From: Colin Watson <cjwatson@debian.org>
Date: Sun, 4 Jan 2026 18:01:44 +0000
Subject: Stop using pkg_resources

The upstream project has been archived, so there's nowhere to forward
this to.

Bug-Debian: https://bugs.debian.org/1083591
Last-Update: 2026-01-04
---
 ptr/__init__.py | 31 ++++++++++++++-----------------
 1 file changed, 14 insertions(+), 17 deletions(-)

diff --git a/ptr/__init__.py b/ptr/__init__.py
index 41192fa..cb099f4 100644
--- a/ptr/__init__.py
+++ b/ptr/__init__.py
@@ -8,9 +8,8 @@ import contextlib as _contextlib
 import sys as _sys
 import operator as _operator
 import itertools as _itertools
-import warnings as _warnings
 
-import pkg_resources
+from packaging.markers import InvalidMarker, Marker
 import setuptools.command.test as orig
 from setuptools import Distribution
 
@@ -121,7 +120,10 @@ class PyTest(orig.test):
         instead of declaring the dependency in the package
         metadata, assert the requirement at run time.
         """
-        pkg_resources.require('setuptools>=27.3')
+        # For Debian, do nothing.  pkg_resources is deprecated with no
+        # natural replacement for pkg_resources.require (see e.g.
+        # https://github.com/pypa/packaging-problems/issues/664), and the
+        # last several stable Debian releases have shipped setuptools>=27.3.
 
     def finalize_options(self):
         if self.addopts:
@@ -133,11 +135,12 @@ class PyTest(orig.test):
         Given an environment marker, return True if the marker is valid
         and matches this environment.
         """
-        return (
-            not marker
-            or not pkg_resources.invalid_marker(marker)
-            and pkg_resources.evaluate_marker(marker)
-        )
+        if not marker:
+            return True
+        try:
+            return Marker(marker).evaluate()
+        except InvalidMarker:
+            return False
 
     def install_dists(self, dist):
         """
@@ -170,15 +173,9 @@ class PyTest(orig.test):
 
     @staticmethod
     def _warn_old_setuptools():
-        msg = (
-            "pytest-runner will stop working on this version of setuptools; "
-            "please upgrade to setuptools 30.4 or later or pin to "
-            "pytest-runner < 5."
-        )
-        ver_str = pkg_resources.get_distribution('setuptools').version
-        ver = pkg_resources.parse_version(ver_str)
-        if ver < pkg_resources.parse_version('30.4'):
-            _warnings.warn(msg)
+        # For Debian, do nothing.  The last several stable Debian releases
+        # have shipped setuptools>=30.4.
+        return
 
     def run(self):
         """