Terragrunt Errors

Introduction

• Below is the list of common Terragrunt Errors and Solutions.

1. Dependency Error

   • Error:

        Module ./aks has external dependency ../../entraid/resources/group
       Should Terragrunt apply the external dependency? (y/n)
     

   • Cause:
     • The AKS module was dependent on other modules and terragrunt was requesting confirmation before running ‘apply’.
     • The command terragrunt init was executed using a pipeline was there no way to provide a confirmation in the runner.
   • Solution:
     • Added the ‘–terragrunt-non-interactive’ parameter for the terragrunt command
2. Operating System Mismatch

   • Error:

       Error running hook tflint with message: exec: "echo": executable file not found in %PATH% prefix=
     

   • Cause:

     • The before_hook for terraform was configured on run using the default shell on the linux operating system.
     • The error was generated while executing the code on Powershell.

     • Code causing the error:

         terraform {
             before_hook "tflint" {
                 commands     = ["init"]
                 execute      = ["echo"]
                 run_on_error = false
             }
         }
       

     • Solution:
       • Changed the code to use CMD as the default shell for execution.

         terraform {
             before_hook "tflint" {
                 commands     = ["init"]
                 execute      = ["cmd", "/c", "echo", "Running tflint"]
                 run_on_error = false
             }
         }