thodg/libgit2

diff --git a/tests-clar/checkout/conflict.c b/tests-clar/checkout/conflict.c
new file mode 100644
index 0000000..836495f
--- /dev/null
+++ b/tests-clar/checkout/conflict.c
@@ -0,0 +1,460 @@
+#include "clar_libgit2.h"
+#include "git2/repository.h"
+#include "git2/sys/index.h"
+#include "fileops.h"
+
+static git_repository *g_repo;
+static git_index *g_index;
+
+#define TEST_REPO_PATH "merge-resolve"
+
+#define CONFLICTING_ANCESTOR_OID   "d427e0b2e138501a3d15cc376077a3631e15bd46"
+#define CONFLICTING_OURS_OID       "4e886e602529caa9ab11d71f86634bd1b6e0de10"
+#define CONFLICTING_THEIRS_OID     "2bd0a343aeef7a2cf0d158478966a6e587ff3863"
+
+#define AUTOMERGEABLE_ANCESTOR_OID "6212c31dab5e482247d7977e4f0dd3601decf13b"
+#define AUTOMERGEABLE_OURS_OID     "ee3fa1b8c00aff7fe02065fdb50864bb0d932ccf"
+#define AUTOMERGEABLE_THEIRS_OID   "058541fc37114bfc1dddf6bd6bffc7fae5c2e6fe"
+
+#define LINK_ANCESTOR_OID          "1a010b1c0f081b2e8901d55307a15c29ff30af0e"
+#define LINK_OURS_OID              "72ea499e108df5ff0a4a913e7655bbeeb1fb69f2"
+#define LINK_THEIRS_OID            "8bfb012a6d809e499bd8d3e194a3929bc8995b93"
+
+#define LINK_ANCESTOR_TARGET       "file"
+#define LINK_OURS_TARGET           "other-file"
+#define LINK_THEIRS_TARGET         "still-another-file"
+
+#define CONFLICTING_OURS_FILE \
+	"this file is changed in master and branch\n"
+#define CONFLICTING_THEIRS_FILE \
+	"this file is changed in branch and master\n"
+#define CONFLICTING_DIFF3_FILE \
+	"<<<<<<< ours\n" \
+	"this file is changed in master and branch\n" \
+	"=======\n" \
+	"this file is changed in branch and master\n" \
+	">>>>>>> theirs\n"
+
+#define AUTOMERGEABLE_MERGED_FILE \
+	"this file is changed in master\n" \
+	"this file is automergeable\n" \
+	"this file is automergeable\n" \
+	"this file is automergeable\n" \
+	"this file is automergeable\n" \
+	"this file is automergeable\n" \
+	"this file is automergeable\n" \
+	"this file is automergeable\n" \
+	"this file is changed in branch\n"
+
+struct checkout_index_entry {
+	uint16_t mode;
+	char oid_str[41];
+	int stage;
+	char path[128];
+};
+
+void test_checkout_conflict__initialize(void)
+{
+	g_repo = cl_git_sandbox_init(TEST_REPO_PATH);
+	git_repository_index(&g_index, g_repo);
+
+	cl_git_rewritefile(
+		TEST_REPO_PATH "/.gitattributes",
+		"* text eol=lf\n");
+}
+
+void test_checkout_conflict__cleanup(void)
+{
+	git_index_free(g_index);
+	cl_git_sandbox_cleanup();
+}
+
+static void create_index(struct checkout_index_entry *entries, size_t entries_len)
+{
+	git_buf path = GIT_BUF_INIT;
+	size_t i;
+
+	for (i = 0; i < entries_len; i++) {
