GCE deployment failing when non compliant resource name selected

[mdallali]

I was trying to deploy a sample server in GCE.

I have mistakenly put a non compliant machineName to the VM instance resource I am creating
roughly contains this :

machine =
{
deployment.targetEnv = "gce";

  deployment.gce = {
  project = "foo";
  serviceAccount = "foo@gserviceaccount.com";
  accessKey = foo.pem;
  region = "us-east1-b";
  instanceType = "n1-standard-1";
  network = "default";
  machineName = "foo-prod-";
  tags = ["dummy-gce"];
} ;

fileSystems =
[
{ mountPoint = "/data";
autoFormat = true;
fsType = "xfs";
gce.size = 40;
gce.disk_name = "data";
}
}

The deployment failed and logged

$ nixops deploy -d vm-on-gcp
machine1.> creating GCE machine 'foo-prod-'...
error: {u'domain': u'global', u'message': u"Invalid value for field 'resource.name': 'foo-prod-'. Must be a match of regex '(?:a-z?)'", u'reason': u'invalid'}

Corrected the machineName and redeployed, failed again and logged

$ nixops deploy -d vm-on-gcp
error: cannot change the instance name of a deployed GCE machine 'foo-prod-'

Tried to destroy the resources, this has also failed and logged

$ nixops destroy -d vm-on-gcp --confirm --show-trace
error: {u'locationType': u'parameter', u'domain': u'global', u'message': u"Invalid value 'foo-prod-'. Values must match the following regular expression: 'a-z?'", u'reason': u'invalidParameter', u'location': u'instance'}

To work around this I had to destroy the resources from the GCE console. Force delete the deployment and redeploy with the compliant name.

It would be ideal if this get addressed.

Thank you.

[domenkozar]

cc @rbvermaa