No More Forks: Policy Transformation for Terraform at Scale

Every org enforcing Terraform standards eventually hits the same wall: policy tools can flag issues, but they cannot fix module code. The result is a graveyard of forked modules that drift from upstream and turn upgrades into a full-time job. This talk introduces policy transformation: automatically rewriting Terraform modules at download time so teams get compliant code without maintaining forks.

I will demo eight real transformation rules across four categories: lifecycle management (prevent_destroy, ignore tag drift, protect KMS keys), block removal (strip provisioners), attribute restriction (deny GPU or specialty instances), and content sanitization (safe regex cleanups). You will see the before-and-after HCL, plus the safety model that makes this production-ready: deterministic outputs, collision detection, preview diffs, and a four-level risk classification.

You will leave with a practical decision framework for validate vs transform, a DIY toolkit using pre-commit, hclwrite, custom tflint rules, and plan validation, and a simple migration path from module forks to rule-based enforcement. No vendor account required to apply the patterns from this talk.