+		git_buf_joinpath(&path, TEST_REPO_PATH, entries[i].path);
+		p_unlink(git_buf_cstr(&path));
+
+		git_index_remove_bypath(g_index, entries[i].path);
+	}
+
+	for (i = 0; i < entries_len; i++) {
+		git_index_entry entry;
+
+		memset(&entry, 0x0, sizeof(git_index_entry));
+
+		entry.mode = entries[i].mode;
+		entry.flags = entries[i].stage << GIT_IDXENTRY_STAGESHIFT;
+		git_oid_fromstr(&entry.oid, entries[i].oid_str);
+		entry.path = entries[i].path;
+
+		git_index_add(g_index, &entry);
+	}
+
+	git_buf_free(&path);
+}
+
+static void create_conflicting_index(void)
+{
+	struct checkout_index_entry checkout_index_entries[] = {
+		{ 0100644, CONFLICTING_ANCESTOR_OID, 1, "conflicting.txt" },
+		{ 0100644, CONFLICTING_OURS_OID, 2, "conflicting.txt" },
+		{ 0100644, CONFLICTING_THEIRS_OID, 3, "conflicting.txt" },
+	};
+
+	create_index(checkout_index_entries, 3);
+	git_index_write(g_index);
+}
+
+static void ensure_workdir_contents(const char *path, const char *contents)
+{
+	git_buf fullpath = GIT_BUF_INIT, data_buf = GIT_BUF_INIT;
+
+	cl_git_pass(
+		git_buf_joinpath(&fullpath, git_repository_workdir(g_repo), path));
+
+	cl_git_pass(git_futils_readbuffer(&data_buf, git_buf_cstr(&fullpath)));
+	cl_assert(strcmp(git_buf_cstr(&data_buf), contents) == 0);
+
+	git_buf_free(&fullpath);
+	git_buf_free(&data_buf);
+}
+
+static void ensure_workdir_oid(const char *path, const char *oid_str)
+{
+	git_oid expected, actual;
+
+	cl_git_pass(git_oid_fromstr(&expected, oid_str));
+	cl_git_pass(git_repository_hashfile(&actual, g_repo, path, GIT_OBJ_BLOB, NULL));
+	cl_assert(git_oid_cmp(&expected, &actual) == 0);
+}
+
+static void ensure_workdir_mode(const char *path, int mode)
+{
+#ifndef GIT_WIN32
+	git_buf fullpath = GIT_BUF_INIT;
+	struct stat st;
+
+	cl_git_pass(
+		git_buf_joinpath(&fullpath, git_repository_workdir(g_repo), path));
+
+	cl_git_pass(p_stat(git_buf_cstr(&fullpath), &st));
+	cl_assert_equal_i(mode, st.st_mode);
+
+	git_buf_free(&fullpath);
+#endif
+}
+
+static void ensure_workdir_link(const char *path, const char *target)
+{
+#ifdef GIT_WIN32
+	ensure_workdir_contents(path, target);
+#else
+	git_buf fullpath = GIT_BUF_INIT;
+	char actual[1024];
+	struct stat st;
+	int len;
+
+	cl_git_pass(
+		git_buf_joinpath(&fullpath, git_repository_workdir(g_repo), path));
+
+	cl_git_pass(p_lstat(git_buf_cstr(&fullpath), &st));
+	cl_assert(S_ISLNK(st.st_mode));
+
+	cl_assert((len = p_readlink(git_buf_cstr(&fullpath), actual, 1024)) > 0);
+	actual[len] = '\0';
+	cl_assert(strcmp(actual, target) == 0);
+
+	git_buf_free(&fullpath);
+#endif
+}
+
+void test_checkout_conflict__ignored(void)
+{
+	git_checkout_opts opts = GIT_CHECKOUT_OPTS_INIT;
+
