main.tf

# $ cat ./terraform/main.tf
# from https://github.com/NixOS/nixpkgs/pull/99198#issuecomment-720686639
terraform {
  required_providers {
    aws = {
      source = "hashicorp/aws"
    }

    local = {
      source = "hashicorp/local"
    }

    null = {
      source = "hashicorp/null"
    }
  }
}

runlog

$ terraform init ./terraform
Initializing modules...
- xxx in xxx/terraform/xxx

Initializing the backend...

Initializing provider plugins...
- Finding latest version of hashicorp/local...
- Finding latest version of hashicorp/null...
- Finding latest version of hashicorp/aws...
- Installing hashicorp/local v1.4.0...
- Installed hashicorp/local v1.4.0 (unauthenticated)
- Installing hashicorp/null v2.1.2...
- Installed hashicorp/null v2.1.2 (unauthenticated)
- Installing hashicorp/aws v2.65.0...
- Installed hashicorp/aws v2.65.0 (unauthenticated)

The following providers do not have any version constraints in configuration,
so the latest version was installed.

To prevent automatic upgrades to new major versions that may contain breaking
changes, we recommend adding version constraints in a required_providers block
in your configuration, with the constraint strings suggested below.

* hashicorp/aws: version = "~> 2.65.0"
* hashicorp/local: version = "~> 1.4.0"
* hashicorp/null: version = "~> 2.1.2"

Terraform has been successfully initialized!

You may now begin working with Terraform. Try running "terraform plan" to see
any changes that are required for your infrastructure. All Terraform commands
should now work.

If you ever set or change modules or backend configuration for Terraform,
rerun this command to reinitialize your working directory. If you forget, other
commands will detect it and remind you to do so if necessary.

$ terraform apply \
	-state="./xxx/terraform.tfstate" \
	-input=false \
	-var-file="./xxx/terraform.tfvars.json" \
	./terraform

Error: Could not load plugin


Plugin reinitialization required. Please run "terraform init".

Plugins are external binaries that Terraform uses to access and manipulate
resources. The configuration provided requires plugins which can't be located,
don't satisfy the version constraints, or are otherwise incompatible.

Terraform automatically discovers provider requirements from your
configuration, including providers used in child modules. To see the
requirements and constraints, run "terraform providers".

2 problems:

- Failed to instantiate provider "registry.terraform.io/-/aws" to obtain
schema: unknown provider "registry.terraform.io/-/aws"
- Failed to instantiate provider "registry.terraform.io/-/local" to obtain
schema: unknown provider "registry.terraform.io/-/local"

upstream nixpgs rev: 1dc37370c489b610f8b91d7fdd40633163ffbafd

shell.nix

{ pkgs ? import <nixpkgs> { } }:
pkgs.mkShell {
  buildInputs = [
    pkgs.nixfmt
    pkgs.shellcheck
    pkgs.shfmt
    (pkgs.terraform_0_13.withPlugins
      (p: [ p.aws p.template p.external p.null p.local ]))
  ];
}

tree output

.terraform/
├── modules
│   └── modules.json
├── plugin_path
└── plugins
    ├── registry.terraform.io
    │   └── hashicorp
    │       ├── aws
    │       │   └── 2.65.0
    │       │       └── linux_amd64 -> /nix/store/q4nbkyaasmn8hvsch47bxsmmxkh5afwc-terraform-0.13.5/plugins/registry.terraform.io/hashicorp/aws/2.65.0/linux_amd64
    │       ├── local
    │       │   └── 1.4.0
    │       │       └── linux_amd64 -> /nix/store/q4nbkyaasmn8hvsch47bxsmmxkh5afwc-terraform-0.13.5/plugins/registry.terraform.io/hashicorp/local/1.4.0/linux_amd64
    │       └── null
    │           └── 2.1.2
    │               └── linux_amd64 -> /nix/store/q4nbkyaasmn8hvsch47bxsmmxkh5afwc-terraform-0.13.5/plugins/registry.terraform.io/hashicorp/null/2.1.2/linux_amd64
    └── selections.json

13 directories, 3 files

$ which terraform
/nix/store/q4nbkyaasmn8hvsch47bxsmmxkh5afwc-terraform-0.13.5/bin/terraform

$ cat /nix/store/q4nbkyaasmn8hvsch47bxsmmxkh5afwc-terraform-0.13.5/bin/terraform
#! /nix/store/k8p54jg8ipvnfz435mayf5bnqhw4qqap-bash-4.4-p23/bin/bash -e
export NIX_TERRAFORM_PLUGIN_DIR='/nix/store/q4nbkyaasmn8hvsch47bxsmmxkh5afwc-terraform-0.13.5/plugins'
exec "/nix/store/3r5ps634s9n7pcbc35kskjwpkmh3qn1x-terraform-0.13.5/bin/terraform"  "$@"


$ tree /nix/store/q4nbkyaasmn8hvsch47bxsmmxkh5afwc-terraform-0.13.5/plugins
/nix/store/q4nbkyaasmn8hvsch47bxsmmxkh5afwc-terraform-0.13.5/plugins
├── registry.terraform.io
│   └── hashicorp
│       ├── aws
│       │   └── 2.65.0
│       │       └── linux_amd64
│       │           └── terraform-provider-aws_v2.65.0
│       ├── external
│       │   └── 1.2.0
│       │       └── linux_amd64
│       │           └── terraform-provider-external_v1.2.0
│       ├── local
│       │   └── 1.4.0
│       │       └── linux_amd64
│       │           └── terraform-provider-local_v1.4.0
│       ├── null
│       │   └── 2.1.2
│       │       └── linux_amd64
│       │           └── terraform-provider-null_v2.1.2
│       └── template
│           └── 2.1.2
│               └── linux_amd64
│                   └── terraform-provider-template_v2.1.2
├── terraform-provider-aws_v2.65.0
├── terraform-provider-external_v1.2.0
├── terraform-provider-local_v1.4.0
├── terraform-provider-null_v2.1.2
└── terraform-provider-template_v2.1.2

17 directories, 10 files