private void EnsureNuGetExe()
        {
            if (_fileStorageSvc.FileExists(Constants.DownloadsFolderName, "nuget.exe"))
            {
                // Ensure the file exists on blob storage.
                return;
            }

            lock (fileLock)
            {
                var package = _packageSvc.FindPackageByIdAndVersion("NuGet.CommandLine", version: null, allowPrerelease: false);
                if (package == null)
                {
                    throw new InvalidOperationException("Unable to find NuGet.CommandLine.");
                }

                using (var packageStream = _packageFileSvc.DownloadPackageFile(package))
                {
                    var zipPackage = new ZipPackage(packageStream);
                    ExtractNuGetExe(zipPackage);
                }
            }
        }