[winswitch] How to install local unprivileged Xpra server?

Antoine Martin antoine at nagafix.co.uk
Thu Jan 25 04:47:10 GMT 2018 

> I tried building without Xdummy and ended up with a different error.
> Here is what I did:
> rm -r ~/bin/xpra-2.2.3/
> ./setup.py --without-Xdummy install --home=/home/bmishkania/bin/xpra-2.2.3/
> xpra start --start=~/bin/firefox/firefox --daemon=no
> 
> It prints this:
> 2018-01-24 20:03:58,708 cannot access python uinput module:
> 2018-01-24 20:03:58,708  No module named uinput
> xpra main error:
> Traceback (most recent call last):
(..)
> OSError: [Errno 9] Bad file descriptor
This error message has now been improved:
http://xpra.org/trac/changeset/18147

> xpra initialization error:
>  xpra_Xdummy: did not provide a display number using displayfd
Based on this message, I'm not convinced that you are actually using
xvfb. Double-check your configuration with:
xpra showconfig | grep -i ^xvfb

> I do not think Xvfb is installed on this system, even though Xorg is.
The xorg-x11-server-Xvfb package on CentOS / RHEL 7.x only contains one
binary file named "Xvfb". You can just unpack the RPM by hand and put
the binary in your $PATH. The dependencies should already be present if
you have /usr/bin/Xorg installed.

> As
> an unprivileged user it may be hard for me to install Xvfb, so could
> there be a different solution?
Yes, figure out why you get those tty errors when running xpra_Xdummy.
Regular CentOS 7.x systems can normally run it just fine.

