add example flake and support --flake in darwin-rebuild

1 files changed, 27 insertions, 0 deletions

diff --git a/modules/examples/flake.nix b/modules/examples/flake.nix
new file mode 100644
index 0000000..90b0939
--- /dev/null
+++ b/modules/examples/flake.nix
@@ -0,0 +1,27 @@
+{
+  description = "Example darwin system flake";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-20.09-darwin";
+    darwin.url = "github:lnl7/nix-darwin/flakes";
+    darwin.inputs.nixpkgs.follows = "nixpkgs";
+  };
+
+  outputs = { self, darwin, nixpkgs }:
+  let
+    configuration = { pkgs, ... }: {
+      nix.package = pkgs.nixFlakes;
+    };
+  in
+  {
+    # Build darwin flake using:
+    # $ darwin-rebuild build --flake ./modules/examples#darwinConfigurations.simple.system \
+    #       --override-input darwin .
+    darwinConfigurations."simple" = darwin.lib.darwinSystem {
+      modules = [ configuration darwin.darwinModules.simple ];
+    };
+
+    # Expose the package set, including overlays, for convenience.
+    darwinPackages = self.darwinConfigurations."simple".pkgs;
+  };
+}