/usr/share/backuppc/lib/BackupPC/Xfer/Tar.pm is in backuppc 3.3.1-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# BackupPC::Xfer::Tar package
#
# DESCRIPTION
#
# This library defines a BackupPC::Xfer::Tar class for managing
# the tar-based transport of backup data from the client.
#
# AUTHOR
# Craig Barratt <cbarratt@users.sourceforge.net>
#
# COPYRIGHT
# Copyright (C) 2001-2015 Craig Barratt
#
# 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
#========================================================================
#
# Version 3.3.1, released 11 Jan 2015.
#
# See http://backuppc.sourceforge.net.
#
#========================================================================
package BackupPC::Xfer::Tar;
use strict;
use Encode qw/from_to encode/;
use base qw(BackupPC::Xfer::Protocol);
sub useTar
{
return 1;
}
sub start
{
my($t) = @_;
my $bpc = $t->{bpc};
my $conf = $t->{conf};
my(@fileList, $tarClientCmd, $logMsg, $incrDate);
local(*TAR);
if ( $t->{type} eq "restore" ) {
$tarClientCmd = $conf->{TarClientRestoreCmd};
$logMsg = "restore started below directory $t->{shareName}";
#
# restores are considered to work unless we see they fail
# (opposite to backups...)
#
$t->{xferOK} = 1;
} else {
#
# Turn $conf->{BackupFilesOnly} and $conf->{BackupFilesExclude}
# into a hash of arrays of files, and $conf->{TarShareName}
# to an array
#
$bpc->backupFileConfFix($conf, "TarShareName");
if ( defined($conf->{BackupFilesExclude}{$t->{shareName}}) ) {
foreach my $file2 ( @{$conf->{BackupFilesExclude}{$t->{shareName}}} ) {
my $file = $file2;
$file = "./$2" if ( $file =~ m{^(\./+|/+)(.*)}s );
$file = encode($conf->{ClientCharset}, $file)
if ( $conf->{ClientCharset} ne "" );
push(@fileList, "--exclude=$file");
}
}
if ( defined($conf->{BackupFilesOnly}{$t->{shareName}}) ) {
foreach my $file2 ( @{$conf->{BackupFilesOnly}{$t->{shareName}}} ) {
my $file = $file2;
$file = $2 if ( $file =~ m{^(\./+|/+)(.*)}s );
$file = "./$file";
$file = encode($conf->{ClientCharset}, $file)
if ( $conf->{ClientCharset} ne "" );
push(@fileList, $file);
}
} else {
push(@fileList, ".");
}
if ( ref($conf->{TarClientCmd}) eq "ARRAY" ) {
$tarClientCmd = $conf->{TarClientCmd};
} else {
$tarClientCmd = [split(/ +/, $conf->{TarClientCmd})];
}
my $args;
if ( $t->{type} eq "full" ) {
$args = $conf->{TarFullArgs};
$logMsg = "full backup started for directory $t->{shareName}";
} else {
$incrDate = $bpc->timeStamp($t->{incrBaseTime} - 3600, 1);
$args = $conf->{TarIncrArgs};
$logMsg = "incr backup started back to $incrDate"
. " (backup #$t->{incrBaseBkupNum}) for directory"
. " $t->{shareName}";
}
push(@$tarClientCmd, split(/ +/, $args));
}
#
# Merge variables into @tarClientCmd
#
my $args = {
host => $t->{host},
hostIP => $t->{hostIP},
client => $t->{client},
incrDate => $incrDate,
shareName => $t->{shareName},
fileList => \@fileList,
tarPath => $conf->{TarClientPath},
sshPath => $conf->{SshPath},
};
from_to($args->{shareName}, "utf8", $conf->{ClientCharset})
if ( $conf->{ClientCharset} ne "" );
$tarClientCmd = $bpc->cmdVarSubstitute($tarClientCmd, $args);
if ( !defined($t->{xferPid} = open(TAR, "-|")) ) {
$t->{_errStr} = "Can't fork to run tar";
return;
}
$t->{pipeTar} = *TAR;
