Function write_midx_bitmap

midx-write.c:881–955

}

static int write_midx_bitmap(struct write_midx_context *ctx,
			     const unsigned char *midx_hash,
			     struct packing_data *pdata,
			     struct commit **commits,
			     uint32_t commits_nr,
			     unsigned flags)
{
	int ret;
	uint16_t options = 0;
	struct bitmap_writer writer;
	struct pack_idx_entry **index;
	struct strbuf bitmap_name = STRBUF_INIT;

	trace2_region_enter("midx", "write_midx_bitmap", ctx->repo);

	if (ctx->incremental)
		get_split_midx_filename_ext(ctx->source, &bitmap_name,
					    midx_hash, MIDX_EXT_BITMAP);
	else
		get_midx_filename_ext(ctx->source, &bitmap_name,
				      midx_hash, MIDX_EXT_BITMAP);

	if (flags & MIDX_WRITE_BITMAP_HASH_CACHE)
		options |= BITMAP_OPT_HASH_CACHE;

	if (flags & MIDX_WRITE_BITMAP_LOOKUP_TABLE)
		options |= BITMAP_OPT_LOOKUP_TABLE;

	/*
	 * Build the MIDX-order index based on pdata.objects (which is already
	 * in MIDX order; c.f., 'midx_pack_order_cmp()' for the definition of
	 * this order).
	 */
	ALLOC_ARRAY(index, pdata->nr_objects);
	for (uint32_t i = 0; i < pdata->nr_objects; i++)
		index[i] = &pdata->objects[i].idx;

	bitmap_writer_init(&writer, ctx->repo, pdata,
			   ctx->incremental ? ctx->base_midx : NULL);
	bitmap_writer_show_progress(&writer, flags & MIDX_PROGRESS);
	bitmap_writer_build_type_index(&writer, index);

	/*
	 * bitmap_writer_finish expects objects in lex order, but pack_order
	 * gives us exactly that. use it directly instead of re-sorting the
	 * array.
	 *
	 * This changes the order of objects in 'index' between
	 * bitmap_writer_build_type_index and bitmap_writer_finish.
	 *
	 * The same re-ordering takes place in the single-pack bitmap code via
	 * write_idx_file(), which is called by finish_tmp_packfile(), which
	 * happens between bitmap_writer_build_type_index() and
	 * bitmap_writer_finish().
	 */
	for (uint32_t i = 0; i < pdata->nr_objects; i++)
		index[ctx->pack_order[i]] = &pdata->objects[i].idx;