[PATCH] virsh: Strip XML declaration when extracting CPU XMLs

[Jiri Denemark <jdenemar@xxxxxxxxxx>]

Since commit v4.3.0-336-gc84726fbdd all
{hypervisor-,}cpu-{baseline,compare} commands use a generic
vshExtractCPUDefXMLs helper for extracting individual CPU definitions
from the provided input file. The helper wraps the input file in a
<container> element so that several independent elements can be easily
parsed from the file. This works fine except when the file starts with
XML declaration (<?xml version="1.0" ... ?>) because the XML declaration
cannot be put inside any element. In fact it has to be at the very
beginning of the XML document without any preceding white space
characters. We can just simply skip the XML declaration.

https://bugzilla.redhat.com/show_bug.cgi?id=1595993

Signed-off-by: Jiri Denemark <jdenemar@xxxxxxxxxx>
---
 tools/virsh-host.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/tools/virsh-host.c b/tools/virsh-host.c
index 16f504bafe..b7f86bdd91 100644
--- a/tools/virsh-host.c
+++ b/tools/virsh-host.c
@@ -1130,13 +1130,20 @@ vshExtractCPUDefXMLs(vshControl *ctl,
     xmlDocPtr xml = NULL;
     xmlXPathContextPtr ctxt = NULL;
     xmlNodePtr *nodes = NULL;
+    char *doc;
     size_t i;
     int n;
 
     if (virFileReadAll(xmlFile, VSH_MAX_XML_FILE, &buffer) < 0)
         goto error;
 
-    if (virAsprintf(&xmlStr, "<container>%s</container>", buffer) < 0)
+    /* Strip possible XML declaration */
+    if (STRPREFIX(buffer, "<?xml") && (doc = strstr(buffer, "?>")))
+        doc += 2;
+    else
+        doc = buffer;
+
+    if (virAsprintf(&xmlStr, "<container>%s</container>", doc) < 0)
         goto error;
 
     if (!(xml = virXMLParseStringCtxt(xmlStr, xmlFile, &ctxt)))
-- 
2.19.1

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