[PATCH 4/5] t1092: 'git add --refresh' difference with sparse-index

["Derrick Stolee via GitGitGadget" <gitgitgadget@gmail.com>]

From: Derrick Stolee <dstolee@microsoft.com>

When running 'git add --refresh <path>', Git does not actually stage the
change, but instead updates the index based on the stat() information in
the working directory.

This typically does not make sense in a sparse-checkout scenario, where
Git wants this file to not exist. However, sometimes the file can exist
on-disk for other reasons, such as a user manually adding the file or a
merge conflict outside of the sparse cone.

Since b243012 (refresh_index(): add flag to ignore SKIP_WORKTREE
entries, 2021-04-08), 'git add --refresh <path>' will output an advice
message to indicate that this is not allowed when <path> is outside the
sparse cone. The check goes around the sparse index protections at the
moment, so it does not find a match when contained in a sparse directory
entry. We will update this behavior with a later change, but want to
demonstrate the failure now.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
---
 t/t1092-sparse-checkout-compatibility.sh | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/t/t1092-sparse-checkout-compatibility.sh b/t/t1092-sparse-checkout-compatibility.sh
index f9e2f5f4aa1..73c48a71d89 100755
--- a/t/t1092-sparse-checkout-compatibility.sh
+++ b/t/t1092-sparse-checkout-compatibility.sh
@@ -347,6 +347,25 @@ test_expect_success 'status/add: outside sparse cone' '
 	test_all_match git commit -m folder1/newer
 '
 
+test_expect_failure 'add: pathspec within sparse directory' '
+	init_repos &&
+
+	run_on_sparse mkdir folder1 &&
+	run_on_sparse ../edit-contents folder1/a &&
+	run_on_all ../edit-contents folder1/new &&
+
+	# This "git add folder1/a" fails with a warning
+	# in the sparse repos, differing from the full
+	# repo. This is intentional.
+	#
+	# However, in the sparse-index, folder1/a does not
+	# match any cache entry and fails with a different
+	# error message. This needs work.
+	test_sparse_match test_must_fail git add folder1/a &&
+	test_sparse_match test_must_fail git add --refresh folder1/a &&
+	test_all_match git status --porcelain=v2
+'
+
 test_expect_success 'checkout and reset --hard' '
 	init_repos &&
 
-- 
gitgitgadget