if {![info exists temporaryRootDirectory]} then {
      set temporaryRootDirectory \
          [::PackageRepository::getFileTempDirectory PKGD_TEMP]
    }
  }

  #
  # NOTE: This procedure returns a directory name suffix that is unique to
  #       the running process at the current point in time.  There are no
  #       arguments.
  #
  proc getUniqueDirectorySuffix {} {
    return [appendArgs \
        [string trim [pid] -] _ [string trim [clock seconds] -]]
  }

  #
  # NOTE: This procedure returns the root directory where any packages that
  #       are downloaded should be saved to permanent storage for subsequent
  #       use.  There are no arguments.
  #
  proc getPersistentRootDirectory {} {
    #

    variable clientDirectory
    variable temporaryRootDirectory

    verifyLanguageAndVersion $language $version isClient

    set temporaryDirectory [file join \
        $temporaryRootDirectory [appendArgs \
        pkgd_ver_ [getUniqueDirectorySuffix]]]
        pkgd_ver_ [::PackageRepository::getUniqueSuffix]]]

    if {$isClient} then {
      set persistentDirectory $clientDirectory
    } else {
      set persistentDirectory $persistentRootDirectory
    }

    set fileName [file join $packageName VERSION]
    set downloadFileName [file join $temporaryDirectory $fileName]

    file mkdir [file dirname $downloadFileName]
    downloadOneFile $language $version $fileName $downloadFileName $usePgp

    if {$usePgp} then {
      downloadOneFile $language $version [appendArgs $fileName .asc] \
          [appendArgs $downloadFileName .asc] $usePgp
    }

    set localFileName [file join $persistentDirectory $fileName]

    if {[package vcompare \
    set compare [package vcompare \
        [string trim [readFile $downloadFileName]] \
        [string trim [readFile $localFileName]]] > 0} then {
        [string trim [readFile $localFileName]]]
      return true
    } else {
      return false
    }

    file delete -force -- $temporaryDirectory
    return [expr {$compare > 0}]
  }

  #
  # NOTE: This procedure downloads a single file from the package file server,
  #       writing its contents to the specified local file name.  It can also
  #       verify the OpenPGP signatures.  When an OpenPGP signature file is
  #       downloaded, this procedure assumes the corresponding data file was

    variable persistentRootDirectory
    variable temporaryRootDirectory

    verifyLanguageAndVersion $language $version isClient

    set temporaryDirectory [file join \
        $temporaryRootDirectory [appendArgs \
        pkgd_lib_ [getUniqueDirectorySuffix]]]
        pkgd_lib_ [::PackageRepository::getUniqueSuffix]]]

    if {$isClient} then {
      set persistentDirectory $clientDirectory
    } else {
      set persistentDirectory $persistentRootDirectory
    }

    set downloadDirectories [lsort -unique $downloadDirectories]

    if {$useAutoPath} then {
      foreach downloadDirectory $downloadDirectories {
        addToAutoPath $language $downloadDirectory
      }
    }

    if {$persistent} then {
      file delete -force -- $temporaryDirectory
    }

    return $downloadDirectories
  }

  #
  # NOTE: This package requires the package repository client package.
  #