+	opts.checkout_strategy |= GIT_CHECKOUT_SKIP_UNMERGED;
+
+	create_conflicting_index();
+
+	cl_git_pass(git_checkout_index(g_repo, g_index, &opts));
+
+	cl_assert(!git_path_exists(TEST_REPO_PATH "/conflicting.txt"));
+}
+
+void test_checkout_conflict__ours(void)
+{
+	git_checkout_opts opts = GIT_CHECKOUT_OPTS_INIT;
+
+	opts.checkout_strategy |= GIT_CHECKOUT_USE_OURS;
+
+	create_conflicting_index();
+
+	cl_git_pass(git_checkout_index(g_repo, g_index, &opts));
+
+	ensure_workdir_contents("conflicting.txt", CONFLICTING_OURS_FILE);
+}
+
+void test_checkout_conflict__theirs(void)
+{
+	git_checkout_opts opts = GIT_CHECKOUT_OPTS_INIT;
+
+	opts.checkout_strategy |= GIT_CHECKOUT_USE_THEIRS;
+
+	create_conflicting_index();
+
+	cl_git_pass(git_checkout_index(g_repo, g_index, &opts));
+
+	ensure_workdir_contents("conflicting.txt", CONFLICTING_THEIRS_FILE);
+
+}
+
+void test_checkout_conflict__diff3(void)
+{
+	git_checkout_opts opts = GIT_CHECKOUT_OPTS_INIT;
+
+	create_conflicting_index();
+
+	cl_git_pass(git_checkout_index(g_repo, g_index, &opts));
+
+	ensure_workdir_contents("conflicting.txt", CONFLICTING_DIFF3_FILE);
+}
+
+void test_checkout_conflict__automerge(void)
+{
+	git_checkout_opts opts = GIT_CHECKOUT_OPTS_INIT;
+
+	struct checkout_index_entry checkout_index_entries[] = {
+		{ 0100644, AUTOMERGEABLE_ANCESTOR_OID, 1, "automergeable.txt" },
+		{ 0100644, AUTOMERGEABLE_OURS_OID, 2, "automergeable.txt" },
+		{ 0100644, AUTOMERGEABLE_THEIRS_OID, 3, "automergeable.txt" },
+	};
+
+	create_index(checkout_index_entries, 3);
+	git_index_write(g_index);
+
+	cl_git_pass(git_checkout_index(g_repo, g_index, &opts));
+
+	ensure_workdir_contents("automergeable.txt", AUTOMERGEABLE_MERGED_FILE);
+}
+
+void test_checkout_conflict__directory_file(void)
+{
+	git_checkout_opts opts = GIT_CHECKOUT_OPTS_INIT;
+
+	struct checkout_index_entry checkout_index_entries[] = {
+		{ 0100644, CONFLICTING_ANCESTOR_OID, 1, "df-1" },
+		{ 0100644, CONFLICTING_OURS_OID, 2, "df-1" },
+		{ 0100644, CONFLICTING_THEIRS_OID, 0, "df-1/file" },
+
+		{ 0100644, CONFLICTING_ANCESTOR_OID, 1, "df-2" },
+		{ 0100644, CONFLICTING_THEIRS_OID, 3, "df-2" },
+		{ 0100644, CONFLICTING_OURS_OID, 0, "df-2/file" },
+
+		{ 0100644, CONFLICTING_THEIRS_OID, 3, "df-3" },
+		{ 0100644, CONFLICTING_ANCESTOR_OID, 1, "df-3/file" },
+		{ 0100644, CONFLICTING_OURS_OID, 2, "df-3/file" },
+
+		{ 0100644, CONFLICTING_OURS_OID, 2, "df-4" },
+		{ 0100644, CONFLICTING_ANCESTOR_OID, 1, "df-4/file" },
+		{ 0100644, CONFLICTING_THEIRS_OID, 3, "df-4/file" },
+	};
+
+	opts.checkout_strategy |= GIT_CHECKOUT_SAFE;
+
+	create_index(checkout_index_entries, 12);
+	git_index_write(g_index);
+
