sparse-index: integrate with cherry-pick and rebase

The hard work was already done with 'git merge' and the ORT strategy.
Just add extra tests to see that we get the expected results in the
non-conflict cases.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>

builtin/rebase.c

@@ -559,6 +559,9 @@ int cmd_rebase__interactive(int argc, const char **argv, const char *prefix)
 	argc = parse_options(argc, argv, prefix, options,
 			builtin_rebase_interactive_usage, PARSE_OPT_KEEP_ARGV0);
 
+	prepare_repo_settings(the_repository);
+	the_repository->settings.command_requires_full_index = 0;
+
 	if (!is_null_oid(&squash_onto))
 		opts.squash_onto = &squash_onto;
 
@@ -1430,6 +1433,9 @@ int cmd_rebase(int argc, const char **argv, const char *prefix)
 		usage_with_options(builtin_rebase_usage,
 				   builtin_rebase_options);
 
+	prepare_repo_settings(the_repository);
+	the_repository->settings.command_requires_full_index = 0;
+
 	options.allow_empty_message = 1;
 	git_config(rebase_config, &options);
 	/* options.gpg_sign_opt will be either "-S" or NULL */

builtin/revert.c

@@ -136,6 +136,9 @@ static int run_sequencer(int argc, const char **argv, struct replay_opts *opts)
 			PARSE_OPT_KEEP_ARGV0 |
 			PARSE_OPT_KEEP_UNKNOWN);
 
+	prepare_repo_settings(the_repository);
+	the_repository->settings.command_requires_full_index = 0;
+
 	/* implies allow_empty */
 	if (opts->keep_redundant_commits)
 		opts->allow_empty = 1;

t/t1092-sparse-checkout-compatibility.sh

@@ -532,6 +532,38 @@ test_expect_success 'merge with conflict outside cone' '
 	test_all_match git rev-parse HEAD^{tree}
 '
 
+test_expect_success 'cherry-pick/rebase with conflict outside cone' '
+	init_repos &&
+
+	for OPERATION in cherry-pick rebase
+	do
+		test_all_match git checkout -B tip &&
+		test_all_match git reset --hard merge-left &&
+		test_all_match git status --porcelain=v2 &&
+		test_all_match test_must_fail git $OPERATION merge-right &&
+		test_all_match git status --porcelain=v2 &&
+
+		# Resolve the conflict in different ways:
+		# 1. Revert to the base
+		test_all_match git checkout base -- deep/deeper2/a &&
+		test_all_match git status --porcelain=v2 &&
+
+		# 2. Add the file with conflict markers
+		test_all_match git add folder1/a &&
+		test_all_match git status --porcelain=v2 &&
+
+		# 3. Rename the file to another sparse filename and
+		#    accept conflict markers as resolved content.
+		run_on_all mv folder2/a folder2/z &&
+		test_all_match git add folder2 &&
+		test_all_match git status --porcelain=v2 &&
+
+		test_all_match git $OPERATION --continue &&
+		test_all_match git status --porcelain=v2 &&
+		test_all_match git rev-parse HEAD^{tree} || return 1
+	done
+'
+
 test_expect_success 'merge with outside renames' '
 	init_repos &&
 
@@ -682,11 +714,12 @@ test_expect_success 'sparse-index is not expanded' '
 	echo >>sparse-index/untracked.txt &&
 	ensure_not_expanded add . &&
 
-	ensure_not_expanded checkout -f update-deep &&
-	GIT_TEST_MERGE_ALGORITHM=ort \
-		ensure_not_expanded merge -m merge update-folder1 &&
-	GIT_TEST_MERGE_ALGORITHM=ort \
-		ensure_not_expanded merge -m merge update-folder2
+	for OPERATION in "merge -s ort -m merge" cherry-pick rebase
+	do
+		ensure_not_expanded checkout -f -B temp update-deep &&
+		ensure_not_expanded $OPERATION update-folder1 &&
+		ensure_not_expanded $OPERATION update-folder2 || return 1
+	done
 '
 
 # NEEDSWORK: a sparse-checkout behaves differently from a full checkout