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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". =over 4 =cut package Debconf::Client::ConfModule; use strict; use base qw(Exporter); # List all valid commands here. our @EXPORT_OK=qw(version capb stop reset title input beginblock endblock go unset set get register unregister clear previous_module start_frontend fset fget subst purge metaget visible exist settitle info progress data x_loadtemplatefile); # Import :all to get everything. our %EXPORT_TAGS = (all => [@EXPORT_OK]); # Set up valid command lookup hash. my %commands; map { $commands{uc $_}=1; } @EXPORT_OK; # Unbuffered output is required. $|=1; =item import 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. =cut sub import { if (! $ENV{DEBIAN_HAS_FRONTEND}) { $ENV{PERL_DL_NONLAZY}=1; if (exists $ENV{DEBCONF_USE_CDEBCONF} and $ENV{DEBCONF_USE_CDEBCONF} ne '') { exec "/usr/lib/cdebconf/debconf", $0, @ARGV; } else { exec "/usr/share/debconf/frontend", $0, @ARGV; } } # Make the Exporter still work. Debconf::Client::ConfModule->export_to_level(1, @_); # A truly gross hack. This is only needed if # /usr/share/debconf/confmodule is loaded, and then this # perl module is used. In that case, this module needs to write # to fd #3, rather than stdout. See changelog 0.3.74. if (exists $ENV{DEBCONF_REDIR} && $ENV{DEBCONF_REDIR}) { open(STDOUT,">&3"); } } =item stop The frontend doesn't send a return code here, so we cannot try to read it or we'll block. =cut sub stop { print "STOP\n"; return; } =item AUTOLOAD Creates handler functions for commands on the fly. =cut sub AUTOLOAD { my $command = uc our $AUTOLOAD; $command =~ s|.*:||; # strip fully-qualified portion die "Unsupported command `$command'." unless $commands{$command}; no strict 'refs'; *$AUTOLOAD = sub { my $c=join (' ', $command, @_); # Newlines in input can really badly confuse the protocol, so # detect and warn. if ($c=~m/\n/) { warn "Warning: Newline present in parameters passed to debconf.\n"; warn "This will probably cause strange things to happen!\n"; } print "$c\n"; my $ret=; chomp $ret; my @ret=split(/\s/, $ret, 2); if ($ret[0] eq '1') { # escaped data local $_; my $unescaped=''; for (split /(\\.)/, $ret[1]) { s/\\(.)/$1 eq "n" ? "\n" : $1/eg; $unescaped.=$_; } $ret[0]='0'; $ret[1]=$unescaped; } return @ret if wantarray; return $ret[1]; }; goto &$AUTOLOAD; } =back =head1 SEE ALSO The debconf specification (/usr/share/doc/debian-policy/debconf_specification.txt.gz). =head1 AUTHOR Joey Hess =cut 1