package URPM;

use strict;
use DynaLoader;

# different files, but same package
# require them here to avoid dependencies
use URPM::Build;
use URPM::Resolve;
use URPM::Signature;

our @ISA = qw(DynaLoader);
our $VERSION = '2.05';

URPM->bootstrap($VERSION);

sub new {
    my ($class, %options) = @_;
    my $self = bless {
	depslist => [],
	provides => {},
	obsoletes => {},
    }, $class;
    $self->{nofatal} = 1 if $options{nofatal};
    $self;
}

sub set_nofatal { $_[0]{nofatal} = $_[1] }

sub packages_providing {
    my ($urpm, $name) = @_;
    map { $urpm->{depslist}[$_] } keys %{$urpm->{provides}{$name} || {}};
}

sub packages_obsoleting {
    my ($urpm, $name) = @_;
    map { $urpm->{depslist}[$_] } keys %{$urpm->{obsoletes}{$name} || {}};
}

sub packages_by_name {
    my ($urpm, $name) = @_;
    grep { $name eq $_->name } packages_providing($urpm, $name);
}

sub search {
    my ($urpm, $name, %options) = @_;
    my $best;

    #- tries other alternative if no strict searching.
    unless ($options{strict_name}) {
	if ($name =~ /^(.*)-([^\-]*)-([^\-]*)\.([^\.\-]*)$/) {
	    foreach my $pkg (packages_providing($urpm, $1)) {
		$pkg->fullname eq $name and return $pkg;
	    }
	}
	unless ($options{strict_fullname}) {
	    if ($name =~ /^(.*)-([^\-]*)-([^\-]*)$/) {
		foreach my $pkg (packages_providing($urpm, $1)) {
		    my ($n, $v, $r, $a) = $pkg->fullname;
		    $options{src} && $a eq 'src' || $pkg->is_arch_compat or next;
		    "$n-$v-$r" eq $name or next;
		    !$best || $pkg->compare_pkg($best) > 0 and $best = $pkg;
		}
		$best and return $best;
	    }
	    if ($name =~ /^(.*)-([^\-]*)$/) {
		foreach my $pkg (packages_providing($urpm, $1)) {
		    my ($n, $v, undef, $a) = $pkg->fullname;
		    $options{src} && $a eq 'src' || $pkg->is_arch_compat or next;
		    "$n-$v" eq $name or next;
		    !$best || $pkg->compare_pkg($best) > 0 and $best = $pkg;
		}
		$best and return $best;
	    }
	}
    }

    unless ($options{strict_fullname}) {
	foreach my $pkg (packages_providing($urpm, $name)) {
	    my ($n, undef, undef, $a) = $pkg->fullname;
	    $options{src} && $a eq 'src' || $pkg->is_arch_compat or next;
	    $n eq $name or next;
	    !$best || $pkg->compare_pkg($best) > 0 and $best = $pkg;
	}
    }

    return $best;
}

#- Olivier Thauvin:
#- Returns @$listid, $start .. $end or the whole deplist id
#- according to the given args
sub build_listid {
    my ($urpm, $start, $end, $listid) = @_;

    @{$listid || []} > 0 ? @$listid :
        (($start || 0) .. (defined($end) ? $end : $#{$urpm->{depslist}}));
}

sub traverse {
    my ($urpm, $callback) = @_;

    if ($callback) {
	foreach (@{$urpm->{depslist} || []}) {
	    $callback->($_);
	}
    }

    scalar @{$urpm->{depslist} || []};
}

sub traverse_tag {
    my ($urpm, $tag, $names, $callback) = @_;
    my $count = 0; 
    my %names;

