Clone Wiki working repository if it does not exist before reverting.

src/main/scala/service/WikiService.scala

@@ -99,7 +99,11 @@ trait WikiService {
   def revertWikiPage(owner: String, repository: String, from: String, to: String,
                      committer: model.Account, pageName: Option[String]): Boolean = {
     LockUtil.lock(s"${owner}/${repository}/wiki"){
-      using(Git.open(Directory.getWikiWorkDir(owner, repository))){ git =>
+      defining(Directory.getWikiWorkDir(owner, repository)){ workDir =>
+        // clone working copy
+        cloneOrPullWorkingCopy(workDir, owner, repository)
+
+        using(Git.open(workDir)){ git =>
           val reader = git.getRepository.newObjectReader
           val oldTreeIter = new CanonicalTreeParser
           oldTreeIter.reset(reader, git.getRepository.resolve(from + "^{tree}"))
@@ -137,6 +141,7 @@ trait WikiService {
         }
       }
     }
+  }
 
 
   /**