1 files changed, 129 insertions, 0 deletions
diff --git a/tests/libgit2/index/nsec.c b/tests/libgit2/index/nsec.c
new file mode 100644
index 000000000..3efd855a7
--- /dev/null
+++ b/tests/libgit2/index/nsec.c
@@ -0,0 +1,129 @@
+#include "clar_libgit2.h"
+#include "index.h"
+#include "git2/sys/index.h"
+#include "git2/repository.h"
+#include "../reset/reset_helpers.h"
+
+static git_repository *repo;
+static git_index *repo_index;
+
+#define TEST_REPO_PATH "nsecs"
+
+/* Fixture setup and teardown */
+void test_index_nsec__initialize(void)
+{
+	repo = cl_git_sandbox_init("nsecs");
+	git_repository_index(&repo_index, repo);
+}
+
+void test_index_nsec__cleanup(void)
+{
+	git_index_free(repo_index);
+	repo_index = NULL;
+
+	cl_git_sandbox_cleanup();
+}
+
+static bool try_create_file_with_nsec_timestamp(const char *path)
+{
+	struct stat st;
+	int try;
+
+	/* retry a few times to avoid nanos *actually* equal 0 race condition */
+	for (try = 0; try < 3; try++) {
+		cl_git_mkfile(path, "This is hopefully a file with nanoseconds!");
+
+		cl_must_pass(p_stat(path, &st));
+
+		if (st.st_ctime_nsec && st.st_mtime_nsec)
+			return true;
+	}
+
+	return false;
+}
+
+/* try to determine if the underlying filesystem supports a resolution
+ * higher than a single second.  (i'm looking at you, hfs+)
+ */
+static bool should_expect_nsecs(void)
+{
+	git_str nsec_path = GIT_STR_INIT;
+	bool expect;
+
+	git_str_joinpath(&nsec_path, clar_sandbox_path(), "nsec_test");
+
+	expect = try_create_file_with_nsec_timestamp(nsec_path.ptr);
+
+	cl_must_pass(p_unlink(nsec_path.ptr));
+
+	git_str_dispose(&nsec_path);
+
+	return expect;
+}
+
+static bool has_nsecs(void)
+{
+	const git_index_entry *entry;
+	size_t i;
+	bool has_nsecs = false;
+
+	for (i = 0; i < git_index_entrycount(repo_index); i++) {
+		entry = git_index_get_byindex(repo_index, i);
+
+		if (entry->ctime.nanoseconds || entry->mtime.nanoseconds) {
+			has_nsecs = true;
+			break;
+		}
+	}
+
+	return has_nsecs;
+}
+
+void test_index_nsec__has_nanos(void)
+{
+	cl_assert_equal_b(true, has_nsecs());
+}
+
+void test_index_nsec__staging_maintains_other_nanos(void)
+{
+	const git_index_entry *entry;
+	bool expect_nsec, test_file_has_nsec;
+
+	expect_nsec = should_expect_nsecs();
+	test_file_has_nsec = try_create_file_with_nsec_timestamp("nsecs/a.txt");
+
+	cl_assert_equal_b(expect_nsec, test_file_has_nsec);
+
+	cl_git_pass(git_index_add_bypath(repo_index, "a.txt"));
+	cl_git_pass(git_index_write(repo_index));
+
+	cl_git_pass(git_index_write(repo_index));
+
+	git_index_read(repo_index, 1);
+	cl_assert_equal_b(true, has_nsecs());
+
+	cl_assert((entry = git_index_get_bypath(repo_index, "a.txt", 0)));
+
+	/* if we are writing nanoseconds to the index, expect them to be
+	 * nonzero.
+	 */
+	if (expect_nsec) {
+		cl_assert(entry->ctime.nanoseconds != 0);
+		cl_assert(entry->mtime.nanoseconds != 0);
+	} else {
+		cl_assert_equal_i(0, entry->ctime.nanoseconds);
+		cl_assert_equal_i(0, entry->mtime.nanoseconds);
+	}
+}
+
+void test_index_nsec__status_doesnt_clear_nsecs(void)
+{
+	git_status_list *statuslist;
+
+	cl_git_pass(git_status_list_new(&statuslist, repo, NULL));
+
+	git_index_read(repo_index, 1);
+	cl_assert_equal_b(true, has_nsecs());
+
+	git_status_list_free(statuslist);
+}