Re: [PATCH] setup: return correct prefix if worktree is '/'

[Michael J Gruber <git@drmicha.warpmail.net>]

Nguyễn Thái Ngọc Duy venit, vidit, dixit 25.03.2011 14:49:
> The same old problem reappears after setup code is reworked. We tend
> to assume there is at least one path component in a path and forget
> that path can be simply '/'.
> 
> Reported-by: Matthijs Kooijman <matthijs@stdin.nl>
> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
> ---
>  cache.h |    2 ++
>  path.c  |   35 +++++++++++++++++++++++++++++++++++
>  setup.c |    5 ++---
>  3 files changed, 39 insertions(+), 3 deletions(-)
> 

Wait wait, the bug bisects to

490544b (get_cwd_relative(): do not misinterpret suffix as subdirectory,
2010-05-22)

for me, using

git bisect run sh -c "make || exit 125; cd /etc; GIT_DIR=/tmp/a/.git
~/src/git/git-add fstab || exit 1"

and a repo in /tmp/a/.git with core.worktree set to "/".

The issue is that in get_relative_cwd() of dir.c, "dir" (and maybe
("cwd") may or may not end in "/", so even with dir="/etc/" and
cwd="/etc" we would not recognize we are within the repo. Patch for that
is coming.

Note that by doing something like the above, we can test / without being
root as long as we have files there which we can rely on being readable,
or can rely on /tmp being there.

Michael