[Xen-changelog] [xen-unstable] Fix blkif.py for virsh start

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

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1212658229 -3600
# Node ID bbb4bb69efb25c15067ae7f294bd23f512081710
# Parent  5603534c62f922b0106f2291100fbf135d69d072
Fix blkif.py for virsh start

I defined a cdrom to a guest domain as follows.

  ",hdc:cdrom,r"

When the guest domain was created by using xm create command, uname
of the cdrom was ''.  Then creating the guest domain succeeded.

[2008-06-03 15:23:41 xend.XendDomainInfo 25956] DEBUG
(XendDomainInfo:200)
XendDomainInfo.create(['vm', ['name', 'rhel5.2ga_hvm_lvol1'],
<<snip>>
['device', ['vbd', ['uname', ''], ['dev', 'hdc:cdrom'], ['mode',
'r']]],
<<snip>>

But, when the guest domain was created by using virsh start command,
uname of the cdrom was None.  Then creating the guest domain failed.

[2008-06-03 15:22:10 xend.XendDomainInfo 25559] DEBUG
(XendDomainInfo:200)
XendDomainInfo.create(['vm', ['name', 'rhel5.2ga_hvm_lvol1'],
<<snip>>
['device', ['vbd', ['dev', 'hdc:cdrom'], ['mode', 'r']]],
<<snip>>

This patch fixes to be able to create guest domains by both xm create
command and virsh start command.

FYI:
"if uname is None:" --> "if uname == '':" --> "if not uname:"
   till CS#17625             current           by this patch

Signed-off-by: Masaki Kanno <kanno.masaki@xxxxxxxxxxxxxx>
---
 tools/python/xen/xend/server/blkif.py |    2 +-
 1 files changed, 1 insertion(+), 1 deletion(-)

diff -r 5603534c62f9 -r bbb4bb69efb2 tools/python/xen/xend/server/blkif.py
--- a/tools/python/xen/xend/server/blkif.py     Tue Jun 03 09:41:19 2008 +0100
+++ b/tools/python/xen/xend/server/blkif.py     Thu Jun 05 10:30:29 2008 +0100
@@ -47,7 +47,7 @@ class BlkifController(DevController):
         except ValueError:
             dev_type = "disk"
 
-        if uname == '':
+        if not uname:
             if dev_type == 'cdrom':
                 (typ, params) = ("", "")
             else:

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