sparse-checkout: correct reapply's handling of options

Commit 4e256731d6 ("sparse-checkout: enable reapply to take
--[no-]{cone,sparse-index}", 2021-12-14) made it so that reapply could
take additional options but added no tests.  Tests would have shown that
the feature doesn't work because the initial values are set AFTER
parsing the command line options instead of before.  Add a test and set
the initial value at the appropriate time.

Reviewed-by: Derrick Stolee <derrickstolee@github.com>
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

2 files changed, 31 insertions, 3 deletions

diff --git a/builtin/sparse-checkout.c b/builtin/sparse-checkout.c
index a311483a7d..fcd574f5fc 100644
--- a/builtin/sparse-checkout.c
+++ b/builtin/sparse-checkout.c
@@ -789,15 +789,15 @@ static int sparse_checkout_reapply(int argc, const char **argv)
 	if (!core_apply_sparse_checkout)
 		die(_("must be in a sparse-checkout to reapply sparsity patterns"));
 
+	reapply_opts.cone_mode = -1;
+	reapply_opts.sparse_index = -1;
+
 	argc = parse_options(argc, argv, NULL,
 			     builtin_sparse_checkout_reapply_options,
 			     builtin_sparse_checkout_reapply_usage, 0);
 
 	repo_read_index(the_repository);
 
-	reapply_opts.cone_mode = -1;
-	reapply_opts.sparse_index = -1;
-
 	if (update_modes(&reapply_opts.cone_mode, &reapply_opts.sparse_index))
 		return 1;
 
diff --git a/t/t1091-sparse-checkout-builtin.sh b/t/t1091-sparse-checkout-builtin.sh
index 3592d12442..ce5e7c19ef 100755
--- a/t/t1091-sparse-checkout-builtin.sh
+++ b/t/t1091-sparse-checkout-builtin.sh
@@ -495,6 +495,34 @@ test_expect_failure 'sparse-checkout reapply' '
 	git -C tweak sparse-checkout disable
 '
 
+test_expect_success 'reapply can handle config options' '
+	git -C repo sparse-checkout init --cone --no-sparse-index &&
+	git -C repo config --worktree --list >actual &&
+	cat >expect <<-\EOF &&
+	core.sparsecheckout=true
+	core.sparsecheckoutcone=true
+	EOF
+	test_cmp expect actual &&
+
+	git -C repo sparse-checkout reapply --no-cone --no-sparse-index &&
+	git -C repo config --worktree --list >actual &&
+	cat >expect <<-\EOF &&
+	core.sparsecheckout=true
+	EOF
+	test_cmp expect actual &&
+
+	git -C repo sparse-checkout reapply --cone --sparse-index &&
+	git -C repo config --worktree --list >actual &&
+	cat >expect <<-\EOF &&
+	core.sparsecheckout=true
+	core.sparsecheckoutcone=true
+	index.sparse=true
+	EOF
+	test_cmp expect actual &&
+
+	git -C repo sparse-checkout disable
+'
+
 test_expect_success 'cone mode: set with core.ignoreCase=true' '
 	rm repo/.git/info/sparse-checkout &&
 	git -C repo sparse-checkout init --cone &&