Lock flake-compat in the flake and have a common entrypoint for it

Author: jaen

flake.lock

@@ -4,10 +4,13 @@
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.11";
     nixpkgs-unstable.url = "github:NixOS/nixpkgs/nixos-unstable";
+
     androidPkgs.url = "github:tadfisher/android-nixpkgs/stable";
+
+    flake-compat.url = "github:nix-community/flake-compat";
   };
 
-  outputs = { self, nixpkgs, nixpkgs-unstable, androidPkgs,  ... }@inputs: let
+  outputs = { self, nixpkgs, nixpkgs-unstable, androidPkgs, flake-compat,  ... }@inputs: let
     pkgs = import ./pkgs/default.nix { inherit inputs; };
   in {
     # robotnixSystem evaluates a robotnix configuration

flake.nix

@@ -0,0 +1,17 @@
+{ system ? builtins.currentSystem }:
+  let
+    lock               = builtins.fromJSON (builtins.readFile ./../flake.lock);
+    flake-compat-entry = lock.nodes.root.inputs.flake-compat;
+
+    inherit (lock.nodes."${ flake-compat-entry }".locked) owner repo narHash;
+
+    flake-compat = builtins.fetchTarball {
+                     url = "https://github.com/${ owner }/${ repo }/archive/${ lock.nodes.flake-compat.locked.rev }.tar.gz";
+                     sha256 = narHash;
+                   };
+  in
+    import flake-compat {
+      inherit system;
+
+       src =  ./..;
+    }

flake/compat.nix

@@ -1,13 +1,7 @@
 # SPDX-FileCopyrightText: 2020 Daniel Fullmer and robotnix contributors
 # SPDX-License-Identifier: MIT
 
-{ inputs ? (import (
-    fetchTarball {
-      url = "https://github.com/nix-community/flake-compat/archive/8bf105319d44f6b9f0d764efa4fdef9f1cc9ba1c.tar.gz";
-      sha256 = "sha256:0b1vcbficjcrdyqzn4pbb63xwjch1056nmjyyhk4p7kdskhl3nlj"; }
-  ) {
-    src =  ../.;
-  }).defaultNix.inputs,
+{ inputs ? (import ../flake/compat.nix).defaultNix.inputs,
   ... }@args:
 
 let

pkgs/default.nix

@@ -1,7 +1,2 @@
-(import (
-  fetchTarball {
-    url = "https://github.com/edolstra/flake-compat/archive/12c64ca55c1014cdc1b16ed5a804aa8576601ff2.tar.gz";
-    sha256 = "0jm6nzb83wa6ai17ly9fzpqc40wg1viib8klq8lby54agpl213w5"; }
-) {
-  src =  ./.;
-}).shellNix.default
+{ system ? builtins.currentSystem }:
+  (import ./flake/compat.nix { inherit system; }).shellNix