WIP: import github resources into terraform

Author: zimbatm

flake.lock

@@ -3,16 +3,23 @@
 
   inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
   inputs.systems.url = "github:nix-systems/default";
-  inputs.treefmt-nix.url = "github:numtide/treefmt-nix";
-  inputs.treefmt-nix.inputs.nixpkgs.follows = "nixpkgs";
+  inputs.treefmt-nix = {
+    url = "github:numtide/treefmt-nix";
+    inputs.nixpkgs.follows = "nixpkgs";
+  };
+  inputs.opentofu-registry = {
+    url = "github:opentofu/registry";
+    flake = false;
+  };
 
   outputs =
     {
       self,
       nixpkgs,
       systems,
       treefmt-nix,
-    }:
+      ...
+    }@inputs:
     let
       eachSystem = f: nixpkgs.lib.genAttrs (import systems) (system: f nixpkgs.legacyPackages.${system});
     in
@@ -22,7 +29,10 @@
           default = pkgs.mkShell {
             packages = [
               pkgs.findutils
+              pkgs.gh
               pkgs.gnumake
+              pkgs.jq
+              (pkgs.callPackage ./tofu { inherit (inputs) opentofu-registry; })
             ];
           };
         }

flake.nix

@@ -0,0 +1,2 @@
+.terraform*
+terraform.tfstate*

tofu/.gitignore

@@ -0,0 +1,66 @@
+# Copyright manveru. https://gist.github.com/manveru/bcd2b4e0d3a30abbdec19573083b34b7
+{
+  fetchurl,
+  go,
+  lib,
+  opentofu,
+  opentofu-registry,
+  stdenv,
+  unzip,
+}:
+let
+  mkTerraformProvider =
+    {
+      owner,
+      repo,
+      version,
+      src,
+      registry ? "registry.opentofu.org",
+    }:
+    let
+      inherit (go) GOARCH GOOS;
+      provider-source-address = "${registry}/${owner}/${repo}";
+    in
+    stdenv.mkDerivation {
+      pname = "terraform-provider-${repo}";
+      inherit version src;
+
+      unpackPhase = "unzip -o $src";
+
+      nativeBuildInputs = [ unzip ];
+
+      buildPhase = ":";
+
+      # The upstream terraform wrapper assumes the provider filename here.
+      installPhase = ''
+        dir=$out/libexec/terraform-providers/${provider-source-address}/${version}/${GOOS}_${GOARCH}
+        mkdir -p "$dir"
+        mv terraform-* "$dir/"
+      '';
+
+      passthru = {
+        inherit provider-source-address;
+      };
+    };
+
+  readJSON = f: builtins.fromJSON (lib.readFile f);
+
+  # fetch the latest version
+  providerFor =
+    owner: repo:
+    let
+      json = readJSON (opentofu-registry + "/providers/${lib.substring 0 1 owner}/${owner}/${repo}.json");
+      latest = lib.head json.versions;
+      matching = lib.filter (e: e.os == "linux" && e.arch == "amd64") latest.targets;
+      target = lib.head matching;
+    in
+    mkTerraformProvider {
+      inherit (latest) version;
+      inherit owner repo;
+      src = fetchurl {
+        url = target.download_url;
+        sha256 = target.shasum;
+      };
+    };
+in
+opentofu.withPlugins (_: [ (providerFor "integrations" "github") ])

tofu/default.nix

@@ -0,0 +1,73 @@
+#!/usr/bin/env ruby
+# 
+
+require "json"
+require "pp"
+
+TF = "tofu"
+ORG = "NixOS"
+
+# Just wrap `gh`, it's easier than to depend on Octokit
+def gh(*command)
+  # HACK: assume there are less than 500 items
+  # HACK: assume that the command doesn't require shell escaping
+  IO.popen("gh --limit=500 #{command.map(&:to_s).join(" ")}") do |io|
+    JSON.load(io)
+  end
+end
+
+
+def tf(*command)
+  system(TF, *command.map(&:to_s))
+end
+
+def tf!(*command)
+  if !tf(*command)
+    throw "terraform command #{command.join(" ")} failed"
+  end
+end
+
+### Import Organization settings
+
+org_id = gh(:api, "/orgs/#{ORG}", "--jq", ".id").strip
+
+File.open("import_org.tf", "w") do |f|
+  f.puts(<<~EOM)
+    import {
+      id = "#{org_id}"
+      to = github_organization_settings.#{ORG}
+    }
+  EOM
+end
+
+### Import REPOS ###
+
+repos = gh(:repo, :list, ORG, "--json=name")
+
+File.open("import_repos.tf", "w") do |f|
+  repos.each do |repo|
+    name = repo["name"]
+
+    id_name = name.gsub(".", "_dot_").gsub(/\d/, "_")
+
+    f.puts(<<~EOM)
+      import {
+        id = "#{name}"
+        to = github_repository.#{id_name}
+      }
+
+      import {
+        id = "#{name}"
+        to = github_repository_collaborators.#{id_name}
+      }
+
+    EOM
+  end
+end
+
+### TODO: import teams
+
+
+### Import the resources in the terraform state and generate the terraform resources
+
+tf!(:plan, "-generate-config-out=repos.tf")