From mboxrd@z Thu Jan  1 00:00:00 1970
From: =?Big5?B?pEG7xL5Z?= <ch3cooli@gmail.com>
Subject: git push --force to update tag
Date: Mon, 7 Jan 2013 10:23:52 +0800
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about git 1.8.2

 * "git push" now requires "-f" to update a tag, even if it is a
   fast-forward, as tags are meant to be fixed points.

Does the server side validate this? Do we need to upgrade git on
server side to support this?