Debian::AptContents - parse/search through apt-file's Contents files

    my $c = Debian::AptContents->new( { homedir => '~/.dh-make-perl' } );
    my @pkgs = $c->find_file_packages('/usr/bin/foo');
    my $dep = $c->find_perl_module_package('Foo::Bar');

This needs to really work not only for Perl modules.

A module specific to Perl modules is needed by dh-make-perl, but it can subclass Debian::AptContents, which needs to become more generic.

new

Constructs new instance of the class. Expects at least homedir option.

homedir

(mandatory) Directory where the object stores its cache.

contents_dir

Directory where apt-file stores Contents files are stored. Default is /var/cache/apt/apt-file

sources

A path to a sources.list file or an array ref of paths to sources.list files. If not given uses AptPkg's Config to get the list.

dist

Used for filtering on the distributon part of the repository paths listed in sources.list. Default is empty, meaning no filtering.

contents_files

Arrayref of Contents file names. Default is to parse the files in sources and to look in contents_dir for matching files.

cache_file

Path to the file with cached parsed information from all Contents files. Default is Contents.cache under homedir.

cache

Filled by read_cache. Used by find_file_packages and (obviously) store_cache

verbose

Verbosity level. 0 means silent, the bigger the more the jabber. Default is 1.

warning

Used internally. Given a verbosity level and a message, prints the message to STDERR if the verbosity level is greater than or equal of the value of verbose.

repo_source_to_contents_path

Given a line with Deban package repository path (typically taken from sources.list), converts it to the correspondinf Contents file name.

get_contents_files

Reads sources.list, gives the repository paths to repo_source_to_contents_path and returns an arrayref of file names of Contents files.

read_cache

Reads the cached parsed Contents files. If there are Contents files with more recent mtime than that of the cache (or if there is no cache at all), parses all Contents and stores the cache via store_cache for later invocation.

store_cache

Writes the contents of the parsed cache to the cache_file.

Storable is used to stream the data. Along woth the information from Contents files, a timestamp is stored.

find_file_packages

Returns a list of packages where the given file was found.

Contents files store the package section together with package name. That is stripped.

Returns an empty list of the file is not found in any package.

find_perl_module_package( $module, $version )

Given Perl module name (e.g. Foo::Bar), returns a Debian::Dependency object representing the required Debian package and version. If the module is a core one, suitable dependency on perl is returned.

If the package is also available in a separate package, an alternative dependency is returned.

In case the version of the currently running Perl interpreter is lower than the version in which the wanted module is available in core, the separate package is preferred. Otherwise the perl dependency is the first alternative.

Damyan Ivanov <dmn@debian.org>

Copyright (C) 2008, 2009, 2010 Damyan Ivanov <dmn@debian.org>

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License version 2 as published by the Free Software Foundation.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.