Function diff_get_merge_base

diff-lib.c:578–619

}

void diff_get_merge_base(const struct rev_info *revs, struct object_id *mb)
{
	int i;
	struct commit *mb_child[2] = {0};
	struct commit_list *merge_bases = NULL;

	for (i = 0; i < revs->pending.nr; i++) {
		struct object *obj = revs->pending.objects[i].item;
		if (obj->flags)
			die(_("--merge-base does not work with ranges"));
	}

	/*
	 * This check must go after the for loop above because A...B
	 * ranges produce three pending commits, resulting in a
	 * misleading error message.
	 */
	if (revs->pending.nr < 1 || revs->pending.nr > 2)
		BUG("unexpected revs->pending.nr: %d", revs->pending.nr);

	for (i = 0; i < revs->pending.nr; i++)
		mb_child[i] = lookup_commit_reference(the_repository, &revs->pending.objects[i].item->oid);
	if (revs->pending.nr == 1) {
		struct object_id oid;

		if (repo_get_oid(the_repository, "HEAD", &oid))
			die(_("unable to get HEAD"));

		mb_child[1] = lookup_commit_reference(the_repository, &oid);
	}

	if (repo_get_merge_bases(the_repository, mb_child[0], mb_child[1], &merge_bases) < 0)
		exit(128);
	if (!merge_bases)
		die(_("no merge base found"));
	if (merge_bases->next)
		die(_("multiple merge bases found"));

	oidcpy(mb, &merge_bases->item->object.oid);

	commit_list_free(merge_bases);
}

void run_diff_index(struct rev_info *revs, unsigned int option)
{