Re: [PATCH 1/1] builtin/show-ref: treat directory directory as non-existing in --exists

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

Patrick Steinhardt <ps@pks.im> writes:

> With that in mind I think it is okay to already mention the new backend
> in commit messages -- at least I have been doing that, as well. Also,
> the tree already knows about the reftable backend because we have both
> the library and technical documentation in it for quite some time
> already.
>
> The patch itself looks good to me, thanks! Whether we want to reroll
> just to amend the commit message I'll leave to you and others to decide.

Yup.  The patch looks good.  Here is what I tentatively queued.

----- >8 -----
From: Toon Claes <toon@iotcl.com>
Date: Wed, 10 Jan 2024 15:15:59 +0100
Subject: [PATCH] builtin/show-ref: treat directory directory as non-existing
 in --exists

9080a7f178 (builtin/show-ref: add new mode to check for reference
existence, 2023-10-31) added the option --exists to git-show-ref(1).

When you use this option against a ref that doesn't exist, but it is
a parent directory of an existing ref, you get the following error:

    $ git show-ref --exists refs/heads
    error: failed to look up reference: Is a directory

when the ref-files backend is in use.  To be more clear to user,
hide the error about having found a directory.  What matters to the
user is that the named ref does not exist.  Instead, print the same
error as when the ref was not found:

    error: reference does not exist

Signed-off-by: Toon Claes <toon@iotcl.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 builtin/show-ref.c  | 2 +-
 t/t1403-show-ref.sh | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/builtin/show-ref.c b/builtin/show-ref.c
index 7aac525a87..6025ce223d 100644
--- a/builtin/show-ref.c
+++ b/builtin/show-ref.c
@@ -239,7 +239,7 @@ static int cmd_show_ref__exists(const char **refs)
 	if (refs_read_raw_ref(get_main_ref_store(the_repository), ref,
 			      &unused_oid, &unused_referent, &unused_type,
 			      &failure_errno)) {
-		if (failure_errno == ENOENT) {
+		if (failure_errno == ENOENT || failure_errno == EISDIR) {
 			error(_("reference does not exist"));
 			ret = 2;
 		} else {
diff --git a/t/t1403-show-ref.sh b/t/t1403-show-ref.sh
index b50ae6fcf1..a8055f7fe1 100755
--- a/t/t1403-show-ref.sh
+++ b/t/t1403-show-ref.sh
@@ -260,9 +260,9 @@ test_expect_success '--exists with non-commit object' '
 
 test_expect_success '--exists with directory fails with generic error' '
 	cat >expect <<-EOF &&
-	error: failed to look up reference: Is a directory
+	error: reference does not exist
 	EOF
-	test_expect_code 1 git show-ref --exists refs/heads 2>err &&
+	test_expect_code 2 git show-ref --exists refs/heads 2>err &&
 	test_cmp expect err
 '
 
-- 
2.43.0-367-g186b115d30