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dpavlin |
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#============================================================= -*-perl-*- |
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# |
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# BackupPC::Xfer::Tar package |
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# |
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# DESCRIPTION |
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# |
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# This library defines a BackupPC::Xfer::Tar class for managing |
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# the tar-based transport of backup data from the client. |
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# |
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# AUTHOR |
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# Craig Barratt <cbarratt@users.sourceforge.net> |
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# |
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# COPYRIGHT |
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# Copyright (C) 2001-2003 Craig Barratt |
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# |
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# This program is free software; you can redistribute it and/or modify |
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# it under the terms of the GNU General Public License as published by |
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# the Free Software Foundation; either version 2 of the License, or |
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# (at your option) any later version. |
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# |
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# This program is distributed in the hope that it will be useful, |
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# but WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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# GNU General Public License for more details. |
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# |
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# You should have received a copy of the GNU General Public License |
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# along with this program; if not, write to the Free Software |
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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# |
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#======================================================================== |
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# |
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dpavlin |
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# Version 2.1.2, released 5 Sep 2005. |
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dpavlin |
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# |
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# See http://backuppc.sourceforge.net. |
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# |
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#======================================================================== |
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package BackupPC::Xfer::Tar; |
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use strict; |
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sub new |
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{ |
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my($class, $bpc, $args) = @_; |
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$args ||= {}; |
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my $t = bless { |
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bpc => $bpc, |
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conf => { $bpc->Conf }, |
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host => "", |
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hostIP => "", |
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shareName => "", |
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pipeRH => undef, |
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pipeWH => undef, |
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badFiles => [], |
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%$args, |
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}, $class; |
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return $t; |
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} |
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sub args |
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{ |
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my($t, $args) = @_; |
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foreach my $arg ( keys(%$args) ) { |
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$t->{$arg} = $args->{$arg}; |
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} |
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} |
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sub useTar |
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{ |
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return 1; |
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} |
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sub start |
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{ |
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my($t) = @_; |
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my $bpc = $t->{bpc}; |
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my $conf = $t->{conf}; |
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my(@fileList, $tarClientCmd, $logMsg, $incrDate); |
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local(*TAR); |
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if ( $t->{type} eq "restore" ) { |
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$tarClientCmd = $conf->{TarClientRestoreCmd}; |
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$logMsg = "restore started below directory $t->{shareName}"; |
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# |
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# restores are considered to work unless we see they fail |
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# (opposite to backups...) |
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# |
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$t->{xferOK} = 1; |
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} else { |
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# |
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# Turn $conf->{BackupFilesOnly} and $conf->{BackupFilesExclude} |
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# into a hash of arrays of files, and $conf->{TarShareName} |
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# to an array |
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# |
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$bpc->backupFileConfFix($conf, "TarShareName"); |
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if ( defined($conf->{BackupFilesExclude}{$t->{shareName}}) ) { |
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foreach my $file ( @{$conf->{BackupFilesExclude}{$t->{shareName}}} ) |
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{ |
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$file = ".$file" if ( $file =~ /^\// ); |
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push(@fileList, "--exclude=$file"); |
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} |
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} |
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if ( defined($conf->{BackupFilesOnly}{$t->{shareName}}) ) { |
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foreach my $file ( @{$conf->{BackupFilesOnly}{$t->{shareName}}} ) { |
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$file = ".$file" if ( $file =~ /^\// ); |
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push(@fileList, $file); |
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} |
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} else { |
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push(@fileList, "."); |
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} |
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if ( ref($conf->{TarClientCmd}) eq "ARRAY" ) { |
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$tarClientCmd = $conf->{TarClientCmd}; |
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} else { |
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$tarClientCmd = [split(/ +/, $conf->{TarClientCmd})]; |
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} |
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my $args; |
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if ( $t->{type} eq "full" ) { |
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$args = $conf->{TarFullArgs}; |
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$logMsg = "full backup started for directory $t->{shareName}"; |
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} else { |
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$incrDate = $bpc->timeStamp($t->{lastFull} - 3600, 1); |
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$args = $conf->{TarIncrArgs}; |
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$logMsg = "incr backup started back to $incrDate for directory" |
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. " $t->{shareName}"; |
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} |
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push(@$tarClientCmd, split(/ +/, $args)); |
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} |
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# |
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# Merge variables into @tarClientCmd |
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# |
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my $args = { |
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host => $t->{host}, |
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hostIP => $t->{hostIP}, |
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client => $t->{client}, |
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incrDate => $incrDate, |
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shareName => $t->{shareName}, |
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fileList => \@fileList, |
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tarPath => $conf->{TarClientPath}, |
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sshPath => $conf->{SshPath}, |
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}; |
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$tarClientCmd = $bpc->cmdVarSubstitute($tarClientCmd, $args); |
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if ( !defined($t->{xferPid} = open(TAR, "-|")) ) { |
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$t->{_errStr} = "Can't fork to run tar"; |
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return; |
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} |
