ssh_username": "packer",
    "image_name": "wowza-gpu-{{timestamp}}",
    "on_host_maintenance": "TERMINATE",
    "accelerator_type": 
"https://www.googleapis.com/compute/v1/projects/project-78689/zones/us-east1-c/acceleratorTypes/nvidia-tesla-k80";
,
    "accelerator_count": 1
  }],
}


Am I missing something, or is this a bug I should report on GitHub?  I've 
tried multiple regions and zones, all of which include the GPU I'm trying 
to use and all fail with the same error.

Kerry

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