bug-report: Screenshot.png is not an image

[stdedos]

From r25468:

$ file Screenshot.png 
Screenshot.png: ASCII text, with very long lines, with no line terminators
$ head -c 20 Screenshot.png ; echo
b'\x89PNG\r\n\x1a\n\
$ 

xpra info "collected" via right-click menu on Windows 10

[Antoine Martin]

I think I know where the problem is.
The usual strings vs bytes python nonsense.

[Antoine Martin]

Hmmm. No.
I can't reproduce the problem. Please attach the file.

Please specify the exact versions used at both ends, as well as the distro version.

[stdedos]

Server: Xenial / r25174, Client: Win10 / r25468

Screenshot is not really needed. If I do:

a = b'\x89PNG\r\n\x1a\n\x00\x00\x00\rIHDR....'
with open('Screenshot.png', 'wb') as f:
    f.write(a)

It will save the screenshot as expected (It will take some time to paste 450kb chars in the terminal, but it will happen).

[Antoine Martin]

I cannot reproduce any problems.
Tested with 3.0.6-r25174 on a Xenial server and win10 client as well as xenial client.

Tested with python2 and python3 versions of the client and server.

You must have left some important detail out. For a start, the python version(s) used and the exact command lines.

[stdedos]

I don't know if you checked - does this help? attachment/ticket/2618/xpra-2618-info.zip

I opened this as a consequence of #2618.

[Antoine Martin]

I don't know if you checked - does this help? attachment/ticket/2618/xpra-2618-info.zip

No. But this would:

You must have left some important detail out.
For a start, the python version(s) used and the exact command lines.

[stdedos]

xpra-info collected from this session:

"Xpra-Python3-x86_64_4.0-r25519\xpra_cmd" attach ssh://user@ip/0 --ssh="plink -ssh -agent" --keyboard-layout=us --keyboard-layouts=us,gr --opengl=no --min-quality=20 --desktop-scaling=0.75

2020-03-05 20:53:24,914 Xpra GTK3 client version 4.0-r25519 64-bit
2020-03-05 20:53:24,916  running on Microsoft Windows 10
2020-03-05 20:53:24,978 Warning: failed to import opencv:
2020-03-05 20:53:24,979  No module named 'cv2'
2020-03-05 20:53:24,979  webcam forwarding is disabled
2020-03-05 20:53:26,055 GStreamer version 1.16.2 for Python 3.8.2 64-bit
2020-03-05 20:53:26,557 keyboard layout code 0x409
2020-03-05 20:53:26,559 identified as 'United States - English' : us
2020-03-05 20:53:27,110  keyboard settings: layout=us
2020-03-05 20:53:27,115  desktop size is 1600x900 with 1 screen:
2020-03-05 20:53:27,116   Default (423x238 mm - DPI: 96x96) workarea: 1600x860
2020-03-05 20:53:27,117     (Standard monitor types) Generic PnP Monitor (309x174 mm - DPI: 131x131)
2020-03-05 20:53:27,117  downscaled to 75%, virtual screen size: 2133x1200
2020-03-05 20:53:27,118   Default (423x238 mm - DPI: 128x128) workarea: 2133x1147
2020-03-05 20:53:27,120     (Standard monitor types) Generic PnP Monitor (309x174 mm - DPI: 175x175)
2020-03-05 20:53:35,019 enabled remote logging
2020-03-05 20:53:35,032 Xpra GTK3 shadow server version 3.0.6-r25174 64-bit
2020-03-05 20:53:35,035  running on Linux Ubuntu 16.04 xenial
2020-03-05 20:53:35,038  remote desktop size is 6400x1440
2020-03-05 20:53:35,060 Attached to 172.16.57.121:22
2020-03-05 20:53:35,069  (press Control-C to detach)


(xpra_cmd:8268): Pango-WARNING **: 20:53:35.748: couldn't load font "Bitstream Vera Sans Not-Rotated 14.662109375", falling back to "Sans Not-Rotated 14.662109375", expect ugly output.
2020-03-05 20:53:36,795 UI thread is now blocked
2020-03-05 20:53:37,462 UI thread is running again, resuming
[...]
2020-03-05 23:10:04,688 server is not responding, drawing spinners over the windows
2020-03-05 23:10:05,078 server is OK again
2020-03-05 23:10:19,892 Warning: long timer waiting time,
2020-03-05 23:10:19,900  UI thread polling waited 1.3 seconds longer than intended (1.8 vs 0.5)
2020-03-05 23:10:27,043 unknown string message: 0xc2aa / 0x220550 / 0x2
2020-03-05 23:11:20,709 Warning: long timer waiting time,
2020-03-05 23:11:20,718  UI thread polling waited 1.7 seconds longer than intended (2.2 vs 0.5)
2020-03-05 23:11:20,939 server is not responding, drawing spinners over the windows
2020-03-05 23:11:21,513 server is OK again
2020-03-05 23:12:11,354 unknown string message: 0xc286 / 0x0 / 0x0
2020-03-05 23:12:21,373 unknown string message: 0xc286 / 0x0 / 0x0
2020-03-05 23:13:36,235 unknown string message: 0xc286 / 0x0 / 0x0
2020-03-05 23:14:58,893 server is not responding, drawing spinners over the windows
2020-03-05 23:14:59,147 server is OK again
2020-03-05 23:15:05,761 unknown string message: 0xc286 / 0x0 / 0x0

Right-click on tray > Information > Bug Report > Save: and I got attachment/ticket/2621/xpra-2620-test.zip

Then, to "render" the image (included in the attachment):

Simply prepend SCREEN = to the file and then:

In [1]: exec(open('Screenshot.png.txt').read())                                                                                                                                 

In [2]: with open('Screenshot.png', 'wb') as f: 
   ...:     f.write(SCREEN) 
   ...:                                                                                                                                                                         

---

Also also, while checking (in the server) that the file is "rendered" correctly:

$ xdg-open Screenshot.png
xdg-open: failed to forward to xpra server using socket '/run/user/1000/xpra/usr-2': write() argument must be str, not bytes

And the image opened remotely

[Antoine Martin]

And... the bit I was missing is that you're using the bug report tool with python3 and not the xpra screenshot command.

The fix is in r25535.
Backport in r25536.

[migration script]

this ticket has been moved to: ​https://github.com/Xpra-org/xpra/issues/2621