From e474f71da420e1357bdd808c5d7e8470919c0ba3 Mon Sep 17 00:00:00 2001
From: Victor Engmark <vengmark@linz.govt.nz>
Date: Fri, 22 Oct 2021 12:19:10 +1300
Subject: [PATCH] feat: Fix Python package install issue

Works around <https://github.com/nix-community/poetry2nix/issues/244>.
---
 shell.nix | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/shell.nix b/shell.nix
index ace88de8d2..6b6dc4f6d0 100644
--- a/shell.nix
+++ b/shell.nix
@@ -8,9 +8,32 @@ let
         sha256 = "03yharwv0lal286d3zy6b7kj4px111s5h3a8nar8banpnqgml7v5";
       })
     { };
+in
+let
   poetryEnv = pkgs.poetry2nix.mkPoetryEnv {
     python = pkgs.python38;
     projectDir = builtins.path { path = ./.; name = "geostore"; };
+    overrides = pkgs.poetry2nix.overrides.withDefaults (self: super: {
+      pip =
+        if pkgs.lib.versionAtLeast super.pip.version "20.3" then
+          super.pip.overridePythonAttrs
+            (old:
+              let
+                pname = "pip";
+                version = "20.2.4";
+              in
+              {
+                name = pname + "-" + version;
+                inherit version;
+                src = pkgs.fetchFromGitHub {
+                  owner = "pypa";
+                  repo = pname;
+                  rev = version;
+                  sha256 = "eMVV4ftgV71HLQsSeaOchYlfaJVgzNrwUynn3SA1/Do=";
+                  name = "${pname}-${version}-source";
+                };
+              }) else super.pip;
+    });
   };
 in
 pkgs.mkShell {