Terraform Import of map resources

Question

I've got a map variable that identifies existing s3 buckets:

resource "aws_s3_bucket" "bucket" {
  for_each = var.s3_replication
  bucket   = each.value.source
  #other configuration
}

variable "s3_replication" {
  description = "Map of buckets to replicate"
  type        = map
  default = {
    logs = {
      source = "logs_bucket",
      destination = "central_logs_bucket"
    },
    security = {
      source = "cloudtrail_bucket",
      destination = "central_security_bucket"
    }
  }
}

Since these buckets already exist, I am trying to import them and then apply the a configuration to them to update the resources. Unfortunately, I am not able to figure out how to do a terraform import on these. I've tried:

terraform import aws_s3_bucket.bucket["logs"] logs_bucket
terraform import aws_s3_bucket.bucket[logs] logs_bucket
terraform import aws_s3_bucket.bucket[0] logs_bucket
terraform import aws_s3_bucket.bucket[0].source logs_bucket
terraform import aws_s3_bucket.bucket[0[source]] logs_bucket

All failing with a different error. Any idea on how to import existing resources listed on a map?

Answer 1

The terraform import subcommand relies on strings in the map key within resource namespaces that are first class expression, and this causes issues with shell interpreters where the resource is not a first class expression because they are not the Terraform DSL. You can work around this by casting the entire resource name as a literal string:

terraform import 'aws_s3_bucket.bucket["logs"]' logs_bucket

and this will resolve your issue.