set baseUri https://urn.to/r/pkgd
    }

    #
    # NOTE: The URI where a single package file may be found.  This file will
    #       belong to a specific version of one package.
    #
    variable downloadUri; # DEFAULT: ${baseUri}?...&filename=${fileName}

    if {![info exists downloadUri]} then {
      set downloadUri {${baseUri}?download&ci=trunk&filename=${fileName}}
    }

    #
    # NOTE: The root directory where any persistent packages will be saved.
    #
    variable persistentRootDirectory; # DEFAULT: [getPersistentRootDirectory]

    variable temporaryRootDirectory; # DEFAULT: [getFileTempDirectory PKGD_TEMP]

    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 {} {

        }
      }
    } else {
      error "unsupported language, no idea how to modify auto-path"
    }
  }

  #
  # NOTE: This procedure verifies the combination of language and version
  #       specified by the caller.  The language argument must be one of the
  #       literal strings "eagle", "tcl", or "client".  The version argument
  #       must be one of the literal strings "8.4", "8.5", or "8.6" when the
  #       language is "tcl" -OR- the literal string "1.0" when the language
  #       is either "eagle" or "client".  The varName argument is the name
  #       of a scalar variable in the context of the immediate caller that
  #       will receive a boolean value indicating if the specified language
  #       is actually a reference to the package downloader client itself.
  #
  proc verifyLanguageAndVersion { language version varName } {
    if {[string length $varName] > 0} then {
      upvar 1 $varName isClient
    }

    set isClient false

    if {[string length $language] == 0 || $language eq "eagle"} then {
      if {$version ne "1.0"} then {
        error "unsupported Eagle version"
      }
    } elseif {$language eq "tcl"} then {
      if {$version ne "8.4" && $version ne "8.5" && $version ne "8.6"} then {
        error "unsupported Tcl version"
      }
    } elseif {$language eq "client"} then {
      if {$version ne "1.0"} then {
        error "unsupported client version"
      }

      set isClient true
    } else {
      error "unsupported language"
    }
  }

  #
  # NOTE: This procedure checks if there is a higher version available of the
  #       specified package on the package file server.  The language argument
  #       must be one of the literal strings "eagle", "tcl", or "client".  The
  #       version argument must be one of the literal strings "8.4", "8.5", or
  #       "8.6" when the language is "tcl" -OR- the literal string "1.0" when
  #       the language is either "eagle" or "client".  The packageName argument
  #       is a directory name relative to the language and version-specific
  #       directory on the package file server and may be an empty string.  The
  #       usePgp argument should be non-zero when an OpenPGP signature file
  #       needs to be downloaded and verified for the downloaded file.
  #
  # <public>
  proc checkForHigherVersion { language version packageName usePgp } {
    variable clientDirectory
    variable temporaryRootDirectory

    verifyLanguageAndVersion $language $version isClient

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

    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 \
        [string trim [readFile $downloadFileName]] \
        [string trim [readFile $localFileName]]] > 0} then {
      return true
    } else {
      return false
    }
  }

  #
  # 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
  #       already downloaded (i.e. since OpenPGP needs both to perform the
  #       signature checks).  The language argument must be one of the

    #
    # NOTE: Then, in one step, download the file from the package file
    #       server and write it to the specified local file.
    #
    if {[isEagle]} then {
      writeFile $localFileName [interp readorgetscriptfile -- "" $uri]
    } else {
      writeFile $localFileName [::PackageRepository::getFileViaHttp \
          $uri 10 stdout $quiet -binary true]
    }

    #
    # NOTE: Is use of OpenPGP for signature verification enabled?  Also,
    #       did we just download an OpenPGP signature file?
    #
    if {$usePgp && [isPgpSignatureFileName $localFileName true]} then {

  # <public>
  proc downloadFiles {
          language version fileNames persistent usePgp useAutoPath } {
    variable clientDirectory
    variable persistentRootDirectory
    variable temporaryRootDirectory


    verifyLanguageAndVersion $language $version isClient


















    set temporaryDirectory [file join \
        $temporaryRootDirectory [appendArgs \

        pkgd_lib_ [getUniqueDirectorySuffix]]]

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

    set downloadedFileNames [list]

      if {$persistent} then {
        set fileNameOnly [lindex $downloadedFileName 0]
        set directory(persistent) [lindex $downloadedFileName 2]

        file mkdir $directory(persistent)
        set command [list file copy]

        if {$isClient} then {
          lappend command -force
        }

        lappend command --
        lappend command [file join $directory(temporary) $fileNameOnly]
        lappend command [file join $directory(persistent) $fileNameOnly]

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