terragrunt_validate - fails for folders without terragrunt.hcl

[mhennecke]

Suppose a multi-tier project (dev,stage, prod, etc) where not every folder contains a terragrunt.hcl. Non-module folders will only contain hcl files with some "local" definitions which get inherited from the module folders, e.g.

base.hcl
- tier1
  tier.hcl
  module1
    terragrunt.hcl
- tier2
  tier.hcl
  module1
    terragrunt.hcl

In this setup, terragrunt_validate will fail in folders where it can't find a terragrunt.hcl.

Proposed solution:
Only run terragrunt validate in folders, which contain a terragrunt.hcl

[gchappel]

@antonbabenko - any chance of a review/merge with this? I'm hitting this on a regular basis which means I keep running with SKIP=terragrunt_validate and defeating the point of having the hook. Thank you (and thank you to @mhennecke for providing a solution!)

[github-actions]

This issue has been automatically marked as stale because it has been open 30 days
with no activity. Remove stale label or comment or this issue will be closed in 10 days

[MaxymVlasov]

terragrunt_validate hook runs only in folders with .hcl files

pre-commit-terraform/.pre-commit-hooks.yaml

Lines 80 to 86 in ac9299c

	- id: terragrunt_validate
	name: Terragrunt validate
	description: Validates all Terragrunt configuration files.
	entry: terragrunt_validate.sh
	language: script
	files: (\.hcl)$
	exclude: \.terraform\/.*$

I have no setup with terragrunt right now, to check if it works or not now.
@mhennecke please, confirm that issue still valid for the latest tag (now it v1.62.3) or close this issue.

repos:
- repo: https://github.com/antonbabenko/pre-commit-terraform
  rev: v1.62.3
  hooks:
   - id: terragrunt_validate

Also, if you will use different settings, please share them here

[thetimbecker]

I ran into this same problem with a similar setup. The issue is that validate is not a first-class Terragrunt operation, so it forwards the command to Terraform. By default, when forwarding commands to Terraform, Terragrunt looks for a terragrunt.hcl file. That is why we are running into the issue: terragrunt_validate runs in folders with .hcl files, but fails if there isn't also a terragrunt.hcl file in that directory.

So either the hook needs to only run in directories with terragrunt.hcl like @mhennecke originally said, or the .hcl file needs to be passed as an argument to terragrunt validate when it is run. I think the desired behavior is the former, which I included in this PR: #312

But now I'm wondering if this hook is actually doing what it's meant to. The description says "Validates all Terragrunt configuration files.", but really it's validating Terraform through the Terragrunt wrapper. I am not sure what people are using it for, but personally I think the description should be updated.