Using ldapscripts within byobu

[Aritchie]

Ubuntu Server 12.04.1 LTS
byobu 5.22
tmux 1.6-1ubuntu1

When I run byobu on server console and then try to run say sudo ldapfinger username, I get the response:

Could not guess current user

Is this expected behaviour or shouldl it work with byobu. I get the same response with sudo lsldap. I have not tried the other ldapscripts.

[Aritchie (aritchie)]

Okay, after doing some more investigating I have discovered this problem only exists when I run byobu with tmux as the backend. If I run it with screen as the backend then ldapfinger and lsldap work as expected.

[DaveQB (david-dward)]

I also have this issue.

[Aritchie (aritchie)]

Apparently it only exhibits this behavior at the server console itself. When I use byobu in an terminal on 12.04 Desktop and ssh over to the server, it does not do this - the scripts work fine.

[Dustin Kirkland  (kirkland)]

Is there a difference between the environment in the two scenarios? Can you post `env` from the console, and over ssh?

[Aritchie (aritchie)]

Hi Dustin, I did a pipe on env into text files. I did one for byobu-screen and one for byobu and compared the two. The only difference I noticed was with the TERM environment variable. For byobu-screen it is "TERM=screen-bce" and for byobu it is "TERM=screen".

[Aritchie (aritchie)]

Okay I decided to just do another pipe with env but without using sudo and it gives me more info. I will post two files. byobuS.txt for running it with screen as the backend and the other byobuT.txt with tmux as the backend.

[Aritchie (aritchie)]

Here is the other one.

[Marko Mikulicic (mmikulicic)]

I did a quick strace -f and noticed that it executes /usr/bin/logname. which is the one failing under tmux.

logname then opens /var/run/utmp and fails

[Dustin Kirkland  (kirkland)]

I can confirm this, outside of Byobu, running tmux alone. logname works when run in a shell and in screen, but fails under tmux.

kirkland@x220:~$ logname
logname: no login name
kirkland@x220:~$ echo $?
1

Strace is attached.

[graysky (graysky)]

I know this is an old bug report but I believe that you need to add this line to your ~/.tmux.conf in order for logname to return a sane value:

set -g default-terminal "xterm"

[Aritchie (aritchie)]

Sorry it took this many months for me to get back on this but I tried putting that line in the ~/.tmux.conf file and it made no difference. It still produces the same output when I attempt to use ldapfinger on a user.

[Aritchie (aritchie)]

...or at least at the server console it does. I will see what happens from a remote session from the client workstation.

[Aritchie (aritchie)]

Putting that line in the ~/.tmux.conf file makes no difference at all under any circumstances.