Comment 4 for bug 1505590

I believe this is working correctly in the current version in trusty: 2:4.3.11+dfsg-0ubuntu0.14.04.12

- testparm warns about it:

# testparm -s
Load smb config files from /etc/samba/smb.conf
WARNING: The "syslog" option is deprecated
Processing section "[printers]"
Processing section "[print$]"
Loaded services file OK.
WARNING: The 'netbios name' is too long (max. 15 chars).

Server role: ROLE_STANDALONE

# Global parameters
[global]
 netbios name = XABCDEFGHIJKLMNOPQRSTUVWXYZ

- nmblookup shows the truncated name:

root@trusty-samba-netbios-truncate-1505590:~# nmblookup '*'
10.0.100.204 *<00>
root@trusty-samba-netbios-truncate-1505590:~# nmblookup -A 10.0.100.204
Looking up status of 10.0.100.204
 WORKGROUP <00> - <GROUP> B <ACTIVE>
 WORKGROUP <1e> - <GROUP> B <ACTIVE>
 XABCDEFGHIJKLMN <00> - B <ACTIVE>
 XABCDEFGHIJKLMN <03> - B <ACTIVE>
 XABCDEFGHIJKLMN <20> - B <ACTIVE>

 MAC Address = 00-00-00-00-00-00

- smbclient -L shows it as well, truncated:
root@trusty-samba-netbios-truncate-1505590:~# smbclient -L localhost -N
WARNING: The "syslog" option is deprecated
Domain=[WORKGROUP] OS=[Windows 6.1] Server=[Samba 4.3.11-Ubuntu]

 Sharename Type Comment
 --------- ---- -------
 print$ Disk Printer Drivers
 IPC$ IPC IPC Service (trusty-samba-netbios-truncate-1505590 server (Samba, Ubuntu))
Domain=[WORKGROUP] OS=[Windows 6.1] Server=[Samba 4.3.11-Ubuntu]

 Server Comment
 --------- -------
 XABCDEFGHIJKLMN trusty-samba-netbios-truncate-1505590 server (Sa

 Workgroup Master
 --------- -------
 WORKGROUP

- %m expands to the whole thing:
# l /var/log/samba/log.xabcdefghijklmnopqrstuvwxyz
-rw-r--r-- 1 root root 0 Sep 28 14:25 /var/log/samba/log.xabcdefghijklmnopqrstuvwxyz

- nmbd logs errors, but using the whole name, not an empty string:
[2017/09/28 14:29:05.387607, 0] ../source3/nmbd/nmbd_become_lmb.c:533(become_local_master_browser)
  become_local_master_browser: Error - cannot find server XABCDEFGHIJKLMNOPQRSTUVWXYZ in workgroup WORKGROUP on subnet 10.0.100.204

artful which has samba 4.6.7 behaves mostly the same, it just doesn't list the server under the "Server" header in the smbclient -L output.

Given all the above, I'll mark this bug as fix released in trusty. If there is evidence to the contrary, please reopen it and comment.

Thanks!