[Xen-changelog] Allow a guest to determine its VM UUID.

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

# HG changeset patch
# User emellor@xxxxxxxxxxxxxxxxxxxxxx
# Node ID 187180382772582f075d0e0f9da23843e0c9e2dd
# Parent  d809359ab32d3915f075b8417536d6890ab28ded
Allow a guest to determine its VM UUID.

Use xenstore-read $(xenstore-read vm)/uuid.

Signed-off-by: Ewan Mellor <ewan@xxxxxxxxxxxxx>
---
 tools/python/xen/xend/XendDomainInfo.py |   10 ++++++++++
 1 files changed, 10 insertions(+)

diff -r d809359ab32d -r 187180382772 tools/python/xen/xend/XendDomainInfo.py
--- a/tools/python/xen/xend/XendDomainInfo.py   Tue May 23 16:17:28 2006 +0100
+++ b/tools/python/xen/xend/XendDomainInfo.py   Tue May 23 16:23:10 2006 +0100
@@ -701,6 +701,16 @@ class XendDomainInfo:
         log.debug("Storing VM details: %s", to_store)
 
         self.writeVm(to_store)
+        self.setVmPermissions()
+
+
+    def setVmPermissions(self):
+        """Allow the guest domain to read its UUID.  We don't allow it to
+        access any other entry, for security."""
+        xstransact.SetPermissions('%s/uuid' % self.vmpath,
+                                  { 'dom' : self.domid,
+                                    'read' : True,
+                                    'write' : False })
 
 
     def storeDomDetails(self):

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