[PATCH v4 1/2] qemu: formatting XML from domain def choosing the root name

["Maxiwell S. Garcia" <maxiwell@xxxxxxxxxxxxx>]

The function virDomainDefFormatInternal() has the predefined root name
"domain" to format the XML. But to save both active and inactive domain
in the snapshot XML, the new root name "inactiveDomain" was created.
So, the new function virDomainDefFormatInternalSetRootName() allows to
choose the root name of XML. The former function became a tiny wrapper
to call the new function setting the correct parameters.

Signed-off-by: Maxiwell S. Garcia <maxiwell@xxxxxxxxxxxxx>
---
 src/conf/domain_conf.c | 35 ++++++++++++++++++++++++++---------
 src/conf/domain_conf.h |  6 ++++++
 2 files changed, 32 insertions(+), 9 deletions(-)

diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index b7a342bb91..3154c07a86 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -21517,10 +21517,11 @@ virDomainDefParseNode(xmlDocPtr xml,
     virDomainDefPtr def = NULL;
     virDomainDefPtr ret = NULL;
 
-    if (!virXMLNodeNameEqual(root, "domain")) {
+    if ((!virXMLNodeNameEqual(root, "domain")) &&
+        (!virXMLNodeNameEqual(root, "inactiveDomain"))) {
         virReportError(VIR_ERR_XML_ERROR,
                        _("unexpected root element <%s>, "
-                         "expecting <domain>"),
+                         "expecting <domain> or <inactiveDomain>"),
                        root->name);
         goto cleanup;
     }
@@ -28277,17 +28278,29 @@ virDomainDefFormatFeatures(virBufferPtr buf,
     return virXMLFormatElement(buf, "features", NULL, &childBuf);
 }
 
-
-/* This internal version appends to an existing buffer
- * (possibly with auto-indent), rather than flattening
- * to string.
- * Return -1 on failure.  */
 int
 virDomainDefFormatInternal(virDomainDefPtr def,
                            virCapsPtr caps,
                            unsigned int flags,
                            virBufferPtr buf,
                            virDomainXMLOptionPtr xmlopt)
+{
+    return virDomainDefFormatInternalSetRootName(def, caps, flags, buf,
+                                                 xmlopt, "domain");
+}
+
+
+/* This internal version appends to an existing buffer
+ * (possibly with auto-indent), rather than flattening
+ * to string.
+ * Return -1 on failure.  */
+int
+virDomainDefFormatInternalSetRootName(virDomainDefPtr def,
+                                      virCapsPtr caps,
+                                      unsigned int flags,
+                                      virBufferPtr buf,
+                                      virDomainXMLOptionPtr xmlopt,
+                                      const char *rootname)
 {
     unsigned char *uuid;
     char uuidstr[VIR_UUID_STRING_BUFLEN];
@@ -28312,7 +28325,11 @@ virDomainDefFormatInternal(virDomainDefPtr def,
     if (def->id == -1)
         flags |= VIR_DOMAIN_DEF_FORMAT_INACTIVE;
 
-    virBufferAsprintf(buf, "<domain type='%s'", type);
+    if (!rootname || (STRNEQ(rootname, "domain") &&
+                      STRNEQ(rootname, "inactiveDomain")))
+        goto error;
+
+    virBufferAsprintf(buf, "<%s type='%s'", rootname, type);
     if (!(flags & VIR_DOMAIN_DEF_FORMAT_INACTIVE))
         virBufferAsprintf(buf, " id='%d'", def->id);
     if (def->namespaceData && def->ns.format)
@@ -28794,7 +28811,7 @@ virDomainDefFormatInternal(virDomainDefPtr def,
     virDomainSEVDefFormat(buf, def->sev);
 
     virBufferAdjustIndent(buf, -2);
-    virBufferAddLit(buf, "</domain>\n");
+    virBufferAsprintf(buf, "</%s>\n", rootname);
 
     if (virBufferCheckError(buf) < 0)
         goto error;
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 33cef5b75c..af1335cc16 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -3073,6 +3073,12 @@ int virDomainDefFormatInternal(virDomainDefPtr def,
                                unsigned int flags,
                                virBufferPtr buf,
                                virDomainXMLOptionPtr xmlopt);
+int virDomainDefFormatInternalSetRootName(virDomainDefPtr def,
+                                          virCapsPtr caps,
+                                          unsigned int flags,
+                                          virBufferPtr buf,
+                                          virDomainXMLOptionPtr xmlopt,
+                                          const char *rootname);
 
 int virDomainDiskSourceFormat(virBufferPtr buf,
                               virStorageSourcePtr src,
-- 
2.20.1

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