qemu.tests: Add a new subtest multi_nics_verify

Verify guest NIC numbers again whats provided in test config file.
If the guest NICs info does not match whats in the params at first,
try to tune up the config file and reboot and then verify again.
Signed-off-by: NKen Cao <kcao@redhat.com>
Signed-off-by: NYolkfull Chow <yzhou@redhat.com>

qemu/tests/cfg/multi_nics_verify.cfg

+- multi_nics_verify: guest_test.arp_set
+    virt_test_type = qemu
+    type = multi_nics_verify
+    only Linux
+    no RHEL.3.9
+    nics += ' nic2 nic3 nic4 nic5 nic6 nic7 nic8'
+    kill_vm = no
+    mac_filter = "HWaddr (.\w+:\w+:\w+:\w+:\w+:\w+)"
+    ip_filter = "inet addr:(.\d+.\d+.\d+.\d+)"
+    net_check_cmd = "ifconfig"
+    strick_check = ""
+    flood_minutes = 1
+    transfer_timeout = 1000
+    reboot = yes

qemu/tests/multi_nics_verify.py

+import os, logging, re
+from autotest.client.shared import error
+from virttest import utils_test
+
+
+@error.context_aware
+def run_multi_nics_verify(test, params, env):
+    """
+    Verify guest NIC numbers again whats provided in test config file.
+
+    If the guest NICs info does not match whats in the params at first,
+    try to fix these by operating the networking config file.
+    1. Boot guest with multi NICs.
+    2. Check whether guest NICs info match with params setting.
+    3. Create configure file for every NIC interface in guest.
+    4. Reboot guest.
+    5. Check whether guest NICs info match with params setting.
+
+    @param test: QEMU test object
+    @param params: Dictionary with the test parameters
+    @param env: Dictionary with test environment.
+    """
+    # A helper function for getting NICs counts from ifconfig output of guest
+    def get_nics_list(session):
+        s, o = session.get_command_status_output("ifconfig")
+        if s != 0:
+            raise error.TestError("Running command 'ifconfig' failed in guest"
+                                  " with output %s" % o)
+
+        logging.debug("The ifconfig ouput from guest is:\n%s" % o)
+
+        nics_list = re.findall(r'eth(\d+)\s+Link', o, re.M)
+        logging.info("NICs list: %s" % nics_list)
+
+        return nics_list
+
+
+    # A helper function for checking NICs number
+    def check_nics_num(expect_c, session):
+        txt = "Check whether guest NICs info match with params setting."
+        error.context(txt, logging.info)
+        nics_list = get_nics_list(session)
+        actual_c = len(nics_list)
+        msg = "Expect NICs nums are: %d\nPractical NICs nums are: %d\n" % \
+                                                       (expect_c, actual_c)
+
+        if not expect_c == actual_c:
+            msg += "Nics count mismatch!\n"
+            return (False, msg)
+        return (True, msg+'Nics count match')
+
+
+    vm = env.get_vm(params["main_vm"])
+    vm.verify_alive()
+    session = vm.wait_for_login(timeout=int(params.get("login_timeout", 360)))
+    # Redirect ifconfig output from guest to log file
+    log_file = os.path.join(test.debugdir, "ifconfig")
+    utils_test.dump_command_output(session, "ifconfig", log_file)
+
+    # Get the ethernet cards number from params
+    nics_num = len(params.objects("nics"))
+    logging.info("[ %s ] NICs card specified in config file" % nics_num)
+
+    # Pre-judgement for the ethernet interface
+    logging.debug(check_nics_num(nics_num, session)[1])
+    txt = "Create configure file for every NIC interface in guest."
+    error.context(txt, logging.info)
+    ifcfg_prefix = "/etc/sysconfig/network-scripts/ifcfg-eth"
+    for num in range(nics_num):
+        eth_config_path = "".join([ifcfg_prefix, str(num)])
+
+        eth_config = """DEVICE=eth%s
+BOOTPROTO=dhcp
+ONBOOT=yes
+""" % num
+
+        cmd = "echo '%s' > %s" % (eth_config, eth_config_path)
+        s, o = session.get_command_status_output(cmd)
+        if s != 0:
+            raise error.TestError("Failed to create ether config file: %s\n"
+                                  "Reason is: %s" % (eth_config_path, o))
+
+    # Reboot and check the configurations.
+    new_session = vm.reboot(session)
+    s, msg = check_nics_num(nics_num, new_session)
+    if not s:
+        raise error.TestFail(msg)
+
+    # NICs matched.
+    logging.info(msg)