From a574ef70b33dbfbc54978110fa781b7f9e20db1f Mon Sep 17 00:00:00 2001
From: David Chen <davidchen9568@gmail.com>
Date: Fri, 17 Feb 2017 21:46:33 +0800
Subject: [PATCH] Fix a bug in updater causing update zip file to fail to
 extract because the target directory contains file with the same name.

---
 src/QSP/Updates/Updater.cs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/QSP/Updates/Updater.cs b/src/QSP/Updates/Updater.cs
index e48f3a89..66dd879c 100644
--- a/src/QSP/Updates/Updater.cs
+++ b/src/QSP/Updates/Updater.cs
@@ -5,6 +5,7 @@
 using System.Linq;
 using System.Net;
 using System.Xml.Linq;
+using QSP.LibraryExtension;
 using QSP.LibraryExtension.XmlSerialization;
 using static QSP.Utilities.LoggerInstance;
 using static QSP.Utilities.ExceptionHelpers;
@@ -141,7 +142,11 @@ public static void Install(UpdateInfo info)
                 client.DownloadFile(info.Uri, zipFilePath);
             }
 
+            IOMethods.ClearDirectory(extractDir);
+
+            // This creates extractDir if necessary.
             ZipFile.ExtractToDirectory(zipFilePath, extractDir);
+
             IgnoreException(() => File.Delete(zipFilePath));
         }