From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Yin Ping" <pkufranky@gmail.com>
Subject: [BUG] git-mv submodule failure
Date: Sat, 20 Oct 2007 14:01:31 +0800
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project
  .git
  file1
  submoudle
     .git
      file2

$ cd project
$ git-mv submodule submodule1
fatal: source directory is empty, source=submodule, destination=submodule1

However, the following is ok and rename is automatically detected
$ cd project
$ mv submodule submodule1
$ git-add submodule1
$ git-commit -a

which gives in vim:
# Please enter the commit message for your changes.
# (Comment lines starting with '#' will not be included)
# On branch master
# Changes to be committed:
#   (use "git reset HEAD <file>..." to unstage)
#
#   renamed:    submodule -> submodule1
#

-- 
franky