[PROPOSAL] Support/Verify Shared Configuration Region

[bflad]

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Description

In the future we may wish to allow region configuration via the AWS shared configuration file (e.g. ~/.aws/config), instead of requiring it via Terraform configuration or environment variables. There may be a few minor adjustments that need to happen to remove direct references to Config.Region, but otherwise the unit testing for GetSession() can theoretically be used to determine this support.

There are caveats to this support though as it can be potentially ambiguous across Terraform executors with varying AWS environment setups, so in the end we may not accept downstream implementations to make the configuration optional.

Potential Library Implementation

// Updates to TestGetSession()

Potential Terraform Backend/Provider Configuration

# Potential future improvements to make the below configurations optional

terraform {
  backend "s3" {
    region = "..."
  }
}

provider "aws" {
  region = ""
}

References

• S3 backend should take region from the profile terraform#15103
• region is not picked up from the AWS profile terraform-provider-aws#7750
• aws provider should recognize region defined in ~/.aws/config file terraform-provider-aws#4503
• Set region of aws provider via profile (i.e. from ~/.aws/config) terraform-provider-aws#1767
• AWS provider should use default region set in ~/.aws/config/  terraform-provider-aws#687
• Terraform access to AWS credentials when using profiles terraform-provider-aws#204
• AWS Provider: support ~/.aws/config terraform-provider-aws#186

[gdavison]

Support has been added to v2 of aws-sdk-go-base