Subject: Re: [RFC PATCH v2] prefix_path: show gitdir when arg is outside repo

From: Emily Shaffer <[email-masked]>
Date: Mon, 2 Mar 2020 18:19:24 -0800

On Fri, Feb 28, 2020 at 11:58:05AM -0800, Jonathan Nieder wrote:
> Hi,
> 
> Emily Shaffer wrote:
> 
> > When developing a script, it can be painful to understand why Git thinks
> > something is outside the current repo, if the current repo isn't what
> > the user thinks it is. Since this can be tricky to diagnose, especially
> > in cases like submodules or nested worktrees, let's give the user a hint
> > about which repository is offended about that path.
> >
> > Signed-off-by: Emily Shaffer <[email-masked]>
> > ---
> >  pathspec.c | 3 ++-
> >  setup.c    | 3 ++-
> >  2 files changed, 4 insertions(+), 2 deletions(-)
> > 
> > diff --git a/pathspec.c b/pathspec.c
> > index 128f27fcb7..166d255642 100644
> > --- a/pathspec.c
> > +++ b/pathspec.c
> > @@ -439,7 +439,8 @@ static void init_pathspec_item(struct pathspec_item *item, unsigned flags,
> >  		match = prefix_path_gently(prefix, prefixlen,
> >  					   &prefixlen, copyfrom);
> >  		if (!match)
> > -			die(_("%s: '%s' is outside repository"), elt, copyfrom);
> > +			die(_("%s: '%s' is outside repository at '%s'"), elt,
> > +			    copyfrom, absolute_path(get_git_work_tree()));
> 
> This is producing segfaults when run by magit.  Reproduction recipe:
> 
> 	cd .git
> 	git ls-files ..
> 
> Expected result:
> 
> 	fatal: ..: '..' is outside repository
> 
> Actual result:
> 
> 	Segmentation fault
> 
> Does this need an extra case to handle when there is no work tree?

Ah, I see it. You're right.

In that case I'll fall back on the git dir.

Will hopefully have a patch along today. Thanks for reporting it.

 - Emily