From 9191fbae30f60360b94f0de19b9044fa410abeec Mon Sep 17 00:00:00 2001
From: Michael Lingelbach <m.j.lbach@gmail.com>
Date: Fri, 22 Jan 2021 13:42:49 -0800
Subject: [PATCH] Ensure ref passed to builtins.fetchGit points to
 refs/tags/sourceSpec.tag

---
 mk-poetry-dep.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mk-poetry-dep.nix b/mk-poetry-dep.nix
index b636c91..bb7b4e3 100644
--- a/mk-poetry-dep.nix
+++ b/mk-poetry-dep.nix
@@ -161,7 +161,7 @@ pythonPackages.callPackage
             builtins.fetchGit {
               inherit (source) url;
               rev = source.resolved_reference or source.reference;
-              ref = sourceSpec.branch or sourceSpec.rev or sourceSpec.tag or "HEAD";
+              ref = sourceSpec.branch or sourceSpec.rev or (if sourceSpec?tag then "refs/tags/${sourceSpec.tag}" else "HEAD");
             }
           )
         else if isUrl then