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#!/bin/perl
#============================================================= -*-perl-*-
#
# BackupPC_link: link new backup into pool
#
# DESCRIPTION
#
# BackupPC_link inspects every file in a new backup and
# checks if an existing file from any previous backup is
# identical. If so, the file is removed and replaced by
# a hardlink to the existing file. If the file is new,
# a hardlink to the file is made in the pool area, so that
# this file is available for checking against future backups.
#
# Then, for incremental backups, hardlinks are made in the
# backup directories to all files that were not extracted during
# the incremental backups. The means the incremental dump looks
# like a complete image of the PC.
#
# AUTHOR
# Craig Barratt <cbarratt@users.sourceforge.net>
#
# COPYRIGHT
# Copyright (C) 2001-2003 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 2.1.1, released 13 Mar 2005.
#
# See http://backuppc.sourceforge.net.
#
#========================================================================
use strict;
no utf8;
use lib "__INSTALLDIR__/lib";
use BackupPC::Lib;
use BackupPC::Attrib;
use BackupPC::PoolWrite;
use File::Find;
use File::Path;
use Digest::MD5;
###########################################################################
# Initialize
###########################################################################
die("BackupPC::Lib->new failed\n") if ( !(my $bpc = BackupPC::Lib->new) );
my $TopDir = $bpc->TopDir();
my $BinDir = $bpc->BinDir();
my %Conf = $bpc->Conf();
$bpc->ChildInit();
if ( @ARGV != 1 ) {
print("usage: $0 <host>\n");
exit(1);
}
if ( $ARGV[0] !~ /^([\w\.\s-]+)$/ ) {
print("$0: bad host name '$ARGV[0]'\n");
exit(1);
}
my $host = $1;
my $Dir = "$TopDir/pc/$host";
my($CurrDumpDir, $Compress);
#
# Re-read config file, so we can include the PC-specific config
#
$bpc->ConfigRead($host);
%Conf = $bpc->Conf();
###########################################################################
# Process any backups that haven't been linked
###########################################################################
my $md5 = Digest::MD5->new;
my($nFilesNew, $sizeNew, $sizeNewComp);
my($nFilesExist, $sizeExist, $sizeExistComp);
while ( 1 ) {
my @Backups = $bpc->BackupInfoRead($host);
$nFilesNew = $sizeNew = $sizeNewComp = 0;
$nFilesExist = $sizeExist = $sizeExistComp = 0;
my($num);
for ( $num = 0 ; $num < @Backups ; $num++ ) {
last if ( $Backups[$num]{nFilesNew} eq ""
|| -f "$Dir/NewFileList.$Backups[$num]{num}" );
}
last if ( $num >= @Backups );
#
# Process list of new files left by BackupPC_dump
#
$CurrDumpDir = "$Dir/$Backups[$num]{num}";
$Compress = $Backups[$num]{compress};
if ( open(NEW, "<", "$Dir/NewFileList.$Backups[$num]{num}") ) {
binmode(NEW);
while ( <NEW> ) {
chomp;
next if ( !/(\w+) (\d+) (.*)/ );
LinkNewFile($1, $2, "$CurrDumpDir/$3");
}
close(NEW);
}
unlink("$Dir/NewFileList.$Backups[$num]{num}")
if ( -f "$Dir/NewFileList.$Backups[$num]{num}" );
#
# See if we should fill in this dump. We only need to fill
# in incremental dumps. We can only fill in the incremental
# dump if there is an existing filled in dump with the same
# type of compression (on or off). Eg, we can't fill in
# a compressed incremental if the most recent filled in dump
# is not compressed.
#
my $noFill = 1;
my $fillFromNum;
if ( $Backups[$num]{type} ne "incr" ) {
$noFill = 0
} elsif ( $Conf{IncrFill} ) {
my $i;
for ( $i = $num - 1 ; $i >= 0 ; $i-- ) {
last if ( !$Backups[$i]{noFill}
&& ($Backups[$i]{compress} ? 1 : 0)
== ($Compress ? 1 : 0) );
}
my $prevDump = "$Dir/$Backups[$i]{num}";
if ( $i >= 0 && -d $prevDump ) {
find({wanted => \&FillIncr, no_chdir => 1}, $prevDump);
$noFill = 0;
$fillFromNum = $Backups[$i]{num};
}
}
#
# Update the backup info file in $TopDir/pc/$host/backups
#
@Backups = $bpc->BackupInfoRead($host);
$Backups[$num]{nFilesExist} += $nFilesExist;
$Backups[$num]{sizeExist} += $sizeExist;
$Backups[$num]{sizeExistComp} += $sizeExistComp;
$Backups[$num]{nFilesNew} += $nFilesNew;
$Backups[$num]{sizeNew} += $sizeNew;
$Backups[$num]{sizeNewComp} += $sizeNewComp;
$Backups[$num]{noFill} = $noFill;
$Backups[$num]{fillFromNum} = $fillFromNum;
$bpc->BackupInfoWrite($host, @Backups);
}
###########################################################################
# Subroutines
###########################################################################
#
# Fill in an incremental dump by making hardlinks to the previous
# dump.
#
sub FillIncr
{
my($name) = $File::Find::name;
my($newName);
$name = $1 if ( $name =~ /(.*)/ );
return if ( $name !~ m{\Q$Dir\E/(\d+)/(.*)} );
$newName = "$CurrDumpDir/$2";
if ( -d $name && -d $newName ) {
#
# Merge the file attributes.
#
my $newAttr = BackupPC::Attrib->new({ compress => $Compress });
my $attr = BackupPC::Attrib->new({ compress => $Compress });
$newAttr->read($newName) if ( -f $newAttr->fileName($newName) );
$attr->read($name) if ( -f $attr->fileName($name) );
$newAttr->merge($attr);
#
# Now write it out, adding a link to the pool if necessary
#
my $data = $newAttr->writeData;
my $origSize = length($data);
my $fileName = $newAttr->fileName($newName);
my $poolWrite = BackupPC::PoolWrite->new($bpc, $fileName,
length($data), $Compress);
$poolWrite->write(\$data);
my($exists, $digest, $outSize, $errs) = $poolWrite->close;
if ( @$errs ) {
print("log ", join("", @$errs));
}
if ( $exists ) {
$nFilesExist++;
$sizeExist += $origSize;
$sizeExistComp += $outSize;
} elsif ( $outSize > 0 ) {
$nFilesNew++;
$sizeNew += $origSize;
$sizeNewComp += -s $outSize;
LinkNewFile($digest, $origSize, $fileName);
}
} elsif ( -f $name && !-f $newName ) {
#
# Exists in the older filled backup, and not in the new, so link it
#
link($name, $newName);
}
}
#
# Add a link in the pool to a new file
#
sub LinkNewFile
{
my($d, $size, $fileName) = @_;
my $res = $bpc->MakeFileLink($fileName, $d, 1, $Compress);
if ( $res == 1 ) {
$nFilesExist++;
$sizeExist += $size;
$sizeExistComp += -s $fileName;
} elsif ( $res == 2 ) {
$nFilesNew++;
$sizeNew += $size;
$sizeNewComp += -s $fileName;
} elsif ( $res != 0 && $res != -1 ) {
print("log BackupPC_link got error $res when calling"
. " MakeFileLink($fileName, $d, 1)\n");
}
}
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