cannot backup on a mount point cifs

[marcoratto]

I'm running the following command:

borg init --encryption=none /mnt/nas/repo_borg/bin

But I have the following error:

Local Exception
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/borg/archiver.py", line 5401, in main
    exit_code = archiver.run(args)
                ^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/borg/archiver.py", line 5321, in run
    return set_ec(func(args))
                  ^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/borg/archiver.py", line 190, in wrapper
    return method(self, args, repository=repository, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/borg/archiver.py", line 296, in do_init
    repository.commit(compact=False)
  File "/usr/lib/python3/dist-packages/borg/repository.py", line 506, in commit
    self.write_index()
  File "/usr/lib/python3/dist-packages/borg/repository.py", line 633, in write_index
    transaction_id = self.io.get_segments_transaction_id()
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/borg/repository.py", line 1379, in get_segments_transaction_id
    if self.is_committed_segment(segment):
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3/dist-packages/borg/repository.py", line 1413, in is_committed_segment
    if fd.read(self.header_fmt.size) != self.COMMIT:
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
OSError: [Errno 61] No data available

Borg: 1.2.8  Python: CPython 3.12.3 msgpack: 1.0.3 fuse: None [pyfuse3,llfuse]
PID: 19254  CWD: /home/marco/bin
sys.argv: ['/usr/bin/borg', 'init', '--encryption=none', '/mnt/nas/repo_borg/bin']
SSH_ORIGINAL_COMMAND: None

I don't have the error if I launch the same command on a usb hard diskk connected directly to the laptop.

[ThomasWaldmann]

There are quite some buggy filesystems out there, including cifs implementations (either server or client side).

What borg does there is a simple read operation and that should return data from that open file, not raise an exception.

What you can try is to play around with mount options or use a different kind of fs.