Error while closing snapshot file over FTP (was: Incremental backups fail but not full backups)

Thanks for reporting this issue. Please upgrade to the latest version 0.11.1 of SBackup and test whether the problem persists.
Thank you and sorry for any inconvenience (there is really a need for beta testers in order to avoid such problems).

Yes, I have done this in between and there is the same problem for sbackup 0.11.1.

Hm, the error seems to be related to the FTP connection. It is not triggered inside of sbackup. I'll look into it, however I was not able to reproduce the bug so far (FTP access to Strato HiDrive works for me without flaws).

As a workaround you could use the 'legacy' Fuse plugins if they worked for you: https://answers.launchpad.net/nssbackup/+faq/1256

The procedure described here: https://answers.launchpad.net/nssbackup/+faq/1256 is also valid for sbackup 0.11.x

Of course, you'll have to install the package 'sbackup-plugins-fuse' then.

The fix is to handle the error (gio.Error) on closing the stream.
An exception on closing a stream for reading should not lead to a failing application. Even more if the error say that the connection is closed. So my suggestion is to catch the error and log but do not fail.
Here is some code that works for me:

import sys

...

try:
    fd.close()
except:
    LogFactory.getLogger().warn("error on closing the snarfile header after reading: " + sys.exc_info()[1])

With this fix I can now create incremental backups.

Thanks for your fix. However, I've set the bug status to progress since the fix is not yet committed to trunk or 0.11 branch. I'll add the workaround to series 0.11. The question that remains is: why does this happen?

if my investigation is right then is this error with the message "data connection closed" thrown when the server closes the the connection.

Did this happen every time you've tried to make an incremental backup? What kind of FTP server are you running (is it NAS with FTP access, an old machine running a FTP server,...)? Are you able to reproduce the error? If so, I guess there is another thing that actually causes the FTP server to close the connection.

A Buffalo LinkStation Mini 2.5 1 TB with a ftp server. Yes, this happens everytime.

I've seen this error a few times on Maverick now. However, it did not happened every time. What distribution are you using?

Ubuntu 10.4

Users running nssbackup are encouraged to switch over to sbackup. This won't fix in nssbackup.

Hi,

I get exactly the same problem with my server provider's backup FTP (online.net).

Full backup is OK, but incremental will fail.

I'm on ubuntu 10.4 Lucid Lynx

using 0.11.4

Error log tells :
SBackup 'Default Profile' Logger
==============
(...)
2012-03-07 11:12:41,694 - INFO: Perform tests at specified location
2012-03-07 11:12:42,047 - INFO: Checking for snapshots stored in old formats
2012-03-07 11:12:42,115 - INFO: Last full backup is 0 days old < 21 -> make inc backup
2012-03-07 11:12:42,234 - INFO: Snapshot '2012-03-07_11.12.42.115894.Balderdash.inc' is being made.
2012-03-07 11:12:42,235 - INFO: Setting Base to '2012-03-07_09.41.33.885286.Balderdash.ful'.
2012-03-07 11:12:42,236 - INFO: Setting packages File.
2012-03-07 11:12:42,425 - INFO: Setting Excludes File.
2012-03-07 11:12:42,426 - INFO: Setting compression format to `gzip`
2012-03-07 11:12:42,427 - INFO: Option 'Follow symbolic links' is disabled.
2012-03-07 11:12:42,427 - INFO: Inspect file system and collect file infos
2012-03-07 11:27:42,579 - WARNING: error on closing the snarfile header after reading: Host closed connection
2012-03-07 11:27:42,600 - ERROR: An error occurred during the backup: Operation unsupported
2012-03-07 11:27:43,757 - INFO: Terminating GIO File Access Manager.
2012-03-07 11:27:43,760 - INFO: Processing of profile failed with error: Operation unsupported

Using FUSE wont work (can't set ftp access when fuse is activated : errnum 5 I/O error

Is there a quickfix for this ?

Sincerely,