[Kimchi-devel] [PATCH] [Kimchi] Clean FEATURETEST_VM effectively.

[pvital at linux.vnet.ibm.com]

From: Paulo Vital <pvital at linux.vnet.ibm.com>

FEATURETEST_VM is defined at Kimchi start up to check if few QEMU and Libvirt
features are enabled in the host system. Some bugs reported the existence of
this VM running in the system, even after the Kimchi Feature Tests have
completed.

This patch adds a cleaning step before start the Kimchi Feature Tests. In
addition, modified the has_mem_hotplug_support() to not use RollbackContext and
guarantee that FEATURETEST_VM will be undefined.

Signed-off-by: Paulo Vital <pvital at linux.vnet.ibm.com>
---
 model/config.py       |  3 +++
 model/featuretests.py | 33 +++++++++++++++++----------------
 2 files changed, 20 insertions(+), 16 deletions(-)

diff --git a/model/config.py b/model/config.py
index fc4b285..78cdaeb 100644
--- a/model/config.py
+++ b/model/config.py
@@ -57,6 +57,9 @@ class CapabilitiesModel(object):
         self.mem_hotplug_support = False
         self.libvirtd_running = False

+        # make sure there're no Kimchi leftovers from previous executions
+        self._clean_leftovers()
+
         # run feature tests
         self._set_capabilities()

diff --git a/model/featuretests.py b/model/featuretests.py
index 2b680c3..fca152d 100644
--- a/model/featuretests.py
+++ b/model/featuretests.py
@@ -24,7 +24,6 @@ import platform
 import subprocess
 from lxml.builder import E

-from wok.rollbackcontext import RollbackContext
 from wok.utils import run_command, servermethod, wok_log


@@ -220,22 +219,24 @@ class FeatureTests(object):
         # Libvirt < 1.2.14 does not support memory devices, so try to attach a
         # device. Then check if QEMU (>= 2.1) supports memory hotplug, starting
         # the guest These steps avoid errors with Libvirt 'test' driver for KVM
-        with RollbackContext() as rollback:
+        conn_type = conn.getType().lower()
+        domain_type = 'test' if conn_type == 'test' else 'kvm'
+        arch = 'i686' if conn_type == 'test' else platform.machine()
+        arch = 'ppc64' if arch == 'ppc64le' else arch
+
+        dom = None
+        try:
             FeatureTests.disable_libvirt_error_logging()
-            rollback.prependDefer(FeatureTests.enable_libvirt_error_logging)
-            conn_type = conn.getType().lower()
-            domain_type = 'test' if conn_type == 'test' else 'kvm'
-            arch = 'i686' if conn_type == 'test' else platform.machine()
-            arch = 'ppc64' if arch == 'ppc64le' else arch
             dom = conn.defineXML(MAXMEM_VM_XML % {'name': FEATURETEST_VM_NAME,
                                                   'domain': domain_type,
                                                   'arch': arch})
-            rollback.prependDefer(dom.undefine)
-            try:
-                dom.attachDeviceFlags(DEV_MEM_XML,
-                                      libvirt.VIR_DOMAIN_MEM_CONFIG)
-                dom.create()
-                rollback.prependDefer(dom.destroy)
-                return True
-            except libvirt.libvirtError:
-                return False
+            dom.attachDeviceFlags(DEV_MEM_XML, libvirt.VIR_DOMAIN_MEM_CONFIG)
+            dom.create()
+        except libvirt.libvirtError:
+            return False
+        finally:
+            if (dom and dom.isActive() == 1):
+                dom.destroy()
+            dom is None or dom.undefine()
+            FeatureTests.enable_libvirt_error_logging()
+        return True
--
2.5.5