man Debian::AptContents (3): parse/search through apt-file's Contents files

SYNOPSIS

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');

TODO

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.

CONSTRUCTOR

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

FIELDS

homedir: (mandatory) Directory where the object stores its cache.
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 let apt-file find them.
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.

OBJECT METHODS

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".

get_contents_files

Reads sources.list, gives the repository paths to "repo_source_to_contents_paths" 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 with the information from Contents files, a time stamp 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.

AUTHOR

Damyan Ivanov <[email protected]>
gregor herrmann <[email protected]>

COPYRIGHT & LICENSE

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.