[PATCH v2 09/14] add: update --chmod to skip sparse paths

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

From: Derrick Stolee <dstolee@microsoft.com>

We added checks for path_in_sparse_checkout() to portions of 'git add'
that add warnings and prevent staging a modification, but we skipped the
--chmod mode. Update chmod_pathspec() to ignore cache entries whose path
is outside of the sparse-checkout cone (unless --sparse is provided).
Add a test in t3705.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
---
 builtin/add.c                  |  4 +++-
 t/t3705-add-sparse-checkout.sh | 12 ++++++++++--
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/builtin/add.c b/builtin/add.c
index f8e3930608d..f87b8134b67 100644
--- a/builtin/add.c
+++ b/builtin/add.c
@@ -47,7 +47,9 @@ static int chmod_pathspec(struct pathspec *pathspec, char flip, int show_only)
 		struct cache_entry *ce = active_cache[i];
 		int err;
 
-		if (!include_sparse && ce_skip_worktree(ce))
+		if (!include_sparse &&
+		    (ce_skip_worktree(ce) ||
+		     !path_in_sparse_checkout(ce->name, &the_index)))
 			continue;
 
 		if (pathspec && !ce_path_match(&the_index, ce, pathspec, NULL))
diff --git a/t/t3705-add-sparse-checkout.sh b/t/t3705-add-sparse-checkout.sh
index 0f7e03b5326..6fc49a1845f 100755
--- a/t/t3705-add-sparse-checkout.sh
+++ b/t/t3705-add-sparse-checkout.sh
@@ -39,7 +39,7 @@ setup_gitignore () {
 
 test_sparse_entry_unstaged () {
 	git status --porcelain >actual &&
-	! grep "^M  sparse_entry\$" actual
+	! grep "^M[ M] sparse_entry\$" actual
 }
 
 test_expect_success 'setup' "
@@ -169,11 +169,19 @@ test_expect_success 'git add fails outside of sparse-checkout definition' '
 	test_must_fail git add sparse_entry &&
 	test_sparse_entry_unstaged &&
 
+	test_must_fail git add --chmod=+x sparse_entry &&
+	test_sparse_entry_unstaged &&
+
 	# Avoid munging CRLFs to avoid an error message
 	git -c core.autocrlf=input add --sparse sparse_entry 2>stderr &&
 	test_must_be_empty stderr &&
 	test-tool read-cache --table >actual &&
-	grep "^100644 blob.*sparse_entry\$" actual
+	grep "^100644 blob.*sparse_entry\$" actual &&
+
+	git add --sparse --chmod=+x sparse_entry 2>stderr &&
+	test_must_be_empty stderr &&
+	test-tool read-cache --table >actual &&
+	grep "^100755 blob.*sparse_entry\$" actual
 '
 
 test_expect_success 'add obeys advice.updateSparsePath' '
-- 
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