python3Packages.pip: allow setting reproducible temporary directory via NIX_PIP_INSTALL_TMPDIR

pkgs/development/interpreters/python/hooks/pip-install-hook.sh

@@ -11,7 +11,9 @@ pipInstallPhase() {
     export PYTHONPATH="$out/@pythonSitePackages@:$PYTHONPATH"
 
     pushd dist || return 1
-    @pythonInterpreter@ -m pip install ./*.whl --no-index --prefix="$out" --no-cache $pipInstallFlags --build tmpbuild
+    mkdir tmpbuild
+    NIX_PIP_INSTALL_TMPDIR=tmpbuild @pythonInterpreter@ -m pip install ./*.whl --no-index --prefix="$out" --no-cache $pipInstallFlags
+    rm -rf tmpbuild
     popd || return 1
 
     runHook postInstall

pkgs/development/python-modules/pip/default.nix

@@ -25,6 +25,10 @@ buildPythonPackage rec {
     name = "${pname}-${version}-source";
   };
 
+  # Remove when solved https://github.com/NixOS/nixpkgs/issues/81441
+  # Also update pkgs/development/interpreters/python/hooks/pip-install-hook.sh accordingly
+  patches = [ ./reproducible.patch ];
+
   nativeBuildInputs = [ bootstrapped-pip ];
 
   # pip detects that we already have bootstrapped_pip "installed", so we need

pkgs/development/python-modules/pip/reproducible.patch

@@ -0,0 +1,13 @@
+diff --git a/src/pip/_internal/operations/install/wheel.py b/src/pip/_internal/operations/install/wheel.py
+index e7315ee4..4e36b03d 100644
+--- a/src/pip/_internal/operations/install/wheel.py
++++ b/src/pip/_internal/operations/install/wheel.py
+@@ -615,6 +615,8 @@ def install_wheel(
+     direct_url=None,  # type: Optional[DirectUrl]
+ ):
+     # type: (...) -> None
++    _temp_dir_for_testing = (
++        _temp_dir_for_testing or os.environ.get("NIX_PIP_INSTALL_TMPDIR"))
+     with TempDirectory(
+         path=_temp_dir_for_testing, kind="unpacked-wheel"
+     ) as unpacked_dir, ZipFile(wheel_path, allowZip64=True) as z: