Obtaing the ip address of the guest and update address cache

Few of the times it is seen that the ip address is not being fetch and the avocado runs were failed with error "ERROR: Failures occurred while postprocess:\n\n: Guest virt-tests-vm1 dmesg verification failed: Login timeout expired (output: 'exceeded 240 s timeout, last failure: No ipv4 DHCP lease for MAC aa:bb:cc:dd:ee:ff') "

To handle this error the patch has been sent. The patch helps in obtaining ip address of the guest using "virsh-net-dhcp-leases default" command. If the guest mac address is found in the command output, the mac ipv4 address is obatined and updated in the address.cache

Signed-off-by: Tasmiya Nalatwad <tasmiya@linux.vnet.ibm.com>

virttest/libvirt_vm.py

@@ -30,6 +30,7 @@
     test_setup,
     utils_logfile,
     utils_misc,
+    utils_net,
     utils_package,
     utils_selinux,
     virsh,
@@ -378,6 +379,15 @@ def backup_xml(self, active=False):
             LOG.error("Failed to backup xml file:\n%s", detail)
             return ""
 
+    def _get_address(self, index=0, ip_version="ipv4", session=None, timeout=60.0):
+        try:
+            return super()._get_address(index, ip_version, session, timeout)
+        except virt_vm.VMIPAddressMissingError:
+            mac = self.get_mac_address(index).lower()
+            ipaddr = utils_net.obtain_guest_ip_from_dhcp_leases(mac)
+            self.address_cache[mac] = ipaddr
+            return ipaddr
+
     def clone(
         self,
         name=None,

virttest/utils_net.py

@@ -35,6 +35,7 @@
     utils_misc,
     utils_package,
     utils_selinux,
+    virsh,
 )
 from virttest.remote import RemoteRunner
 from virttest.staging import service, utils_memory
@@ -4889,3 +4890,21 @@ def check_class_rules(ifname, rule_id, bandwidth, expect_none=False):
         stacktrace.log_exc_info(sys.exc_info())
         return False
     return True
+
+
+def obtain_guest_ip_from_dhcp_leases(mac):
+    """
+    Obtaining the guest ip address from virsh-net-dhcp-leases command
+    :param: Mac address of the guest
+    :return: return ip-address if found for given mac in the
+             virsh-net-dhcp-leases default table, else return None
+    """
+    output = virsh.net_dhcp_leases("default")
+    lines = output.stdout.splitlines()
+    for line in lines:
+        if mac in line:
+            parts = line.split()
+            for part in parts:
+                if "/" in part:
+                    return part.split("/")[0]
+    return None