Re: [BackupPC-users] BackupPC_dump fails without error

[Craig B. <cba...@us...>]

"Tristan Stahnke" writes:

> I'm having a very bizarre issue, and I believe it has something to
> do with authentication through SMB with BackupPC.  I'm using Samba
> 3.0.2a on Mandrake Linux 10, with the patch that was posted here
> for multiple entries in the exclusion list.  When I do the command
> /usr/local/share/backuppc/bin/BackupPC_dump -i -v hostname, it
> appears to go about it's job correctly, but then suddenly it pops
> up this and drops me back to the prompt:
> 
> --- hostname ping statistics ---
> 1 packets transmitted, 1 received, 0% packet loss, time 0ms
> rtt min/avg/max/mdev = 16.957/16.957/16.957/0.000 ms
> 
> CheckHostAlive: returning 16.9
> dump failed: 
> [bash]$
> 
> Now, what's so bizarre, is that if I manually run the samba command
> that BackupPC_dump runs, while BackupPC_dump is running (i.e. it
> get's the timestamp from the actions of BackupPC_dump -i), and leave
> that samba command running, and THEN start another instance of
> BackupPC_dump -i -v hostname, the incremental backup completes
> without errors.  I'm thinking maybe BackupPC isn't correctly passing
> on the password to the host, and the host is rejecting me for some
> reason.  When I run the samba command from the command line, I
> include the password in the -U expression (i.e. username%password)
> and that seems to work with authentication fine...  But when I do
> the same thing in the config.pl username field, it still fails.
>
> I have put  BPC_SMB_PASSWD in the /etc/init.d/backuppc, and I also
> have it in the login information in the host specific config.pl; it
> doesn't appear to solve the issue though.
> 
> By the way, the errors Xferlog just shows this:
> running: /usr/bin/smbclient \\\\hostname\\C\$ -U username -E -N -d 1 -c tarmode\ full -TcNrX /home/backuppc/backups/pc/hostname/timeStamp.level0 - \\RECYCLER \\pagefile.sys \\hiberfil.sys \\Program\ Files \\WINDOWS \\VIRTPART.DAT \\tmp2 \\temp2 \\temp \\System\ Volume\ Information
> Xfer PIDs are now 12529,12528
> [ skipped 1 lines ]
> tar_re_search set
> tarExtract: Done: 0 errors, 407 filesExist, 913478 sizeExist, 750314 sizeExistComp, 1306 filesTotal, 201099733 sizeTotal
> 
> Any help would be appreciated.  Is there a way to increase the
> debug level for BackupPC_dump -i -v with samba so I can see what
> it's failing on?

I can't explain this behavior.  The -d option sets the debug level
for smbclient.  You can change it via $Conf{SmbClientFullCmd} or
$Conf{SmbClientIncrCmd}.

BackupPC uses the PASSWD environment variable to set the password
for smbclient.  The value it uses is either BPC_SMB_PASSWD or
the setting of $Conf{SmbSharePasswd}.  Setting it via the
command line is obviously undesirable since it will be visible
to people running ps.

But I do recall that for smbclient 3.x the environment variable
password support was changed.  It still works correclty for
me (at least the last version I tested - probably 3.0.1).

If your BackupPC server is not used by regular users (so people can't
see process arguments with ps), you could try the -U username%password
form by setting $Conf{SmbClientFullCmd} and $Conf{SmbClientIncrCmd}
appropriately.

Craig