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#!/usr/bin/env perl
## Copyright © 2008-2009 by Daniel Friesel <derf@derf.homelinux.org>
## License: WTFPL <http://sam.zoy.org/wtfpl>
use strict;
use warnings;
use 5.010;
use AptPkg::Cache;
use Getopt::Long;
my $cache = AptPkg::Cache->new;
my $max_depth = 5;
my $all = 0;
my $tabsign = "\t";
my @deptypes = qw/Depends Recommends Suggests/;
my @known;
sub usage {
exec('perldoc', '-F', $0) or die("See perldoc -F $0");
}
sub revdeps {
my $name = shift;
my $package = $cache->{$name};
my @return;
my $rdeps = $package->{RevDependsList};
foreach my $dependency (@{$rdeps}) {
if (
not $dependency->{ParentPkg}{Name} ~~ @known
and ($all or $cache->{$dependency->{ParentPkg}{Name}}->{CurrentState} eq 'Installed')
and "$dependency->{DepType}" ~~ @deptypes
) {
push(@return, $dependency->{ParentPkg}{Name});
}
}
push(@known, @return);
return(@return);
}
sub recurse {
my $name = shift;
my $depth = (shift) + 1;
printf("%s%s\n", $tabsign x ($depth-1), $name);
if ($depth >= $max_depth) {
return;
}
foreach (revdeps($name)) {
recurse($_, $depth);
}
return;
}
GetOptions(
'all!' => \$all,
'deptype=s' => sub { @deptypes = split(/,/, $_[1]) },
'depth=i' => \$max_depth,
'tabwidth=i' => sub { $tabsign = ' ' x $_[1] },
'h|?|help' => \&usage,
);
my $packagename = shift or die("Usage: $0 [options] <package>; see $0 --help\n");
if (not defined $cache->{$packagename}) {
die("No such package: $packagename\n");
}
if ($cache->{$packagename}->{Flags} =~ /Essential/) {
print "Essential: Yes\n";
}
recurse($packagename, 0);
__END__
=head1 NAME
apt-why - filtered reverse dependency displayer using AptPkg::Cache
=head1 SYNOPSIS
B<apt-why> [ I<options> ] I<package>
=head1 DESCRIPTION
B<apt-why> recursively displays I<package>'s reverse dependency, thus
showing which installed packages require I<package> on the system.
=head1 OPTIONS
=over
=item B<--all>
Consider all packages, not just installed ones
=item B<--depth>=I<integer> (default: 5)
Specify the maximum recursion depth
=item B<--deptype>=I<types>
Only show reverse dependency which mach the specified I<types> (comma separated list).
Right now, possible types are Depends, Suggests, Recommends.
=item B<--tabwidth>=I<i>
Indent each recursion level with I<i> spaces (by default: one tab)
=back
=head1 AUTHOR
Daniel Friesel E<lt>derf@derf.homelinux.orgE<gt>
=head1 LICENSE
0. You just DO WHAT THE FUCK YOU WANT TO.
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