Default print screen location: Dom0 ...?

emma.li...@gmail.com

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Apr 13, 2016, 7:37:57 AM4/13/16

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Hi,
when I do a print screen of something happening in the personal domain, the default place it is saved is Dom0. I would expect it to end up in the appvm that is being print screened instead. Is this a bug or a feature?

Zrubi

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Apr 13, 2016, 7:55:51 AM4/13/16

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Feature. :)

Your question clearly shows that you are not aware of how Qubes
Seamless GUI are working.

Your GUI (Graphical User Interface) is currently running in dom0.
That's means all the screens are handled by dom0. For this reason the
screen capture program is also have to be running in dom0.

Actually your AppVM's have no screens at all. They only able to
provide the content of an application window - draw by the dom0
desktop environment. They not even able to modify the decoration of
such a window...

You can read more about this here:
https://www.qubes-os.org/doc/gui/

- --
Zrubi
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Desobediente

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Apr 13, 2016, 8:13:19 AM4/13/16

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I'm gonna use this same topic.

What if i want to use recordmydesktop or anything similar?

I am interested strictly in video recording / screen capture, but also, how would audio work?

I have tried (before I've RTFM) to run recordmydesktop "inside" an AppVM, that obviously crapped the whole screeen.

Tags: recordmydesktop, screen record, screen capture, how do i, how do one, how do you, video record

Zrubi

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Apr 13, 2016, 8:35:29 AM4/13/16

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On 04/13/2016 02:13 PM, Desobediente wrote:

> What if i want to use recordmydesktop or anything similar?

It is the same as a simple print screen.

You have to install such a software in dom0.
Audio is also handled in dom0 (by default), so it should just work
(however I never tried)

- --
Zrubi
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Axon

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Apr 13, 2016, 9:30:29 AM4/13/16

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emma.li...@gmail.com:

In order to produce a screenshot of something in an AppVM, you can
take the screenshot (from dom0), then copy the image file from dom0 to
one of your AppVMs, as explained here:

https://www.qubes-os.org/doc/copy-to-dom0/

A tool to make this easier is being tracked here:

https://github.com/QubesOS/qubes-issues/issues/953
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Axon

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Apr 13, 2016, 9:39:23 AM4/13/16

to Desobediente, qubes-users

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Desobediente:

> I'm gonna use this same topic.
>
> What if i want to use recordmydesktop or anything similar?
>
> I am interested strictly in video recording / screen capture, but
> also, how would audio work?
>

I've never tried to do this before, but if I were going to, I'd try
giving an HVM fullscreen permissions, then running it in "debug mode"
(i.e., non-seamless mode). Then I'd attach my recording devices to
that HVM and try running the recording software inside of it.

> I have tried (before I've RTFM) to run recordmydesktop "inside" an
> AppVM, that obviously crapped the whole screeen.
>

What do you mean by "crapped the whole screen"? Events which occur in
a single AppVM normally should not be able to affect the entire screen
(as seen from dom0). In fact, this is one of the main security
features of Qubes. See, for example:

https://www.qubes-os.org/doc/full-screen-mode/#tocAnchor-1-1-2

> Tags: recordmydesktop, screen record, screen capture, how do i, how
> do one, how do you, video record
>

Zrubi

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Apr 13, 2016, 9:48:29 AM4/13/16

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On 04/13/2016 03:39 PM, Axon wrote:
> Desobediente:

>> What if i want to use recordmydesktop or anything similar?
>
>> I am interested strictly in video recording / screen capture,
>> but also, how would audio work?
>
>
> I've never tried to do this before, but if I were going to, I'd
> try giving an HVM fullscreen permissions, then running it in "debug
> mode" (i.e., non-seamless mode). Then I'd attach my recording
> devices to that HVM and try running the recording software inside
> of it.

Maybe I'm the one who misunderstood something - but to record your
desktop you do not need any recording device.

I'm used one of the similar tools (don't remember which one) but all
is just as simple as the current screen capture program.(ksnapshot)

1. install it to dom0
2. start it - and configure what you want to capture: single window,
full screen, part of your screen, external monitor, whatever.
The result will be a video file in dom0.

