XEN and Fedora-19 domU

Marcel J.E. Mol marcel at mesa.nl
Wed Jun 26 18:40:25 UTC 2013

Hi there,

I setup Fedora19-Beta (plus updates) as a XEN server and installed a
Fedora 19 as a domU client.

Unfortunately the domU client failed to boot. After some investigation
it turned out to be the grub.cfg file in the client that caused XEN
pygrub to fail.

The fix is not to difficult and I posted a git patch to the XEN devel list.
This patch might make it into XEN 4.3, but I guess XEN 4.3 will not
be part of Fedora 19.

I guess it would be a shame if Fedora 19 cannot be used as a XEN client so
maybe the patch can be added to the Fedora xen tree?

This is the patch as send to the XEN list:

Date: Sat, 22 Jun 2013 22:33:55 +0200
Subject: [PATCH] pygrub/GrubConf: fix boot problem for fedora 19 grub.cfg

Booting a fedora 19 domU failed because a it could not properly
parse the grub.cfg file. This was cased by

	set default="${next_entry}"

This statement actually is within an 'if' statement, so maybe it would
be better to skip code within if/fi blocks...
But this patch seems to work fine.

Signed-off-by: Marcel Mol <marcel at mesa.nl>
 tools/pygrub/src/GrubConf.py |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/tools/pygrub/src/GrubConf.py b/tools/pygrub/src/GrubConf.py
index 629951f..6324c62 100644
--- a/tools/pygrub/src/GrubConf.py
+++ b/tools/pygrub/src/GrubConf.py
@@ -427,6 +427,8 @@ class Grub2ConfigFile(_GrubConfigFile):
                 if self.commands[com] is not None:
                     if arg.strip() == "${saved_entry}":
                         arg = "0"
+                    elif arg.strip() == "${next_entry}":
+                        arg = "0"
                     setattr(self, self.commands[com], arg.strip())
                     logging.info("Ignored directive %s" %(com,))


     ======--------         Marcel J.E. Mol                MESA Consulting B.V.
    =======---------        ph. +31-(0)6-54724868          P.O. Box 112
    =======---------        marcel at mesa.nl                 2630 AC  Nootdorp
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