    if (@{$names || []}) {
	if ($tag eq 'name') {
	    foreach my $n (@$names) {
		foreach my $p (packages_providing($urpm, $n)) {
		    $p->name eq $n or next;
		    $callback and $callback->($p);
		    ++$count;
		}
	    }
	} elsif ($tag eq 'whatprovides') {
	    foreach (@$names) {
		foreach (keys %{$urpm->{provides}{$_} || {}}) {
		    $callback and $callback->($urpm->{depslist}[$_]);
		    ++$count;
		}
	    }
	} else {
	    @names{@$names} = ();
	    if ($tag eq 'whatrequires') {
		foreach (@{$urpm->{depslist} || []}) {
		    if (grep { exists $names{$_} } $_->requires_nosense) {
			$callback and $callback->($_);
			++$count;
		    }
		}
	    } elsif ($tag eq 'whatconflicts') {
		foreach (@{$urpm->{depslist} || []}) {
		    if (grep { exists $names{$_} } $_->conflicts_nosense) {
			$callback and $callback->($_);
			++$count;
		    }
		}
	    } elsif ($tag eq 'group') {
		foreach (@{$urpm->{depslist} || []}) {
		    if (exists $names{$_->group}) {
			$callback and $callback->($_);
			++$count;
		    }
		}
	    } elsif ($tag eq 'triggeredby' || $tag eq 'path') {
		foreach (@{$urpm->{depslist} || []}) {
		    if (grep { exists $names{$_} } $_->files, grep { m!^/! } $_->provides_nosense) {
			$callback and $callback->($_);
			++$count;
		    }
		}
	    } else {
		die "unknown tag";
	    }
	}
    }

    $count;
}

sub parse_hdlist_or_synthesis {
    my ($parse_func, $urpm, $file, %options) = @_;

    my $previous_indice = @{$urpm->{depslist}};
    if (my ($start, $end) = $parse_func->($urpm, $file, %options)) {
	($start, $end);
    } elsif (!$options{callback}) {
	#- parse_hdlist__XS may have added some pkgs to {depslist},
	#- but we don't want those pkgs since reading hdlist failed later.
	#- so we need to drop them
	#- FIXME: {provides} would need to be reverted too!
	splice(@{$urpm->{depslist}}, $previous_indice);
	();
    } else {
	#- we need to keep them since the callback has been used
	#- and we can't pretend we didn't parse anything
	#- (needed for genhdlist2)
	();
    }
}
sub parse_synthesis { parse_hdlist_or_synthesis(\&parse_synthesis__XS, @_) }
sub parse_hdlist { parse_hdlist_or_synthesis(\&parse_hdlist__XS, @_) }

sub add_macro {
    my ($s) = @_;
    #- quote for rpmlib, *sigh*
    $s =~ s/\n/\\\n/g;
    add_macro_noexpand($s);
}

package URPM::Package;
our @ISA = qw(); # help perl_checker

#- debug help for urpmi
sub dump_flags {
    my ($pkg) = @_;
    <<EODUMP;
available:	  ${\($pkg->flag_available)}
base:		  ${\($pkg->flag_base)}
disable_obsolete: ${\($pkg->flag_disable_obsolete)}
installed:	  ${\($pkg->flag_installed)}
requested:	  ${\($pkg->flag_requested)}
required:	  ${\($pkg->flag_required)}
selected:	  ${\($pkg->flag_selected)}
skip:		  ${\($pkg->flag_skip)}
upgrade:	  ${\($pkg->flag_upgrade)}
EODUMP
}

my %arch_cache;
sub is_arch_compat {
    my ($pkg) = @_;
    my $arch = $pkg->arch;
    exists $arch_cache{$arch} and return $arch_cache{$arch};

    $arch_cache{$arch} = is_arch_compat__XS($pkg);
}

package URPM::Transaction;
our @ISA = qw(); # help perl_checker

package URPM::DB;
our @ISA = qw(); # help perl_checker

1;

__END__

=head1 NAME

URPM - Manipulate RPM files and headers

=head1 SYNOPSIS

    use URPM;

    # using the local RPM database
    my $db = URPM::DB::open();
    $db->traverse(sub {
	my ($package) = @_; # this is a URPM::Package object
	print $package->name, "\n";
	# ...
    });

    # loading and parsing a synthesis file
    my $urpm = new URPM;
    $urpm->parse_synthesis("synthesis.sample.cz");
    $urpm->traverse(sub {
	# retrieve all packages from the dependency list
	# ...
    });

=head1 DESCRIPTION

The URPM module allows you to manipulate RPM files, RPM header files and
hdlist files and manage them in memory. It is notably used by the C<urpmi>
utility. It provides four classes : C<URPM>, C<URPM::DB>, C<URPM::Package>,
and C<URPM::Transaction>.

=head2 The URPM class

=over 4

=item URPM->new()

The constructor creates a new, empty URPM object. It's a blessed hash that
contains two fields:

B<depslist> is an arrayref containing the list of depending packages (which are
C<URPM::Package> objects).

B<provides> is an hashref containing as keys the list of property names
provided by the URPM object. The associated value is true if the property is
versioned.

