terragrunt validate not working with root.hcl

[sirantd]

Describe the bug

There is a new recommendation to use root.hcl for the root Terragrunt file, but it breaks terragrunt validate (which I run as a pre-commit hook).

Steps To Reproduce

Rename terragrunt.hcl according to instructions

➜ terragrunt validate
20:05:52.682 INFO   Terragrunt Cache server is listening on 127.0.0.1:60287
20:05:52.683 INFO   Start Terragrunt Cache server
20:05:52.683 INFO   Shutting down Terragrunt Cache server...
20:05:52.684 INFO   Terragrunt Cache server stopped
20:05:52.684 ERROR  stat ./terragrunt.hcl: no such file or directory
20:05:52.684 ERROR  Unable to determine underlying exit code, so Terragrunt will exit with error code 1

Workaround

Place empty terragrunt.hcl in the root directory next to root.hcl

Versions

• Terragrunt version: 0.71.1
• OpenTofu/Terraform version: doesn't matter
• Environment details (Ubuntu 20.04, Windows 10, etc.): MacOsX 15.2

[yhakbar]

Hey @sirantd ,

Could you give me more details on how you're setting things up?

$ eza -T
.
├── root.hcl
├── unit1
│   ├── main.tf
│   └── terragrunt.hcl
├── unit2
│   ├── main.tf
│   └── terragrunt.hcl
└── unit3
    ├── main.tf
    └── terragrunt.hcl

fd -tf -x bash -c 'echo "# {}" && cat {} && echo'
# ./root.hcl

# ./unit1/main.tf

# ./unit1/terragrunt.hcl
include "root" {
        path = find_in_parent_folders("root.hcl")
}

# unit1
$ terragrunt validate
09:21:31.470 INFO   tofu: Initializing the backend...
09:21:31.470 INFO   tofu: Initializing provider plugins...
09:21:31.470 INFO   tofu: OpenTofu has been successfully initialized!
09:21:31.470 INFO   tofu:
09:21:31.470 INFO   tofu: You may now begin working with OpenTofu. Try running "tofu plan" to see
09:21:31.470 INFO   tofu: any changes that are required for your infrastructure. All OpenTofu commands
09:21:31.470 INFO   tofu: should now work.
09:21:31.470 INFO   tofu: If you ever set or change modules or backend configuration for OpenTofu,
09:21:31.470 INFO   tofu: rerun this command to reinitialize your working directory. If you forget, other
09:21:31.470 INFO   tofu: commands will detect it and remind you to do so if necessary.
09:21:31.489 STDOUT tofu: Success! The configuration is valid.