Fix the FileNotFoundError of get_model_features()

  There is no /usr/share/libvirt/cpu_map.xml file existing on RHEL8，
  but instead of this file with /usr/share/libvirt/cpu_map directory.
  If a test which calls the get_model_features() is runned on RHEL8,
  an FileNotFoundError will be thrown resulting in making this test
  failed.

Signed-off-by: Yanghang Liu <[email protected]>

virttest/libvirt_version.py

@@ -0,0 +1,52 @@
+"""
+Shared code for tests that need to get the libvirt version
+"""
+
+import re
+import logging
+
+from avocado.utils import process
+
+LIBVIRT_LIB_VERSION = 0
+
+
+def version_compare(major, minor, update):
+    """
+    Determine/use the current libvirt library version on the system
+    and compare input major, minor, and update values against it.
+    If the running version is greater than or equal to the input
+    params version, then return True; otherwise, return False
+
+    This is designed to handle upstream version comparisons for
+    test adjustments and/or comparisons as a result of upstream
+    fixes or changes that could impact test results.
+
+    :param major: Major version to compare against
+    :param minor: Minor version to compare against
+    :param update: Update value to compare against
+    :return: True if running version is greater than or
+                  equal to the input libvirt version
+    """
+    global LIBVIRT_LIB_VERSION
+
+    if LIBVIRT_LIB_VERSION == 0:
+        try:
+            regex = r'[Uu]sing\s*[Ll]ibrary:\s*[Ll]ibvirt\s*'
+            regex += r'(\d+)\.(\d+)\.(\d+)'
+            lines = process.run("virsh version").stdout_text.splitlines()
+            for line in lines:
+                mobj = re.search(regex, line)
+                if bool(mobj):
+                    LIBVIRT_LIB_VERSION = int(mobj.group(1)) * 1000000 + \
+                        int(mobj.group(2)) * 1000 + \
+                        int(mobj.group(3))
+                    break
+        except (ValueError, TypeError, AttributeError):
+            logging.warning("Error determining libvirt version")
+            return False
+
+    compare_version = major * 1000000 + minor * 1000 + update
+
+    if LIBVIRT_LIB_VERSION >= compare_version:
+        return True
+    return False

virttest/utils_misc.py

@@ -72,6 +72,7 @@
 from virttest import utils_selinux
 from virttest import utils_disk
 from virttest import logging_manager
+from virttest import libvirt_version
 from virttest.staging import utils_koji
 from virttest.staging import service
 from virttest.xml_utils import XMLTreeFile
@@ -4035,7 +4036,8 @@ def setup_remote(self):
 
 def get_model_features(model_name):
     """
-    /usr/share/libvirt/cpu_map.xml defines all CPU models.
+    libvirt-4.5.0 :/usr/share/libvirt/cpu_map.xml defines all CPU models.
+    libvirt-5.0.0 :/usr/share/libvirt/cpu_map/ defines all CPU models.
     One CPU model is a set of features.
     This function is to get features of one specific model.
 
@@ -4045,26 +4047,37 @@ def get_model_features(model_name):
     """
     features = []
     conf = "/usr/share/libvirt/cpu_map.xml"
+    conf_dir = "/usr/share/libvirt/cpu_map/"
 
     try:
-        output = open(conf, 'r').read()
-        root = ET.fromstring(output)
-        # Find model
-        for model_n in root.findall('arch/model'):
-            if model_n.get('name') == model_name:
-                model_node = model_n
-                for feature in model_n.findall('feature'):
-                    features.append(feature.get('name'))
-                break
-        # Handle nested model
-        nested_model = model_node.find('model')
-        if nested_model is not None:
-            nested_model_name = nested_model.get('name')
-            for model_n in root.findall('arch/model'):
-                if model_n.get('name') == nested_model_name:
-                    for feature in model_n.findall('feature'):
-                        features.append(feature.get('name'))
-                    break
+        if not libvirt_version.version_compare(5, 0, 0):
+            with open(conf, 'r') as output:
+                root = ET.fromstring(output.read())
+                while True:
+                    # Find model in file /usr/share/libvirt/cpu_map.xml
+                    for model_n in root.findall('arch/model'):
+                        if model_n.get('name') == model_name:
+                            model_node = model_n
+                            for feature in model_n.findall('feature'):
+                                features.append(feature.get('name'))
+                            break
+                    # Handle nested model
+                    if model_node.find('model') is not None:
+                        model_name = model_node.find('model').get('name')
+                        continue
+                    else:
+                        break
+
+        else:
+            # Find model in dir /usr/share/libvirt/cpu_map
+            filelist = os.listdir(conf_dir)
+            for file_name in filelist:
+                if model_name in file_name:
+                    with open(os.path.join(conf_dir, file_name), "r") as output:
+                        model = ET.fromstring(output.read())
+                        for feature in model.findall("model/feature"):
+                            features.append(feature.get('name'))
+                        break
     except ET.ParseError as error:
         logging.warn("Configuration file %s has wrong xml format" % conf)
         raise