#!/usr/bin/perl

=head1 NAME

gen-preseed -- output preseed based on installation debconf DB

=head1 SYNOPSIS

gen-preseed

=head1 DESCRIPTION

Output a preseed file based on the installation debconf DB.
This requires /var/log/installer/cdebconf to exist.

=cut

use strict;
use warnings;
use Debconf::Db;
use Debconf::Template;
use Debconf::Question;

# A bit of a hack..
my $di_path;
if (-d "/var/log/installer") {
    $di_path="/var/log/installer/cdebconf";
} else {
    $di_path="/var/log/debian-installer/cdebconf";
}

if (! -f "$di_path") {
    print("Unable to find debconf database: $di_path\n");
    exit(1);
}

Debconf::Db->load(readonly => "true");

$Debconf::Db::config=Debconf::Db->makedriver(
    driver => "File", 
    name => "di_questions",
    filename => "$di_path/questions.dat",
    readonly => "true",
);
$Debconf::Db::templates=Debconf::Db->makedriver(
    driver => "File", 
    name => "di_templates",
    filename => "$di_path/templates.dat",
    readonly => "true",
);

my $defaultowner="d-i";
my @blacklist = (
                    # No partitioning preseeding at this point
                    "partman-",

                    # d-i state
                    "clock-setup/system-time-changed",
                    "debian-installer/main-menu",

                    # Value depends on hardware
                    "netcfg/choose_interface",

                    # Value depends on install media
                    "base-installer/kernel/image",
                    "base-installer/kernel/override-image",
                    "cdrom/codename",
                    "cdrom-detect/cdrom_device",
                    "hw-detect/select_modules",
                    "preseed/file",
                );
my $qi = Debconf::Question->iterator;

my @keys = ();

while (my $q = $qi->iterate) {
    my ($name, $type, $value, $default) = ($q->name, $q->type, $q->value, $q->default);
    next if ($default eq $value);
    next if (! length $type || $type eq 'text' || $type eq 'title');

    my $skip = 0;
    foreach (@blacklist) {
        if ($name =~ m/^$_/) {
            $skip = 1;
        }
    }
    next if ($skip eq 1);

    if ($q->owners) {
        foreach my $owner (split ", ", $q->owners) {
            push(@keys, "$owner\t$name\t$type\t$value\n");
        }
    }
    else {
        push(@keys, "$defaultowner\t$name\t$type\t$value\n");
    }
}

foreach(sort(@keys)) {
    print "$_";
}

=head1 AUTHOR

Written by:
  Stéphane Graber <stgraber@ubuntu.com>

Based on debconf-get-selections by:
  Petter Reinholdtsen <pere@hungry.com>

=cut