CODEWITHSUNDEEP
terraformterragrunt
YAZ84
YAZ84

Reputation: 95

Terragrunt: get local variable values from certain files down (not up) the directory tree

For this terragrunt directory structure:

project
  environment-dev
    _common
      region
        apps
          app-a
            subenv.hcl
          app-b
            subenv.hcl
          app-c
            subenv.hcl
          ... # other apps can be added in the future
          app-x
            subenv.hcl
    account.hcl

and in each subenv.hcl file there is (among other config) this snipet:

  # tags
  app_tags = {
    "App_tag" = "app-x"
  }

I would like to have in the account.hcl a local variable called app_name which values is input manually but to add a validation for this value, https://developer.hashicorp.com/terraform/language/expressions/custom-conditions#input-variable-validation. This validation to only allow a value for app_name in the account.hcl from the values of App_tag of each subenv.hcl file down the directory tree.
I was thinking to use read_terragrunt_config with 'find_in_parent_folders', https://terragrunt.gruntwork.io/docs/reference/built-in-functions/#read_terragrunt_config but 'find_in_parent_folders' searches up the directory tree and not down; the account.hcl file should get variable values from files which are down the tree and also from all of the files found down the directory tree.
Thank you.

Upvotes: 1

Views: 169

Answers (1)

GeF
GeF

Reputation: 81

You can only use statically defined include configuration block, meaning for every app-n you'll have to add include to your account.hcl.

It would be easier to store app_name constraints higher in the hierarchy and refer it in account.hcl and in subenv.hcls

Upvotes: 0

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