Add a flake.nix

flake.nix

@@ -0,0 +1,18 @@
+{
+  name = "nix";
+
+  description = "The purely functional package manager";
+
+  requires = [ flake:nixpkgs ];
+
+  provides = flakes: rec {
+
+    hydraJobs = import ./release.nix {
+      nix = flakes.nix; # => flakes.self?
+      nixpkgs = flakes.nixpkgs;
+    };
+
+    packages.nix = hydraJobs.build.x86_64-linux;
+
+  };
+}

release.nix

@@ -19,7 +19,7 @@ let
       releaseTools.sourceTarball {
         name = "nix-tarball";
         version = builtins.readFile ./.version;
-        versionSuffix = if officialRelease then "" else "pre${toString nix.revCount}_${nix.shortRev}";
+        versionSuffix = if officialRelease then "" else "pre${toString nix.revCount or 0}_${nix.shortRev or "0000000"}";
         src = nix;
         inherit officialRelease;