Function write_pack_file

builtin/pack-objects.c:1331–1512

);

static void write_pack_file(void)
{
	uint32_t i = 0, j;
	struct hashfile *f;
	off_t offset;
	uint32_t nr_remaining = nr_result;
	time_t last_mtime = 0;
	struct object_entry **write_order;

	if (progress > pack_to_stdout)
		progress_state = start_progress(the_repository,
						_("Writing objects"), nr_result);
	ALLOC_ARRAY(written_list, to_pack.nr_objects);
	write_order = compute_write_order();

	do {
		unsigned char hash[GIT_MAX_RAWSZ];
		char *pack_tmp_name = NULL;

		if (pack_to_stdout) {
			/*
			 * This command is most often invoked via
			 * git-upload-pack(1), which will typically chunk data
			 * into pktlines. As such, we use the maximum data
			 * length of them as buffer length.
			 *
			 * Note that we need to subtract one though to
			 * accommodate for the sideband byte.
			 */
			struct hashfd_options opts = {
				.progress = progress_state,
				.buffer_len = LARGE_PACKET_DATA_MAX - 1,
			};
			f = hashfd_ext(the_repository->hash_algo, 1,
				       "<stdout>", &opts);
		} else {
			f = create_tmp_packfile(the_repository, &pack_tmp_name);
		}

		offset = write_pack_header(f, nr_remaining);

		if (reuse_packfiles_nr) {
			assert(pack_to_stdout);
			for (j = 0; j < reuse_packfiles_nr; j++) {
				reused_chunks_nr = 0;
				write_reused_pack(&reuse_packfiles[j], f);
				if (reused_chunks_nr)
					reuse_packfiles_used_nr++;
			}
			offset = hashfile_total(f);
		}

		nr_written = 0;
		for (; i < to_pack.nr_objects; i++) {
			struct object_entry *e = write_order[i];
			if (write_one(f, e, &offset) == WRITE_ONE_BREAK)
				break;
			display_progress(progress_state, written);