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package URPM;
use strict;
#- resolve requested, keep resolution state to speed process.
#- a requested package is marked to be installed, once done, a upgrade flag or
#- installed flag is set according to needs of package.
#- other required package will have required flag set along with upgrade flag or
#- installed flag.
#- base flag should always been installed or upgraded.
#- the following options are recognized :
#- check : check requires of installed packages.
sub resolve_requested {
my ($urpm, $db, $state, %options) = @_;
my (@properties, %requested, $dep);
#- for each dep property evaluated, examine which package will be obsoleted on $db,
#- then examine provides that will be removed (which need to be satisfied by another
#- package present or by a new package to upgrade), then requires not satisfied and
#- finally conflicts that will force a new upgrade or a remove.
@properties = keys %{$state->{requested}};
@requested{map { split '\|', $_ } @properties} = ();
while (defined ($dep = shift @properties)) {
my ($allow_src, %packages, @chosen_requested, @chosen_upgrade, @chosen, %diff_provides, $pkg);
foreach (split '\|', $dep) {
if (/^\d+$/) {
my $pkg = $urpm->{depslist}[$_];
$allow_src = 1;
push @{$packages{$pkg->name}}, $pkg;
} elsif (my ($property, $name) = /^(([^\s\[]*).*)/) {
foreach (keys %{$urpm->{provides}{$name} || {}}) {
my $pkg = $urpm->{depslist}[$_];
my $satisfied = 0;
#- check if at least one provide of the package overlap the property.
foreach ($pkg->provides) {
ranges_overlap($property, $_) and ++$satisfied, last;
}
$satisfied and push @{$packages{$pkg->name}}, $pkg;
}
}
}
#- take the best package for each choices of same name.
foreach (values %packages) {
my $best;
foreach (@$_) {
if (defined $allow_src && $_->arch eq 'src' || $_->is_arch_compat) {
if ($best && $best != $_) {
$_->compare_pkg($best) > 0 and $best = $_;
} else {
$best = $_;
}
}
}
$_ = $best;
}
if (keys %packages > 1) {
#- package should be prefered if one of their provides is referenced
#- in requested hash or package itself is requested (or required).
#- if there is no preference choose the first one (higher probability
#- of being chosen) by default and ask user.
foreach my $pkg (values %packages) {
$pkg or next; #- this could happen if no package are suitable for this arch.
if (exists $requested{$pkg->id}) {
push @chosen_requested, $pkg;
} elsif ($db->traverse_tag('name', [ $pkg->name ], undef) > 0) {
push @chosen_upgrade, $pkg;
} else {
push @chosen, $pkg;
}
}
@chosen_requested > 0 and @chosen = @chosen_requested;
@chosen_requested == 0 and @chosen_upgrade > 0 and @chosen = @chosen_upgrade;
} else {
@chosen = values %packages;
}
if (@chosen > 1) {
#- solve choices by asking user.
print STDERR "asking user for ".scalar(@chosen)." choices\n";
#TODO
}
$pkg ||= $chosen[0];
$pkg && !$pkg->flag_requested && !$pkg->flag_required or next;
#- keep in mind the package has be selected.
$pkg->set_flag_requested(exists $requested{$dep});
$pkg->set_flag_required(! exists $requested{$dep});
#- check if package is not already installed before trying to use it, compute
#- obsoleted package too. this is valable only for non source package.
if ($pkg->arch ne 'src') {
$pkg->flag_installed and next;
unless ($pkg->flag_upgrade) {
$db->traverse_tag('name', [ $pkg->name ], sub {
my ($p) = @_;
$pkg->flag_installed or
$pkg->set_flag_installed($pkg->compare_pkg($p) <= 0);
});
$pkg->set_flag_upgrade(!$pkg->flag_installed);
}
$pkg->flag_installed and next;
#- keep in mind the provides of this package, so that future requires can be satisfied
#- with this package potentially.
foreach ($pkg->provides) {
$state->{provided}{$_}{$pkg->id} = undef;
}
foreach ($pkg->name, $pkg->obsoletes) {
if (my ($n, $o, $v) = /^([^\s\[]*)(?:\[\*\])?\[?([^\s\]]*)\s*([^\s\]]*)/) {
$db->traverse_tag('name', [ $n ], sub {
my ($p) = @_;
eval($p->compare($v) . $o . 0) or return;
$state->{obsoleted}{$p->fullname}{$pkg->id} = undef;
foreach ($p->provides) {
#- check if a installed property has been required which needs to be
#- re-evaluated to solve this one.
if (my $ip = $state->{installed}{$_}) {
if (exists $ip->{$p->fullname} && keys(%$ip) == 1) {
push @properties, $n;
delete $state->{installed}{$_};
} else {
delete $ip->{$p->fullname};
}
}
#- check differential provides between obsoleted package and newer one.
$state->{provided}{$_} or $diff_provides{$n} = undef;
}
});
}
}
foreach my $n (keys %diff_provides) {
$db->traverse_tag('whatrequires', [ $n ], sub {
my ($p) = @_;
my ($needed, $satisfied) = (0, 0);
foreach ($p->requires) {
if (my ($pn, $o, $v) = /^([^\[]*)(?:\[\*\])?\[?([^\s\]]*)\s*([^\s\]]*)/) {
if ($o) {
$pn eq $n && $pn eq $pkg->name or next;
++$needed;
eval($pkg->compare($v) . $o . 0) or next;
#- an existing provides (propably the one examined) is satisfying.
++$satisfied;
} else {
$pn eq $n && $pn ne $pkg->name or next;
#- a property has been removed since in diff_provides.
++$needed;
}
}
}
#- check if the package need to be updated because it
#- losts some of its requires regarding the current diff_provides.
if ($needed > $satisfied) {
push @properties, $p->name;
}
});
}
}
#- all requires should be satisfied according to selected package, or installed packages.
foreach ($pkg->requires) {
$state->{provided}{$_} || $state->{installed}{$_} and next;
#- keep track if satisfied.
my $satisfied = 0;
#- check on selected package if a provide is satisfying the resolution (need to do the ops).
foreach my $provide (keys %{$state->{provided}}) {
ranges_overlap($provide, $_) and ++$satisfied, last;
}
#- check on installed system a package which is not obsoleted is satisfying the require.
unless ($satisfied) {
if (my ($file) = /^(\/[^\s\[]*)/) {
$db->traverse_tag('path', [ $file ], sub {
my ($p) = @_;
exists $state->{obsoleted}{$p->fullname} and return;
++$satisfied;
});
} elsif (my ($property, $name) = /^(([^\s\[]*).*)/) {
$db->traverse_tag('whatprovides', [ $name ], sub {
my ($p) = @_;
exists $state->{obsoleted}{$p->fullname} and return;
foreach ($p->provides) {
$state->{installed}{$_}{$p->fullname} = undef;
ranges_overlap($_, $property) and ++$satisfied, return;
}
});
}
}
#- if nothing can be done, the require should be resolved.
$satisfied or push @properties, $_;
}
#- examine conflicts.
#TODO
}
}
1;
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