Hi Stolee,
is there a reason we don't do this in the test case that you added in
63b60b3add75 ("add: update --chmod to skip sparse paths", 2021-09-24).
Notice that the similar git add earlier also sets core.autocrlf. As the
comment indicates, stderr indeed contains a warning about LF->CRLF
conversion in my Windows build and fails test_must_be_empty.
diff --git a/t/t3705-add-sparse-checkout.sh b/t/t3705-add-sparse-checkout.sh
index 81f3384eee..4fb663e3b4 100755
--- a/t/t3705-add-sparse-checkout.sh
+++ b/t/t3705-add-sparse-checkout.sh
@@ -181,13 +181,13 @@ test_expect_success 'git add fails outside of sparse-checkout definition' '
# Avoid munging CRLFs to avoid an error message
git -c core.autocrlf=input add --sparse sparse_entry 2>stderr &&
test_must_be_empty stderr &&
git ls-files --stage >actual &&
grep "^100644 .*sparse_entry\$" actual &&
- git add --sparse --chmod=+x sparse_entry 2>stderr &&
+ git -c core.autocrlf=input add --sparse --chmod=+x sparse_entry 2>stderr &&
test_must_be_empty stderr &&
git ls-files --stage >actual &&
grep "^100755 .*sparse_entry\$" actual &&
git reset &&