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$t->{pipeTar} = *TAR; |
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if ( !$t->{xferPid} ) { |
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# |
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# This is the tar child. |
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# |
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setpgrp 0,0; |
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if ( $t->{type} eq "restore" ) { |
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# |
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# For restores, close the write end of the pipe, |
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# clone STDIN to RH |
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# |
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close($t->{pipeWH}); |
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close(STDERR); |
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open(STDERR, ">&STDOUT"); |
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close(STDIN); |
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open(STDIN, "<&$t->{pipeRH}"); |
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} else { |
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# |
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# For backups, close the read end of the pipe, |
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# clone STDOUT to WH, and STDERR to STDOUT |
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# |
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close($t->{pipeRH}); |
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close(STDERR); |
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open(STDERR, ">&STDOUT"); |
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open(STDOUT, ">&$t->{pipeWH}"); |
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} |
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# |
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# Run the tar command |
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# |
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alarm(0); |
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$bpc->cmdExecOrEval($tarClientCmd, $args); |
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# should not be reached, but just in case... |
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$t->{_errStr} = "Can't exec @$tarClientCmd"; |
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return; |
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} |
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my $str = "Running: " . $bpc->execCmd2ShellCmd(@$tarClientCmd) . "\n"; |
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$t->{XferLOG}->write(\"Running: @$tarClientCmd\n"); |
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alarm($conf->{ClientTimeout}); |
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$t->{_errStr} = undef; |
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return $logMsg; |
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} |
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sub readOutput |
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{ |
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my($t, $FDreadRef, $rout) = @_; |
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my $conf = $t->{conf}; |
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if ( vec($rout, fileno($t->{pipeTar}), 1) ) { |
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my $mesg; |
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if ( sysread($t->{pipeTar}, $mesg, 8192) <= 0 ) { |
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vec($$FDreadRef, fileno($t->{pipeTar}), 1) = 0; |
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if ( !close($t->{pipeTar}) ) { |
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$t->{tarOut} .= "Tar exited with error $? ($!) status\n"; |
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$t->{xferOK} = 0 if ( !$t->{tarBadExitOk} ); |
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} |
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} else { |
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$t->{tarOut} .= $mesg; |
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} |
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} |
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while ( $t->{tarOut} =~ /(.*?)[\n\r]+(.*)/s ) { |
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$_ = $1; |
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$t->{tarOut} = $2; |
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# |
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# refresh our inactivity alarm |
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# |
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alarm($conf->{ClientTimeout}) if ( !$t->{abort} ); |
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$t->{lastOutputLine} = $_ if ( !/^$/ ); |
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if ( /^Total bytes written: / ) { |
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$t->{XferLOG}->write(\"$_\n") if ( $t->{logLevel} >= 1 ); |
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$t->{xferOK} = 1; |
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} elsif ( /^\./ ) { |
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$t->{XferLOG}->write(\"$_\n") if ( $t->{logLevel} >= 2 ); |
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$t->{fileCnt}++; |
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} else { |
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$t->{XferLOG}->write(\"$_\n") if ( $t->{logLevel} >= 0 ); |
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$t->{xferErrCnt}++; |
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# |
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# If tar encounters a minor error, it will exit with a non-zero |
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# status. We still consider that ok. Remember if tar prints |
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# this message indicating a non-fatal error. |
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# |
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$t->{tarBadExitOk} = 1 |
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if ( $t->{xferOK} && /Error exit delayed from previous / ); |
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# |
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# Also remember files that had read errors |
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# |
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if ( /: \.\/(.*): Read error at byte / ) { |
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my $badFile = $1; |
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push(@{$t->{badFiles}}, { |
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share => $t->{shareName}, |
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file => $badFile |
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}); |
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} |
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} |
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} |
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return 1; |
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} |
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sub abort |
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{ |
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my($t, $reason) = @_; |
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my @xferPid = $t->xferPid; |
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$t->{abort} = 1; |
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$t->{abortReason} = $reason; |
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if ( @xferPid ) { |
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kill($t->{bpc}->sigName2num("INT"), @xferPid); |
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} |
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} |
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sub setSelectMask |
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{ |
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my($t, $FDreadRef) = @_; |
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vec($$FDreadRef, fileno($t->{pipeTar}), 1) = 1; |
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} |
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sub errStr |
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{ |
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my($t) = @_; |
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return $t->{_errStr}; |
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} |
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sub xferPid |
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{ |
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my($t) = @_; |
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return ($t->{xferPid}); |
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} |
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sub logMsg |
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{ |
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my($t, $msg) = @_; |
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push(@{$t->{_logMsg}}, $msg); |
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} |
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sub logMsgGet |
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{ |
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my($t) = @_; |
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return shift(@{$t->{_logMsg}}); |
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} |
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# |
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# Returns a hash ref giving various status information about |
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# the transfer. |
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# |
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sub getStats |
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{ |
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my($t) = @_; |
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return { map { $_ => $t->{$_} } |
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qw(byteCnt fileCnt xferErrCnt xferBadShareCnt xferBadFileCnt |
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xferOK hostAbort hostError lastOutputLine) |
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}; |
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} |
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sub getBadFiles |
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{ |
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my($t) = @_; |
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return @{$t->{badFiles}}; |
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} |
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1; |
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