If the constructor is called with the arguments C<< nofatal => 1 >>, various
fatal error messages are suppressed (file not found in parse_hdlist() and
parse_synthesis()).

=item URPM::read_config_files()

Force the re-reading of the RPM configuration files.

=item URPM::list_rpm_tag()

Returns a hash containing the key/id values of known rpm tags.

=item URPM::ranges_overlap($range1, $range2 [, $nopromoteepoch])

This utility function compares two version ranges, in order to calculate
dependencies properly. The ranges have roughly the form

    [<|<=|==|=>|>] [epoch:]version[-release]

where epoch, version and release are RPM-style version numbers.

If the optional parameter $nopromoteepoch is true, and if the 2nd range has no
epoch while the first one has one, then the 2nd range is assumed to have an
epoch C<== 0>.

B<Warning>: $nopromoteepoch actually defaults to 1, so if you're going to
pass a variable, make sure undef is treated like 1, not 0.

=item $urpm->parse_synthesis($file [, callback => sub {...} ])

This method gets the B<depslist> and the B<provides> from a synthesis file
and adds them to the URPM object.

=item $urpm->parse_hdlist($file, %options)

This method loads rpm informations from rpm headers contained in an hdlist
file and adds them to the URPM object. Allowed options are 

    packing => 0 / 1
    callback => sub { ... }
    keep_all_tags => 0 / 1

The return value is a two-element array containing the first and the last id
parsed.

=item $urpm->parse_rpms($files, %options)

This method loads rpm informations from rpm headers and adds them to the URPM
object. The return value is a two-element array containing the first and the
last id parsed.

=item $urpm->parse_rpm($file, %options)

This method gets the B<depslist> and the B<provides> from an RPM file
and adds them to the URPM object. Allowed options are

    packing => 0 / 1
    keep_all_tags => 0 / 1
    callback => sub { ... }

If C<keep_all_tags> isn't specified, URPM will drop all memory-consuming tags
(notably changelogs, filelists, scriptlets).

=item $urpm->packages_providing($name)

Returns a list of C<URPM::Package> providing <$name>

=item $urpm->packages_by_name($name)

Returns a list of C<URPM::Package> corresponding to the wanted <$name>

=item $urpm->search($name, %options)

Search an RPM by name or by part of name in the list of RPMs represented by
this $urpm. The behaviour of the search is influenced by several options:

    strict_name => 0 / 1
    strict_fullname => 0 / 1
    src => 0 / 1

=item $urpm->traverse($callback)

Executes the callback for each package in the depslist, passing a
C<URPM::Package> object as argument the callback.

=item $urpm->traverse_tag($tag, $names, $callback)

$tag may be one of C<name>, C<whatprovides>, C<whatrequires>, C<whatconflicts>,
C<group>, C<triggeredby>, or C<path>.
$names is a reference to an array, holding the acceptable values of the said
tag for the searched variables.
Then, $callback is called for each matching package in the depslist.

=item URPM::verify_rpm($file, %options)

Verifies an RPM file.
Returns 0 on failure, 1 on success.
Recognized options are:

    nodigests => 0 / 1
    nosignatures => 0 / 1

=item URPM::verify_signature($file)

Verifies the signature of an RPM file. Returns a string that will contain "OK"
or "NOT OK" as well as a description of the found key (if successful) or of the
error (if signature verification failed.)

=item $urpm->import_pubkey(%options)

Imports a key in the RPM database.

    db => $urpm_db
    root => '...'
    block => '...'
    filename => '...'

=item URPM::spec2srcheader($specfile)

Returns a URPM::Package object containing the header of the source rpm produced
by the evaluation of the specfile whose path is given as argument. All
dependencies stored in this header are exactly the one needed to build the
specfile.

=back

=head2 The URPM::DB class

=over 4

=item open($prefix, $write_perm)

Returns a new C<URPM::DB> object pointing on the local RPM database (or
C<undef> on failure).

$prefix defaults to C<""> and indicates the RPM DB root directory prefix if
any. (See the B<--root> option to rpm(1)).

$write_perm is a boolean that defaults to false, and that indicates whether
the RPM DB should be open in read/write mode.

=item rebuild($prefix)

Rebuilds the RPM database (like C<rpm --rebuilddb>). $prefix defaults to C<"">.

=item $db->traverse($callback)

Executes the specified callback (a code reference) for each package
in the DB, passing a C<URPM::Package> object as argument the callback.

