flake: init configuration

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1612433293,
+        "narHash": "sha256-p9vbZBJE8BqLr4uOC+RP12Kg6v6u/gpi8jJ2v1iBAk4=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "2b9daa020d40aac9d6ff3d1941d22acf4a3e9229",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-20.09",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,24 @@
+{
+  description = "Nixos configuration with flakes";
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-20.09";
+  };
+
+  outputs = { self, nixpkgs }: {
+    nixosConfigurations.porthos = nixpkgs.lib.nixosSystem {
+      system = "x86_64-linux";
+      modules =
+        [
+          ({ pkgs, ... }: {
+            # Let 'nixos-version --json' know about the Git revision
+            # of this flake.
+            system.configurationRevision =
+              if self ? rev
+              then self.rev
+              else throw "Refusing to build from a dirty Git tree!";
+          })
+          ./configuration.nix
+        ];
+    };
+  };
+}