Re: [BackupPC-users] PaxHeader directories in smb backups with ISO-Latin-1 filenames

[Michael S. <ms...@ch...>]

On 2016-07-20 14:20, Neimar Volpini wrote:
> Hello,
> 
> Since I've upgraded to Ubuntu 16.04 I'm having problems with BackupPC
> and Samba, most of them related to samba version 4.3 (used to work fine
> in samba 4.1+).
> 
> Right now I'm struggling with smb backups for windows hosts that
> contains filenames with ISO-Latin-1 accented characters. Names like
> "exceção", "acentuação" and so... when such file name or directory name
> is found a "PaxHeader" directory is created.
> 
> My windows host directory tree:
> 
> ----------
> /acentuação
> ./acentuação/outro.txt
> ./exceção.txt
> ./pasta1
> ./pasta1/preços.txt
> ./pasta1/teste.txt
> ----------
> 
> When BackupPC does the backup it brings those "PaxHeader" extra 
> directories:
> 
> XferLOG
> ----------
> Running: /usr/bin/smbclient //apolo/teste-backup -W XXXX -U xxxx -E -d 
> 1
> -c tarmode\ full -TcrX - \\\\exclude
> full backup started for share teste-backup
> Xfer PIDs are now 31617,31616
> Domain=[XXXX] OS=[Windows Server 2008 R2 Standard 7601 Service Pack 1]
> Server=[Windows Server 2008 R2 Standard 6.1]
> tar:316  tarmode is now full, system, hidden, noreset, quiet
> tar:712  Total bytes received: 7
>    create   755       0/0         108 PaxHeader/acentuação
>    create   755       0/0           0 acentuação
>    pool     644       0/0         117 acentuação/PaxHeader/outro.txt
>    create   644       0/0           0 acentuação/outro.txt
>    create   644       0/0         108 PaxHeader/exceção.txt
>    pool     644       0/0           7 exceção.txt
>    create   755       0/0           0 pasta1
>    create   644       0/0         113 pasta1/PaxHeader/preços.txt
>    create   644       0/0           0 pasta1/preços.txt
>    create   644       0/0           0 pasta1/teste.txt
> tarExtract: Done: 0 errors, 5 filesExist, 124 sizeExist, 117
> sizeExistComp, 8 filesTotal, 453 sizeTotal
> ----------
> 
> When I execute smbclient via command line it doesn't show those 
> directories:
> 
> ----------
> /usr/bin/smbclient //apolo/teste-backup -A smbpwd -W XXXX -U xxxx -E -d
> 1 -c tarmode verbose full -TcrX - \\\\exclude | tar -tvf -
> Domain=[XXXX] OS=[Windows Server 2008 R2 Standard 7601 Service Pack 1]
> Server=[Windows Server 2008 R2 Standard 6.1]
> tar:316  tarmode is now full, system, hidden, noreset, quiet
> tar:712  Total bytes received: 7
> drwxr-xr-x 0/0               0 2016-07-20 15:50 ./acentuação/
> -rw-r--r-- 0/0               0 2016-07-19 22:00 ./acentuação/outro.txt
> -rw-r--r-- 0/0               7 2016-07-20 15:26 ./exceção.txt
> drwxr-xr-x 0/0               0 2016-07-20 15:50 ./pasta1/
> -rw-r--r-- 0/0               0 2016-07-19 22:00 ./pasta1/preços.txt
> -rw-r--r-- 0/0               0 2016-07-19 22:00 ./pasta1/teste.txt
> ----------
> 
> Some system info:
> 
> ----------
> Ubuntu 16.04.1 LTS amd64
> 
> backuppc 3.3.1-2ubuntu3
> samba 2:4.3.9+dfsg-0ubuntu0.16.04.2
> 
> locale
> LANG=pt_BR.UTF-8
> LANGUAGE=pt_BR:pt:en
> LC_CTYPE="pt_BR.UTF-8"
> LC_NUMERIC=pt_BR
> LC_TIME=pt_BR
> LC_COLLATE="pt_BR.UTF-8"
> LC_MONETARY=pt_BR
> LC_MESSAGES="pt_BR.UTF-8"
> LC_PAPER=pt_BR
> LC_NAME=pt_BR
> LC_ADDRESS=pt_BR
> LC_TELEPHONE=pt_BR
> LC_MEASUREMENT=pt_BR
> LC_IDENTIFICATION=pt_BR
> LC_ALL=
> ----------
> 
> I'm not sure it is a samba problem, system encoding problem, tar 
> problem
> ... just looking for some directions to try fixing it.
> 
> 
> Thanks.
> 
> Neimar

PaxHeader is the file that appears when tar doesn't know what to do with 
extended attributes, as per the POSIX specification.  In other words, 
whatever is creating the tar file is storing extended attributes, but 
whatever is reading the tar file and creating the "PaxHeader/..." files 
does not understand those extended attributes.