From 140598a28b4a34c973aab643c12c50bda7493e61 Mon Sep 17 00:00:00 2001
From: Rodrigo Arias Mallo <rodrigo.arias@bsc.es>
Date: Mon, 11 Jan 2021 16:41:56 +0100
Subject: [PATCH] Pin nixpkgs

---
 default.nix | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/default.nix b/default.nix
index 0077d5f..4c0c191 100644
--- a/default.nix
+++ b/default.nix
@@ -1,6 +1,17 @@
 let
   bscOverlay = import ./overlay.nix;
-  pkgs = import <nixpkgs> {
+
+  # Pin the nixpkgs
+  nixpkgsPath = builtins.fetchTarball {
+    # Descriptive name to make the store path easier to identify
+    name = "nixos-20.09";
+    # Commit hash for nixos-20.09 as of 2021-01-11
+    url = "https://github.com/nixos/nixpkgs/archive/41dddb1283733c4993cb6be9573d5cef937c1375.tar.gz";
+    # Hash obtained using `nix-prefetch-url --unpack <url>`
+    sha256 = "1blbidbmxhaxar2x76nz72bazykc5yxi0algsbrhxgrsvijs4aiw";
+  };
+
+  pkgs = import nixpkgsPath {
     overlays = [ bscOverlay ];
   };