CODEWITHSUNDEEP
amazon-web-servicesterraform
user2175783
user2175783

Reputation: 1441

How to use value from bash script when creating resource via terraform

This is a generic workflow terraform question (I am a terraform beginner).

I need to create a new aws resource via terraform. The structure I have is

resource "some_aws_resource" "resource_name" {
   name = var.resource_name
   role_name = var.role_name

   another_key = another_value
}

The value another_value is derived from vars entered by the user through a bash script find_another_value.sh for example

resource "null_resource" "find_another_value" {
   provisioner "local-exec" {
      command     = "shell_scripts/find_another_value.sh"
    interpreter = ["/bin/bash"]
    working_dir = path.module

    environment = {
      DAR = var.aws_dar
      RAD = var.aws_rad
    }
   }

}

should return another_value

How do I pass the output another_value of the null_resource to the first resource and make sure that the non null resource waits until the null_resource returns the value?

The find_another_value.sh script will use the input variables to query aws via the aws cli to find the value it needs to return.

If there is a better/easier way that would also be good to know.

Upvotes: 0

Views: 776

Answers (1)

eliya
eliya

Reputation: 19

For waiting you will use depends_on = []

resource "some_aws_resource" "resource_name" {
   depends_on =[null_resource.find_another_value]
   name = var.resource_name
   role_name = var.role_name
   another_key = another_value.value
}

To extract value from a resource We will write a resource out We will add value Edit the resource then the name and then the line we want its value

output "another_value" {

  description = "another_value from null resource find_another_value ."

  value = null_resource.find_another_value.provisioner "local-exec"
}

Upvotes: 1

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