[Xen-changelog] Support removing nodes from store if value to store is None.

[Xen patchbot -unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User cl349@xxxxxxxxxxxxxxxxxxxx
# Node ID 960d4f6b58b3fb4d3dab82f98254fa3e6bcbe52a
# Parent  f92bdd9153f54583512635ced9d5a8812233f29e
Support removing nodes from store if value to store is None.
Signed-off-by: Christian Limpach <Christian.Limpach@xxxxxxxxxxxx>

diff -r f92bdd9153f5 -r 960d4f6b58b3 
tools/python/xen/xend/xenstore/xstransact.py
--- a/tools/python/xen/xend/xenstore/xstransact.py      Wed Sep 14 19:22:31 2005
+++ b/tools/python/xen/xend/xenstore/xstransact.py      Wed Sep 14 19:29:25 2005
@@ -113,7 +113,7 @@
             else:
                 (key, fn, defval) = tup
             try:
-                val = fn(self.read(key))
+                val = fn(self._read(key))
             except TypeError:
                 val = defval
             ret.append(val)
@@ -128,12 +128,16 @@
                 try:
                     fmt = { str : "%s",
                             int : "%i",
-                            float : "%f" }[type(val)]
+                            float : "%f",
+                            type(None) : None }[type(val)]
                 except KeyError:
                     raise TypeError
             else:
                 (key, val, fmt) = tup
-            self.write(key, fmt % val)
+            if val:
+                self._write(key, fmt % val)
+            else:
+                self._remove(key)
 
 
     def Read(cls, path, *args):

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