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Subnet information is only really needed when the specified `vpc_id` is
not the default VPC for the region where the builder is being executed.
This change uses the AWS API to determine if the VPC provided is a
non-default VPC and only validates the existence of a `subnet_id` if a
user has provided a non-default `vpc_id`.
Tests after change
```
> make test TEST=./builder/amazon/... TESTARGS='-count=1 -v -run=TestStepPreValidate_checkVpc'
...
=== RUN TestStepPreValidate_checkVpc
=== RUN TestStepPreValidate_checkVpc/DefaultVpc
=== RUN TestStepPreValidate_checkVpc/NonDefaultVpcNoSubnet
=== RUN TestStepPreValidate_checkVpc/NonDefaultVpcWithSubnet
=== RUN TestStepPreValidate_checkVpc/SubnetWithNoVpc
=== RUN TestStepPreValidate_checkVpc/NoVpcInformation
--- PASS: TestStepPreValidate_checkVpc (0.00s)
--- PASS: TestStepPreValidate_checkVpc/DefaultVpc (0.00s)
--- PASS: TestStepPreValidate_checkVpc/NonDefaultVpcNoSubnet (0.00s)
--- PASS: TestStepPreValidate_checkVpc/NonDefaultVpcWithSubnet (0.00s)
--- PASS: TestStepPreValidate_checkVpc/SubnetWithNoVpc (0.00s)
--- PASS: TestStepPreValidate_checkVpc/NoVpcInformation (0.00s)
PASS
...
```
|
||
|---|---|---|
| .. | ||
| builder.go | ||
| builder_test.go | ||
| step_bundle_volume.go | ||
| step_register_ami.go | ||
| step_upload_bundle.go | ||
| step_upload_x509_cert.go | ||