Linus Torvalds wrote:

quoted text
>> > So there is seldom any real need or reason to actually have multiple 
>> > checkouts. But it certainly _works_.
>> 
>> But without .git being either symlink, or .git/.gitdir "symref"-link,
>> you have to remember what to ser GIT_DIR to, or parameter for --git-dir
>> option.
> 
> I'd strongly suggest that people who do this should actually do
> 
>