From 5c06704d4584cbd17d66c214447d313a896811a2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?L=C3=A1szl=C3=B3=20Vask=C3=B3?= <laszlo@iot-inspector.com>
Date: Wed, 20 Oct 2021 18:33:06 +0200
Subject: [PATCH] fetchGit: work-around bug in Nix 2.4

Another approach to make `poetry2nix` work with dependencies specified
by arbitrary `rev=<hash>` values on newer Nix revisions.

Relates-to: https://github.com/nix-community/poetry2nix/pull/358
Relates-to: https://github.com/NixOS/nix/issues/5128
---
 mk-poetry-dep.nix | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/mk-poetry-dep.nix b/mk-poetry-dep.nix
index 5735e320c..fb0ac3cac 100644
--- a/mk-poetry-dep.nix
+++ b/mk-poetry-dep.nix
@@ -169,11 +169,18 @@ pythonPackages.callPackage
       src =
         if isGit then
           (
-            builtins.fetchGit {
+            builtins.fetchGit ({
               inherit (source) url;
               rev = source.resolved_reference or source.reference;
               ref = sourceSpec.branch or sourceSpec.rev or (if sourceSpec?tag then "refs/tags/${sourceSpec.tag}" else "HEAD");
-            }
+            } // (
+              let
+                nixVersion = builtins.substring 0 3 builtins.nixVersion;
+              in
+              lib.optionalAttrs (lib.versionAtLeast nixVersion "2.4") {
+                allRefs = true;
+              }
+            ))
           )
         else if isUrl then
           builtins.fetchTarball