Restrict upgrades to explicit allowed version

version.php now contains the previous ownCloud version from which
upgrades are allowed. Any other upgrades will show a message that the
upgrade/downgrade is not supported.

1 files changed, 7 insertions, 4 deletions

diff --git a/version.php b/version.php
index a115f4b26be..a6b49d9dc74 100644
--- a/version.php
+++ b/version.php
@@ -2,6 +2,7 @@
 /**
  * @author Frank Karlitschek <frank@owncloud.org>
  * @author Lukas Reschke <lukas@owncloud.com>
+ * @author Vincent Petry <pvince81@owncloud.com>
  *
  * @copyright Copyright (c) 2015, ownCloud, Inc.
  * @license AGPL-3.0
@@ -22,14 +23,16 @@
 // We only can count up. The 4. digit is only for the internal patchlevel to trigger DB upgrades
 // between betas, final and RCs. This is _not_ the public version number. Reset minor/patchlevel
 // when updating major/minor version number.
-$OC_Version=array(8, 2, 0, 4);
+$OC_Version = [8, 2, 0, 4];
 
 // The human readable string
-$OC_VersionString='8.2 pre alpha';
+$OC_VersionString = '8.2 pre alpha';
+
+$OC_VersionCanBeUpgradedFrom = [8, 1];
 
 // The ownCloud channel
-$OC_Channel='git';
+$OC_Channel = 'git';
 
 // The build number
-$OC_Build='';
+$OC_Build = '';