#! /usr/bin/perl

# rdebsums: a wrapper around debsums to also check dependencies of a package
# Copyright 2007 by Vincent Fourmond <fourmond@debian.org>
#
# This program 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 2 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
# 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 St, Fifth Floor, Boston, MA  02110-1301 USA

my $usage="rdebsums --help | --others [debsum options] package

Runs debsums on package and all its dependencies.
\t--others\talso include Recommends and Suggests
";



if(grep(/^--others/, @ARGV)) {
    print "Also running debsums on suggests and recommends\n";
    $others = 1;
    @ARGV = grep(!/^--others/, @ARGV)
} else {
    $others = 0;
}
if(! (scalar @ARGV) || grep(/^--help/, @ARGV) ) {
    print $usage;
    exit 1;
}

my $pack = pop;
my $options = join(" ", @ARGV);
my $overall_rc = 0;

for my $p (dependencies($pack, $others)) {
    print "\nRunning debsums $options $p:\n";
    my $rc = system "debsums $options $p";
    $overall_rc = max($overall_rc, $rc);
}

if ($overall_rc > 0) {
    exit $overall_rc >> 8;
} else {
    exit 0;
}

# Gets all the installed dependencies of a package, including
# recommends and suggests if the second argument is true.
sub dependencies {
    my $pack = shift;
    my $also_not_depends = shift || 0;
    my $ignore = shift || {};

    # We first sanitize $pack:
    if($pack =~ /([a-z0-9+.-]+)/) {
        $pack = $1;
    } else {
        return ();
    }
    # We first get direct children:
    my @direct_children;
    my $dpkg_query_cmd = "dpkg-query -W -f '\${Depends}".
        ($also_not_depends ? ' ${Recommends} ${Suggests}' : "").
        "' $pack 2> /dev/null";
    my $dpkg_query = `$dpkg_query_cmd`;
    while($dpkg_query =~ /\([^)]+\)|([a-z0-9+.-]+)/g) {
        if($1) {
            push @direct_children, $1;
        }
    }

    $ignore->{$pack} = 1;
    # Then, we add their dependencies
    for my $subp (@direct_children) {
        dependencies($subp, $also_not_depends, $ignore) unless
            $ignore->{$subp};
        $ignore{$subp} = 1;
    }
    return (keys %{$ignore});
}

sub max {
    my ($a, $b) = @_;
    return($a > $b ? $a : $b);
}