"git clone" can't clone a gitweb URL

$ git clone http://repo.or.cz/w/i18n.git
error: Can't lock ref
rm: cannot remove directory `i18n/.git/clone-tmp': Directory not emp
ty

At last I found the URL was a gitweb URL not for mirroring.

It's better git provides clear information like "This is maybe a
gitweb URL, view it in web browser for more information", or
gitweb can send a redirection response to git client. Even more,
git-daemon also can send redirection response to tell git client
that the service is offline temporarily and it can use an alternative
server.
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