Re: [PATCH] Proof-of-concept patch to remember what the detached HEAD was

Daniel Barkalow [off-list ref] writes:

When detaching HEAD (or "browsing history"), the user has specified
the commit with some "extended SHA1" which is not a local
branch....

I do not have enough mental bandwidth to think about (1) if this
information is a good thing to have, shown in your transcript, or (2) if
the name of the branch _before_ getting into the detached state may be
more interesting information tonight.

But I have one question regarding the implementation.  Why do you need a
new file in $GIT_DIR for this?  Wouldn't what is in the logs/HEAD be
enough, and if not why not?