flake: rename flake inputs and add overrides

Now you can add packages to the list in pkgs/override.nix and they will
be pulled in from nixpkgs master instead of the default NixOS flake
when installed.

flake.lock

@@ -19,6 +19,36 @@
         "type": "github"
       }
     },
+    "master": {
+      "locked": {
+        "lastModified": 1596337980,
+        "narHash": "sha256-LyE4haB7x2SBb1AyFJwqtGQitdaBFyK2ov4eH9Agono=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "111221b93ad46bb7119686f0a89a7bf1d3ad5bd7",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "master",
+        "type": "indirect"
+      }
+    },
+    "nixos": {
+      "locked": {
+        "lastModified": 1596329181,
+        "narHash": "sha256-q6NSFQnFbpey/RP2LFfYW9Vcpt6CYKO8Q//6TuNBuYM=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "7dc4385dc7b5b2c0dbfecd774cebbc87ac05c061",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "release-20.03",
+        "type": "indirect"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1591748508,
@@ -33,41 +63,11 @@
         "type": "indirect"
       }
     },
-    "nixpkgs_2": {
-      "locked": {
-        "lastModified": 1596030432,
-        "narHash": "sha256-Q5LNY71SXjEjhyzZ+cInbGu0reezV4LlXbRPe3jk7gk=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "326767fd7309831974e6d7533593725897010c49",
-        "type": "github"
-      },
-      "original": {
-        "id": "nixpkgs",
-        "ref": "release-20.03",
-        "type": "indirect"
-      }
-    },
     "root": {
       "inputs": {
         "home": "home",
-        "nixpkgs": "nixpkgs_2",
+        "master": "master",
-        "unstable": "unstable"
+        "nixos": "nixos"
-      }
-    },
-    "unstable": {
-      "locked": {
-        "lastModified": 1596085265,
-        "narHash": "sha256-GvvEdlmQHmt9S/yrInyJ/unOSlcTHjHoOC4LcOvzATM=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "4701e11216560f85e7b2ecf215e592ff9a46c41b",
-        "type": "github"
-      },
-      "original": {
-        "id": "nixpkgs",
-        "ref": "master",
-        "type": "indirect"
       }
     }
   },

flake.nix

@@ -1,14 +1,17 @@
 {
   description = "A highly structured configuration database.";
 
-  inputs.nixpkgs.url = "nixpkgs/release-20.03";
+  inputs =
-  inputs.unstable.url = "nixpkgs/master";
+    {
-  inputs.home.url = "github:rycee/home-manager/bqv-flakes";
+      master.url = "nixpkgs/master";
+      nixos.url = "nixpkgs/release-20.03";
+      home.url = "github:rycee/home-manager/bqv-flakes";
+    };
 
-  outputs = inputs@{ self, home, nixpkgs, unstable }:
+  outputs = inputs@{ self, home, nixos, master }:
     let
       inherit (builtins) attrNames attrValues readDir;
-      inherit (nixpkgs) lib;
+      inherit (nixos) lib;
       inherit (lib) removeSuffix recursiveUpdate;
       inherit (utils) pathsToImportedAttrs;
 
@@ -23,19 +26,23 @@
           config = { allowUnfree = true; };
         };
 
-      pkgs = pkgImport nixpkgs;
+      pkgset = {
-      unstablePkgs = pkgImport unstable;
+        osPkgs = pkgImport nixos;
+        pkgs = pkgImport master;
+      };
 
     in
+    with pkgset;
     {
       nixosConfigurations =
         import ./hosts (recursiveUpdate inputs {
-          inherit system pkgs
+          inherit lib pkgset system utils;
-            unstablePkgs utils;
         }
         );
 
-      devShell."${system}" = import ./shell.nix { inherit pkgs; };
+      devShell."${system}" = import ./shell.nix {
+        inherit pkgs;
+      };
 
       overlay = import ./pkgs;
 
@@ -47,7 +54,7 @@
         in
         pathsToImportedAttrs overlayPaths;
 
-      packages."${system}" = self.overlay pkgs pkgs;
+      packages."${system}" = (self.overlay osPkgs osPkgs);
 
       nixosModules =
         let

hosts/default.nix

@@ -1,8 +1,17 @@
-{ home, nixpkgs, unstable, unstablePkgs, self, pkgs, system, utils, ... }:
+{ home
+, lib
+, nixos
+, master
+, pkgset
+, self
+, system
+, utils
+, ...
+}:
 let
-  inherit (nixpkgs) lib;
   inherit (utils) recImport;
   inherit (builtins) attrValues removeAttrs;
+  inherit (pkgset) osPkgs pkgs;
 
   config = hostName:
     lib.nixosSystem {
@@ -16,31 +25,36 @@ let
 
           global = {
             networking.hostName = hostName;
-            nix.nixPath = [
+            nix.nixPath = let path = toString ../.; in
-              "nixpkgs=${nixpkgs}"
+              [
-              "nixos-config=/etc/nixos/configuration.nix"
+                "nixpkgs=${master}"
-              "nixpkgs-overlays=/etc/nixos/overlays"
+                "nixos=${nixos}"
-            ];
+                "nixos-config=${path}/configuration.nix"
+                "nixpkgs-overlays=${path}/overlays"
+              ];
 
-            nixpkgs = { inherit pkgs; };
+            nixpkgs = { pkgs = osPkgs; };
 
             nix.registry = {
-              nixpkgs.flake = nixpkgs;
+              nixos.flake = nixos;
               nixflk.flake = self;
-              master.flake = unstable;
+              nixpkgs.flake = master;
             };
           };
 
-          unstables = {
+          overrides = {
-            systemd.package = unstablePkgs.systemd;
+            # use latest systemd
-            nixpkgs.overlays = [
+            systemd.package = pkgs.systemd;
-              (final: prev:
+
-                with unstablePkgs; {
+            nixpkgs.overlays =
-                  inherit starship element-desktop discord signal-desktop mpv
+              let
-                    protonvpn-cli-ng dhall nixpkgs-fmt;
+                override = import ../pkgs/override.nix pkgs;
-                }
+
-              )
+                overlay = pkg: final: prev: {
-            ];
+                  inherit pkg;
+                };
+              in
+              map overlay override;
           };
 
           local = import "${toString ./.}/${hostName}.nix";
@@ -50,7 +64,7 @@ let
             attrValues (removeAttrs self.nixosModules [ "profiles" ]);
 
         in
-        flakeModules ++ [ core global local home-manager unstables ];
+        flakeModules ++ [ core global local home-manager overrides ];
 
     };
 

pkgs/override.nix

@@ -0,0 +1,15 @@
+# Packages in this list are imported by hosts/default.nix, and are pulled from
+# nixpkgs master instead of the default nixos release. This doesn't actually
+# install them, just creates an overlay to pull them from master if they are
+# installed by the user elsewhere in the configuration.
+pkgs:
+with pkgs;
+[
+  starship
+  element-desktop
+  discord
+  signal-desktop
+  mpv
+  dhall
+  nixpkgs-fmt
+]