From 60330b60655b3fa3a18624bdd7069855bb37af99 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Wed, 5 Feb 2020 16:00:27 +0100
Subject: [PATCH] flake.nix: Handle missing rev attribute

Dirty trees no longer set 'rev', so we need to handle this.
---
 flake.nix | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/flake.nix b/flake.nix
index 3f9e22bdae0f..e2346f99c7aa 100644
--- a/flake.nix
+++ b/flake.nix
@@ -23,8 +23,8 @@
           import ./nixos/lib/eval-config.nix (args // {
             modules = modules ++
               [ { system.nixos.versionSuffix =
-                    ".${lib.substring 0 8 self.lastModified}.${self.shortRev}";
-                  system.nixos.revision = self.rev;
+                    ".${lib.substring 0 8 self.lastModified}.${self.shortRev or "dirty"}";
+                  system.nixos.revision = lib.mkIf (self ? rev) self.rev;
                 }
               ];
           });