Can't add metadata / startup script to compute_instance from terragrunt.

[Om-Jumaili]

Hello Everyone, Sorry if this is obvious or if it's been answered before, I looked far and wide for an answer but I couldn't find anything.

I used terragrunt to import the instance_template, and now I'm trying to import the compute_instance, and everything works save for not being able to define a startup script for each instance I'm trying to create.

I know I can define a startup script for the template, but I need different startup scripts for each compute_instance, and I can't find the input I need for the compute_instance module.

Here is my Instance_template:

include "root" {
  path   = find_in_parent_folders()
  expose = true
}

terraform {
  source = "git::https://github.com/terraform-google-modules/terraform-google-vm.git//modules/instance_template?ref=v12.1.2"
}

inputs = {
  project_id               = include.root.locals.project_id
  region                   = include.root.locals.region
  network                  = include.root.locals.network_name
  subnetwork               = "dev-private"
  subnetwork_project      = include.root.locals.project_id
  tags                     = ["terragrunt-temp"]
  disk_type                = "pd-standard"
  disk_labels              = {environment = "dev"}
  disk_size_gb             = 100
  source_image             = "projects/ubuntu-os-cloud/global/images/ubuntu-2404-noble-amd64-v20241115"
  machine_type             = "e2-standard-2"
  service_account          = {
    email = "*****"
  }
}

and here are the configurations I tried for compute_instance:

include "root" {
    path = find_in_parent_folders()
    expose = true
}
terraform {
    source = "git::https://github.com/terraform-google-modules/terraform-google-vm.git//modules/compute_instance?ref=v12.1.1"
}

inputs = {
    project_id                      = include.root.locals.project_id
    hostname                        = "terragrunt-clam-av"
    network                         = include.root.locals.network_name
    network_tier                    = "STANDARD"
    subnetwork                      = dependency.Instance_Template.inputs.subnetwork
    subnetwork_project              = dependency.Instance_Template.inputs.subnetwork_project
    region                          = include.root.locals.region
    zone                            = include.root.locals.Zone
    static_ips                      = ["10.10.20.2"]
    instance_template               = dependency.Instance_Template.outputs.self_link
    service_account                 = dependency.Instance_Template.inputs.service_account
    access_config                   = [{
      nat_ip = null
      network_tier = "STANDARD"
    }]
    metadata={ 
startup-script = <<-EOT
        #!/bin/bash
        apt-get update
        apt-get upgrade -y
        touch /iwashere.txt
      EOT
    }
}

dependency "Instance_Template" {
  config_path  = "../Instance_Template"
  skip_outputs = false
}

include "root" {
    path = find_in_parent_folders()
    expose = true
}
terraform {
    source = "git::https://github.com/terraform-google-modules/terraform-google-vm.git//modules/compute_instance?ref=v12.1.1"
}

inputs = {
    project_id                      = include.root.locals.project_id
    hostname                        = "terragrunt-clam-av"
    network                         = include.root.locals.network_name
    network_tier                    = "STANDARD"
    subnetwork                      = dependency.Instance_Template.inputs.subnetwork
    subnetwork_project              = dependency.Instance_Template.inputs.subnetwork_project
    region                          = include.root.locals.region
    zone                            = include.root.locals.Zone
    static_ips                      = ["10.10.20.2"]
    instance_template               = dependency.Instance_Template.outputs.self_link
    service_account                 = dependency.Instance_Template.inputs.service_account
    access_config                   = [{
      nat_ip = null
      network_tier = "STANDARD"
    }]
    metadata_startup_script  = <<-EOT
        #!/bin/bash
        apt-get update
        apt-get upgrade -y
        touch /iwashere.txt
      EOT
    }

dependency "Instance_Template" {
  config_path  = "../Instance_Template"
  skip_outputs = false
}

include "root" {
    path = find_in_parent_folders()
    expose = true
}
terraform {
    source = "git::https://github.com/terraform-google-modules/terraform-google-vm.git//modules/compute_instance?ref=v12.1.1"
}

inputs = {
    project_id                      = include.root.locals.project_id
    hostname                        = "terragrunt-clam-av"
    network                         = include.root.locals.network_name
    network_tier                    = "STANDARD"
    subnetwork                      = dependency.Instance_Template.inputs.subnetwork
    subnetwork_project              = dependency.Instance_Template.inputs.subnetwork_project
    region                          = include.root.locals.region
    zone                            = include.root.locals.Zone
    static_ips                      = ["10.10.20.2"]
    instance_template               = dependency.Instance_Template.outputs.self_link
    service_account                 = dependency.Instance_Template.inputs.service_account
    access_config                   = [{
      nat_ip = null
      network_tier = "STANDARD"
    }]
    instance_metadata={ 
startup-script = <<-EOT
        #!/bin/bash
        apt-get update
        apt-get upgrade -y
        touch /iwashere.txt
      EOT
    }
}

dependency "Instance_Template" {
  config_path  = "../Instance_Template"
  skip_outputs = false
}

any help is highly appreciated, Thank you.