Re: [PATCH 3/3] completion: Prevents GIT_PS1_DIRTYSTATE from breaking when CWD is .git

[Junio C Hamano <gitster@pobox.com>]

Ted Pavlic <ted@tedpavlic.com> writes:

> The GIT_PS1_DIRTYSTATE support uses a "git diff" to see if a "*" should
> be placed after the branch name. The "git diff" fails with an ugly error
> if the user has just changed directory into GIT_DIR.
>
> This patch uses "git rev-parse --is-inside-work-tree" to determine
> whether a "--work-tree=.." should be added to the "git diff".

Why ".."?  What prevents you from "cd .git/refs/heads"?

Your "is-inside-work-tree" might be a good change, but if you were to
spend a letter to notify the users, "Warning: You are inside GIT_DIR! This
is something unusual, proceed with caution." is a lot more important
notice to give them than "You seem to have unstaged changes" notice.

You have at least three possible states:

 * You are not in git repository at all;

 * You are somewhere in $GIT_DIR, perhaps in a bare repository, perhaps a
   repository with a work tree.

 * You are inside a work tree.

The first should be quiet, the second should say "Proceed with caution,
any 'rm -f file' or 'edit file' you do here should be to recover from
unusual repository corruptoin only; you are welcome to look but don't
touch.", and the last one is Ok to say "You have unstaged changes."