From 855fcc324a5e83d3abced135d4b6ecad02cc022a Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Fri, 13 Sep 2019 18:58:40 +0200
Subject: Add option system.configurationRevision to record revision of
 top-level flake

---
 nixos/modules/misc/version.nix | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/nixos/modules/misc/version.nix b/nixos/modules/misc/version.nix
index 8a85035ceb7..8dbbbe6761c 100644
--- a/nixos/modules/misc/version.nix
+++ b/nixos/modules/misc/version.nix
@@ -84,6 +84,12 @@ in
       description = "Default NixOS channel to which the root user is subscribed.";
     };
 
+    configurationRevision = mkOption {
+      type = types.nullOr types.str;
+      default = null;
+      description = "The Git revision of the top-level flake from which this configuration was built.";
+    };
+
   };
 
   config = {
-- 
cgit 1.4.1