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Re: [rdiff-backup-users] Error 1? Final moment permissions problem on ta

From: Claus-Justus Heine
Subject: Re: [rdiff-backup-users] Error 1? Final moment permissions problem on target?
Date: Tue, 15 Apr 2014 11:38:25 +0200
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.9; rv:24.0) Gecko/20100101 Thunderbird/24.4.0

Could it be that perhaps the UID mapping is not set up correctly? Being
able to do r/w but not being able to preserve times and set permission
could indicate that somehow the NFS-Server "thinks" that the files are
not owned by the user issuing the command. Cam you do a "chmod"
manually? Or can it perhaps be that only the mount-directory
/mnt/new-dest is not owned by the backup user (the chmod error message
of rdiff-backup only mentions the mount-point)?

(BTW, perhaps it would be more efficient to run rdiff-backup through a
remote-shell instead of going through the NFS file system; however, the
setup would be slightly more complicated)



Am 15.04.14 11:00, schrieb Ron Leach:
> List, good morning,
> We're in the middle of moving our backup destination from an old machine
> (with only 2TB) to a new one with 6TB space; each of these is on a
> separate NFS share mounted under /mnt.  Our migration scheme is
> straightforward, but we hit a problem, possibly with permissions, and I
> don't understand what to do.
> Migration steps:
> (1) Halt the regular rdiff-backups, by commenting out the invocations in
> crontab
> (2) Using the same user as the user who runs the rdiff-backups, copy the
> existing target repository onto the new destination server;
> $ cd /mnt/exist-dest
> $ cp -a -u -v .* -t/mnt/new-dest
> (3) Execute rdiff-backup using the new machine as the destination
> $ rdiff-backup --print-statistics -v3 --exclude /Source/.Trash-1000
> /Source /mnt/new-dest
> (4) Check the log/report and, if ok, restore the automatic cron
> invocations, edited to backup to the new destination.
> We hit a problem, though, and I don't understand what to do to fix it.
> Step 2 reported an error when the cp command finished:
> cp: preserving times for `/mnt/new-dest/.': Operation not permitted
> The files had all 'seemed' to copy across ok, so I went ahead with step
> 3.  But step 3 failed also, at what was close to its final step (judging
> by the sequence of the timestamps on the various directories and files
> in the new destination):
> Exception '[Errno 1] Operation not permitted: '/mnt/new-dest'' raised of
> class '<type 'exceptions.OSError'>':
> The calling tree seems to indicate a permissions cause:
> [ ..... ]
> File "/var/lib/python-support/python2.5/rdiff_backup/rpath.py", line
> 927, in chmod
>     self.conn.os.chmod(self.path, permissions & Globals.permission_mask)
> called from:
> [ ....... ]
> File "/var/lib/python-support/python2.5/rdiff_backup/backup.py", line
> 664, in end_process
>     rpath.copy_attribs(self.dir_update, self.base_rp)
> File "/var/lib/python-support/python2.5/rdiff_backup/rpath.py", line
> 189, in copy_attribs
>     rpout.chmod(rpin.getperms())
> File "/var/lib/python-support/python2.5/rdiff_backup/rpath.py", line
> 927, in chmod
>     self.conn.os.chmod(self.path, permissions & Globals.permission_mask)
> OSError: [Errno 1] Operation not permitted: '/mnt/new-dest'
> I am sure I've set something up incorrectly on the new destination, but
> the user can read and write to it so I am not sure why there might be a
> problem.  I'd also tried to make sure that the new-destination had the
> same permissions as the old-destination.  Two questions I would like to
> ask are what is the significance of the error that cp reported?  And
> what permissions 'ought' to exist on the rdiff-backup destination?
> I'd be grateful for any comments.  I am not confident about permissions,
> in general, so even very basic remarks would be very welcome.
> regards, Ron
> _______________________________________________
> rdiff-backup-users mailing list at address@hidden
> https://lists.nongnu.org/mailman/listinfo/rdiff-backup-users
> Wiki URL:
> http://rdiff-backup.solutionsfirst.com.au/index.php/RdiffBackupWiki

-- Claus-Justus Heine address@hidden

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