Implement AcceptTransitGatewayVpcAttachment API call

[ghost]

This issue was originally opened by @KundK as hashicorp/terraform#20869. It was migrated here as a result of the provider split. The original body of the issue is below.

---

Current Terraform Version

Terraform 0.11.10
AWS provider 2.4.0

Use-cases

When creating a aws_ec2_transit_gateway_vpc_attachment with a shared TGW from another account the attachment goes into 'pendingAcceptance ' state.
It has to be accepted manually on the console or by the AcceptTransitGatewayVpcAttachment API call.
It seems like that API call doesn't have a provider resource.

Attempted Solutions

Proposal

Create data source and resource similar to 'aws_dx_hosted_public_virtual_interface_accepter'

References

https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_AcceptTransitGatewayVpcAttachment.html

[ewbankkit]

For acceptance testing this depends on #7601, #8259 as the transit gateway must be shared to and accepted in the account to which the transit gateway VPC attachment will be made and accepted.

[ewbankkit]

Suggested syntax for a new aws_ec2_transit_gateway_vpc_attachment_accepter resource (modeled on aws_vpc_peering_connection_accepter):

# Creator
resource "aws_ec2_transit_gateway_vpc_attachment" "example" {
...
}

# Accepter
resource "aws_ec2_transit_gateway_vpc_attachment_accepter" "example" {
  provider = "aws.alternate"

  transit_gateway_attachment_id = "${aws_ec2_transit_gateway_vpc_attachment.example.id}"
}

The exported attributes would be the attributes of the aws_ec2_transit_gateway_vpc_attachment resource:

• transit_gateway_id
• vpc_id
• vpc_owner_id
• subnet_ids
• dns_support
• ipv6_support

[bflad]

Hi folks 👋 A new aws_ec2_transit_gateway_vpc_attachment_accepter resource has been merged and will release with version 2.13.0 of the Terraform AWS Provider, likely later this week. 👍

[bflad]

This has been released in version 2.13.0 of the Terraform AWS provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. Thanks!