[virt-tools-list] [virt-manager PATCH 1/2] domain: add support to rename domain with nvram vars file

[Pavel Hrdina]

Libvirt storage API doesn't support renaming storage volumes so
we need to copy the nvram file and remove the old one.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1368922

Signed-off-by: Pavel Hrdina <phrdina at redhat.com>
---
 virtManager/details.py |  3 ++-
 virtManager/domain.py  | 47 ++++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 48 insertions(+), 2 deletions(-)

diff --git a/virtManager/details.py b/virtManager/details.py
index d6fef967..0b2754d8 100644
--- a/virtManager/details.py
+++ b/virtManager/details.py
@@ -1975,7 +1975,8 @@ class vmmDetails(vmmGObjectUI):
         # This needs to be last
         if self.edited(EDIT_NAME):
             # Renaming is pretty convoluted, so do it here synchronously
-            self.vm.define_name(self.widget("overview-name").get_text())
+            self.vm.rename_domain(self.widget("overview-name").get_text(),
+                                  kwargs)
 
             if not kwargs and not hotplug_args:
                 # Saves some useless redefine attempts
diff --git a/virtManager/domain.py b/virtManager/domain.py
index 336584e5..79303890 100644
--- a/virtManager/domain.py
+++ b/virtManager/domain.py
@@ -32,6 +32,7 @@ from virtinst import DomainSnapshot
 from virtinst import Guest
 from virtinst import util
 from virtinst import VirtualController
+from virtinst import VirtualDisk
 
 from .libvirtobject import vmmLibvirtObject
 
@@ -557,6 +558,42 @@ class vmmDomain(vmmLibvirtObject):
     # Persistent XML change APIs #
     ##############################
 
+    def rename_domain(self, new_name, kwargs):
+        old_name = self.get_name()
+
+        self.define_name(new_name)
+
+        # We need to do this copy magic because there is no Libvirt storage API
+        # to rename storage volume.
+        try:
+            old_nvram = VirtualDisk(self.conn.get_backend())
+            old_nvram.path = self.get_xmlobj().os.nvram
+
+            nvram_dir = os.path.dirname(old_nvram.path)
+            new_nvram_path = os.path.join(nvram_dir, "%s_VARS.fd" % new_name)
+
+            new_nvram = VirtualDisk(self.conn.get_backend())
+            new_nvram.path = new_nvram_path
+
+            nvram_install = VirtualDisk.build_vol_install(
+                    self.conn.get_backend(), os.path.basename(new_nvram.path),
+                    new_nvram.get_parent_pool(), new_nvram.get_size(), False)
+            nvram_install.input_vol = old_nvram.get_vol_object()
+            nvram_install.sync_input_vol(only_format=True)
+
+            new_nvram.set_vol_install(nvram_install)
+            new_nvram.validate()
+            new_nvram.setup()
+        except Exception as e:
+            self.define_name(old_name)
+            raise RuntimeError("Cannot rename nvram VARS: '%s'" % e)
+
+        kwargs["nvram"] = new_nvram_path
+        try:
+            old_nvram.get_vol_object().delete(0)
+        except Exception as e:
+            logging.debug("old nvram file was not removed: '%s'", e)
+
     # Device Add/Remove
     def add_device(self, devobj):
         """
@@ -621,7 +658,8 @@ class vmmDomain(vmmLibvirtObject):
         self._redefine_xmlobj(guest)
 
     def define_overview(self, machine=_SENTINEL, description=_SENTINEL,
-        title=_SENTINEL, idmap_list=_SENTINEL, loader=_SENTINEL):
+        title=_SENTINEL, idmap_list=_SENTINEL, loader=_SENTINEL,
+        nvram=_SENTINEL):
         guest = self._make_xmlobj_to_define()
         if machine != _SENTINEL:
             guest.os.machine = machine
@@ -644,6 +682,9 @@ class vmmDomain(vmmLibvirtObject):
                 guest.os.loader_type = "pflash"
                 guest.os.loader_ro = True
 
+        if nvram != _SENTINEL and guest.os.loader is not None:
+            guest.os.nvram = nvram
+
         if idmap_list != _SENTINEL:
             if idmap_list is not None:
                 # pylint: disable=unpacking-non-sequence
@@ -1434,6 +1475,10 @@ class vmmDomain(vmmLibvirtObject):
             if (self.get_xmlobj().os.loader_ro is True and
                 self.get_xmlobj().os.loader_type == "pflash"):
                 flags |= getattr(libvirt, "VIR_DOMAIN_UNDEFINE_NVRAM", 0)
+        else:
+            if (self.get_xmlobj().os.loader_ro is True and
+                self.get_xmlobj().os.loader_type == "pflash"):
+                flags |= getattr(libvirt, "VIR_DOMAIN_UNDEFINE_KEEP_NVRAM", 0)
         try:
             self._backend.undefineFlags(flags)
         except libvirt.libvirtError:
-- 
2.12.0