sarj-iac-lint
Custom Terraform / IaC lint rules — stdlib only, line/block based, pre-commit-friendly. Mined from recurring infra review comments across the org.
uv tool install sarj-iac-lint
Rules
| Code | Rule | What it flags |
|---|---|---|
| SARJ201 | require-deletion-protection |
A stateful resource (Cloud SQL, GKE, BigQuery, Spanner, AlloyDB, Bigtable, RDS, DynamoDB, ElastiCache, DocumentDB, Neptune, Azure databases, Cosmos DB, ...) without deletion_protection = true. |
| SARJ202 | no-comment-cruft |
Commented-out Terraform/HCL and section-banner / divider comments. |
| SARJ203 | require-prevent-destroy-on-irreplaceable |
An irreplaceable bucket, secret, or artifact registry without an effective provider-side deletion guard or lifecycle { prevent_destroy = true }. |
Terraform safety rules scan .tf files; comment hygiene also scans .hcl and .tfvars. .yaml/.yml
(Helm/k8s/Compose) are scanned by no-comment-cruft for banners only.
Pre-commit
- repo: https://github.com/sarj-ai/standards
rev: iac-v0.6.0
hooks:
- id: sarj-require-deletion-protection
- id: sarj-no-comment-cruft-iac
- id: sarj-require-prevent-destroy-on-irreplaceable
CLI
sarj-iac-lint check --rule require-deletion-protection iac/
sarj-iac-lint list-rules
Diagnostic format is path:line:col: CODE message — Ruff-compatible.
--exit-zero reports without failing (warn mode).
Adoption
All three rules are designed for hard (blocking) adoption; inspect existing findings before enabling them repository-wide.
Variable/expression-gated protection is not proof of protection:
deletion_protection must be a literal
true, or lifecycle { prevent_destroy = true } must be present. Protection
must sit on the resource itself: a flag nested in settings { ... } is the
API-side switch and does not stop terraform destroy.
Memorystore Redis is protected when deletion_protection is omitted; an
explicit false remains unsafe. Current Google resources covered by SARJ201
also accept their documented literal deletion_policy = "PREVENT" guard;
AlloyDB is deliberately excluded because its same-named policy means
DEFAULT/FORCE, not Terraform deletion prevention.
require-prevent-destroy-on-irreplaceable accepts the current Google provider's
literal deletion_policy = "PREVENT" for Cloud Storage buckets, Secret Manager
secrets, and Artifact Registry repositories. Secret Manager also accepts literal
deletion_protection = true. Other values and expressions are not proof of
protection; lifecycle { prevent_destroy = true } remains the portable guard.
The rule also exempts resources explicitly declared disposable with literal
force_destroy = true.
Suppression
Inline # sarj-noqa: SARJ201 — <reason> on the reported line. SARJ201 and
SARJ203 report the resource line.
1 maintainer
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release.yml on sarj-ai/standards
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