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#!/usr/bin/perl -w
=head1 NAME
Debconf::Db - debconf databases
=cut
package Debconf::Db;
use strict;
use Debconf::Log qw{:all};
use Debconf::Config;
use Debconf::DbDriver;
our $config;
our $templates;
=head1 DESCRIPTION
This class makes available a $Debconf::Db::config, which is the root db
driver for storing state, and a $Debconf::Db::templates, which is the root
db driver for storing template data.
Requests can be sent directly to the db's by things like
$Debconf::Db::config->setfield(...)
=head1 CLASS METHODS
=item load
Loads up the database drivers.
If a hash of parameters are passed, those parameters are used as the defaults
for *every* database driver that is loaded up. Practically, setting
(readonly => "true") is the only use of this.
=cut
sub load {
my $class=shift;
Debconf::Config->load('', @_); # load default config file
$config=Debconf::DbDriver->driver(Debconf::Config->config);
if (not ref $config) {
die "Configuration database \"".Debconf::Config->config.
"\" was not initialized.\n";
}
$templates=Debconf::DbDriver->driver(Debconf::Config->templates);
if (not ref $templates) {
die "Template database \"".Debconf::Config->templates.
"\" was not initialized.\n";
}
}
=item makedriver
Set up a driver. Pass it all the fields the driver needs, and one more
field, called "driver" that specifies the type of driver to make.
=cut
sub makedriver {
my $class=shift;
my %config=@_;
my $type=$config{driver} or die "driver type not specified (perhaps you need to re-read debconf.conf(5))";
# Make sure that the class is loaded..
if (! UNIVERSAL::can("Debconf::DbDriver::$type", 'new')) {
eval qq{use Debconf::DbDriver::$type};
die $@ if $@;
}
delete $config{driver}; # not a field for the object
# Make object, and pass in the config, and we're done with it.
debug db => "making DbDriver of type $type";
"Debconf::DbDriver::$type"->new(%config);
}
=item save
Save the databases, and shutdown the drivers.
=cut
sub save {
# FIXME: Debconf::Db->save shutdown only
# drivers which are declared in Config and Templates fields
# in conf file while load method (see above) make and init ALL drivers
$config->shutdown if $config;
# FIXME: if debconf is killed right here, the db is inconsistent.
$templates->shutdown if $templates;
$config='';
$templates='';
}
=head1 AUTHOR
Joey Hess <joeyh@debian.org>
=cut
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