+	cl_git_pass(git_checkout_index(g_repo, g_index, &opts));
+
+	ensure_workdir_oid("df-1/file", CONFLICTING_THEIRS_OID);
+	ensure_workdir_oid("df-1~ours", CONFLICTING_OURS_OID);
+	ensure_workdir_oid("df-2/file", CONFLICTING_OURS_OID);
+	ensure_workdir_oid("df-2~theirs", CONFLICTING_THEIRS_OID);
+	ensure_workdir_oid("df-3/file", CONFLICTING_OURS_OID);
+	ensure_workdir_oid("df-3~theirs", CONFLICTING_THEIRS_OID);
+	ensure_workdir_oid("df-4~ours", CONFLICTING_OURS_OID);
+	ensure_workdir_oid("df-4/file", CONFLICTING_THEIRS_OID);
+}
+
+void test_checkout_conflict__directory_file_with_custom_labels(void)
+{
+	git_checkout_opts opts = GIT_CHECKOUT_OPTS_INIT;
+
+	struct checkout_index_entry checkout_index_entries[] = {
+		{ 0100644, CONFLICTING_ANCESTOR_OID, 1, "df-1" },
+		{ 0100644, CONFLICTING_OURS_OID, 2, "df-1" },
+		{ 0100644, CONFLICTING_THEIRS_OID, 0, "df-1/file" },
+
+		{ 0100644, CONFLICTING_ANCESTOR_OID, 1, "df-2" },
+		{ 0100644, CONFLICTING_THEIRS_OID, 3, "df-2" },
+		{ 0100644, CONFLICTING_OURS_OID, 0, "df-2/file" },
+
+		{ 0100644, CONFLICTING_THEIRS_OID, 3, "df-3" },
+		{ 0100644, CONFLICTING_ANCESTOR_OID, 1, "df-3/file" },
+		{ 0100644, CONFLICTING_OURS_OID, 2, "df-3/file" },
+
+		{ 0100644, CONFLICTING_OURS_OID, 2, "df-4" },
+		{ 0100644, CONFLICTING_ANCESTOR_OID, 1, "df-4/file" },
+		{ 0100644, CONFLICTING_THEIRS_OID, 3, "df-4/file" },
+	};
+
+	opts.checkout_strategy |= GIT_CHECKOUT_SAFE;
+	opts.our_label = "HEAD";
+	opts.their_label = "branch";
+
+	create_index(checkout_index_entries, 12);
+	git_index_write(g_index);
+
+	cl_git_pass(git_checkout_index(g_repo, g_index, &opts));
+
+	ensure_workdir_oid("df-1/file", CONFLICTING_THEIRS_OID);
+	ensure_workdir_oid("df-1~HEAD", CONFLICTING_OURS_OID);
+	ensure_workdir_oid("df-2/file", CONFLICTING_OURS_OID);
+	ensure_workdir_oid("df-2~branch", CONFLICTING_THEIRS_OID);
+	ensure_workdir_oid("df-3/file", CONFLICTING_OURS_OID);
+	ensure_workdir_oid("df-3~branch", CONFLICTING_THEIRS_OID);
+	ensure_workdir_oid("df-4~HEAD", CONFLICTING_OURS_OID);
+	ensure_workdir_oid("df-4/file", CONFLICTING_THEIRS_OID);
+}
+
+void test_checkout_conflict__link_file(void)
+{
+	git_checkout_opts opts = GIT_CHECKOUT_OPTS_INIT;
+
+	struct checkout_index_entry checkout_index_entries[] = {
+		{ 0100644, CONFLICTING_ANCESTOR_OID, 1, "link-1" },
+		{ 0100644, CONFLICTING_OURS_OID, 2, "link-1" },
+		{ 0120000, LINK_THEIRS_OID, 3, "link-1" },
+
+		{ 0100644, CONFLICTING_ANCESTOR_OID, 1, "link-2" },
+		{ 0120000, LINK_OURS_OID, 2, "link-2" },
+		{ 0100644, CONFLICTING_THEIRS_OID, 3, "link-2" },
+
+		{ 0120000, LINK_ANCESTOR_OID, 1, "link-3" },
+		{ 0100644, CONFLICTING_OURS_OID, 2, "link-3" },
