zoneinfo.patch

--- pytz-2026.1.post1/pytz/__init__.py.orig	2026-03-03 08:47:27.000000000 +0100
+++ pytz-2026.1.post1/pytz/__init__.py	2026-04-24 15:50:33.000000000 +0200
@@ -75,12 +75,13 @@
         return s.encode('ASCII')
 
 
+_tzinfo_dir = os.getenv("TZDIR") or "/usr/share/zoneinfo"
+if _tzinfo_dir.endswith(os.sep):
+    _tzinfo_dir = _tzinfo_dir[:-1]
+
 def open_resource(name):
     """Open a resource from the zoneinfo subdir for reading.
 
-    Uses the pkg_resources module if available and no standard file
-    found at the calculated location.
-
     It is possible to specify different location for zoneinfo
     subdir by using the PYTZ_TZDATADIR environment variable.
     """
@@ -92,29 +93,7 @@
     if zoneinfo_dir is not None:
         filename = os.path.join(zoneinfo_dir, *name_parts)
     else:
-        filename = os.path.join(os.path.dirname(__file__),
-                                'zoneinfo', *name_parts)
-        if not os.path.exists(filename):
-            # pkg_resources is deprecated, try with importlib first
-            try:
-                from importlib.resources import files
-            except ImportError:
-                files = None
-
-            if files is not None:
-                # retrieve the zoneinfo file Path object and return its file handle
-                return files(__name__).joinpath('zoneinfo', *name_parts).open('rb')
-
-            # http://bugs.launchpad.net/bugs/383171 - we avoid using this
-            # unless absolutely necessary to help when a broken version of
-            # pkg_resources is installed.
-            try:
-                from pkg_resources import resource_stream
-            except ImportError:
-                resource_stream = None
-
-            if resource_stream is not None:
-                return resource_stream(__name__, 'zoneinfo/' + name)
+        filename = os.path.join(_tzinfo_dir, *name_parts)
     return open(filename, 'rb')
 
 
@@ -212,7 +191,7 @@
     """case-insensitively matching timezone, else return zone unchanged"""
     global _all_timezones_lower_to_standard
     if _all_timezones_lower_to_standard is None:
-        _all_timezones_lower_to_standard = dict((tz.lower(), tz) for tz in _all_timezones_unchecked)  # noqa
+        _all_timezones_lower_to_standard = dict((tz.lower(), tz) for tz in all_timezones)  # noqa
     return _all_timezones_lower_to_standard.get(zone.lower()) or zone  # noqa
 
 
@@ -524,11 +503,37 @@
 
 if __name__ == '__main__':
     _test()
-all_timezones = LazyList(
-        tz for tz in _all_timezones_unchecked if resource_exists(tz))
-        
+all_timezones = []
+for root, dirs, files in os.walk(_tzinfo_dir):
+    for exclude in "posix", "right":
+        if exclude in dirs:
+            del dirs[dirs.index(exclude)]
+
+    all_timezones.extend(
+        os.path.join(root, file)[len(_tzinfo_dir)+1:]
+        for file in files
+        if file != "README" and file != "Theory" and "." not in file
+    )
+all_timezones.sort()
+
 all_timezones_set = LazySet(all_timezones)
-common_timezones = LazyList(
-            tz for tz in common_timezones if tz in all_timezones)
-        
+
+with open(os.path.join(_tzinfo_dir, "zone.tab")) as ztf:
+    common_timezones = [
+        l.split()[2]
+        for l in ztf
+        if l != "" and l[0] != "#"
+    ] + [
+        "GMT",
+        "US/Alaska",
+        "US/Arizona",
+        "US/Central",
+        "US/Eastern",
+        "US/Hawaii",
+        "US/Mountain",
+        "US/Pacific",
+        "UTC",
+    ]
+common_timezones.sort()
+
 common_timezones_set = LazySet(common_timezones)