terraform-validate doesn't work when modules are used.

[arianvp]

It always errors with:

+ /nix/store/jyxapkyfpi53p30x9kg4aqj66195bj43-opentofu-1.8.4/bin/tofu validate examples/nix-store-path
╷
│ Error: Module not installed
│ 
│   on examples/nix-store-path/main.tf line 36:
│   36: module "nixos_deploy_document" {
│ 
│ This module is not yet installed. Run "tofu init" to install all modules required by this configuration.
╵
+ read dir

[sestrella]

I ran into the same issue; I believe this occurs mainly when running tofu validate on a project that was initialized with terraform init. However, IMHO, Terraform users should not be forced to use OpenTofu and vice versa; perhaps a better option would be to make both terraform-validate and terraform-format hooks support both Terraform and OpenTofu, or to add separate hooks for each.

Regarding the first option, I believe something similar to #419 should work within the scope of the terraform-validate hook. This should give users the flexibility to use Terraform or OpenTofu:

hooks = {
  terraform-validate = {
    enable = true;
    package = pkgs.opentofu # or pkgs.terraform
  };
}