terraform-external-data-oneliner.tf

terraform-external-data-oneliner.tf

# from https://gist.github.com/alastairmccormack/a8c290738145f1c94a86029aca66cb8e
# branch name accessible via: ${data.external.git-branch.result.branch}
data "external" "git-branch" {
  program = ["/bin/bash", "-c", "jq -n --arg branch `git rev-parse --abbrev-ref HEAD` '{\"branch\":$branch}'"]
}

# https://stackoverflow.com/questions/70950150/how-to-use-an-aws-cli-command-in-a-terraform-external-data-source
data "external" "json" {
  program = ["sh", "-c", "aws cloudfront list-cloud-front-origin-access-identities | jq -r ' .CloudFrontOriginAccessIdentityList.Items[] | select(.Comment == \"Created for Nackle Shared CF in pprd\") |  {id: .Id}'"] 
}

output "jsonid" {
  value = data.external.json.result["id"]
}

# tf external data onliner to check if bucket exists
# if [[ $(aws s3api head-bucket --bucket $1 2>&1 || true) ]]; then echo '{\"exists\": \"0\"}'; else echo '{\"exists\": \"1\"}'; fi
#
# invoke as: terraform plan -var bucket=<bucket-to-check>

variable "bucket" {
  type = string
}

data "external" "bucket" {
  program = ["bash", "-c", "if [[ $(aws s3api head-bucket --bucket `jq -rM '.bucket'` 2>&1 || true) ]]; then echo '{\"exists\": \"0\"}'; else echo '{\"exists\": \"1\"}'; fi"]
  query = {
    bucket = var.bucket
  }
}

output "bucket-status" {
  value = data.external.bucket.result["exists"]
}

locals {
  bucket_exists = data.external.bucket.result["exists"] == "1" ? 1 : 0
}

output "bucket-flag" {
  value = local.bucket_exists
}