Cheers
Antoine

> 
> Thanks,
> Ben
> 
> ------------------------------------------------------------------------
> *From:* Antoine Martin <antoine at nagafix.co.uk>
> *Sent:* Wednesday, January 24, 2018 1:26 AM
> *Cc:* Ben Mishkanian; Xpra and Winswitch ML
> *Subject:* Re: [winswitch] How to install local unprivileged Xpra server?
>  
> Please always CC the mailing list.
> 
> On 24/01/18 13:39, Ben Mishkanian wrote:
>> Thank you for the quick response!
>> 
>> 
>> It is CentOS 7.4.1708. You're right, I used the wrong PYTHONPATH. Oops.
>> It allows server commands now, but now there's a new error. Here is what
>> I did:
>> 
>> 
>> ./setup.py -v install --home=/home/bmishkania/bin/xpra-2.2.3/
>> 
>> export PYTHONPATH=/home/bmishkania/bin/xpra-2.2.3/lib64/python:$PYTHONPATH
>> 
>> xpra start --start=~/bin/firefox/firefox
> This should not work unless you've also installed xpra somewhere on the
> $PATH or modified $PATH.
> You could also use the path to somewhere/install/bin/xpra directly.
> 
>> It prints:
>> 
>> Warning: cannot use the system proxy for 'start' subcommand,
> Harmless warning, you don't have a system service, it will fallback to
> self-daemonizing.
> 
>>  failed to connect to '/run/xpra/system':
>>  [Errno 2] No such file or directory
> Harmless warning because you are missing the tmpfiles.d bits.
> 
>> Entering daemon mode; any further errors will be reported to:
>>   /run/user/109999/xpra/S12370.log
>> 
>> Here is the log file:
>> 2018-01-23 22:12:33,912 cannot access python uinput module:ESC[0m
>> 2018-01-23 22:12:33,912  No module named uinputESC[0m
> Harmless, you don't have uinput installed. You wouldn't be able to use
> it anyway without the system service without also modifying the device
> permissions.
> 
>> Failed to rename log file "/run/user/109999/xpra/Xorg.S12370.log" to
>> "/run/user/109999/xpra/Xorg.S12370.log": No such file or directory
> Harmless, that's a known Xorg bug languishing upstream.
> 
>> X.Org X Server 1.19.3
>> Release Date: 2017-03-15
>> X Protocol Version 11, Revision 0
>> Build Operating System:  3.10.0-514.16.1.el7.x86_64
>> Current Operating System: Linux ussd-prd-rdln01
>> 3.10.0-693.5.2.el7.x86_64 #1 SMP Fri Oct 20 20:32:50 UTC 2017 x86_64
>> Kernel command line: BOOT_IMAGE=vmlinuz initrd=initrd
>> rdblacklist=nouveau net.ifnames=0 biosdevname=0 user_namespace.enable=1
>> mlx4_core.port_type_array=2,2
>> ip=10.12.144.15:10.12.144.11:10.12.144.1:255.255.252.0
>> BOOTIF=01-0c-c4-7a-1d-ae-de
>> Build Date: 05 August 2017  06:19:43AM
>> Build ID: xorg-x11-server 1.19.3-11.el7
>> Current version of pixman: 0.34.0
>>         Before reporting problems, check http://wiki.x.org
>>         to make sure that you have the latest version.
>> Markers: (--) probed, (**) from config file, (==) default setting,
>>         (++) from command line, (!!) notice, (II) informational,
>>         (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
>> (++) Log file: "/run/user/109999/xpra/Xorg.S12370.log", Time: Tue Jan 23
>> 22:12:34 2018
>> (++) Using config file:
>> "/home/bmishkania/bin/localPython/etc/xpra/xorg.conf"
>> (==) Using system config directory "/usr/share/X11/xorg.conf.d"
>> (EE)
>> Fatal server error:
>> (EE) parse_vt_settings: Cannot open /dev/tty0 (Permission denied)
>> (EE)
>> (EE)
>> Please consult the The X.Org Foundation support
>>          at http://wiki.x.org
>>  for help.
>> (EE) Please also check the log file at
>> "/run/user/109999/xpra/Xorg.S12370.log" for additional information.
>> (EE)
>> (EE) Server terminated with error (1). Closing log file.
>> xpra initialization error:
>>  xpra_Xdummy: did not provide a display number using displayfd
> xpra_Xdummy failed to run, there could be a number of reasons for that.
> The easiest fix for you might just be to switch to Xvfb:
> ./setup.py --without-Xdummy install --home=....
> 
> Cheers
> Antoine
> 
>> 
>> 
>> Any ideas how I can fix this?
>> 
>> Thank you,
>> Ben
>> 
>> ------------------------------------------------------------------------
>> *From:* shifter-users <shifter-users-bounces at lists.devloop.org.uk> on
>> behalf of Antoine Martin via shifter-users
>> <shifter-users at lists.devloop.org.uk>
>> *Sent:* Tuesday, January 23, 2018 9:57 PM
>> *To:* shifter-users at lists.devloop.org.uk
>> *Subject:* Re: [winswitch] How to install local unprivileged Xpra server?
>>  
>> On 24/01/18 12:47, Ben Mishkanian via shifter-users wrote:
>>> Hi,
>>> 
>>> 
>>> I am trying to build and install from source an Xpra 2.2.3 server as an unprivileged user on CentOS 7. I ran setup.py and it seems to complete fine, although it prints a bunch of brotli errors saying it failed to minify various files.
>> You can ignore those errors or turn off the brotli feature, see:
>> ./setup.py --help
>> 
>>> In any case it produces the xpra binary, but when I run `xpra -h` it says (This xpra installation does not support starting local servers.)
>> Please always include the exact command lines that you have used so we
>> can help you with that.
>> Also specify which CentOS 7 you are using, CentOS versions older than
>> 7.2 are not supported in xpra versions 2.x and later, see:
>> https://www.xpra.org/trac/wiki/Platforms
> Platforms – Xpra <https://www.xpra.org/trac/wiki/Platforms>
> www.xpra.org
> Platforms. Unless otherwise stated, all the operating systems listed
> here support all versions of xpra. The only architectures officially
> tested and supported are ...
> 
> 
> 
>> Platforms – Xpra <https://www.xpra.org/trac/wiki/Platforms>
> Platforms – Xpra <https://www.xpra.org/trac/wiki/Platforms>
> www.xpra.org
> Platforms. Unless otherwise stated, all the operating systems listed
> here support all versions of xpra. The only architectures officially
> tested and supported are ...
> 
> 
> 
>> www.xpra.org <http://www.xpra.org>
> xpra home page <http://www.xpra.org/>
> www.xpra.org
> About. Xpra is an open-source multi-platform persistent remote display
> server and client for forwarding applications and desktop screens. It
> gives you remote access ...
> 
> 
> 
>> Platforms. Unless otherwise stated, all the operating systems listed
>> here support all versions of xpra. The only architectures officially
>> tested and supported are ...
>> 
>> 
>> 
>> 
>> Be aware that your home made build will be severely degraded and may not
>> work as expected. (performance, features, security, etc)
>> 
>>> How can I find out why it can't start local servers? setup.py showed that the "server" build switch is set to "Y".
>> My guess is that you're not setting the PYTHONPATH correctly.
>> You should be installing into a directory:
>> ./setup.py install --home=./install
>> Then adjusting PATH and PYTHONPATH accordingly.
>> 
>> Cheers
>> Antoine
>>> Thank you,
>>> 
>>> Ben
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