You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: docker.go
    path of file: ./repos/cockroach/pkg/acceptance/cluster
    
    the code of the file until where you have to start completion: // Copyright 2015 The Cockroach Authors.
//
// Use of this software is governed by the Business Source License
// included in the file licenses/BSL.txt.
//
// As of the Change Date specified in that file, in accordance with
// the Business Source License, use of this software will be governed
// by the Apache License, Version 2.0, included in the file
// licenses/APL.txt.

package cluster

import (
	"context"
	"encoding/binary"
	"fmt"
	"io"
	"math"
	"net"
	"net/url"
	"os"
	"os/user"
	"path/filepath"
	"strconv"
	"strings"
	"time"

	"github.com/cockroachdb/cockroach/pkg/util/log"
	"github.com/cockroachdb/cockroach/pkg/util/log/severity"
	"github.c
    
func getNonRootContainerUser() (string, error) {
	// This number is Debian-specific, but for now all of our acceptance test
	// containers are based on Debian.
	// See: https://www.debian.org/doc/debian-policy/#uid-and-gid-classes
	const minUnreservedID = 101
	user, err := user.Current()
	if err != nil {
		return "", err
	}
	uid, err := strconv.Atoi(user.Uid)
	if err != nil {
		return "", errors.Wrap(err, "looking up host UID")
	}
	if uid < minUnreservedID {
		return "", fmt.Errorf("host UID %d in container's reserved UID space", uid)
	}
	gid, err := strconv.Atoi(user.Gid)
	if err != nil {
		return "", errors.Wrap(err, "looking up host GID")
	}
	if gid < minUnreservedID {
		// If the GID is in the reserved space, silently upconvert to the known-good
		// UID. We don't want to return an error because users on a macOS host
		// typically have a GID in the reserved space, and this upconversion has
		// been empirically verified to not cause ownership issues.
		gid = uid
	}
	return fmt.Sprintf("%d:%d", uid, gid), nil
}