From a6c5a14ae7b04d0c54ea1b5cc5b007e90ca66e98 Mon Sep 17 00:00:00 2001
From: Grimmauld <Grimmauld@grimmauld.de>
Date: Sun, 27 Sep 2026 22:32:49 +0200
Subject: [PATCH] python3Packages.pip: fix shell completions on cross

---
 .../python-modules/pip/default.nix            | 25 ++++++++++++-------
 1 file changed, 16 insertions(+), 9 deletions(-)

diff --git a/pkgs/development/python-modules/pip/default.nix b/pkgs/development/python-modules/pip/default.nix
index b12013744b3d..e687a583c162 100644
--- a/pkgs/development/python-modules/pip/default.nix
+++ b/pkgs/development/python-modules/pip/default.nix
@@ -2,11 +2,13 @@
   lib,
   buildPythonPackage,
   fetchFromGitHub,
-  pythonAtLeast,
 
   # build-system
   flit-core,
   installShellFiles,
+  stdenv,
+  buildPackages,
+  python,
 
   # docs
   sphinx,
@@ -104,14 +106,19 @@ let
       werkzeug
     ];
 
-    postInstall = ''
-      installManPage docs/build/man/*
-
-      installShellCompletion --cmd pip \
-        --bash <($out/bin/pip completion --bash --no-cache-dir) \
-        --fish <($out/bin/pip completion --fish --no-cache-dir) \
-        --zsh <($out/bin/pip completion --zsh --no-cache-dir)
-    '';
+    postInstall =
+      let
+        emulator = stdenv.hostPlatform.emulator buildPackages;
+      in
+      ''
+        installManPage docs/build/man/*
+      ''
+      + lib.optionalString (stdenv.hostPlatform.emulatorAvailable buildPackages) ''
+        installShellCompletion --cmd pip \
+          --bash <(${emulator} ${python.interpreter} $out/bin/pip completion --bash --no-cache-dir) \
+          --fish <(${emulator} ${python.interpreter} $out/bin/pip completion --fish --no-cache-dir) \
+          --zsh <(${emulator} ${python.interpreter} $out/bin/pip completion --zsh --no-cache-dir)
+      '';
 
     passthru.tests = {
       inherit pip-tools;