=item $db->traverse_tag($tag,$names,$callback)

$tag may be one of C<name>, C<whatprovides>, C<whatrequires>, C<whatconflicts>,
C<group>, C<triggeredby>, or C<path>.
$names is a reference to an array, holding the acceptable values of the said
tag for the searched variables.
Then, $callback is called for each matching package in the DB.

=item $db->create_transaction($prefix)

Creates and returns a new transaction (an C<URPM::Transaction> object) on the
specified DB. For $prefix, cf L<open>.

=back

=head2 The URPM::Package class

Most methods of C<URPM::Package> are accessors for the various properties
of an RPM package.

=over 4

=item $package->arch()

Gives the package architecture

=item $package->build_header($fileno)

Writes the rpm header to the specified file ($fileno being an integer).

=item $package->build_info($fileno, [$provides_files])

Writes a line of information in a synthesis file.

=item $package->buildarchs()

=item $package->buildhost()

=item $package->buildtime()

=item $package->changelog_name()

=item $package->changelog_text()

=item $package->changelog_time()

=item $package->compare($evr)

=item $package->compare_pkg($other_pkg)

=item $package->conf_files()

=item $package->conflicts()

=item $package->conflicts_nosense()

=item $package->description()

=item $package->distribution()

=item $package->epoch()

=item $package->excludearchs()

=item $package->exclusivearchs()

=item $package->filename()

The rpm's file name.

=item $package->files()

List of files in this rpm.

=item $package->files_flags()

=item $package->files_gid()

=item $package->files_group()

=item $package->files_md5sum()

=item $package->files_mode()

=item $package->files_mtime()

=item $package->files_owner()

=item $package->files_size()

=item $package->files_uid()

=item $package->flag($name)

=item $package->flag_available()

=item $package->flag_base()

=item $package->flag_disable_obsolete()

=item $package->flag_installed()

=item $package->flag_requested()

=item $package->flag_required()

=item $package->flag_selected()

=item $package->flag_skip()

=item $package->flag_upgrade()

=item $package->free_header()

=item $package->fullname()

Returns a 4 element list: name, version, release and architecture in an array
context. Returns a string NAME-VERSION-RELEASE.ARCH in scalar context.

=item $package->get_tag($tagid)

Returns an array containing values of $tagid. $tagid is the numerical value of
rpm tags. See rpmlib.h. 

=item $package->queryformat($format)

Querying the package like rpm --queryformat do. 

The function calls directly the rpmlib, then use header informations, so it 
silently failed if you use synthesis instead of hdlist/rpm/header files or rpmdb.

=item $package->get_tag_modifiers($tagid)

Return an array of human readable view of tag values. $tagid is the numerical value of rpm tags.

=item $package->group()

=item $package->header_filename()

=item $package->id()

=item $package->installtid()

=item $package->is_arch_compat()

Returns whether this package is compatible with the current machine's
architecture. 0 means not compatible. The lower the result is, the preferred
the package is.

=item $package->is_platform_compat()

Return whether this package is compatible with the current machine's
platform configuration (/etc/rpm/platform). 0 mean not compatible.
The lower the result is the preferred the package is.

=item $package->license()

=item $package->name()

The rpm's bare name.

=item $package->obsoletes()

=item $package->obsoletes_nosense()

=item $package->obsoletes_overlap($s, [$nopromoteepoch, [$direction] ])

=item $package->os()

=item $package->pack_header()

=item $package->packager()

=item $package->payload_format()

=item $package->provides()

=item $package->provides_nosense()

=item $package->provides_overlap($s, [$nopromoteepoch,] [$direction])

=item $package->rate()

=item $package->release()

=item $package->requires()

=item $package->requires_nosense()

=item $package->rflags()

=item $package->set_flag($name, $value)

=item $package->set_flag_base($value)

=item $package->set_flag_disable_obsolete($value)

=item $package->set_flag_installed($value)

=item $package->set_flag_requested($value)

=item $package->set_flag_required($value)

=item $package->set_flag_skip($value)

=item $package->set_flag_upgrade($value)

=item $package->set_id($id)

=item $package->set_rate($rate)

=item $package->set_rflags(...)

=item $package->size()

=item $package->sourcerpm()

=item $package->summary()

=item $package->update_header($filename, ...)

=item $package->upgrade_files()

=item $package->url()

=item $package->vendor()

=item $package->version()

=back

=head2 The URPM::Transaction class

=over 4

=item $trans->set_script_fd($fileno)

Sets the transaction output filehandle.

