Indent function in template file failed to render

[hashibot]

This issue was originally opened by @sebastien-prudhomme as hashicorp/terraform#16775. It was migrated here as a result of the provider split. The original body of the issue is below.

---

Terraform Version

Terraform v0.11.0 and Terraform v.0.10.8

Terraform Configuration Files

resource "tls_private_key" "ca" {
  algorithm = "RSA"
  rsa_bits  = "2048"
}

data "template_file" "config-yaml" {
  template = "${file("${path.module}/config.yaml.tpl")}"

  vars {
    ca_rsa_private = "${tls_private_key.ca.private_key_pem}"
  }
}

config.yaml.tpl:

ca_rsa_private: |
  ${indent(2, ca_rsa_private)}

Expected Behavior

No error

Actual Behavior

Got this error:

failed to render : 2:5: unknown function called: indent

Important Factoids

If i use the indent function directly in the TF file, it works fine.

data "template_file" "config-yaml" {
  template = "${file("${path.module}/config.yaml.tpl")}"

  vars {
    ca_rsa_private = "${indent(2, tls_private_key.ca.private_key_pem)}"
  }
}

config.yaml.tpl:

ca_rsa_private: |
  ${ca_rsa_private}

[RomanHotsiy]

Was able to work around this issue using replace, i.e.:

ca_rsa_private: |
  ${indent(2, ca_rsa_private)}

becomes:

ca_rsa_private: |
  ${replace(ca_rsa_private, "\n", "\n  ")} # <-- 2 spaces here

For some reason, replace is available in the template file context while indent is not.