[v3 1/3] rng: Allow template inclusion in install scripts

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From: "Zeeshan Ali (Khattak)" <zeeshanak@xxxxxxxxx>

Sometimes we'll have a lot in common between rather long templates of
different OSs. To be able to share the templates, we need a way to
include templates from one XML file to another.

XInclude[1] is the way we achieve that.

http://www.w3.org/TR/xinclude/
---
 data/schemas/libosinfo.rng | 27 ++++++++++++++++++---------
 osinfo/osinfo_loader.c     |  9 +++++++++
 2 files changed, 27 insertions(+), 9 deletions(-)

diff --git a/data/schemas/libosinfo.rng b/data/schemas/libosinfo.rng
index 90b0dfb..5852652 100644
--- a/data/schemas/libosinfo.rng
+++ b/data/schemas/libosinfo.rng
@@ -579,15 +579,24 @@
             <ref name='bool'/>
           </element>
         </optional>
-        <element name='template'>
-          <choice>
-            <group>
-              <attribute name="uri"/>
-              <empty/>
-            </group>
-            <ref name="customElement"/>
-          </choice>
-        </element>
+        <choice>
+          <element name='template'>
+            <choice>
+              <group>
+                <attribute name="uri"/>
+                <empty/>
+              </group>
+              <ref name="customElement"/>
+            </choice>
+          </element>
+          <element name='xi:include' xmlns:xi="http://www.w3.org/2001/XInclude";>
+            <interleave>
+              <attribute name="href"/>
+              <attribute name="parse"/>
+              <attribute name="xpointer"/>
+            </interleave>
+          </element>
+        </choice>
         <ref name='product-attr'/>
         <ref name='product-rel'/>
       </interleave>
diff --git a/osinfo/osinfo_loader.c b/osinfo/osinfo_loader.c
index 76e9bc2..bfe118a 100644
--- a/osinfo/osinfo_loader.c
+++ b/osinfo/osinfo_loader.c
@@ -34,6 +34,7 @@
 #include <libxml/tree.h>
 #include <libxml/xpath.h>
 #include <libxml/xmlreader.h>
+#include <libxml/xinclude.h>
 #include "ignore-value.h"
 #include "osinfo_install_script_private.h"
 #include "osinfo_device_driver_private.h"
@@ -1391,6 +1392,14 @@ static void osinfo_loader_process_xml(OsinfoLoader *loader,
      */
     g_clear_error(err);
 
+    if (xmlXIncludeProcessFlags(xml,
+                                XML_PARSE_NOENT |
+                                XML_PARSE_NONET |
+                                XML_PARSE_NOWARNING) < 0) {
+        OSINFO_ERROR(err, _("Processing of 'xi:include' nodes failed"));
+        goto cleanup;
+    }
+
     root = xmlDocGetRootElement(xml);
 
     if (!root) {
-- 
1.8.1.2

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