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       Debian::Packages::Compare - emdebian repository comparison support


       Version 0.2.0


       Read the Packages file, create a hash of Package and version - once per
       arch, one per suite, one pair per repo. The underlying libparse-debian-
       packages-perl is a very simple module, there probably isn’t any point
       putting extra data into the comparison hashes, get the data necessary
       and load the full Packages data separately using get_single_package.

       This module is currently tied to the repository layout used by reprepro
       in order to identify the architecture list and various other pieces of
       meta-data. In time, functions can be added to provide such lists.

       The module expects to find all repositories beneath a single base


       If $base is undefined or if the repository directories cannot be found,
       subsequent functions each return undef.


       Example code:

        use Debian::Packages::Compare;

        my $base = '/path/to/repositories/'

        my $debu  = &read_packages ('unstable', 'filter');
        my $gripu = &read_packages ('unstable', 'grip');
        my %debianunstable = %$debu  if (defined $debu);
        my %gripunstable   = %$gripu if (defined $gripu);
        foreach my $pkg (sort keys %debianunstable)
          if ($debianunstable{$pkg}{'source'} ne $gripunstable{$pkg}{'source'})
            # $pkg is either not in grip repository or is a different version

       The main features for subsequent versions will involve more verbose
       error handling.

        perl -MDebian::Packages::Compare -MData::Dumper -e '&set_base("/opt/reprepro"); \
         $c = &read_packages("testing","grip"); print Dumper ($$c{"dpkg"});';


       Requires the reprepro file layout, currently.

       Reads the supported architectures and returns a list.


       Requires the reprepro file layout, currently.

       Reads the supported locale roots and returns a list.


       Similar to get_locale_roots but for ordinary repositories so that
       component splits (like dev and doc in Emdebian Grip) can be implicitly
       supported. Note that repositories with contrib or non-free will likely
       get confused results with this kind of support.


       Parses the conf/distributions file for the specified repository and
       retrieves the list of configured suite names - a collated unique list
       of the Suite: and Codename: variables in conf/distributions.


       Parses the conf/distributions file for the specified repository and
       retrieves the list of configured suite names that are NOT ReadOnly.
       Codename: variables are NOT included.


       Set the base directory of the repository (repositories) to be compared.
       The module expects to find all repositories beneath a single base



       Similar to read_binaries but expects a GZip compressed Sources.gz file.
       Not usually called directly.


       Reads the Packages file and creates a hash of the packages,
       architectures and versions in the respective repository (under the
       $base directory) and suite for the defined @archlist, including details
       of Sources.

       Takes two parameters - the suite name and the repository name.

       Returns undef if the Packages file cannot be found.

       e.g. for the Grip repository:

        $hash{'sed'}{'source'} => '4.1.5-8'
        $hash{'sed'}{'armel'} => '4.1.5-8em1'


       Specialised function that handles the locale-root organisation of the
       TDeb repository. The internal locale root component structure is hidden
       in the returned hash, the component name is listed separately and
       contained in the package name. Source data is retained under the
       original source package name and referenced in the hash:

       The locale root is contained in $list{$package}{'locale'} and the
       source package name in $list{$package}{'source'}


        $hash{'sed-locale-pt-br}{'source'} => 'sed'
        $hash{'sed-locale-pt-br}{'locale'} => 'pt'
        $hash{'sed-locale-pt-br}{'armel'} => '4.1.5-8'
        $hash{'sed'}{'source'} => '4.1.5-8'


       Retrieve the full Packages record for a single package, binary (single
       architecture) or source (.dsc).


       Compare two repositories for the same suite and return a list of source
       packages that are in the first repository but not in the second. (Older
       versions are ignored.)

       TODO: need a get_outdated_sources and get_outdated_binaries too.


       Compare two repositories for the same suite and return a list of binary
       packages that exist in both repositories as source packages but only
       exist as binary packages in the first repository, not in the second.

       Emdebian version suffixes are automatically cleared in the comparison.


       Compare two repositories, each with unstable and testing, return a list
       of source packages that are suitable for migration.

       To be suitable for migration, a package must exist in the first
       repository at the same version in both unstable and testing. It must
       also exist in the second repository for unstable and be the same
       version as in the first repository. Finally, the source package must
       either be absent from testing in the second repository or be at a lower
       version than in unstable.

       This is a Debian-only feature and no support is available for
       repositories that do not implement unstable and testing suites in
       precisely the same manner as Debian.

       All data is reloaded fresh each time the function is run.

        1. repo1 unstable must match repo1 testing
        2. repo1 unstable must match repo2 unstable
        3. repo2 unstable must B<be newer> than repo2 testing
        4. All architectures are compared, including source.

       Returns undef in case of error.

       The returned hash is indexed under the source package name.

       To get the list of packages that raised a complaint about missing
       sources, call get_britney_complaint - the returned list will be
       undefined unless get_britney_list has already been called.


       If get_britney_list comes up with source packages that are missing for
       a testing migration, get_britney_complaint returns the list of source
       package names that were identified.

       If get_britney_list has not been called, returns undef.

       If there are no complaints, also returns undef.

Copyright and Licence

        Copyright (C) 2008  Neil Williams <>

        This package is free software; you can redistribute it and/or modify
        it under the terms of the GNU General Public License as published by
        the Free Software Foundation; either version 3 of the License, or
        (at your option) any later version.

        This program is distributed in the hope that it will be useful,
        but WITHOUT ANY WARRANTY; without even the implied warranty of
        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, see <>.


       Neil Williams, "<>"


       Please report any bugs or feature requests to the Debian Bug Tracking
       System using "reportbug libdebian-packages-compare-perl".