schema: Restrict mode to octal

virStrToLong(..., 8, ...) already requires the mode to be octal.
Change the relax-ng schema to check for octal as well.
Signed-off-by: NPhilipp Hahn <hahn@univention.de>

docs/schemas/basictypes.rng

@@ -20,6 +20,12 @@
     </data>
   </define>
 
+  <define name='octalMode'>
+    <data type="unsignedInt">
+      <param name='pattern'>[0-7]+</param>
+    </data>
+  </define>
+
   <define name="uint8range">
     <choice>
       <data type="string">

docs/schemas/storagepool.rng

@@ -175,7 +175,7 @@
     <optional>
       <element name='permissions'>
         <element name='mode'>
-          <ref name='unsignedInt'/>
+          <ref name='octalMode'/>
         </element>
         <element name='owner'>
           <choice>

docs/schemas/storagevol.rng

@@ -46,7 +46,7 @@
     <optional>
       <element name='permissions'>
         <element name='mode'>
-          <ref name='unsignedInt'/>
+          <ref name='octalMode'/>
         </element>
         <element name='owner'>
           <ref name='unsignedInt'/>