[3.10] gh-149776: Skip UDP Lite tests if it's not supported (#149777)

Doc/using/windows.rst

@@ -397,7 +397,8 @@ on using nuget. What follows is a summary that is sufficient for Python
 developers.
 
 The ``nuget.exe`` command line tool may be downloaded directly from
-``https://aka.ms/nugetclidl``, for example, using curl or PowerShell. With the
+``https://dist.nuget.org/win-x86-commandline/latest/nuget.exe``, for example,
+using curl or PowerShell. With the
 tool, the latest version of Python for 64-bit or 32-bit machines is installed
 using::
 

Lib/test/test_socket.py

@@ -142,6 +142,25 @@ def _have_socket_bluetooth():
     return True
 
 
+def _have_udp_lite():
+    if not hasattr(socket, "IPPROTO_UDPLITE"):
+        return False
+    # Older Android versions block UDPLITE with SELinux.
+    if support.is_android and platform.android_ver().api_level < 29:
+        return False
+
+    try:
+        sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDPLITE)
+    except OSError as exc:
+        # Linux 7.1 removed UDP Lite support
+        if exc.errno == errno.EPROTONOSUPPORT:
+            return False
+        raise
+    sock.close()
+
+    return True
+
+
 @contextlib.contextmanager
 def socket_setdefaulttimeout(timeout):
     old_timeout = socket.getdefaulttimeout()
@@ -166,7 +185,7 @@ def socket_setdefaulttimeout(timeout):
 
 HAVE_SOCKET_VSOCK = _have_socket_vsock()
 
-HAVE_SOCKET_UDPLITE = hasattr(socket, "IPPROTO_UDPLITE")
+HAVE_SOCKET_UDPLITE = _have_udp_lite()
 
 HAVE_SOCKET_BLUETOOTH = _have_socket_bluetooth()
 

Misc/NEWS.d/next/Build/2026-07-09-22-45-00.gh-issue-153438.Qr7N2p.rst

@@ -0,0 +1,2 @@
+Update Windows build and installer tooling and documentation to use the
+current download URL for ``nuget.exe``.

Misc/NEWS.d/next/Tests/2026-05-13-14-53-23.gh-issue-149776.orqgsn.rst

@@ -0,0 +1,2 @@
+Fix test_socket on Linux kernel 7.1 and newer: skip UDP Lite tests if it's
+not supported. Patch by Victor Stinner.

PCbuild/find_python.bat

@@ -45,7 +45,7 @@
 @set _Py_HOST_PYTHON=%HOST_PYTHON%
 @if "%_Py_HOST_PYTHON%"=="" set _Py_HOST_PYTHON=py
 @if "%_Py_NUGET%"=="" (set _Py_NUGET=%_Py_EXTERNALS_DIR%\nuget.exe)
-@if "%_Py_NUGET_URL%"=="" (set _Py_NUGET_URL=https://aka.ms/nugetclidl)
+@if "%_Py_NUGET_URL%"=="" (set _Py_NUGET_URL=https://dist.nuget.org/win-x86-commandline/latest/nuget.exe)
 @if NOT exist "%_Py_NUGET%" (
     @echo Downloading nuget...
     @rem NB: Must use single quotes around NUGET here, NOT double!

Tools/msi/get_externals.bat

@@ -6,7 +6,7 @@ set HERE=%~dp0
 if "%PCBUILD%"=="" (set PCBUILD=%HERE%..\..\PCbuild\)
 if "%EXTERNALS_DIR%"=="" (set EXTERNALS_DIR=%HERE%..\..\externals\windows-installer)
 if "%NUGET%"=="" (set NUGET=%EXTERNALS_DIR%\..\nuget.exe)
-if "%NUGET_URL%"=="" (set NUGET_URL=https://aka.ms/nugetclidl)
+if "%NUGET_URL%"=="" (set NUGET_URL=https://dist.nuget.org/win-x86-commandline/latest/nuget.exe)
 
 set DO_FETCH=true
 set DO_CLEAN=false