Reviewed-by: Jared Rossi <jro...@linux.ibm.com>

On 9/12/25 4:52 AM, Thomas Huth wrote:
From: Thomas Huth <th...@redhat.com>

pylint complains about wrong identation in one of the lines and
that the pxelinux_cfg_contents is a constant that should be written
with capital letters. While we're at it, also add the missing doc
strings.

Signed-off-by: Thomas Huth <th...@redhat.com>
---
  tests/functional/s390x/test_pxelinux.py | 25 ++++++++++++++++++-------
  1 file changed, 18 insertions(+), 7 deletions(-)

diff --git a/tests/functional/s390x/test_pxelinux.py 
b/tests/functional/s390x/test_pxelinux.py
index 4fc33b8c46d..c00cce6a5a4 100755
--- a/tests/functional/s390x/test_pxelinux.py
+++ b/tests/functional/s390x/test_pxelinux.py
@@ -1,10 +1,11 @@
  #!/usr/bin/env python3
  #
  # SPDX-License-Identifier: GPL-2.0-or-later
-#
-# Functional test that checks the pxelinux.cfg network booting of a s390x VM
-# (TFTP booting without config file is already tested by the pxe qtest, so
-#  we don't repeat that here).
+'''
+Functional test that checks the pxelinux.cfg network booting of a s390x VM
+(TFTP booting without config file is already tested by the pxe qtest, so
+we don't repeat that here).
+'''
import os
  import shutil
@@ -12,7 +13,7 @@
  from qemu_test import QemuSystemTest, Asset, wait_for_console_pattern
-pxelinux_cfg_contents='''# pxelinux.cfg style config file
+PXELINUX_CFG_CONTENTS='''# pxelinux.cfg style config file
  default Debian
  label Nonexisting
  kernel kernel.notavailable
@@ -26,6 +27,10 @@
  '''
class S390PxeLinux(QemuSystemTest):
+    '''
+    Test various ways of booting via a pxelinux.cfg file, for details see:
+    https://wiki.syslinux.org/wiki/index.php?title=PXELINUX#Configuration
+    '''
ASSET_DEBIAN_KERNEL = Asset(
          ('https://snapshot.debian.org/archive/debian/'
@@ -46,6 +51,7 @@ class S390PxeLinux(QemuSystemTest):
          '480859574f3f44caa6cd35c62d70e1ac0609134e22ce2a954bbed9b110c06e0b')
def pxelinux_launch(self, pl_name='default', extra_opts=None):
+        '''Create a pxelinux.cfg file in the right location and launch QEMU'''
          self.require_netdev('user')
          self.set_machine('s390-ccw-virtio')
@@ -66,11 +72,11 @@ def pxelinux_launch(self, pl_name='default', extra_opts=None): cfg_fname = self.scratch_file('tftp', 'pxelinux.cfg', pl_name)
          with open(cfg_fname, 'w', encoding='utf-8') as f:
-            f.write(pxelinux_cfg_contents)
+            f.write(PXELINUX_CFG_CONTENTS)
virtio_net_dev = 'virtio-net-ccw,netdev=n1,bootindex=1'
          if extra_opts:
-                virtio_net_dev += ',' + extra_opts
+            virtio_net_dev += ',' + extra_opts
self.vm.add_args('-m', '384',
                           '-netdev', f'user,id=n1,tftp={tftpdir}',
@@ -80,6 +86,7 @@ def pxelinux_launch(self, pl_name='default', extra_opts=None):
def test_default(self):
+        '''Check whether the guest uses the "default" file name'''
          self.pxelinux_launch()
          # The kernel prints its arguments to the console, so we can use
          # this to check whether the kernel parameters are correctly handled:
@@ -89,11 +96,13 @@ def test_default(self):
          wait_for_console_pattern(self, 'Run /init as init process')
def test_mac(self):
+        '''Check whether the guest uses file name based on its MAC address'''
          self.pxelinux_launch(pl_name='01-02-ca-fe-ba-be-42',
                               extra_opts='mac=02:ca:fe:ba:be:42,loadparm=3')
          wait_for_console_pattern(self, 'Linux version 5.3.7-301.fc31.s390x')
def test_uuid(self):
+        '''Check whether the guest uses file name based on its UUID'''
          # Also add a non-bootable disk to check the fallback to network boot:
          self.vm.add_args('-blockdev', 'null-co,size=65536,node-name=d1',
                           '-device', 
'virtio-blk,drive=d1,bootindex=0,loadparm=1',
@@ -102,11 +111,13 @@ def test_uuid(self):
          wait_for_console_pattern(self, 'Debian 4.19.146-1 (2020-09-17)')
def test_ip(self):
+        '''Check whether the guest uses file name based on its IP address'''
          self.vm.add_args('-M', 'loadparm=3')
          self.pxelinux_launch(pl_name='0A00020F')
          wait_for_console_pattern(self, 'Linux version 5.3.7-301.fc31.s390x')
def test_menu(self):
+        '''Check whether the boot menu works for pxelinux.cfg booting'''
          self.vm.add_args('-boot', 'menu=on,splash-time=10')
          self.pxelinux_launch(pl_name='0A00')
          wait_for_console_pattern(self, '[1] Nonexisting')


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