[FreeNX-kNX] Some other checks to add to nxloadconfig --check directive.

[Gregory Carter]

drwxrwxrwt  2 root    root       4096 2008-03-20 09:41 .X11-unix

The above directory was missing on one of my Fedora 8 systems, which, 
was running at init level 3, remotely at a colo service, so probably is 
not surprising  However,  I found I could not startup a NX session, and 
I got the following:

[root at brahe C-brahe-1000-A9FCFB81F1EF2ED623C631FEBB27A978]# cat clients
_XSERVTransmkdir: ERROR: euid != 0,directory /tmp/.X11-unix will not be 
created.
_XSERVTransSocketUNIXCreateListener: mkdir(/tmp/.X11-unix) failed, errno = 2
_XSERVTransMakeAllCOTSServerListeners: failed to create listener for local

So I created it as follows:

# mkdir /tmp/.X11-unix
# chmod 1777 /tmp/.X11-unix

Interesting enough if you look in the session file, you get a totally 
nonsensical output if /tmp/.X11-unix is not present ot has the wrong 
permissions set on it, which wasn't very helpful in figuring out this 
problem.

NXAGENT - Version 3.1.0

Copyright (C) 2001, 2007 NoMachine.
See http://www.nomachine.com/ for more information.

Info: Agent running with pid '16563'.
Session: Starting session at 'Thu Mar 20 11:55:49 2008'.
Info: Proxy running in server mode with pid '16563'.
Info: Waiting for connection from '127.0.0.1' on port '5000'.
Info: Accepted connection from '127.0.0.1'.
Info: Connection with remote proxy completed.
Info: Using MODEM link parameters 256/24/1/0.
Info: Using agent parameters 5000/50/50/0/0.
Info: Using cache parameters 4/4096KB/131072KB/131072KB.
Info: Using pack method 'adaptive-3' with session 'unix-kde'.
Info: Using ZLIB data compression 1/1/32.
Info: Using ZLIB stream compression 9/9.
Info: No suitable cache file found.
Info: Listening to X11 connections on display ':1000'.
Info: Established X client connection.
Info: Using shared memory parameters 1/1/0/0K.
Info: Using alpha channel in render extension.
Info: Using local device configuration changes.
Session: Session started at 'Thu Mar 20 11:55:51 2008'.
Session: Terminating session at 'Thu Mar 20 11:55:53 2008'.
Info: Watchdog running with pid '16686'.
Info: Waiting the watchdog process to complete.
        set a property to a given value
    -root                          examine the root window
    -len n                         display at most n bytes of any property
    -notype                        do not display the type field
    -fs filename                   where to look for formats for properties
    -frame                         don't ignore window manager frames
    -f propname format [dformat]   formats to use for property of given name
    -spy                           examine window properties forever

kdeinit: Can't connect to the X Server.
kdeinit: Might not terminate at end of session.
kded: cannot connect to X server :1000
kcminit_startup: cannot connect to X server :1000
ksmserver: cannot connect to X server :1000
startkde: Shutting down...
klauncher: Exiting on signal 1
startkde: Running shutdown scripts...
xprop:  unable to open display ':1000'
usage:  xprop [-options ...] [[format [dformat]] atom] ...

where options include:
    -grammar                       print out full grammar for command line
    -display host:dpy              the X server to contact
    -id id                         resource id of window to examine
    -name name                     name of window to examine
    -font name                     name of font to examine
    -remove propname               remove a property
    -set propname value            set a property to a given value
    -root                          examine the root window
    -len n                         display at most n bytes of any property
    -notype                        do not display the type field
    -fs filename                   where to look for formats for properties
    -frame                         don't ignore window manager frames
    -f propname format [dformat]   formats to use for property of given name
    -spy                           examine window properties forever

startkde: Done.

So what I propose, is to add this check to nxloadconfig to properly 
check the environment for those of us running remote servers in runlevel 
3 (without a GUI head).  Here is what I would suggest:

# nxloadconfig --check

Error: /tmp/.X11-unix is not present or has the wrong permissions.  If 
not set you will not be able to start any X sessions.  To correct, try # 
mkdir /tmp/.X11-unix;chmod 1777 /tmp/.X11-unix.

-gc