Update pytest mark on TestExtractVmImage

Signed-off-by: Jono Yang <jyang@nexb.com>

tests/test_vmimage.py

@@ -20,7 +20,31 @@
 from extractcode import vmimage
 
 
-@pytest.mark.skipif(not on_linux, reason='Only linux supports image extraction')
+def get_etc_os_release_info(os_release_path='/etc/os-release'):
+    cfg_kv = {}
+    with open(os_release_path) as f:
+        for line in f:
+            split_line = line.split('=')
+            if not split_line:
+                continue
+            k = split_line[0].strip()
+            v = split_line[-1].strip()
+            cfg_kv[k] = v
+    return cfg_kv
+
+
+def is_on_ubuntu_22():
+    if not on_linux:
+        return False
+    os_release_info = get_etc_os_release_info()
+    return os_release_info['ID'] == 'ubuntu' and '22' in os_release_info['VERSION_ID']
+
+on_ubuntu_22 = is_on_ubuntu_22()
+
+del is_on_ubuntu_22
+
+
+@pytest.mark.skipif(not on_linux or on_ubuntu_22, reason='Only linux supports image extraction, kernel is unreadable on Ubuntu 22.04')
 class TestExtractVmImage(BaseArchiveTestCase):
     test_data_dir = os.path.join(os.path.dirname(__file__), 'data')