[terragrunt] How can you conditionally include a provider in a generate block?

[yorinasub17]

I'm aiming to consolidate all providers here, however I have one provider that requires authentication against a remote source to work. This provider has very limited use and I wouldn't want to authenticate against every run. However if I could conditionally include this provider based on the use of certain modules that would be ideal.

[yorinasub17]

You can do this by using string template directives. For example:

locals {
  # Assuming you have a folder structure like ACCOUNT/REGION/ENV, you can have a 
  # region.hcl file like ACCOUNT/REGION/region.hcl to dynamically change what gets loaded here.
  region_vars = read_terragrunt_config(find_in_parent_folders("region.hcl"))
}

generate "provider" {
  path = "provider.tf"
  if_exists = "overwrite_terragrunt"
  contents = <<EOF
provider "aws" {
  alias = "us-east-1"
  region = "us-east-1"
}

%{ if local.region_vars.locals.region == "us-west-1" }
provider "aws" {
  alias = "us-west-1"
  region = "us-west-1"
}
%{ endfor }
EOF
}

[paololazzari]

I had a provider (helm) which I wanted to create only in one module (helm), so I simply leveraged the module name and used that as the condition, e.g.:

locals {
  module_name = get_terragrunt_dir()
}

generate "provider" {
  path      = "provider.tf"
  if_exists = "overwrite_terragrunt"
  contents = <<EOF
provider "google" {
    project        = "..."
    region         = "..."
}

%{if endswith(local.module_name, "helm")}
provider "helm" {
  kubernetes {
    config_path = "~/.kube/config"
  }
}
%{endif}
EOF
}