try to get os info from redhat-release firstly

lisa/operating_system.py

@@ -1472,22 +1472,29 @@ class Redhat(Fedora):
         return 0 == result.exit_code
 
     def _get_information(self) -> OsInformation:
-        cmd_result = self._node.execute(
-            cmd="cat /etc/redhat-release", no_error_log=True, expected_exit_code=0
-        )
-        full_version = cmd_result.stdout
-        matches = self.__legacy_redhat_information_pattern.match(full_version)
-        assert matches, f"cannot match version information from: {full_version}"
-        assert matches.group("vendor")
-        information = OsInformation(
-            version=self._parse_version(matches.group("version")),
-            vendor=matches.group("vendor"),
-            release=matches.group("version"),
-            codename=matches.group("codename"),
-            full_version=full_version,
-        )
-        # remove Linux Server in vendor
-        information.vendor = get_matched_str(information.vendor, self.__vendor_pattern)
+        try:
+            cmd_result = self._node.execute(
+                cmd="cat /etc/redhat-release", no_error_log=True, expected_exit_code=0
+            )
+            full_version = cmd_result.stdout
+            matches = self.__legacy_redhat_information_pattern.match(full_version)
+            assert matches, f"cannot match version information from: {full_version}"
+            assert matches.group("vendor")
+            information = OsInformation(
+                version=self._parse_version(matches.group("version")),
+                vendor=matches.group("vendor"),
+                release=matches.group("version"),
+                codename=matches.group("codename"),
+                full_version=full_version,
+            )
+        except Exception:
+            information = super(Fedora, self)._get_information()
+
+            # remove Linux Server in vendor
+            information.vendor = get_matched_str(
+                information.vendor, self.__vendor_pattern
+            )
+
         return information
 
     def _update_packages(self, packages: Optional[List[str]] = None) -> None:

microsoft/testsuites/xdp/pktgen.py

@@ -143,6 +143,7 @@ class Pktgen(Tool):
             raise UnsupportedKernelException(self.node.os)
 
         # ['4', '18', '0', '305', '40', '1', 'el8_4', 'x86_64']
+        # ['4', '18', '0', '240', 'el8', 'x86_64']
         parts = kernel_information.version_parts[:]
 
         # Full example:
@@ -151,8 +152,8 @@ class Pktgen(Tool):
         #   4.18.0-240.1.1.el8_3.centos.plus.x86_64.rpm",
         rpm_location = (
             f"https://koji.mbox.centos.org/pkgs/packages/kernel-plus/4.18.0/"
-            f"{'.'.join(parts[3:7])}.centos.plus/{parts[7]}/kernel-plus-modules-"
-            f"internal-4.18.0-{'.'.join(parts[3:7])}.centos.plus.{parts[7]}.rpm"
+            f"{'.'.join(parts[3:-1])}.centos.plus/{parts[-1]}/kernel-plus-modules-"
+            f"internal-4.18.0-{'.'.join(parts[3:-1])}.centos.plus.{parts[-1]}.rpm"
         )
         # Install pkggen from CentOS for redhat, because there is no free
         # download for Redhat.