nixform

define terraform infrastructure in Nix

Terraform by Hashicorp is a great tool with a meh language. Fixed.

Installation

First, install nix. Then,

# install nixform (and deps)
nix-env -i -f "https://github.com/brainrape/nixform/archive/master.tar.gz"

Usage

Create a file like example.tf.nix containing a nix expression that evaluates to a set that looks like terraform's json format:

letlib=(import<nixpkgs>{}).lib;tpls=lib.mapAttrs(name: lib.recursiveUpdate{tags.name=name;ami="ami-0d729a60";instance_type="t2.nano";});in{provider.aws.region="us-east-1";resource.aws_instance=tpls{one={};two={tags.description="Second!";instance_type="t2.micro";};};}

Then use nixform instead of terraform.

nixform apply

How?

Before running terraform with the given arguments, *.tf.nix is evaluated strictly and output in terraform json format. The above example will produce an example.tf.json like this:

{
"provider": {
"aws": {
"region": "us-east-1"
}
},
"resource": {
"aws_instance": {
"one": {
"ami": "ami-0d729a60",
"instance_type": "t2.nano",
"tags": {
"name": "one"
}
},
"two": {
"ami": "ami-0d729a60",
"instance_type": "t2.micro",
"tags": {
"description": "Second!",
"name": "two"
}
}
}
}
}