[winswitch] Xpra GL and gtkglext woes

[Antoine Martin]

On 07/03/18 00:46, Ben Sferrazza via shifter-users wrote:
> On Tue, Mar 6, 2018 at 9:24 AM, Antoine Martin via shifter-users <
> shifter-users at lists.devloop.org.uk> wrote:
> 
>>> OK thanks. Xpra server is running as shown here. Its own log file doesn't
>>> seem to react to the client connecting from below.
>> That's because it never gets a connection from the client, see below.
>> So, it seems that you're using SSH. I always advise to try with plain
>> TCP or SSL first before introducing a transport intermediary like SSH.
>>
> 
>  OK. I thought as a regular user I wouldn't have access to bind to TCP
> ports. I at least know I can SSH into these machines.
Only ports lower than 1024 require special privileges.
See CAP_NET_BIND_SERVICE on Linux.

>>> 2018-03-06 08:44:04,610 poll() procinfo list: [ProcInfo({'returncode':
>>> None, 'name': 'ssh', 'process': <subprocess.Popen object at
>>> 0x000000001a2d3250>, 'pid': 15132, 'dead': False, 'ignore': True,
>>> 'callback': None, 'command': ['plink', '-ssh', '-agent', '-T',
>>> 'l-server-13', 'xpra initenv;if [ -x ~/.xpra/run-xpra ]; then
>>> ~/.xpra/run-xpra _proxy :100;elif [ -x $XDG_RUNTIME_DIR/xpra/run-xpra ];
>>> then $XDG_RUNTIME_DIR/xpra/run-xpra _proxy :100;elif type "xpra" >
>>> /dev/null 2>&1; then xpra _proxy :100;elif [ -x /usr/local/bin/xpra ];
>> then
>>> /usr/local/bin/xpra _proxy :100;else echo "no run-xpra command found";
>> exit
>> (..)
>>
>>> 2018-03-06 08:44:12,788 process_gibberish(['gibberish', "invalid packet
>>> header byte C: '436164656e636520' read buffer='Cadence digital tool
>>> setup\\n' (27 bytes)", 'Cadence digital tool setup\n'])
>> And here is your problem.
>> Something in your user environment is printing out some text to the SSH
>> terminal connection which xpra uses to communicate with the xpra server.
>> When it sees that this isn't xpra's protocol, it drops the connection.
>>
>> Either clean this up from your user's login scripts or use TCP / SSL
>> connections instead.
> 
> 
> I commented out the line that sources a tool setup script (for Cadence CAD
> software that echos back stuff) in my shell rc file. I can now launch an
> xterm window!! Thank you. I suppose I can always source that too setup
> script on demand when I actually need it, as opposed to sourcing it always
> in my shell's rc file.
Or you can source it and redirect its output to a file or /dev/null

Cheers
Antoine