File 53d124e7-fix-list_domain_details-check-config-data-length-0.patch of Package xen.481

From ef8cf0d4902c90595a0b0766e2a9a6ecbcbc4581 Mon Sep 17 00:00:00 2001
From: Chunyan Liu <cyliu@suse.com>
Date: Wed, 23 Jul 2014 17:42:09 +0800
Subject: [PATCH] fix list_domain_details: check config data length=0

If domain is created through virsh, then in xl, one could see it
with 'xl list', but with 'xl list --long domU', it reports:
"Domain name must be specified."
The reason is xl config data does not exist but it still tries
to parse_config_data in current code.

Improve list_domain_details:
If len of config data is 0, just pass, do not go forward to
parse_config_data, otherwise, it will meet error like
"Domain name not specified" and exit. This error is not expected,
since if code enters list_domain_details, domain name validness
is already checked and domain does exist.

Length of config data is 0 may means: config data does not exist due
to some reason, like: domain is created by libvirt, or in destroying
domain process config data is cleared but domain fails to clean up.
No matter in which case, list_domain_details could just show empty
info, but not error like "Domain name not specified".

Signed-off-by: Chunyan Liu <cyliu@suse.com>
Acked-by: Ian Jackson <ian.jackson@eu.citrix.com>
---
 tools/libxl/xl_cmdimpl.c | 2 ++
 1 file changed, 2 insertions(+)

Index: xen-4.4.0-testing/tools/libxl/xl_cmdimpl.c
===================================================================
--- xen-4.4.0-testing.orig/tools/libxl/xl_cmdimpl.c
+++ xen-4.4.0-testing/tools/libxl/xl_cmdimpl.c
@@ -3198,6 +3198,8 @@ static void list_domains_details(const l
         rc = libxl_userdata_retrieve(ctx, info[i].domid, "xl", &data, &len);
         if (rc)
             continue;
+        if (len == 0)
+            continue;
         CHK_SYSCALL(asprintf(&config_source, "<domid %d data>", info[i].domid));
         libxl_domain_config_init(&d_config);
         parse_config_data(config_source, (char *)data, len, &d_config, NULL);