added: offer pinned overlay

flake.lock

@@ -2,11 +2,11 @@
   "nodes": {
     "flake-utils": {
       "locked": {
-        "lastModified": 1609246779,
-        "narHash": "sha256-eq6ZXE/VWo3EMC65jmIT6H/rrUc9UWOWVujkzav025k=",
+        "lastModified": 1614513358,
+        "narHash": "sha256-LakhOx3S1dRjnh0b5Dg3mbZyH0ToC9I8Y2wKSkBaTzU=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "08c7ad4a0844adc4a7f9f5bb3beae482e789afa4",
+        "rev": "5466c5bbece17adaab2d82fae80b46e807611bf3",
         "type": "github"
       },
       "original": {
@@ -17,11 +17,12 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1609187327,
-        "narHash": "sha256-6lCwWpGpZxbSYclryv4ixsxxbISe7HuLyyQnGWCC8ZQ=",
-        "path": "/nix/store/dcmj4p477fgzxz33rxss9wnmslnsahgx-source",
-        "rev": "e065200fc90175a8f6e50e76ef10a48786126e1c",
-        "type": "path"
+        "lastModified": 1617130537,
+        "narHash": "sha256-AHzQ2fQUs5pDPy/jJsJjzl8S0ftRjKVjIzBnHFxxacg=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "446a2ffb5b9caa4d57cefda05961c1f2bbbfe0aa",
+        "type": "github"
       },
       "original": {
         "id": "nixpkgs",

flake.nix

@@ -25,5 +25,17 @@
       ) // rec {
       nixosModules.brownpaper = import ./mod.nix;
       nixosModule = nixosModules.brownpaper;
-    });
+    }) // rec {
+      overlay = final: prev:
+        let
+          bp = final.callPackage ./default.nix { pkgs = final; src = self; };
+        in
+        {
+          brownpaper = bp.client;
+          brownpaper-server = bp.server;
+        };
+      overlays = {
+        pinned = final: prev: (overlay (import nixpkgs { inherit (final) system; }) { });
+      };
+    };
 }

mod.nix

@@ -3,7 +3,7 @@ with lib;
 let
   cfg = config.services.brownpaper;
   cfgc = config.programs.brownpaper;
-  package = pkgs.callPackage ./. { inherit pkgs; src = ./.; };
+  package = if pkgs ? brownpaper-server && pkgs ? brownpaper then { server = pkgs.brownpaper-server; client = pkgs.brownpaper; } else (pkgs.callPackage ./. { inherit pkgs; src = ./.; });
   keyDir = pkgs.runCommand "brownpaper-keys" { } ''
     mkdir -p $out
     ${concatStringsSep " && " (builtins.map (key: "cp ${key} $out/") cfg.pgpKeys)}