From 8f5b5baed7eb09aa84e09bffb33a437e90186ba7 Mon Sep 17 00:00:00 2001
From: Silvan Mosberger <contact@infinisil.com>
Date: Sun, 23 Feb 2020 10:09:24 +0100
Subject: [PATCH] poetry: Fix build with Python 3.8

---
 pkgs/development/tools/poetry/default.nix | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/pkgs/development/tools/poetry/default.nix b/pkgs/development/tools/poetry/default.nix
index 1517e53f219c..5035677beb00 100644
--- a/pkgs/development/tools/poetry/default.nix
+++ b/pkgs/development/tools/poetry/default.nix
@@ -8,6 +8,12 @@ poetry2nix.mkPoetryApplication {
   pyproject = ./pyproject.toml;
   poetrylock = ./poetry.lock;
 
+  overrides = [ (poetry2nix.defaultPoetryOverrides.overrideOverlay (self: super: {
+    # Needed because poetry2nix currently doesn't handle pyproject.toml python bounds
+    # See https://github.com/nix-community/poetry2nix/issues/50
+    importlib-metadata = if python.pythonOlder "3.8" then super.importlib-metadata else null;
+  }))];
+
   src = fetchFromGitHub (lib.importJSON ./src.json);
 
   # "Vendor" dependencies (for build-system support)