Function bitmap_builder_init

pack-bitmap-write.c:431–563

};

static void bitmap_builder_init(struct bitmap_builder *bb,
				struct bitmap_writer *writer,
				struct bitmap_index *old_bitmap)
{
	struct rev_info revs;
	struct commit *commit;
	struct commit_list *reusable = NULL;
	struct commit_list *r;
	unsigned int i, num_maximal = 0;

	init_bb_data(&bb->data);
	commit_stack_init(&bb->commits);

	reset_revision_walk();
	repo_init_revisions(writer->to_pack->repo, &revs, NULL);
	revs.topo_order = 1;
	revs.first_parent_only = 1;

	for (i = 0; i < bitmap_writer_nr_selected_commits(writer); i++) {
		struct bitmapped_commit *bc = &writer->selected[i];
		struct bb_commit *ent = bb_data_at(&bb->data, bc->commit);

		if (bc->pseudo_merge)
			BUG("unexpected pseudo-merge at %"PRIuMAX,
			    (uintmax_t)i);

		ent->selected = 1;
		ent->maximal = 1;
		ent->pseudo_merge = 0;
		ent->idx = i;

		ent->commit_mask = bitmap_new();
		bitmap_set(ent->commit_mask, i);

		add_pending_object(&revs, &bc->commit->object, "");
	}

	if (prepare_revision_walk(&revs))
		die("revision walk setup failed");

	while ((commit = get_revision(&revs))) {
		struct commit_list *p = commit->parents;
		struct bb_commit *c_ent;

		parse_commit_or_die(commit);

		c_ent = bb_data_at(&bb->data, commit);

		/*
		 * If there is no commit_mask, there is no reason to iterate
		 * over this commit; it is not selected (if it were, it would
		 * not have a blank commit mask) and all its children have
		 * existing bitmaps (see the comment starting with "This commit
		 * has an existing bitmap" below), so it does not contribute
		 * anything to the final bitmap file or its descendants.
		 */
		if (!c_ent->commit_mask)
			continue;