Re: [screen-devel] [bug #39389] "screen -r" should optionally pick up X11 DISPLAY variable from environment

[Maciej Żenczykowski]

I don't think there is a generic way to make this truly automatic.
There's a bunch of variables (ie. potentially a user-specifiable list)
that need this treatment

SSH_AGENT_PID
SSH_AUTH_SOCK
SSH_CLIENT
SSH_CONNECTION
SSH_TTY
DISPLAY
possibly LANG LC_* TZ

all come to mind.

Likely the best approach is to be able to somehow (from within the
screen session)
be able to dump the environment as it was when the session was (re)attached to.

I could imagine a bash PROMPT_COMMAND running something like

$(screen -dump-vars DISPLAY,SSH_TTY)

which would execute

export DISPLAY=X
unset SSH_TTY

or something roughly like that...



On Tue, Jul 2, 2013 at 4:04 AM, Timothy Normand Miller
<address@hidden> wrote:
> Awesome.  Thanks!
>
> Yeah, I can see how this might be done manually, but an automatic solution
> built into screen would really convenient.
>
>
> On Tue, Jul 2, 2013 at 3:50 AM, Juergen Weigert <address@hidden> wrote:
>>
>> Ssh has an implementation for this. It requires proxying. If we have a
>> developer for this, I can give some coaching.
>>
>> Cheers, JW
>>
>>
>>
>> Timothy Miller <address@hidden> schrieb:
>>>
>>> URL:
>>> <http://savannah.gnu.org/bugs/?39389&gt;
>>>
>>>
>>> Summary: "screen -r" should optionally pick up X11 DISPLAY
>>> variable from environment
>>> Project: GNU Screen
>>> Submitted by: theosib
>>> Submitted on: Tue 02 Jul 2013 01:36:01 AM GMT
>>> Category: Feature Request
>>>
>>> Severity: 3 - Normal
>>> Priority: 5 - Normal
>>> Status: None
>>> Privacy: Public
>>> Assigned to: None
>>> Open/Closed: Open
>>> Discussion Lock: Any
>>> Release: None
>>> Fixed Release: None
>>> Planned Release: None
>>> Work Required: None
>>>
>>>
>>> ________________________________
>>>
>>>
>>> Details:
>>>
>>> This is apparently a common problem that lots of people complain about:
>>> A
>>> user reconnects to an old screen session, but they can't run X11 apps,
>>> because
>>> the DISPLAY variable in the session is stale.
>>>
>>>
>>> I notice that gnu
>>>  screen
>>> correctly picks up the terminal size, type, and
>>> attributes from the environment.  So I don't see why the same can't be
>>> done
>>> with the X11 DISPLAY variable.  (Although there perhaps should be a
>>> command
>>> line option for screen to do this, in case the user really wants DISPLAY
>>> to be
>>>
>>> something different.)
>>>
>>>
>>>
>>>
>>>
>>> ________________________________
>>>
>>>
>>> Reply to this item at:
>>>
>>> <http://savannah.gnu.org/bugs/?39389&gt;
>>>
>>>
>>> ________________________________
>>>
>>> Message sent via/by Savannah
>>> http://savannah.gnu.org/
>>>
>>>
>>
>> --
>> Diese Nachricht wurde von meinem Android-Mobiltelefon mit K-9 Mail
>> gesendet.
>
>
>
>
> --
> Timothy Normand Miller, PhD
> Assistant Professor of Computer Science, Binghamton University
> http://www.cs.binghamton.edu/~millerti/
> Open Graphics Project