Backup Central

Hi,

I just installed BackupPC 2.1.0beta1 and I'm seeing a problem with
incremental SMB backups of a couple of Windows 2000 hosts. Here's an
example of the error:

Contents of log file /d2/backuppc/pc/eeyore/XferLOG.bad.z, modified
2004-04-13 04:00:08 (Extracting only Errors)

Running: /usr/bin/smbclient =5C=5C=5C=5Ceeyore=5C=5Cbackup -U backup -E -=
N -d 1 -c
tarmode=5C full -TcN /d2/backuppc/pc/eeyore/timeStamp.level0 -
Xfer PIDs are now 14439,14438
=5B skipped 5 lines =5D
tarExtract: Unexpected end of tar archive (tot =3D 512, num =3D , posn =3D=
)
tarExtract: BackupPC_tarExtact aborting (Unexpected end of tar archive)
tarExtract: Done: 1 errors, 0 filesExist, 0 sizeExist, 0 sizeExistComp, 0=

filesTotal, 0 sizeTotal
Got fatal error during xfer (Unexpected end of tar archive)
Backup aborted (Unexpected end of tar archive)

If I run that smbclient command from the command line I get =22Error sett=
ing
newer-than time=22.

The timeStamp.level0 file doesn't exist for either host. The full backup=

worked fine for both hosts. When should the timestamp file have been
created?

Thanks,

Don Silvia







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"Don Silvia" writes:

I just installed BackupPC 2.1.0beta1 and I'm seeing a problem with
incremental SMB backups of a couple of Windows 2000 hosts. Here's an
example of the error:

Just to confirm, this is your first install, or do you also
mean that it used to work on BackupPC 2.0.2 and it is now
broken just in BackupPC 2.1.0beta1?

Contents of log file /d2/backuppc/pc/eeyore/XferLOG.bad.z, modified
2004-04-13 04:00:08 (Extracting only Errors)

Running: /usr/bin/smbclient \\\\eeyore\\backup -U backup -E -N -d 1 -c tarmode\ full -TcN /d2/backuppc/pc/eeyore/timeStamp.level0 -
Xfer PIDs are now 14439,14438
[ skipped 5 lines ]
tarExtract: Unexpected end of tar archive (tot = 512, num = , posn = )
tarExtract: BackupPC_tarExtact aborting (Unexpected end of tar archive)
tarExtract: Done: 1 errors, 0 filesExist, 0 sizeExist, 0 sizeExistComp, 0 filesTotal, 0 sizeTotal
Got fatal error during xfer (Unexpected end of tar archive)
Backup aborted (Unexpected end of tar archive)

If I run that smbclient command from the command line I get
"Error setting newer-than time".

The timeStamp.level0 file doesn't exist for either host. The full backup
worked fine for both hosts. When should the timestamp file have been
created?

The timestamp file gets created just before smbclient is run, and then
deleted afterwards. So when you run the command manually the file is
no longer there.

Please create your own timestamp file (or pick any file with a
certain mtime). Then you are doing exactly the right thing by
running the smbclient command manually to see what is wrong.

Also, it might be helpful to see what the 5 skipped lines were.

Finally, what version of smbclient are you using?

Craig


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This is interesting. Both Win 2K hosts have at least one share where no
files have changed. This is pretty common for me, so I *did* set
$Conf{BackupZeroFilesIsFatal} = 0; in the main config.pl. Does this work
differently in 2.1.0beta1?

No, it should be the same in 2.1.0beta1.

I've been able to replicate this, and it is a bug. An incremental or
full with smbclient will fail if there are no files or subdirectories
to backup (ie: an empty tar file). I believe the same bug is in 2.0.2,
although I haven't confirmed this.

In any case, I will send a patch most likely tomorrow night.

Craig

Were you going to send the patch to the list, or should I get the CVS
version, or wait for beta 2?

I was hoping to get beta2 out sooner, but there is a nagging issue
with rsync checksum caching that I can't replicate.

Here's a patch against beta1. Please tell me if it solves your problem.

Craig

--- bin/BackupPC_tarExtract.orig Fri Apr 9 23:42:48 2004
+++ bin/BackupPC_tarExtract Fri Apr 16 20:03:28 2004
< at > < at > -115,6 +115,7 < at > < at >
my $ExistFileCompSize = 0;
my $TotalFileCnt = 0;
my $TotalFileSize = 0;
+my $TarReadHdrCnt = 0;

sub TarRead
{
< at > < at > -128,6 +129,7 < at > < at >
substr($data, $numBytes, $totBytes - $numBytes),
$totBytes - $numBytes);
if ( $newBytes <= 0 ) {
+ return if ( $TarReadHdrCnt == 1 ); # empty tar file ok
print("Unexpected end of tar archive (tot = $totBytes,"
. " num = $numBytes, posn = " . sysseek($fh, 0, 1) . ")\n");
$Abort = 1;
< at > < at > -144,6 +146,7 < at > < at >
{
my($fh) = < at > _;

+ $TarReadHdrCnt++;
return $1 if ( TarRead($fh, $tar_header_length) =~ /(.*)/s );
return;
}
< at > < at > -423,26 +426,30 < at > < at >
my $poolWrite = BackupPC::PoolWrite->new($bpc, $fileName,
length($data), $Compress);
$poolWrite->write(\$data);
- processClose($poolWrite, $Attrib{$d}->fileName($d), length($data));
+ processClose($poolWrite, $Attrib{$d}->fileName($d), length($data), 1);
}
delete($Attrib{$d});
}

sub processClose
{
- my($poolWrite, $fileName, $origSize) = < at > _;
+ my($poolWrite, $fileName, $origSize, $noStats) = < at > _;
my($exists, $digest, $outSize, $errs) = $poolWrite->close;

if ( < at > $errs ) {
print(join("", < at > $errs));
$Errors += < at > $errs;
}
+ if ( !$noStats ) {
$TotalFileCnt++;
$TotalFileSize += $origSize;
+ }
if ( $exists ) {
+ if ( !$noStats ) {
$ExistFileCnt++;
$ExistFileSize += $origSize;
$ExistFileCompSize += $outSize;
+ }
} elsif ( $outSize > 0 ) {
print(NEW_FILES "$digest $origSize $fileName\n");
}


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