"could not change branch: " $error]
      }
    }
  }

  #
  # NOTE: This procedure attempts to stage the specified package file using
  #       Fossil.  The targetDirectory argument is the fully qualified path
  #       to the package platform directory.  The fileName argument is the
  #       relative name of the file to be staged.  This procedure may raise
  #       script errors.
  #
  proc stageOnePackageFile { targetDirectory fileName } {
    variable checkoutDirectory
    variable fossilAddCommand

    verifyCheckoutDirectory

    if {[isEagle]} then {
      set fileName [::PackageRepository::formatExecArgument $fileName]

      if {![::PackageRepository::createOpenPgpSignature \
          $checkoutFileName]} then {
        error [appendArgs \
            "could not stage file \"" $fileName \
            "\": OpenPGP signing failed"]
      }

      stageOnePackageFile $targetDirectory $relativeFileName
      stageOnePackageFile $targetDirectory [appendArgs $relativeFileName .asc]
    }
  }

  #
  # NOTE: This procedure attempts to commit the staged package files to the
  #       remote package file repository using Fossil.  The varName argument
  #       is the name of a scalar variable in the context of the immediate