/usr/share/perl5/Sbuild/LogBase.pm is in libsbuild-perl 0.75.0-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# LogBase.pm: logging library (base functionality) for sbuild
# Copyright © 2005 Ryan Murray <rmurray@debian.org>
# Copyright © 2005-2009 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/>.
#
#######################################################################
package Sbuild::LogBase;
use strict;
use warnings;
use English;
sub open_log ($$$);
sub close_log ($);
our $log = undef;
our $saved_stdout = undef;
our $saved_stderr = undef;
BEGIN {
use Exporter ();
our (@ISA, @EXPORT_OK);
@ISA = qw(Exporter);
@EXPORT_OK = qw(open_log close_log $log $saved_stdout $saved_stderr);
}
sub open_log ($$$) {
my $conf = shift;
my $log_file = shift; # File to log to
my $logfunc = shift; # Function to handle logging
if (!defined($logfunc)) {
$logfunc = sub {
my $log_file = shift;
my $message = shift;
print $log_file $message;
}
}
$log_file->autoflush(1) if defined($log_file);
my $pid;
($pid = open($log, "|-"));
if (!defined $pid) {
warn "Cannot open pipe to log: $!\n";
}
elsif ($pid == 0) {
# We ignore SIG(INT|QUIT|TERM) because they will be caught in
# the parent which will subsequently close the logging stream
# resulting in our termination. This is needed to ensure the
# final log messages are sent and the parent doesn't die with
# SIGPIPE.
$SIG{'INT'} = 'IGNORE';
$SIG{'QUIT'} = 'IGNORE';
$SIG{'TERM'} = 'IGNORE';
$PROGRAM_NAME = 'main log for ' . $PROGRAM_NAME;
while (<STDIN>) {
$logfunc->($log_file, $_)
if (!$conf->get('NOLOG') && defined($log_file));
$logfunc->(\*STDOUT, $_)
if ($conf->get('VERBOSE'));
}
undef $log_file;
exit 0;
}
undef $log_file; # Close in parent
$log->autoflush(1); # Automatically flush
select($log); # It's the default stream
open($saved_stdout, ">&STDOUT") or warn "Can't redirect stdout\n";
open($saved_stderr, ">&STDERR") or warn "Can't redirect stderr\n";
open(STDOUT, '>&', $log) or warn "Can't redirect stdout\n";
open(STDERR, '>&', $log) or warn "Can't redirect stderr\n";
return $log;
}
sub close_log ($) {
my $conf = shift;
# Note: It's imperative to close and reopen in the exact order in
# which we originally opened and reopened, or else we can deadlock
# in wait4 when closing the log stream due to waiting on the child
# forever.
open(STDERR, '>&', $saved_stderr) or warn "Can't redirect stderr\n"
if defined($saved_stderr);
open(STDOUT, '>&', $saved_stdout) or warn "Can't redirect stdout\n"
if defined($saved_stdout);
$saved_stderr->close();
undef $saved_stderr;
$saved_stdout->close();
undef $saved_stdout;
$log->close();
undef $log;
}
1;
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