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C<--no-root-check> option was not specified, this method will return a command
string which wraps the supplied command in a call to either C<gksudo> or
C<sudo>.  For all other cases, C<command> is returned unmodified.

The C<gksudo> command is preferred since it gives the user a GUI prompt window
if it is necessary to prompt for a password.  This method handles the different
semantics required to pass environment variables through C<gksudo> and C<sudo>.

=head2 tick ( )

This timer event handler is used to take the child process exit status values
collected by the SIGCHLD handler and pass them to C<master_copy_finished> or
C<copy_finished> as appropriate.

=head2 update_key_progress ( udi, status )

Called from C<on_copier_pipe_read> to update the status icon for a specified
USB key device.  The progress parameter is a number in the range 0-10 for
copies in progress; -1 for a copy that has failed (non-zero exit status from
the 'writer' process); or -2 to indicate a device which did not match the
filter settings and is being ignored.