Function get_rev

negotiator/default.c:108–148

* Get the next rev to send, ignoring the common. */

 * Get the next rev to send, ignoring the common.
 */
static const struct object_id *get_rev(struct negotiation_state *ns)
{
	struct commit *commit = NULL;

	while (commit == NULL) {
		unsigned int mark;
		struct commit_list *parents;

		if (ns->rev_list.nr == 0 || ns->non_common_revs == 0)
			return NULL;

		commit = prio_queue_get(&ns->rev_list);
		repo_parse_commit(the_repository, commit);
		parents = commit->parents;

		commit->object.flags |= POPPED;
		if (!(commit->object.flags & COMMON))
			ns->non_common_revs--;

		if (commit->object.flags & COMMON) {
			/* do not send "have", and ignore ancestors */
			commit = NULL;
			mark = COMMON | SEEN;
		} else if (commit->object.flags & COMMON_REF)
			/* send "have", and ignore ancestors */
			mark = COMMON | SEEN;
		else
			/* send "have", also for its ancestors */
			mark = SEEN;

		while (parents) {
			if (!(parents->item->object.flags & SEEN))
				rev_list_push(ns, parents->item, mark);
			if (mark & COMMON)
				mark_common(ns, parents->item, 1, 0);
			parents = parents->next;
		}
	}

	return &commit->object.oid;
}

static void known_common(struct fetch_negotiator *n, struct commit *c)
{