cross-platform backup tool Rdiff-backup crashes when backing up to NFS (Devuan)

[Tobias Leupold]

Hi all,

I've been using rdiff-backup without any problem now for years, but now 
I have one: I'm about to migrate a small server from Gentoo to Devuan. I 
got most of my stuff working, but my automated backup to an NFS share 
doesn't work. Rdiff-backup crashes.

I can't even backup a single file to the share:

    # cd
    # mkdir foo
    # touch foo/bar
    # rdiff-backup foo/ /nas/backup/test/
    Exception '[Errno 22] Invalid argument' raised of class '<class 
'OSError'>':
    File "/usr/lib/python3/dist-packages/rdiff_backup/Main.py", line 
395, in error_check_Main
        Main(arglist)
    File "/usr/lib/python3/dist-packages/rdiff_backup/Main.py", line 
417, in Main
        take_action(rps)
    File "/usr/lib/python3/dist-packages/rdiff_backup/Main.py", line 
353, in take_action
        Backup(rps[0], rps[1])
    File "/usr/lib/python3/dist-packages/rdiff_backup/Main.py", line 
442, in Backup
        backup.Mirror(rpin, rpout)
    File "/usr/lib/python3/dist-packages/rdiff_backup/backup.py", line 
39, in Mirror
        DestS.patch(dest_rpath, source_diffiter)
    File "/usr/lib/python3/dist-packages/rdiff_backup/backup.py", line 
269, in patch
        ITR(diff.index, diff)
    File "/usr/lib/python3/dist-packages/rdiff_backup/rorpiter.py", 
line 313, in __call__
        last_branch.fast_process(*args)
    File "/usr/lib/python3/dist-packages/rdiff_backup/backup.py", line 
587, in fast_process
        if self.patch_to_temp(mirror_rp, diff_rorp, tf):
    File "/usr/lib/python3/dist-packages/rdiff_backup/backup.py", line 
636, in patch_to_temp
        rpath.copy_attribs(diff_rorp, new)
    File "/usr/lib/python3/dist-packages/rdiff_backup/rpath.py", line 
238, in copy_attribs
        rpout.write_ea(rpin.get_ea())
    File "/usr/lib/python3/dist-packages/rdiff_backup/rpath.py", line 
1664, in write_ea
        ea.write_to_rp(self)
    File "/usr/lib/python3/dist-packages/rdiff_backup/eas_acls.py", 
line 131, in write_to_rp
        self.clear_rp(rp)
    File "/usr/lib/python3/dist-packages/rdiff_backup/eas_acls.py", 
line 106, in clear_rp
        rp.conn.xattr.remove(rp.path, name, rp.issym())

    Traceback (most recent call last):
    File "/usr/bin/rdiff-backup", line 32, in <module>
        rdiff_backup.Main.error_check_Main(sys.argv[1:])
    File "/usr/lib/python3/dist-packages/rdiff_backup/Main.py", line 
395, in error_check_Main
        Main(arglist)
    File "/usr/lib/python3/dist-packages/rdiff_backup/Main.py", line 
417, in Main
        take_action(rps)
    File "/usr/lib/python3/dist-packages/rdiff_backup/Main.py", line 
353, in take_action
        Backup(rps[0], rps[1])
    File "/usr/lib/python3/dist-packages/rdiff_backup/Main.py", line 
442, in Backup
        backup.Mirror(rpin, rpout)
    File "/usr/lib/python3/dist-packages/rdiff_backup/backup.py", line 
39, in Mirror
        DestS.patch(dest_rpath, source_diffiter)
    File "/usr/lib/python3/dist-packages/rdiff_backup/backup.py", line 
269, in patch
        ITR(diff.index, diff)
    File "/usr/lib/python3/dist-packages/rdiff_backup/rorpiter.py", 
line 313, in __call__
        last_branch.fast_process(*args)
    File "/usr/lib/python3/dist-packages/rdiff_backup/backup.py", line 
587, in fast_process
        if self.patch_to_temp(mirror_rp, diff_rorp, tf):
    File "/usr/lib/python3/dist-packages/rdiff_backup/backup.py", line 
636, in patch_to_temp
        rpath.copy_attribs(diff_rorp, new)
    File "/usr/lib/python3/dist-packages/rdiff_backup/rpath.py", line 
238, in copy_attribs
        rpout.write_ea(rpin.get_ea())
    File "/usr/lib/python3/dist-packages/rdiff_backup/rpath.py", line 
1664, in write_ea
        ea.write_to_rp(self)
    File "/usr/lib/python3/dist-packages/rdiff_backup/eas_acls.py", 
line 131, in write_to_rp
        self.clear_rp(rp)
    File "/usr/lib/python3/dist-packages/rdiff_backup/eas_acls.py", 
line 106, in clear_rp
        rp.conn.xattr.remove(rp.path, name, rp.issym())
    OSError: [Errno 22] Invalid argument

Using the very same share on another machine (running Gentoo and Artix) 
letting rdiff-backup make some backup to it works without a problem, so 
I suppose my NFS server is okay, and this is some Devuan (and also 
Debian?) specific problem.

I'm a bit out of ideas now ... can anybody help me? Thanks in advance!

Cheers, Tobias