OO-1478: create the versions folder during import, double check if the 3 directories exists

src/main/java/org/olat/modules/wiki/Wiki.java

@@ -49,6 +49,7 @@ import org.olat.core.util.Formatter;
 import org.olat.core.util.vfs.VFSContainer;
 import org.olat.core.util.vfs.VFSItem;
 import org.olat.core.util.vfs.VFSLeaf;
+import org.olat.core.util.vfs.VFSManager;
 import org.olat.core.util.vfs.filters.VFSLeafFilter;
 import org.olat.modules.wiki.gui.components.wikiToHtml.FilterUtil;
 import org.olat.modules.wiki.versioning.ChangeInfo;
@@ -82,9 +83,9 @@ public class Wiki implements WikiContainer, Serializable {
 		if(wikiRootContainer == null) throw new AssertException("null values are not allowed for the wiki constructor!");
 		wikiPages = Collections.synchronizedMap(new HashMap<String, WikiPage>());
 		this.diffService = WikiManager.getInstance().getDiffService();
-		versionsContainer = (VFSContainer) wikiRootContainer.resolve(WikiManager.VERSION_FOLDER_NAME);
-		pageContainer = (VFSContainer) wikiRootContainer.resolve(WikiManager.WIKI_RESOURCE_FOLDER_NAME);
-		mediaContainer = (VFSContainer) wikiRootContainer.resolve(WikiContainer.MEDIA_FOLDER_NAME);
+		versionsContainer = VFSManager.getOrCreateContainer(wikiRootContainer, WikiManager.VERSION_FOLDER_NAME);
+		pageContainer = VFSManager.getOrCreateContainer(wikiRootContainer, WikiManager.WIKI_RESOURCE_FOLDER_NAME);
+		mediaContainer = VFSManager.getOrCreateContainer(wikiRootContainer, WikiContainer.MEDIA_FOLDER_NAME);
 	}
 
 	/**

src/main/java/org/olat/modules/wiki/WikiManager.java

@@ -208,6 +208,8 @@ public class WikiManager {
 			Files.createDirectories(wikiDir);
 			mediaDir = destDir.resolve(WikiContainer.MEDIA_FOLDER_NAME);
 			Files.createDirectories(mediaDir);
+			Path versionDir = destDir.resolve(VERSION_FOLDER_NAME);
+			Files.createDirectories(versionDir);
 		}
 		
 		@Override