[libvirt] [PATCH v2 04/15] virDomainLoaderDefParseXML: Allow loader path to be NULL

[Michal Privoznik]

Except not really. At least for now.

In the future, the firmware will be selected automagically.
Therefore, it makes no sense to require the pathname of a
specific firmware binary in the domain XML. But since it is not
implemented do not really allow the path to be NULL. Only move
code around to prepare it for further expansion.

Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
Reviewed-by: Laszlo Ersek <lersek at redhat.com>
---
 docs/schemas/domaincommon.rng |  4 +++-
 src/conf/domain_conf.c        | 29 +++++++++++++++++++++++++++--
 2 files changed, 30 insertions(+), 3 deletions(-)

diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index 80f9f84f70..c8d63c4912 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -283,7 +283,9 @@
                 </choice>
               </attribute>
             </optional>
-            <ref name="absFilePath"/>
+            <optional>
+              <ref name="absFilePath"/>
+            </optional>
           </element>
         </optional>
         <optional>
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index eb660f5764..053b2cb210 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -6590,6 +6590,22 @@ virDomainDefMemtuneValidate(const virDomainDef *def)
 }
 
 
+static int
+virDomainDefOSValidate(const virDomainDef *def)
+{
+    if (!def->os.loader)
+        return 0;
+
+    if (!def->os.loader->path) {
+        virReportError(VIR_ERR_XML_DETAIL, "%s",
+                       _("no loader path specified"));
+        return -1;
+    }
+
+    return 0;
+}
+
+
 static int
 virDomainDefValidateInternal(const virDomainDef *def)
 {
@@ -6628,6 +6644,9 @@ virDomainDefValidateInternal(const virDomainDef *def)
     if (virDomainDefMemtuneValidate(def) < 0)
         return -1;
 
+    if (virDomainDefOSValidate(def) < 0)
+        return -1;
+
     return 0;
 }
 
@@ -18246,6 +18265,9 @@ virDomainLoaderDefParseXML(xmlNodePtr node,
     type_str = virXMLPropString(node, "type");
     loader->path = (char *) xmlNodeGetContent(node);
 
+    if (STREQ_NULLABLE(loader->path, ""))
+        VIR_FREE(loader->path);
+
     if (readonly_str &&
         (loader->readonly = virTristateBoolTypeFromString(readonly_str)) <= 0) {
         virReportError(VIR_ERR_XML_DETAIL,
@@ -26989,9 +27011,12 @@ virDomainLoaderDefFormat(virBufferPtr buf,
     if (loader->secure)
         virBufferAsprintf(buf, " secure='%s'", secure);
 
-    virBufferAsprintf(buf, " type='%s'>", type);
+    virBufferAsprintf(buf, " type='%s'", type);
 
-    virBufferEscapeString(buf, "%s</loader>\n", loader->path);
+    if (loader->path)
+        virBufferEscapeString(buf, ">%s</loader>\n", loader->path);
+    else
+        virBufferAddLit(buf, "/>\n");
     if (loader->nvram || loader->templt) {
         virBufferAddLit(buf, "<nvram");
         virBufferEscapeString(buf, " template='%s'", loader->templt);
-- 
2.19.2