+		{ 0120000, LINK_THEIRS_OID, 3, "link-3" },
+
+		{ 0120000, LINK_ANCESTOR_OID, 1, "link-4" },
+		{ 0120000, LINK_OURS_OID, 2, "link-4" },
+		{ 0100644, CONFLICTING_THEIRS_OID, 3, "link-4" },
+	};
+
+	opts.checkout_strategy |= GIT_CHECKOUT_SAFE;
+
+	create_index(checkout_index_entries, 12);
+	git_index_write(g_index);
+
+	cl_git_pass(git_checkout_index(g_repo, g_index, &opts));
+
+	/* Typechange conflicts always keep the file in the workdir */
+	ensure_workdir_oid("link-1", CONFLICTING_OURS_OID);
+	ensure_workdir_oid("link-2", CONFLICTING_THEIRS_OID);
+	ensure_workdir_oid("link-3", CONFLICTING_OURS_OID);
+	ensure_workdir_oid("link-4", CONFLICTING_THEIRS_OID);
+}
+
+void test_checkout_conflict__links(void)
+{
+	git_checkout_opts opts = GIT_CHECKOUT_OPTS_INIT;
+
+	struct checkout_index_entry checkout_index_entries[] = {
+		{ 0120000, LINK_ANCESTOR_OID, 1, "link-1" },
+		{ 0120000, LINK_OURS_OID, 2, "link-1" },
+		{ 0120000, LINK_THEIRS_OID, 3, "link-1" },
+
+		{ 0120000, LINK_OURS_OID, 2, "link-2" },
+		{ 0120000, LINK_THEIRS_OID, 3, "link-2" },
+	};
+
+	opts.checkout_strategy |= GIT_CHECKOUT_SAFE;
+
+	create_index(checkout_index_entries, 5);
+	git_index_write(g_index);
+
+	cl_git_pass(git_checkout_index(g_repo, g_index, &opts));
+
+	/* Conflicts with links always keep the ours side (even with -Xtheirs) */
+	ensure_workdir_link("link-1", LINK_OURS_TARGET);
+	ensure_workdir_link("link-2", LINK_OURS_TARGET);
+}
+
+void test_checkout_conflict__add_add(void)
+{
+	git_checkout_opts opts = GIT_CHECKOUT_OPTS_INIT;
+
+	struct checkout_index_entry checkout_index_entries[] = {
+		{ 0100644, CONFLICTING_OURS_OID, 2, "conflicting.txt" },
+		{ 0100644, CONFLICTING_THEIRS_OID, 3, "conflicting.txt" },
+	};
+
+	opts.checkout_strategy |= GIT_CHECKOUT_SAFE;
+
+	create_index(checkout_index_entries, 2);
+	git_index_write(g_index);
+
+	cl_git_pass(git_checkout_index(g_repo, g_index, &opts));
+
+	/* Add/add writes diff3 files */
+	ensure_workdir_contents("conflicting.txt", CONFLICTING_DIFF3_FILE);
+}
+
+void test_checkout_conflict__mode_change(void)
+{
+	git_checkout_opts opts = GIT_CHECKOUT_OPTS_INIT;
+
+	struct checkout_index_entry checkout_index_entries[] = {
+		{ 0100644, CONFLICTING_ANCESTOR_OID, 1, "executable-1" },
+		{ 0100755, CONFLICTING_ANCESTOR_OID, 2, "executable-1" },
+		{ 0100644, CONFLICTING_THEIRS_OID, 3, "executable-1" },
+
+		{ 0100644, CONFLICTING_ANCESTOR_OID, 1, "executable-2" },
+		{ 0100644, CONFLICTING_OURS_OID, 2, "executable-2" },
+		{ 0100755, CONFLICTING_ANCESTOR_OID, 3, "executable-2" },
+
+		{ 0100755, CONFLICTING_ANCESTOR_OID, 1, "executable-3" },
+		{ 0100644, CONFLICTING_ANCESTOR_OID, 2, "executable-3" },