=item $trans->add($pkg, %options)

Adds a package to be installed to the transaction represented by $trans.
$pkg is an C<URPM::Package> object.

Options are:

    update => 0 / 1 : indicates whether this is an upgrade
    excludepath => [ ... ]

=item $trans->remove($name)

Adds a package to be erased to the transaction represented by $trans.
$name is the name of the package.

=item $trans->check(%options)

Checks that all dependencies can be resolved in this transaction.

Options are:

    translate_message => 0 / 1 (currently ignored.)

In list context, returns an array of problems (an empty array indicates
success).

=item $trans->order()

Determines package order in a transaction set according to dependencies. In
list context, returns an array of problems (an empty array indicates success).

=item $trans->run($data, %options)

Runs the transaction.

$data is an arbitrary user-provided piece of data to be passed to callbacks.

Recognized options are:

    callback_close  => sub { ... }
    callback_inst   => sub { ... }
    callback_open   => sub { ... }
    callback_trans  => sub { ... }
    callback_uninst => sub { ... }
    delta => used for progress callbacks (trans, uninst, inst)
    excludedocs => 0 / 1
    force => 0 / 1
    ignorearch => 0 / 1
    nosize => 0 / 1
    noscripts => 0 / 1
    oldpackage => 0 / 1
    repackage => 0 / 1
    test => 0 / 1
    translate_message => 1

They roughly correspond to command-line options to rpm(1).

=item $trans->traverse($callback)

Executes the specified callback (a code reference) for each package in the
transaction, passing a C<URPM::Package> object as argument the callback.

=back

=head2 Macro handling functions

=over

=item loadmacrosfile($filename)

Load the specified macro file. Sets $! if the file can't be read.

=item expand($name)

Expands the specified macro.

=item add_macro($macro_definition)

=item add_macro_noexpand($macro_definition)

Define a macro. For example,

    URPM::add_macro("vendor Mandriva");
    my $vendor = URPM::expand("%vendor");

The 'noexpand' version doesn't expand literal newline characters in the
macro definition.

=item del_macro($name)

Delete a macro.

=item resetmacros()

Destroys macros.

=item setVerbosity($level)

Sets rpm verbosity level. $level is an integer between 2 (RPMMESS_CRIT) and 7
(RPMMESS_DEBUG).

=item rpmErrorString()

=item rpmErrorWriteTo($fd)

=item platformscore($platform)

Return the score of $platform according computer's configuration.
0 mean not compatible, lower is prefered.

=item archscore($arch)

Return the score of the given arch. 0 mean not compatible,
lower is prefered.

=item osscore($os)

Return the score of the given os. 0 mean not compatible,
lower is prefered.

=back

=head2 The $state object

It has the following fields:

B<backtrack>: { 
   selected => { id => undef }, 
   deadlock => { id|property => undef },
 }

B<cached_installed>: { property_name => { fullname => undef } }

B<oldpackage>: int
   # will be passed to $trans->run to set RPMPROB_FILTER_OLDPACKAGE

B<selected>: { id => { 
     requested => bool, install => bool,
     from => pkg, psel => pkg,
     promote => name, unsatisfied => [ id|property ]
 } }

B<rejected>: { fullname => { 
     size => int, removed => bool, obsoleted => bool,
     backtrack => { # those info are only used to display why package is unselected
         promote => [ name ], keep => [ fullname ], 
         unsatisfied => [ id|property ], 
     },
     closure => { fullname => { old_requested => bool, 
                                unsatisfied => [ id|property ],
                                conflicts => property },
     },
 } }

B<whatrequires>: { name => { id => undef } }
   # reversed requires_nosense for selected packages

B<unselected_uninstalled>: [ pkg ]
   # (old) packages which are needed, but installed package is newer

more fields only used in build_transaction_set and its callers):

B<transaction>: [ { upgrade => [ id ], remove => [ fullname ] } ]

B<transaction_state>: $state object

=head1 COPYRIGHT

Copyright 2002, 2003, 2004, 2005 MandrakeSoft SA

Copyright 2005, 2006 Mandriva SA

Original author: FranE<ccedil>ois Pons.
Current maintainer: Rafael Garcia-Suarez
<rgarciasuarez@mandriva.com>

This library is free software; you can redistribute it and/or modify it under
the same terms as Perl itself.

=cut