[Bug 250906] net/samba412: "samba-tool domain backup offline" hangs

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250906

            Bug ID: 250906
           Summary: net/samba412: "samba-tool domain backup offline" hangs
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: timur at FreeBSD.org
          Reporter: ml at netfence.it
             Flags: maintainer-feedback?(timur at FreeBSD.org)
          Assignee: timur at FreeBSD.org

#samba-tool domain backup offline --targetdir .
running backup on dirs: /var/db/samba4/private /var/db/samba4 /usr/local/etc
Starting transaction on /var/db/samba4/private/secrets
(...)

What is really hanged is a subprocess that samba-tool starts:
/usr/local/bin/tdbbackup -s .copy.tdb /var/db/samba4/private/secrets.ldb 



This is a  long standing issue since Samba 4.10 (which introduced this
command).
Now I tried upgrading to 4.12, but nothing changed.

A discussion on Samba's mailing list suggested this might be caused by an older
version of TDB and that that library should be bundled.

Building (in Poudriere) with SAMBA4_BUNDLED_TDB=yes, however will produce the
following:
# samba-tool domain backup offline --targetdir .
running backup on dirs: /var/db/samba4/private /var/db/samba4 /usr/local/etc
Starting transaction on /var/db/samba4/private/secrets
ERROR(<class 'FileNotFoundError'>): uncaught exception - [Errno 2] No such file
or directory: '/root/bin/tdbbackup': '/root/bin/tdbbackup'
  File "/usr/local/lib/python3.7/site-packages/samba/netcmd/__init__.py", line
186, in _run
    return self.run(*args, **kwargs)
  File "/usr/local/lib/python3.7/site-packages/samba/netcmd/domain_backup.py",
line 1061, in run
    self.backup_secrets(paths.private_dir, lp, logger)
  File "/usr/local/lib/python3.7/site-packages/samba/netcmd/domain_backup.py",
line 954, in backup_secrets
    self.offline_tdb_copy(secrets_path + '.ldb')
  File "/usr/local/lib/python3.7/site-packages/samba/netcmd/domain_backup.py",
line 928, in offline_tdb_copy
    tdb_copy(path, backup_path, readonly=True)
  File "/usr/local/lib/python3.7/site-packages/samba/tdb_util.py", line 40, in
tdb_copy
    status = subprocess.check_call(tdbbackup_cmd, close_fds=True, shell=False)
  File "/usr/local/lib/python3.7/subprocess.py", line 358, in check_call
    retcode = call(*popenargs, **kwargs)
  File "/usr/local/lib/python3.7/subprocess.py", line 339, in call
    with Popen(*popenargs, **kwargs) as p:
  File "/usr/local/lib/python3.7/subprocess.py", line 800, in __init__
    restore_signals, start_new_session)
  File "/usr/local/lib/python3.7/subprocess.py", line 1551, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
A transaction is still active in ldb context [0x800a3cae0] on
/var/db/samba4/private/secrets.ldb

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