From f2f22eb254be27577cde2c2ab7e6cda80c1229a5 Mon Sep 17 00:00:00 2001
From: Scott Worley <scottworley@scottworley.com>
Date: Mon, 7 Jun 2021 12:13:43 -0700
Subject: [PATCH 1/1] Use nix from nixpkgs (not from PATH) to avoid nixUnstable

---
 Changelog   | 4 ++++
 default.nix | 8 ++++++--
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/Changelog b/Changelog
index ed58b28..7946d7b 100644
--- a/Changelog
+++ b/Changelog
@@ -1,4 +1,8 @@
 ## [Unreleased]
+### Changed
+- Use nix from nixpkgs rather than from PATH.  This is needed when the nix in
+PATH is nixUnstable-3.0pre20201020_e0ca98c or later because nix commit
+787469c7b66aec12ab6847e7db2cdc8aef5c325e removed <nix/unpack-channel.nix>.
 
 
 ## [3.0.3] - 2021-05-20
diff --git a/default.nix b/default.nix
index 913f546..8c8fbd3 100644
--- a/default.nix
+++ b/default.nix
@@ -34,14 +34,18 @@ let
       checkPhase = "./test.sh";
     };
 
-in pkgs.python3Packages.callPackage
-({ lib, buildPythonPackage, nix, git, autopep8, mypy, pylint, git-cache, }:
+in pkgs.python3Packages.callPackage ({ lib, buildPythonPackage, nix, git
+  , autopep8, makeWrapper, mypy, pylint, git-cache, }:
   buildPythonPackage rec {
     pname = "pinch";
     version = "3.0.4-pre";
     src = lib.cleanSource ./.;
+    buildInputs = [ makeWrapper ];
     propagatedBuildInputs = [ git-cache ];
     checkInputs = [ nix git mypy ] ++ lib.optionals lint [ autopep8 pylint ];
+    postInstall = ''
+      wrapProgram "$out/bin/pinch" --prefix PATH : ${nix}/bin
+    '';
     doCheck = true;
     checkPhase = "./test.sh";
   }) {
-- 
2.44.1