feat(nix): support non-Flakes users

Not all Nix users can make use of Flakes.

This adds the compatibility for non-Flakes users.

Signed-off-by: Ryan Lahfa <ryan.lahfa@inria.fr>

1 files changed, 16 insertions, 0 deletions

diff --git a/default.nix b/default.nix
new file mode 100644
index 00000000..d7da8cd1
--- /dev/null
+++ b/default.nix
@@ -0,0 +1,16 @@
+# This file provides backward compatibility to nix < 2.4 clients
+{ system ? builtins.currentSystem }:
+let
+  lock = builtins.fromJSON (builtins.readFile ./flake.lock);
+
+  inherit (lock.nodes.flake-compat.locked) owner repo rev narHash;
+
+  flake-compat = fetchTarball {
+    url = "https://github.com/${owner}/${repo}/archive/${rev}.tar.gz";
+    sha256 = narHash;
+  };
+
+  flake = import flake-compat { inherit system; src = ./.; };
+in
+flake.defaultNix
+