[Enhancement]: r/aws_s3_object: Support conditional writes with `if_none_match` argument

[jar-b]

Description

Amazon S3 now supports conditional writes. The AWS provider should enable this option in the corresponding Terraform resources.

Blog: https://aws.amazon.com/about-aws/whats-new/2024/08/amazon-s3-conditional-writes/

Affected Resource(s) and/or Data Source(s)

• aws_s3_object
• aws_s3_bucket_object

Potential Terraform Configuration

resource "aws_s3_object" "example" {
  ### other configuration ###

  if_none_match = "*"
}

References

• Depends on chore(deps): bump the aws-sdk-go group across 2 directories with 4 updates #38957
• https://aws.amazon.com/about-aws/whats-new/2024/08/amazon-s3-conditional-writes/
• https://docs.aws.amazon.com/AmazonS3/latest/API/API_PutObject.html

Would you like to implement a fix?

None

[github-actions]

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[bschaatsbergen]

Leaving this here for consideration — it could be worth also exploring the new conditional write features recently released: Amazon S3 Functionality: Conditional Writes. Though, we should carefully evaluate if it fits within Terraform’s idempotency model.

[AlexisColes]

Our use case for this.

We have an S3 bucket containing the configuration for a shared ALB.

Different teams will create listeners on the ALB by adding a file keyed with the port number.

We want to enable conditional writes for this configuration to prevent one team from overwriting a listener from another team.

We want Terraform to fail if the file already exists in the S3 bucket but not in the state.