Replace requirements.txt with a Nix flake

ansible/README.md

@@ -2,10 +2,11 @@
 
 ## Ansible Control Node Setup
 
-In a Python 3 environment (perhaps a venv), run:
+The root of this repo contains a `flake.nix` that defines a shell with all necessary tools.
+To drop into a shell with `ansible-*` commands, run:
 
 ```
-pip install -r requirements.txt
+nix develop
 ```
 
 ## `misc.yaml`

ansible/requirements.txt

@@ -1,2 +0,0 @@
-ansible==6.4.0
-ansible-lint==6.5.2

flake.lock

@@ -0,0 +1,42 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1659877975,
+        "narHash": "sha256-zllb8aq3YO3h8B/U0/J1WBgAL8EX5yWf5pMj3G0NAmc=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "c0e246b9b83f637f4681389ecabcb2681b4f3af0",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1663707275,
+        "narHash": "sha256-xRIlf8OWJLPxeF5y8iToWx9M1P3pUhPuyXeXUrIjaf8=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "2f8b8bc98da3cbcf287df9cb4fae4857282fe60a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,27 @@
+{
+  description = "infrastructure environment";
+
+  inputs = {
+    # lib
+    nixpkgs.url = github:nixos/nixpkgs;
+    flake-utils.url = github:numtide/flake-utils;
+  };
+
+  outputs = { self, nixpkgs, flake-utils }: flake-utils.lib.eachDefaultSystem (system:
+    let
+      pkgs = nixpkgs.legacyPackages.${system};
+    in
+      {
+        devShells.default = pkgs.mkShell {
+          buildInputs = [
+            pkgs.python3Packages.ansible
+            pkgs.python3Packages.ansible-lint
+          ];
+
+          shellHook = ''
+            PS1="(infra) $PS1"
+          '';
+        };
+      }
+  );
+}