Terraform local-exec command with complex variables

Question

I'd need to iterate through a list of variables in local-exec provider. Is that possible?

variables.tf:

variable "items" {
  default = []
}

main.tf:

resource "null_resource" "loop_list" {
  provisioner "local-exec" {
    interpreter = ["/bin/bash", "-c"]
    command = <<EOF
      for i in ${join(' ', var.items)}
        print $i
      done
EOF
  }
}

I'm just trying to see it in action. I wouldn't think this "pseudocode" could work well on the first try :) — Bernard Halas
– Bernard Halas, Commented Mar 2, 2022 at 9:39
Ok, then: I would probably create a local variable with join and whatever you wanted to achieve. Second step would be to use templatefile to swap the variable you specify in the script with the value of the local variable. The last step would be to run the script instead of providing it with heredoc syntax. But there are sure multiple possible approaches. — Marko E
– Marko E, Commented Mar 2, 2022 at 9:43

theherk · Accepted Answer · 2022-03-02 09:52:42Z

5

You should be able to use environment. Something like this:

variable "items" {
  default = ["item1", "item2"]
}

resource "null_resource" "loop_list" {
  provisioner "local-exec" {
    command     = "for item in $ITEMS; do echo $item >> test-file; done"
    environment = { ITEMS = join(" ", var.items) }
  }
}

Where terraform apply and cat test-file yields:

item1
item2

edited Mar 2, 2022 at 9:52

answered Mar 2, 2022 at 9:43

theherk

7,6173 gold badges32 silver badges62 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Terraform local-exec command with complex variables

1 Answer 1

Comments

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Related