win32: don't fsync parent directories on Windows

Windows doesn't support it.

src/fileops.c

@@ -1127,6 +1127,10 @@ void git_futils_filestamp_set_from_stat(
 
 int git_futils_fsync_dir(const char *path)
 {
+#ifdef GIT_WIN32
+	GIT_UNUSED(path);
+	return 0;
+#else
 	int fd, error = -1;
 
 	if ((fd = p_open(path, O_RDONLY)) < 0) {
@@ -1139,6 +1143,7 @@ int git_futils_fsync_dir(const char *path)
 
 	p_close(fd);
 	return error;
+#endif
 }
 
 int git_futils_fsync_parent(const char *path)

tests/pack/packbuilder.c

@@ -200,11 +200,20 @@ void test_pack_packbuilder__does_not_fsync_by_default(void)
 
 void test_pack_packbuilder__fsync_when_asked(void)
 {
+	/* We fsync the packfile and index.  On non-Windows, we also fsync
+	 * the parent directories.
+	 */
+#ifdef GIT_WIN32
+	int expected = 2;
+#else
+	int expected = 4;
+#endif
+
 	cl_git_pass(git_libgit2_opts(GIT_OPT_ENABLE_SYNCHRONOUS_OBJECT_CREATION, 1));
 	p_fsync__cnt = 0;
 	seed_packbuilder();
 	git_packbuilder_write(_packbuilder, ".", 0666, NULL, NULL);
-	cl_assert_equal_sz(4, p_fsync__cnt);
+	cl_assert_equal_sz(expected, p_fsync__cnt);
 }
 
 static int foreach_cb(void *buf, size_t len, void *payload)

tests/refs/create.c

@@ -323,13 +323,24 @@ void test_refs_create__fsyncs_when_requested(void)
 	git_refdb *refdb;
 	git_oid id;
 
+	/* Creating a loose ref involves fsync'ing the reference, the
+	 * reflog and (on non-Windows) the containing directories.
+	 * Creating a packed ref involves fsync'ing the packed ref file
+	 * and (on non-Windows) the containing directory.
+	 */
+#ifdef GIT_WIN32
+	int expected_create = 2, expected_compress = 1;
+#else
+	int expected_create = 4, expected_compress = 2;
+#endif
+
 	cl_git_pass(git_libgit2_opts(GIT_OPT_ENABLE_SYNCHRONOUS_OBJECT_CREATION, 1));
 	p_fsync__cnt = 0;
 
 	git_oid_fromstr(&id, current_master_tip);
 	cl_git_pass(git_reference_create(&ref, g_repo, "refs/heads/fsync_test", &id, 0, "log message"));
 	git_reference_free(ref);
-	cl_assert_equal_i(4, p_fsync__cnt);
+	cl_assert_equal_i(expected_create, p_fsync__cnt);
 
 	p_fsync__cnt = 0;
 
@@ -337,5 +348,5 @@ void test_refs_create__fsyncs_when_requested(void)
 	cl_git_pass(git_refdb_compress(refdb));
 	git_refdb_free(refdb);
 
-	cl_assert_equal_i(2, p_fsync__cnt);
+	cl_assert_equal_i(expected_compress, p_fsync__cnt);
 }