snapshot: conf: Make virDomainSnapshotIsExternal more reusable

Allow to use definition objects with this predicate function.

src/conf/snapshot_conf.c

@@ -1058,17 +1058,23 @@ cleanup:
 
 
 bool
-virDomainSnapshotIsExternal(virDomainSnapshotObjPtr snap)
+virDomainSnapshotDefIsExternal(virDomainSnapshotDefPtr def)
 {
     int i;
 
-    if (snap->def->memory == VIR_DOMAIN_SNAPSHOT_LOCATION_EXTERNAL)
+    if (def->memory == VIR_DOMAIN_SNAPSHOT_LOCATION_EXTERNAL)
         return true;
 
-    for (i = 0; i < snap->def->ndisks; i++) {
-        if (snap->def->disks[i].snapshot == VIR_DOMAIN_SNAPSHOT_LOCATION_EXTERNAL)
+    for (i = 0; i < def->ndisks; i++) {
+        if (def->disks[i].snapshot == VIR_DOMAIN_SNAPSHOT_LOCATION_EXTERNAL)
             return true;
     }
 
     return false;
 }
+
+bool
+virDomainSnapshotIsExternal(virDomainSnapshotObjPtr snap)
+{
+    return virDomainSnapshotDefIsExternal(snap->def);
+}

src/conf/snapshot_conf.h

@@ -166,6 +166,7 @@ int virDomainListSnapshots(virDomainSnapshotObjListPtr snapshots,
                            virDomainSnapshotPtr **snaps,
                            unsigned int flags);
 
+bool virDomainSnapshotDefIsExternal(virDomainSnapshotDefPtr def);
 bool virDomainSnapshotIsExternal(virDomainSnapshotObjPtr snap);
 
 VIR_ENUM_DECL(virDomainSnapshotLocation)

src/libvirt_private.syms

@@ -1097,6 +1097,7 @@ virDomainSnapshotAlignDisks;
 virDomainSnapshotAssignDef;
 virDomainSnapshotDefFormat;
 virDomainSnapshotDefFree;
+virDomainSnapshotDefIsExternal;
 virDomainSnapshotDefParseString;
 virDomainSnapshotDropParent;
 virDomainSnapshotFindByName;