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: client.go
    path of file: ./repos/storj/private/version/checker
    
    the code of the file until where you have to start completion: // Copyright (C) 2019 Storj Labs, Inc.
// See LICENSE for copying information.

package checker

import (
	"byt
    
func (client *Client) OldMinimum(ctx context.Context, serviceName string) (ver version.OldSemVer, err error) {
	defer mon.Task()(&ctx, serviceName)(&err)

	versions, err := client.All(ctx)
	if err != nil {
		return version.OldSemVer{}, Error.Wrap(err)
	}

	r := reflect.ValueOf(&versions)
	f := reflect.Indirect(r).FieldByName(serviceName).Interface()
	result, ok := f.(version.OldSemVer)
	if !ok {
		return version.OldSemVer{}, Error.New("invalid process name: %s", serviceName)
	}
	return result, nil
}