Merge remote branch 'cros/upstream' into tempbranch

client/tests/kvm/tests/mac_change.py

Index: client/tests/kvm/tests/mac_change.py
diff --git a/client/tests/kvm/tests/mac_change.py b/client/tests/kvm/tests/mac_change.py
new file mode 100644
index 0000000000000000000000000000000000000000..c614e1568179bcaa231afb21bcdeb4f466e2f816
--- /dev/null
+++ b/client/tests/kvm/tests/mac_change.py
@@ -0,0 +1,65 @@
+import logging
+from autotest_lib.client.common_lib import error
+import kvm_utils, kvm_test_utils
+
+
+def run_mac_change(test, params, env):
+    """
+    Change MAC address of guest.
+
+    1) Get a new mac from pool, and the old mac addr of guest.
+    2) Set new mac in guest and regain new IP.
+    3) Re-log into guest with new MAC.
+
+    @param test: KVM test object.
+    @param params: Dictionary with the test parameters.
+    @param env: Dictionary with test environment.
+    """
+    timeout = int(params.get("login_timeout", 360))
+    vm = kvm_test_utils.get_living_vm(env, params.get("main_vm"))
+    logging.info("Trying to log into guest '%s' by serial", vm.name)
+    session = kvm_utils.wait_for(lambda: vm.serial_login(),
+                                  timeout, 0, step=2)
+    if not session:
+        raise error.TestFail("Could not log into guest '%s'" % vm.name)
+
+    old_mac = vm.get_mac_address(0)
+    while True:
+        vm.free_mac_address(0)
+        new_mac = kvm_utils.generate_mac_address(vm.instance, 0)
+        if old_mac != new_mac:
+            break
+    logging.info("The initial MAC address is %s", old_mac)
+    interface = kvm_test_utils.get_linux_ifname(session, old_mac)
+    # Start change MAC address
+    logging.info("Changing MAC address to %s", new_mac)
+    change_cmd = ("ifconfig %s down && ifconfig %s hw ether %s && "
+                  "ifconfig %s up" % (interface, interface, new_mac, interface))
+    if session.get_command_status(change_cmd) != 0:
+        raise error.TestFail("Fail to send mac_change command")
+
+    # Verify whether MAC address was changed to the new one
+    logging.info("Verifying the new mac address")
+    if session.get_command_status("ifconfig | grep -i %s" % new_mac) != 0:
+        raise error.TestFail("Fail to change MAC address")
+
+    # Restart `dhclient' to regain IP for new mac address
+    logging.info("Restart the network to gain new IP")
+    dhclient_cmd = "dhclient -r && dhclient %s" % interface
+    session.sendline(dhclient_cmd)
+
+    # Re-log into the guest after changing mac address
+    if kvm_utils.wait_for(session.is_responsive, 120, 20, 3):
+        # Just warning when failed to see the session become dead,
+        # because there is a little chance the ip does not change.
+        logging.warn("The session is still responsive, settings may fail.")
+    session.close()
+
+    # Re-log into guest and check if session is responsive
+    logging.info("Re-log into the guest")
+    session = kvm_test_utils.wait_for_login(vm,
+              timeout=int(params.get("login_timeout", 360)))
+    if not session.is_responsive():
+        raise error.TestFail("The new session is not responsive.")
+
+    session.close()