option to discard certain .tf file to a terragrunt unit instantantiation

[frank-helloworld]

use case is a terraform module needs to handle both existing and new infrastructure.
There is an import.tf to handle existing infrastructure, but including this import.tf will fail for new infrastructure.

Is there some techniques that can be applied at terragrunt side to not include certain .tf file for a referenced module ?

can hooks be used to do this ?

[yhakbar]

Hey @frank-helloworld !

Yes, you can use a before_hook to achieve this.

[frank-helloworld]

Thank you @yhakbar .

from the doc, I understand i can run a generic command.
I'm wondering how I could process the files specific to this terraform module in the local terragrunt cache.

Say I reference a github link for the terraform module, how I could modify the files that's used in the local terragrunt cache and remove the import.tf.

any hints are greatly appreciated 🙏

[yhakbar]

  before_hook "remove_import_tf" {
    commands     = ["apply", "plan"]
    execute      = ["rm", "-f", "import.tf"]
  }

This is something I would expect to work ^. Have you tried anything like that?

[frank-helloworld]

I see, in this case, the working directory would have already been switched to the TG cache directory.
I also just saw there is a "TG_CTX_TF_PATH" context which may be helpful if this doesn't work.

The example in the doc was showing a generic echo command.

will try it out. Thanks again!

UPDATE: this works :)