Jeff,
The tar XferMethod doesn't capture acls and xattrs during backup.
Direct Restore in the CGI interface uses the XferMethod setting.
Craig
On Thu, May 21, 2020 at 10:05 PM <backu...@kosowsky.org> wrote:
> I also assume that tar doesn't capture ACLs and XATTRs for backup
> either then
>
> What transfer mechanism does the CGI restore use?
> Because when I use the direct download mode, it also doesn't restore
> the ACLs and XATTRs.
>
> In any case, I guess I really need to figure out how to use rsync for
> restore...
>
>
> Craig Barratt via BackupPC-users wrote at about 21:50:40 -0700 on
> Thursday, May 21, 2020:
> > Jeff,
> >
> > Unfortunately BackupPC_tarCreate doesn't support acls. Over the years
> > different flavors of tar supported different archive formats for certain
> > extensions (eg, long file names etc). The POSIX standard for PAX
> headers
> > unified some of the those disparate formats, but didn't define acl or
> xattr
> > support.
> >
> > Over the last few years it does look like GNU tar provides support for
> > acls, but using PAX headers that are not standard. Looking at the tar
> > source, it uses headers like SCHILY.acl.access, SCHILY.xattr etc.
> > Supporting those headers appears to require the acls and xattrs to be
> > converted to descriptive strings. Currently BackupPC rsync treats acls
> and
> > xattr as binary blobs of data that it doesn't need to interpret. So
> > unfortunately it would be quit difficult to add acl and xattr support to
> > BackupPC_tarCreate.
> >
> > Craig
> >
> > On Tue, May 19, 2020 at 11:49 PM <backu...@kosowsky.org> wrote:
> >
> > >
> > > Now that I have btrfs snapshots set up, I decided to test a full
> > > backup and restore by comparing the snapshot with the backup-restore
> > > via rsync, using the following command:
> > > sudo -u backuppc /usr/share/backuppc/bin/BackupPC_tarCreate -h
> myhost
> > > -n -1 -s myshare . | sudo tar --acls --selinux --xattrs -xvf -
> > >
> > > Interestingly, I found that everything worked *except* that it failed
> > > to copy any sockets or any extended attributes.
> > >
> > > 1. Sockets were not copied at all - but that is seemingly just a tar
> > > limitation since tar can't copy 'special' files.
> > > Indeed, backuppc-fuse shows that the files are actually backed up
> by
> > > bakcuppc
> > >
> > > 2. Extended attributes (ACLs and SELinux context) were *never*
> restored
> > >
> > > This seems to be a problem with 'BackupPC_tarCreate" since:
> > > a] Using tar alone, I can copy the files with all their extended
> > > attributes
> > > cd <myshare>; tar --acls --selinux --xattrs -cf - mac ) | tar
> xf -
> > > b] Similarly, raw rsync copies all the files faithfully
> > > rsync -navcxXAOH --delete <myshare> .
> > > b] Backuppc-fuse shows the extended attributes
> > > (though that being said backuppc-fuse adds SELinux context
> attributes
> > > to files that don't have them... perhaps there is something
> wrong
> > > with the inheritance??
> > >
> > > Note: I tried adding ' --xargs --acls --selinux --xattrs'
> > > to $Conf{TarClientRestoreCmd} but that didn't help.
> > >
> > > So, 2 questions:
> > > 1. Why doesn't BackupPC_tarCreate restore the extended attributes?
> > > 2. Why does backuppc-fuse show extended attributes for files that
> > > don't have them originally?
> > >
> > > ----------
> > > Note: I am running ubuntu 18.04 with rsync 3.1.2 and backuppc 4.3.2
> > >
> > >
> > > _______________________________________________
> > > BackupPC-users mailing list
> > > BackupPC-users@lists.sourceforge.net
> > > List: https://lists.sourceforge.net/lists/listinfo/backuppc-users
> > > Wiki: http://backuppc.wiki.sourceforge.net
> > > Project: http://backuppc.sourceforge.net/
> > >
> > _______________________________________________
> > BackupPC-users mailing list
> > BackupPC-users@lists.sourceforge.net
> > List: https://lists.sourceforge.net/lists/listinfo/backuppc-users
> > Wiki: http://backuppc.wiki.sourceforge.net
> > Project: http://backuppc.sourceforge.net/
>
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