#!/usr/bin/perl
#
# Abort the current build.
# Copyright © 1998 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de>
# Copyright © 2003 Ryan Murray <rmurray@debian.org>
# Copyright © 2008 Roger Leigh <rleigh@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, see
# <http://www.gnu.org/licenses/>.
#
#######################################################################

use strict;
use warnings;

use Getopt::Long;
use Sbuild qw(help_text version_text usage_error check_group_membership);
use Sbuild::Conf qw();
use Sbuild::OptionsBase;

my $conf = Sbuild::Conf::new();
exit 1 if !defined($conf);
my $options = Sbuild::OptionsBase->new($conf, "sbuild-abort", "1");
exit 1 if !defined($options);
check_group_membership();

my $buildcount = 0;
my $linecount = 0;
my $header = "";
my @detail = ();

open (PIPE, "/bin/ps xjww |") or die "Can't run /bin/ps: $!\n";
while(<PIPE>) {
    chomp;
    if ($linecount == 0) {
	$header = $_;
    } elsif (m/\/usr\/bin\/perl \/usr\/bin\/dpkg-buildpackage/) {
	push @detail, $_;
	$buildcount++;
    }
    $linecount++;
}
close (PIPE) or die "Can't close /bin/ps pipe: $!\n";

if ($buildcount == 0) {
    print STDERR "E: No dpkg-buildpackage process found\n";
    exit 1;
} elsif ($buildcount > 1) {
    print STDERR "E: More than one dpkg-buildpackage process found:\n";

    print "I: $header\n";
    foreach (@detail) {
	print "I: $_\n";
    }
    exit 1;
}

# Get PGID from saved ps output.
my @fields = split(/[[:space:]]+/, $detail[0]);
die "Error parsing /bin/ps output" if (@fields < 1);
my $pgid = $fields[2];

# Kill process group.
print "I: Killing process group $pgid\n";
kill("TERM", -$pgid) or die "Error killing PGID $pgid: $!\n";

exit 0;