Re: [PATCH] grep: die gracefully when outside repository

[Kristoffer Haugsbakk <code@khaugsbakk.name>]

On Tue, Oct 17, 2023, at 18:42, Junio C Hamano wrote:
> It is curious that the original has two sources of hint_path (i.e.,
> get_git_dir() is used as a fallback for get_git_work_tree()).  Are
> we certain that the check is at the right place?  If we do not have
> a repository, then both would fail by returning NULL, so it should
> not matter if we add the new check before we check either or both,
> or even after we checked both before dying.
>
> I wonder if
>
> 	const char *hint_path = get_git_work_tree();
>
> 	if (!hint_path)
> 	        hint_path = get_git_dir();
> 	if (hint_path)
> 		die(_("%s: '%s' is outside repository at '%s'"),
> 		    elt, copyfrom, absolute_path(hint_path));
> 	else
> 		die(_("%s: '%s' is outside the directory tree"),
> 		    elt, copyfrom);
>
> makes the intent of the code clearer.

That doesn't work since `get_git_dir()` triggers `BUG` instead of
returning `NULL`.

The `hint_path` declaration has to be at the start because of style
rules. But we can initialize it after.

I can also have a second look at the test since I am using `grep` to
test the failure output and not the translation string variant.

-- >8 --
Subject: [PATCH] fixup! grep: die gracefully when outside repository

---
 pathspec.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pathspec.c b/pathspec.c
index e115832f17a..0c1061fad11 100644
--- a/pathspec.c
+++ b/pathspec.c
@@ -467,10 +467,11 @@ static void init_pathspec_item(struct pathspec_item *item, unsigned flags,
 		match = prefix_path_gently(prefix, prefixlen,
 					   &prefixlen, copyfrom);
 		if (!match) {
-			const char *hint_path = get_git_work_tree();
+			const char *hint_path;
 			if (!have_git_dir())
 				die(_("'%s' is outside the directory tree"),
 				    copyfrom);
+			hint_path = get_git_work_tree();
 			if (!hint_path)
 				hint_path = get_git_dir();
 			die(_("%s: '%s' is outside repository at '%s'"), elt,
-- 
2.42.0.2.g879ad04204