Solve repository deletion error on Windows (#2711)

- Added function to delete given folder recursively.
- Used the function for deleting the folder, while deleting repository.

fixes #2628

src/main/scala/gitbucket/core/service/RepositoryService.scala

@@ -237,10 +237,11 @@ trait RepositoryService {
     LockUtil.lock(s"${repository.userName}/${repository.repositoryName}") {
       deleteRepositoryOnModel(repository.userName, repository.repositoryName)
 
-      FileUtils.deleteDirectory(getRepositoryDir(repository.userName, repository.repositoryName))
-      FileUtils.deleteDirectory(getWikiRepositoryDir(repository.userName, repository.repositoryName))
-      FileUtils.deleteDirectory(getTemporaryDir(repository.userName, repository.repositoryName))
-      FileUtils.deleteDirectory(getRepositoryFilesDir(repository.userName, repository.repositoryName))
+      FileUtil.deleteRecursively(getRepositoryDir(repository.userName, repository.repositoryName))
+
+      FileUtil.deleteRecursively(getWikiRepositoryDir(repository.userName, repository.repositoryName))
+      FileUtil.deleteRecursively(getTemporaryDir(repository.userName, repository.repositoryName))
+      FileUtil.deleteRecursively(getRepositoryFilesDir(repository.userName, repository.repositoryName))
 
       // Call hooks
       PluginRegistry().getRepositoryHooks.foreach(_.deleted(repository.userName, repository.repositoryName))

src/main/scala/gitbucket/core/util/FileUtil.scala

@@ -92,4 +92,14 @@ object FileUtil {
     name
   }
 
+  /**
+   * Delete given folder recursively.
+   */
+  def deleteRecursively(f: File): Boolean = {
+    if (f.isDirectory) f.listFiles match {
+      case files: Array[File] => files.foreach(deleteRecursively)
+      case null               =>
+    }
+    f.delete()
+  }
 }