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       Debconf::Client::ConfModule - client module for ConfModules


        use Debconf::Client::ConfModule ':all';
        my $capb=capb('backup');
        input("medium", "foo/bar");
        my @ret=go();
        if ($ret[0] == 30) {
               # Back button pressed.


       This is a module to ease writing ConfModules for Debian’s configuration
       management system. It can communicate with a FrontEnd via the debconf
       protocol (which is documented in full in the debconf_specification in
       Debian policy).

       The design is that each command in the protocol is represented by one
       function in this module (with the name lower-cased).  Call the function
       and pass in any parameters you want to follow the command. If the
       function is called in scalar context, it will return any textual return
       code. If it is called in list context, an array consisting of the
       numeric return code and the textual return code will be returned.

       This module uses Exporter to export all functions it defines. To import
       everything, simply import ":all".

           Ensure that a FrontEnd is running.  It’s a little hackish. If
           DEBIAN_HAS_FRONTEND is set, a FrontEnd is assumed to be running.
           If not, one is started up automatically and stdin and out are
           connected to it. Note that this function is always run when the
           module is loaded in the usual way.

           The frontend doesn’t send a return code here, so we cannot try to
           read it or we’ll block.

           Creates handler functions for commands on the fly.


       The debconf specification


       Joey Hess <>