#       argument is non-zero, any existing values will be overwritten and
  #       set back to their default values.
  #
  proc setupDownloadUriVars { force } {
    #
    # NOTE: The base URI used to build the URIs for the package file server.
    #
    variable baseUri; # DEFAULT: https://urn.to/r

    if {$force || ![info exists baseUri]} then {
      set baseUri https://urn.to/r
    }

    #
    # NOTE: The URI where the Package Signing Keys may be downloaded.  This
    #       should return a payload containing the OpenPGP key data.
    #
    variable openPgpKeyUri; # DEFAULT: ${baseUri}/${openPgpKeyUrn}