Hi Derek,
I won't be very helpful but the issue appears within the open function
of Python, so not in the code of rdiff-backup (which doesn't mean that
we can't do anything about it, just that it is more difficult to
troubleshoot).
From the look of it and knowing what I know about Android and MTP, I
guess an issue with either a user/group ID, time stamp or access rights,
or even the file descriptor.
Android looks like POSIX but it doesn't comply to it so you might have
hit one of those corner cases (why now and not before, no clue).
I could also imagine that you have an issue with the MTP file system
giving up on rdiff-backup opening and closing files with high frequency.
MTP isn't known to be the most performant thing in the world, to say the
least.
Two more or less helpful hints:
1. solving the issue would probably require reproducing it with Python
code to understand the exact cause, before I would be potentially able
to find a workaround
2. as an alternative to MTP (urk!), I've been playing with rdiff-backup
on my smart-phone with SSH using Termux. I wouldn't say that it was
production grade, but it worked (I didn't pursue the idea because I
didn't need it, I was just playing around).
KR, Eric
On 14.06.2024 16:26, Derek Atkins wrote:
Hi,
I've recently been attempting to backup my phone using rdiff backup.
Last
backup was successful 3 months ago (yeah, yeah, I know -- I should
backup
more often).
I use mtpfs-simple to mount the phone as a file system on my Fedora-38
system and use rdiff-backup (rdiff-backup-2.2.6-3.fc38.x86_64) to sync
it
to my laptop. However, lately RDB has been barfing during the backup.
The exact file where it errors out changes from attempt to attempt, but
the error always appears to be the same:
WARNING: Exception '[Errno 34] Numerical result out of range:
b'/path/to/file'' raised of class '<class 'OSError'>':
File "/usr/lib64/python3.11/site-packages/rdiff_backup/robust.py",
line
94, in check_common_error
return function(*args)
^^^^^^^^^^^^^^^
File "/usr/lib64/python3.11/site-packages/rdiff_backup/rpath.py",
line
1129, in open
return open(self.path, mode)
^^^^^^^^^^^^^^^^^^^^^
Traceback (most recent call last):
File "/usr/bin/rdiff-backup", line 33, in <module>
sys.exit(load_entry_point('rdiff-backup==2.2.6', 'console_scripts',
'rdiff-backup')())
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib64/python3.11/site-packages/rdiffbackup/run.py", line
35,
in main
sys.exit(main_run(sys.argv[1:]))
^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib64/python3.11/site-packages/rdiffbackup/run.py", line
108,
in main_run
ret_val |= conn_act.run()
^^^^^^^^^^^^^^
File
"/usr/lib64/python3.11/site-packages/rdiffbackup/actions/backup.py",
line 154, in run
backup.mirror_and_increment_compat200(
File "/usr/lib64/python3.11/site-packages/rdiff_backup/backup.py",
line
53, in mirror_and_increment_compat200
DestS.patch_and_increment(dest_rpath, source_diffiter, inc_rpath)
File "/usr/lib64/python3.11/site-packages/rdiff_backup/backup.py",
line
208, in patch_and_increment
for diff in rorpiter.FillInIter(source_diffiter, dest_rpath):
File "/usr/lib64/python3.11/site-packages/rdiff_backup/rorpiter.py",
line 406, in FillInIter
for rp in rpiter:
File "/usr/lib64/python3.11/site-packages/rdiff_backup/backup.py",
line
134, in get_diffs
attach_snapshot(diff_rorp, src_rp)
File "/usr/lib64/python3.11/site-packages/rdiff_backup/backup.py",
line
96, in attach_snapshot
fileobj = robust.check_common_error(
^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib64/python3.11/site-packages/rdiff_backup/robust.py",
line
94, in check_common_error
return function(*args)
^^^^^^^^^^^^^^^
File "/usr/lib64/python3.11/site-packages/rdiff_backup/rpath.py",
line
1129, in open
return open(self.path, mode)
^^^^^^^^^^^^^^^^^^^^^
OSError: [Errno 34] Numerical result out of range: b'/path/to/file'
The command-line is:
rdiff-backup --exclude-globbing-filelist /path/of/my-excludes
/path/to/source-dir /path/of/backup-dir
Any ideas?
Version 2.2.6 is the latest version available on F38.
-derek
