terraform-provider-assert

Custom provider to enable assert like functionality in terraform.

Example usage:
Throw exception if user is not using workspaces ( current workspace is default )
main.tf

data "assert_test" "workspace" {
    test = terraform.workspace != "default" // must return TRUE or FALSE
    throw = "default workspace is not valid in this project" // must be of type string
}

there is no need to explicitly initialize provider in your .tf files with the provider "name" {} block, just use data source directly.

dynamic vs static variables in test condition

Terraform validates values at two stages:

• during validation ( static variables passed to terraform or computed during validation )
• during apply ( dynamic variables known after resource is created )

terraform-provider-assert works in both stages, however, if you pass condition based on value computed from resource data it will only throw during apply stage.

Installation

Terraform reads the custom provider binaries from two locations:

• current location where terraform main.tf is run from
• and
  • %APPDATA%\terraform.d\plugins\windows_amd64 on Windows
  • ~/.terraform.d/plugins/darwin_amd64 on Mac
  • ~/.terraform.d/plugins/linux_amd64 on Linux

Place the binary in plugins directory for your platform and run terraform init in your project to load custom plugin configuration.