+		{ 0100755, CONFLICTING_THEIRS_OID, 3, "executable-3" },
+
+		{ 0100755, CONFLICTING_ANCESTOR_OID, 1, "executable-4" },
+		{ 0100755, CONFLICTING_OURS_OID, 2, "executable-4" },
+		{ 0100644, CONFLICTING_ANCESTOR_OID, 3, "executable-4" },
+
+		{ 0100644, CONFLICTING_ANCESTOR_OID, 1, "executable-5" },
+		{ 0100755, CONFLICTING_OURS_OID, 2, "executable-5" },
+		{ 0100644, CONFLICTING_THEIRS_OID, 3, "executable-5" },
+
+		{ 0100755, CONFLICTING_ANCESTOR_OID, 1, "executable-6" },
+		{ 0100644, CONFLICTING_OURS_OID, 2, "executable-6" },
+		{ 0100755, CONFLICTING_THEIRS_OID, 3, "executable-6" },
+	};
+
+	opts.checkout_strategy |= GIT_CHECKOUT_SAFE;
+
+	create_index(checkout_index_entries, 18);
+	git_index_write(g_index);
+
+	cl_git_pass(git_checkout_index(g_repo, g_index, &opts));
+
+	/* Keep the modified mode */
+	ensure_workdir_oid("executable-1", CONFLICTING_THEIRS_OID);
+	ensure_workdir_mode("executable-1", 0100755);
+
+	ensure_workdir_oid("executable-2", CONFLICTING_OURS_OID);
+	ensure_workdir_mode("executable-2", 0100755);
+
+	ensure_workdir_oid("executable-3", CONFLICTING_THEIRS_OID);
+	ensure_workdir_mode("executable-3", 0100644);
+
+	ensure_workdir_oid("executable-4", CONFLICTING_OURS_OID);
+	ensure_workdir_mode("executable-4", 0100644);
+
+	ensure_workdir_contents("executable-5", CONFLICTING_DIFF3_FILE);
+	ensure_workdir_mode("executable-5", 0100755);
+
+	ensure_workdir_contents("executable-6", CONFLICTING_DIFF3_FILE);
+	ensure_workdir_mode("executable-6", 0100644);
+}
diff --git a/tests-clar/resources/merge-resolve/.gitted/objects/1a/010b1c0f081b2e8901d55307a15c29ff30af0e b/tests-clar/resources/merge-resolve/.gitted/objects/1a/010b1c0f081b2e8901d55307a15c29ff30af0e
new file mode 100644
index 0000000..6039df0
Binary files /dev/null and b/tests-clar/resources/merge-resolve/.gitted/objects/1a/010b1c0f081b2e8901d55307a15c29ff30af0e differ
diff --git a/tests-clar/resources/merge-resolve/.gitted/objects/72/ea499e108df5ff0a4a913e7655bbeeb1fb69f2 b/tests-clar/resources/merge-resolve/.gitted/objects/72/ea499e108df5ff0a4a913e7655bbeeb1fb69f2
new file mode 100644
index 0000000..4886e49
Binary files /dev/null and b/tests-clar/resources/merge-resolve/.gitted/objects/72/ea499e108df5ff0a4a913e7655bbeeb1fb69f2 differ
diff --git a/tests-clar/resources/merge-resolve/.gitted/objects/8b/fb012a6d809e499bd8d3e194a3929bc8995b93 b/tests-clar/resources/merge-resolve/.gitted/objects/8b/fb012a6d809e499bd8d3e194a3929bc8995b93
new file mode 100644
index 0000000..a90ee08
Binary files /dev/null and b/tests-clar/resources/merge-resolve/.gitted/objects/8b/fb012a6d809e499bd8d3e194a3929bc8995b93 differ