if ( !$t->{xferPid} ) {
#
# This is the tar child.
#
setpgrp 0,0;
if ( $t->{type} eq "restore" ) {
#
# For restores, close the write end of the pipe,
# clone STDIN to RH
#
close($t->{pipeWH});
close(STDERR);
open(STDERR, ">&STDOUT");
close(STDIN);
open(STDIN, "<&$t->{pipeRH}");
} else {
#
# For backups, close the read end of the pipe,
# clone STDOUT to WH, and STDERR to STDOUT
#
close($t->{pipeRH});
close(STDERR);
open(STDERR, ">&STDOUT");
open(STDOUT, ">&$t->{pipeWH}");
}
#
# Run the tar command
#
alarm(0);
$bpc->cmdExecOrEval($tarClientCmd, $args);
# should not be reached, but just in case...
$t->{_errStr} = "Can't exec @$tarClientCmd";
return;
}
my $str = "Running: " . $bpc->execCmd2ShellCmd(@$tarClientCmd) . "\n";
from_to($str, $conf->{ClientCharset}, "utf8")
if ( $conf->{ClientCharset} ne "" );
$t->{XferLOG}->write(\"Running: @$tarClientCmd\n");
alarm($conf->{ClientTimeout});
$t->{_errStr} = undef;
return $logMsg;
}
sub readOutput
{
my($t, $FDreadRef, $rout) = @_;
my $conf = $t->{conf};
if ( vec($rout, fileno($t->{pipeTar}), 1) ) {
my $mesg;
if ( sysread($t->{pipeTar}, $mesg, 8192) <= 0 ) {
vec($$FDreadRef, fileno($t->{pipeTar}), 1) = 0;
if ( !close($t->{pipeTar}) && $? != 256 ) {
#
# Tar 1.16 uses exit status 1 (256) when some files
# changed during archive creation. We allow this
# as a benign error and consider the archive ok
#
$t->{tarOut} .= "Tar exited with error $? ($!) status\n";
$t->{xferOK} = 0 if ( !$t->{tarBadExitOk} );
}
} else {
$t->{tarOut} .= $mesg;
}
}
my $logFileThres = $t->{type} eq "restore" ? 1 : 2;
while ( $t->{tarOut} =~ /(.*?)[\n\r]+(.*)/s ) {
$_ = $1;
$t->{tarOut} = $2;
from_to($_, $conf->{ClientCharset}, "utf8")
if ( $conf->{ClientCharset} ne "" );
#
# refresh our inactivity alarm
#
alarm($conf->{ClientTimeout}) if ( !$t->{abort} );
$t->{lastOutputLine} = $_ if ( !/^$/ );
if ( /^Total bytes (written|read): / ) {
$t->{XferLOG}->write(\"$_\n") if ( $t->{logLevel} >= 1 );
$t->{xferOK} = 1;
} elsif ( /^\./ ) {
$t->{XferLOG}->write(\"$_\n") if ( $t->{logLevel} >= $logFileThres );
$t->{fileCnt}++;
} else {
#
# Ignore annoying log message on incremental for tar 1.15.x
#
if ( !/: file is unchanged; not dumped$/ && !/: socket ignored$/ ) {
$t->{XferLOG}->write(\"$_\n") if ( $t->{logLevel} >= 0 );
$t->{xferErrCnt}++;
}
#
# If tar encounters a minor error, it will exit with a non-zero
# status. We still consider that ok. Remember if tar prints
# this message indicating a non-fatal error.
#
$t->{tarBadExitOk} = 1
if ( $t->{xferOK} && /Error exit delayed from previous / );
#
# Also remember files that had read errors
#
if ( /: \.\/(.*): Read error at byte / ) {
my $badFile = $1;
push(@{$t->{badFiles}}, {
share => $t->{shareName},
file => $badFile
});
}
}
}
return 1;
}
sub setSelectMask
{
my($t, $FDreadRef) = @_;
vec($$FDreadRef, fileno($t->{pipeTar}), 1) = 1;
}
1;
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