[virt-tools-list] [PATCH v2] virt-manager: ignore VIR_ERR_NO_DOMAIN when a domain was just deleted

[Giuseppe Scrivano]

Some callbacks could try to access a domain that was just deleted and
not accessible anymore.  Detect these cases and don't propagate the
exception.

Signed-off-by: Giuseppe Scrivano <gscrivan at redhat.com>
---
This error appeared in some other cases, that are fixed by the patch now.

I have tried to put the entire logic in a separate function (i.e. having a
inhibit_libvirt_error which contains the try/except code) but it didn't
seem readable, so I preferred the following version:

 virtManager/details.py   | 10 ++++++++--
 virtManager/domain.py    | 13 ++++++++-----
 virtManager/manager.py   | 29 ++++++++++++++++++-----------
 virtManager/uihelpers.py |  4 ++++
 4 files changed, 38 insertions(+), 18 deletions(-)

diff --git a/virtManager/details.py b/virtManager/details.py
index c8103db..35b8238 100644
--- a/virtManager/details.py
+++ b/virtManager/details.py
@@ -2637,8 +2637,14 @@ class vmmDetails(vmmGObjectUI):
 
         # If the dialog is visible, we want to make sure the XML is always
         # up to date
-        if self.is_visible():
-            self.vm.refresh_xml()
+        try:
+            if self.is_visible():
+                self.vm.refresh_xml()
+        except libvirt.libvirtError, e:
+            if uihelpers.exception_is_libvirt_error(e, "VIR_ERR_NO_DOMAIN"):
+                self.close()
+                return
+            raise
 
         # Stats page needs to be refreshed every tick
         if (page == PAGE_DETAILS and
diff --git a/virtManager/domain.py b/virtManager/domain.py
index 234cf4a..ff57fbc 100644
--- a/virtManager/domain.py
+++ b/virtManager/domain.py
@@ -411,7 +411,12 @@ class vmmDomain(vmmLibvirtObject):
                               parsexml=xml)
 
     def _reparse_xml(self, ignore=None):
-        self._guest = self._build_guest(self._get_domain_xml())
+        try:
+            self._guest = self._build_guest(self._get_domain_xml())
+        except libvirt.libvirtError, e:
+            if uihelpers.exception_is_libvirt_error(e, "VIR_ERR_NO_DOMAIN"):
+                return
+            raise
 
 
     ##############################
@@ -1561,14 +1566,12 @@ class vmmDomain(vmmLibvirtObject):
         """
         try:
             info = self._backend.info()
+            self._update_status(info[0])
         except libvirt.libvirtError, e:
-            if (hasattr(libvirt, "VIR_ERR_NO_DOMAIN") and
-                e.get_error_code() == getattr(libvirt, "VIR_ERR_NO_DOMAIN")):
-                # Possibly a transient domain that was removed on shutdown
+            if uihelpers.exception_is_libvirt_error(e, "VIR_ERR_NO_DOMAIN"):
                 return
             raise
 
-        self._update_status(info[0])
 
     def _update_status(self, status):
         """
diff --git a/virtManager/manager.py b/virtManager/manager.py
index bf83427..9116a32 100644
--- a/virtManager/manager.py
+++ b/virtManager/manager.py
@@ -34,6 +34,7 @@ from virtManager.connection import vmmConnection
 from virtManager.baseclass import vmmGObjectUI
 from virtManager.graphwidgets import CellRendererSparkline
 
+import libvirt
 
 # Number of data points for performance graphs
 GRAPH_LEN = 40
@@ -891,18 +892,24 @@ class vmmManager(vmmGObjectUI):
         if self.vm_row_key(vm) not in self.rows:
             return
 
-        row = self.rows[self.vm_row_key(vm)]
-        row[ROW_NAME] = vm.get_name()
-        row[ROW_STATUS] = vm.run_status()
-        row[ROW_STATUS_ICON] = vm.run_status_icon_name()
-        row[ROW_IS_VM_RUNNING] = vm.is_active()
-        row[ROW_MARKUP] = self._build_vm_markup(row)
 
-        if config_changed:
-            desc = vm.get_description()
-            if not can_set_row_none:
-                desc = desc or ""
-            row[ROW_HINT] = util.xml_escape(desc)
+        try:
+            row = self.rows[self.vm_row_key(vm)]
+            row[ROW_NAME] = vm.get_name()
+            row[ROW_STATUS] = vm.run_status()
+            row[ROW_STATUS_ICON] = vm.run_status_icon_name()
+            row[ROW_IS_VM_RUNNING] = vm.is_active()
+            row[ROW_MARKUP] = self._build_vm_markup(row)
+
+            if config_changed:
+                desc = vm.get_description()
+                if not can_set_row_none:
+                    desc = desc or ""
+                    row[ROW_HINT] = util.xml_escape(desc)
+        except libvirt.libvirtError, e:
+            if uihelpers.exception_is_libvirt_error(e, "VIR_ERR_NO_DOMAIN"):
+                return
+            raise
 
         model.row_changed(row.path, row.iter)
 
diff --git a/virtManager/uihelpers.py b/virtManager/uihelpers.py
index 3fd0ed8..5320ced 100644
--- a/virtManager/uihelpers.py
+++ b/virtManager/uihelpers.py
@@ -1345,3 +1345,7 @@ def default_uri(always_system=False):
         else:
             return "qemu:///session"
     return None
+
+def exception_is_libvirt_error(e, error):
+    return (hasattr(libvirt, error) and
+            e.get_error_code() == getattr(libvirt, error))
-- 
1.8.3.1