[Libvir] [PATCH]Report the error from xend for Domain-0

[Kazuki Mizushima]

Hi, Dan

After I studying this issue, 
I change my mind about fixing method.
How do you think about this?

1)Change the scanning code from "Cannot" to "xend.err"

By the survey on xend_internal.c, I found 
Xend reports errors which surely has "xend.err" term,
For this reason, I want to change term from "Cannot" to "xend.err".

N.B.
When I try to grep xen/xend by "XendError", 
there are many error strings not catched above term.

With this fixes, virsh command can report error from Xend 
about the information of not only Dom0 but also DomX. 
(except going on next Driver & guarding at xm)  


2)String("xend.err") checking in HTTP return code (200) case
 
Also when http returns normal Status Code(OK, Created, Accepted),
I think that now it is better to check the content, because 
like below it is. 

# virsh restore a      (a is not existing)
Domain restored from a
# echo $?
0

But if the processing is not done, 
the cause is that http returns 200 status code though content has error 
strings.

Here is remaking patch.

Signed-off-by: Kazuki Mizushima <mizushima.kazuk at jp.fujitsu.com>

Thanks,
Kazuki Mizushima

Index: src/xend_internal.c
===================================================================
RCS file: /data/cvs/libvirt/src/xend_internal.c,v
retrieving revision 1.95
diff -u -p -r1.95 xend_internal.c
--- src/xend_internal.c 27 Feb 2007 15:50:03 -0000      1.95
+++ src/xend_internal.c 1 Mar 2007 11:04:46 -0000
@@ -511,7 +511,7 @@ xend_post(virConnectPtr xend, const char
     } else if ((ret == 202) && (strstr(content, "failed") != NULL)) {
         virXendError(xend, VIR_ERR_POST_FAILED, content);
         ret = -1;
-    } else if ((ret == 202) && (strstr(content, "Cannot") != NULL)) {
+    } else if ((( ret >= 200) && (ret <= 202)) && (strstr(content, "xend.err") != NULL)) {
         /* This is to catch case of 'virsh dump Domain-0 foo'
          * which returns a success code, but the word 'Cannot'
          * in body to indicate error
===================================================================

----- Original Message ----- 
From: "Daniel P. Berrange" <berrange at redhat.com>
To: "Kazuki?$B!!Mizushima" <mizushima.kazuk at jp.fujitsu.com>
Cc: <libvir-list at redhat.com>
Sent: Wednesday, February 28, 2007 12:50 AM
Subject: Re: [Libvir] [PATCH]Report the error from xend for Domain-0


> On Tue, Feb 27, 2007 at 01:47:29PM +0000, Daniel P. Berrange wrote:
>> On Tue, Feb 27, 2007 at 07:34:01PM +0900, Kazuki?$B!!Mizushima wrote:
>> > When I test virsh subcommands, dump save, for Domain-0,
>> > It says following normal messages, but the processing is not done.
>> > 
>> > -    } else if ((ret = 202) && (strstr(content, "failed") != NULL)) {
>> > +    } else if ((ret == 202) && (strstr(content, "failed") != NULL)) {
>> 
>> Yikes - that's a good catch - compiler wasn't even complaining because it
>> was surrounded in brackets. I'll apply this fix shortly.
> 
> I made one small change to your patch when committing it. It had been using
> 'strcasestr(content, "cannot"), but the strcasestr function is a GNU-ism
> so I replaced it with 'strstr(content, "Cannot")'.
> 
> Regards,
> Dan. 
> -- 
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