How to create reflogs information in an existing bare repository

As you might have known that by default, git doesn't enable reflog updates for new bare repositories. The problem is, I have a long history repository but it was created before I set the flag "logAllRefUpdates" on, and now I want that information for another application to work.

How can I achieve that with minimal changes made to the existing repository. A very simple solution is pushing a new 开发者_如何学Gocommit which I don't want to (!) :-)

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The reflog is a relatively simple file format. Here's an example:

] cat .git/logs/HEAD|sed 's/\t/<TAB>/'
0000000000000000000000000000000000000000 5cfe4256d98af22a570c78c5e3048391a90f5f98 Joe User <foo@example.com> 1306427954 -0400<TAB>clone: from git://git.kernel.org/pub/scm/git/git.git

You can manually construct appropriate reflogs by following the same format:

previous-ref-or-zero new-ref User Name <user@email> unix-timestamp timezone\tmessage

Just create one of these for each ref. You can probably do this directly with git for-each-ref with an appropriate format string (thanks, Chris!)