Function write_copy_table

refs/reftable-backend.c:1730–1940

};

static int write_copy_table(struct reftable_writer *writer, void *cb_data)
{
	struct write_copy_arg *arg = cb_data;
	uint64_t deletion_ts, creation_ts;
	struct reftable_ref_record old_ref = {0}, refs[2] = {0};
	struct reftable_log_record old_log = {0}, *logs = NULL;
	struct reftable_iterator it = {0};
	struct string_list skip = STRING_LIST_INIT_NODUP;
	struct ident_split committer_ident = {0};
	struct strbuf errbuf = STRBUF_INIT;
	size_t logs_nr = 0, logs_alloc = 0, i;
	const char *committer_info;
	int ret;

	committer_info = git_committer_info(0);
	if (split_ident_line(&committer_ident, committer_info, strlen(committer_info)))
		BUG("failed splitting committer info");

	if (reftable_stack_read_ref(arg->be->stack, arg->oldname, &old_ref)) {
		ret = error(_("refname %s not found"), arg->oldname);
		goto done;
	}
	if (old_ref.value_type == REFTABLE_REF_SYMREF) {
		ret = error(_("refname %s is a symbolic ref, copying it is not supported"),
			    arg->oldname);
		goto done;
	}

	/*
	 * There's nothing to do in case the old and new name are the same, so
	 * we exit early in that case.
	 */
	if (!strcmp(arg->oldname, arg->newname)) {
		ret = 0;
		goto done;
	}

	/*
	 * Verify that the new refname is available.
	 */
	if (arg->delete_old)
		string_list_insert(&skip, arg->oldname);
	ret = refs_verify_refname_available(&arg->refs->base, arg->newname,
					    NULL, &skip, 0, &errbuf);
	if (ret < 0) {
		error("%s", errbuf.buf);
		goto done;
	}

	/*
	 * When deleting the old reference we have to use two update indices:
	 * once to delete the old ref and its reflog, and once to create the
	 * new ref and its reflog. They need to be staged with two separate
	 * indices because the new reflog needs to encode both the deletion of
	 * the old branch and the creation of the new branch, and we cannot do
	 * two changes to a reflog in a single update.
	 */
	deletion_ts = creation_ts = reftable_stack_next_update_index(arg->be->stack);