vm: drop old is_outdated/commit_changes

This code is unused now. Theoretically this is_outdated implementation
should be moved to FileVolume, but since we don't have VM reference
there, it isn't possible to read appropriate xenstore entry. As we're
phasing out file pool, simply ignore it for now.

QubesOS/qubes-issues#2256

qubes/vm/qubesvm.py

@@ -1643,45 +1643,6 @@ class QubesVM(qubes.vm.mix.net.NetVMMixin, qubes.vm.BaseVM):
 
         return None
 
-    def is_outdated(self):
-        '''Check whether domain needs restart to update root image from \
-            template.
-
-        :returns: :py:obj:`True` if is outdated, :py:obj:`False` otherwise.
-        :rtype: bool
-        '''
-        # pylint: disable=no-member
-
-        # Makes sense only on VM based on template
-        if self.template is None:
-            return False
-
-        if not self.is_running():
-            return False
-
-        if not hasattr(self.template, 'rootcow_img'):
-            return False
-
-        rootimg_inode = os.stat(self.template.root_img)
-        try:
-            rootcow_inode = os.stat(self.template.rootcow_img)
-        except OSError:
-            # The only case when rootcow_img doesn't exists is in the middle of
-            # commit_changes, so VM is outdated right now
-            return True
-
-        current_dmdev = "/dev/mapper/snapshot-{0:x}:{1}-{2:x}:{3}".format(
-                rootimg_inode[2], rootimg_inode[1],
-                rootcow_inode[2], rootcow_inode[1])
-
-        # FIXME
-        # 51712 (0xCA00) is xvda
-        #  backend node name not available through xenapi :(
-        used_dmdev = self.app.vmm.xs.read('',
-            '/local/domain/0/backend/vbd/{}/51712/node'.format(self.xid))
-
-        return used_dmdev != current_dmdev
-
     #
     # helper methods
     #

qubes/vm/templatevm.py

@@ -99,13 +99,3 @@ class TemplateVM(QubesVM):
             }
         }
         super(TemplateVM, self).__init__(*args, **kwargs)
-
-    def commit_changes(self):
-        '''Commit changes to template'''
-        self.log.debug('commit_changes()')
-
-        if not self.app.vmm.offline_mode:
-            assert not self.is_running(), \
-                'Attempt to commit changes on running Template VM!'
-
-        self.storage.commit()