Config::Model::Debian::Dependency(3pm)			User Contributed Perl Documentation		    Config::Model::Debian::Dependency(3pm)

NAME

       Config::Model::Debian::Dependency - Checks Debian dependency declarations

VERSION

       version 2.021

SYNOPSIS

	use Config::Model ;
	use Log::Log4perl qw(:easy) ;
	use Data::Dumper ;

	Log::Log4perl->easy_init($WARN);

	# define configuration tree object
	my $model = Config::Model->new ;
	$model ->create_config_class (
	   name => "MyClass",
	   element => [
	       Depends => {
		   'type'	=> 'leaf',
		   'value_type' => 'uniline',
		   class => 'Config::Model::Debian::Dependency',
	       },
	   ],
	) ;

	my $inst = $model->instance(root_class_name => 'MyClass' );

	my $root = $inst->config_root ;

	$root->load( 'Depends="libc6 ( >= 1.0 )"') ;
	# Connecting to qa.debian.org to check libc6 versions. Please wait ...
	# Warning in 'Depends' value 'libc6 ( >= 1.0 )': unnecessary
	# versioned dependency: >= 1.0. Debian has lenny-security ->
	# 2.7-18lenny6; lenny -> 2.7-18lenny7; squeeze-security ->
	# 2.11.2-6+squeeze1; squeeze -> 2.11.2-10; wheezy -> 2.11.2-10; sid
	# -> 2.11.2-10; sid -> 2.11.2-11;

DESCRIPTION

       This class is derived from Config::Model::Value. Its purpose is to check the value of a Debian package dependency for the following:

       o   syntax as described in http://www.debian.org/doc/debian-policy/ch-relationships.html

       o   Whether the version specified with ">" or ">=" is necessary.  This module will check with Debian server whether older versions can be
	   found in Debian old-stable or not. If no older version can be found, a warning will be issued. Note a warning will also be sent if the
	   package is not found on madison and if the package is not virtual.

       o   Whether a Perl library is dual life. In this case the dependency is checked according to Debian Perl policy <http://pkg-
	   perl.alioth.debian.org/policy.html#debian_control_handling>.  Because Debian auto-build systems (buildd) will use the first available
	   alternative, the dependency should be in the form :

	   o   "perl (>= 5.10.1) | libtest-simple-perl (>= 0.88)" when the required perl version is available in sid. ".

	   o   "libcpan-meta-perl | perl (>= 5.13.10)" when the Perl version is not available in sid

Cache
       Queries to Debian server are cached in "~/.config_model_depend_cache" for about one month.

BUGS

       o   Virtual package names are found scanning local apt cache. Hence an unknown package on your system may a virtual package on another
	   system.

       o   More advanced checks can probably be implemented. The author is open to new ideas. He's even more open to patches (with tests).

AUTHOR

       Dominique Dumont, ddumont [AT] cpan [DOT] org

SEE ALSO

       Config::Model, Config::Model::Value, Memoize, Memoize::Expire

perl v5.14.2							    2012-11-09				    Config::Model::Debian::Dependency(3pm)