tests/functional/x86_64: Limit the memlock test to Linux hosts

The memlock test analyzes /proc/*/status files and expects the layout
from Linux in there. However, these files also exist on NetBSD hosts
with a completely different layout, causing this test to fail. Thus
limit the test to Linux hosts now. We already have a decorator to
skip a test if it is running on a certain host system, but in this
case, we rather want to skip if we are not running on a specific
host system, so introduce a new @skipUnlessOperatingSystem decorator
for this job.

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20260121111140.99482-1-thuth@redhat.com>

tests/functional/qemu_test/__init__.py

@@ -15,8 +15,8 @@ from .testcase import QemuBaseTest, QemuUserTest, QemuSystemTest
 from .linuxkernel import LinuxKernelTest
 from .decorators import skipIfMissingCommands, skipIfNotMachine, \
     skipFlakyTest, skipUntrustedTest, skipBigDataTest, skipSlowTest, \
-    skipIfMissingImports, skipIfOperatingSystem, skipLockedMemoryTest, \
-    skipIfMissingEnv
+    skipIfMissingImports, skipIfOperatingSystem, skipUnlessOperatingSystem, \
+    skipLockedMemoryTest, skipIfMissingEnv
 from .archive import archive_extract
 from .uncompress import uncompress
 from .gdb import GDB

tests/functional/qemu_test/decorators.py

@@ -57,6 +57,18 @@ def skipIfOperatingSystem(*args):
                   'running on an OS (%s) that is not able to run this test' %
                   ", ".join(args))
 
+def skipUnlessOperatingSystem(*args):
+    '''
+    Decorator to skip execution of a test if the current host
+    operating system does not match one of the allowed ones.
+    Example:
+
+      @skipUnlessOperatingSystem("Linux", "Darwin")
+    '''
+    return skipUnless(platform.system() in args,
+                  'not running on one of the required operating systems (%s)' %
+                  ", ".join(args))
+
 def skipIfNotMachine(*args):
     '''
     Decorator to skip execution of a test if the current

tests/functional/x86_64/test_memlock.py

@@ -14,12 +14,13 @@ import re
 from typing import Dict
 
 from qemu_test import QemuSystemTest
-from qemu_test import skipLockedMemoryTest
+from qemu_test import skipLockedMemoryTest, skipUnlessOperatingSystem
 
 
 STATUS_VALUE_PATTERN = re.compile(r'^(\w+):\s+(\d+) kB', re.MULTILINE)
 
 
+@skipUnlessOperatingSystem('Linux')
 @skipLockedMemoryTest(2_097_152)  # 2GB
 class MemlockTest(QemuSystemTest):
     """