- --
Zrubi
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Axon

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Apr 13, 2016, 12:55:56 PM4/13/16

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Zrubi:

> On 04/13/2016 03:39 PM, Axon wrote:
>> Desobediente:
>>> What if i want to use recordmydesktop or anything similar?
>
>>> I am interested strictly in video recording / screen capture,
>>> but also, how would audio work?
>
>
>> I've never tried to do this before, but if I were going to, I'd
>> try giving an HVM fullscreen permissions, then running it in
>> "debug mode" (i.e., non-seamless mode). Then I'd attach my
>> recording devices to that HVM and try running the recording
>> software inside of it.
>
> Maybe I'm the one who misunderstood something - but to record your
> desktop you do not need any recording device.
>

Ah, perhaps no recording devices are needed, then. (I was thinking of
voice recording being included in the video.)

> I'm used one of the similar tools (don't remember which one) but
> all is just as simple as the current screen capture
> program.(ksnapshot)
>
> 1. install it to dom0 2. start it - and configure what you want to
> capture: single window, full screen, part of your screen, external
> monitor, whatever. The result will be a video file in dom0.
>

I think this could work, but one big drawback would be having to
install/run (probably untrusted) recording software in dom0 as opposed
to a domU.

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Desobediente

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Apr 13, 2016, 1:04:17 PM4/13/16

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2016-04-13 13:55 GMT-03:00 Axon <ax...@openmailbox.org>:

I think this could work, but one big drawback would be having to
install/run (probably untrusted) recording software in dom0 as opposed
to a domU.

That's the one thing I was trying to avoid

--

iuri.neocities.org

Emma Lilliestam

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Apr 14, 2016, 9:18:21 AM4/14/16

to Axon, qubes-users

I do not understand the syntax given in this the copy-to-dom0 document.

The example:
cat /path/to/file_in_dom0 | qvm-run --pass-io <dst_domain> 'cat > /path/to/file_name_in_appvm'

My try:
cat snapshot2.png | qvm-run --pass-io <personal> 'cat > /Documents'

The second path doesn't autocomplete whatever I put in. Clearly, I am missing something.

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Salmiakki

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Apr 14, 2016, 9:29:36 AM4/14/16

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On Thursday, April 14, 2016 at 3:18:21 PM UTC+2, Emma Lilliestam wrote:

I do not understand the syntax given in this the copy-to-dom0 document.

The example:
cat /path/to/file_in_dom0 | qvm-run --pass-io <dst_domain> 'cat > /path/to/file_name_in_appvm'

My try:
cat snapshot2.png | qvm-run --pass-io <personal> 'cat > /Documents'

The second path doesn't autocomplete whatever I put in. Clearly, I am missing something.

It doesn't autocomplete because that path is in a different VM and your shell completion doesn't know about it.
Also leave away the <,> on the domain name.
So
cat snapshot2.png | qvm-run --pass-io personal 'cat > /home/user/Documents/snapshot2.png' or something similar should be right.

Emma Lilliestam

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Apr 14, 2016, 10:10:18 AM4/14/16

to Salmiakki, qubes-users, ax...@openmailbox.org

Thanks! I did exactly that. Did not work. Anyways, this time I get real error messages, which is a step forward.

When I tried with "snapshot2.png" at the end the error message is "no such device or directory". When the path ended with /Documents the error message is "is a directory".

JPL

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Apr 14, 2016, 10:25:08 AM4/14/16

to qubes-users, simonthecr...@gmail.com, ax...@openmailbox.org, emma.li...@gmail.com

Thanks! I did exactly that. Did not work. Anyways, this time I get real error messages, which is a step forward.

When I tried with "snapshot2.png" at the end the error message is "no such device or directory". When the path ended with /Documents the error message is "is a directory".

Are you running the command in the Dom0 directory where snapshot2.png is saved?

Salmiakki

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Apr 14, 2016, 10:41:37 AM4/14/16

to qubes-users, simonthecr...@gmail.com, ax...@openmailbox.org, emma.li...@gmail.com

On Thursday, April 14, 2016 at 4:25:08 PM UTC+2, JPL wrote:

Are you running the command in the Dom0 directory where snapshot2.png is saved?

Indeed that's probably it. So you either need to be in the directory where snapshot2.png is or change the command to

cat /path/to/snapshot2.png | qvm-run --pass-io personal 'cat > /home/user/Documents/snapshot2.png'

And I just noticed you can use a /home/user relative path like this:

cat /path/to/snapshot2.png | qvm-run --pass-io personal 'cat > Documents/snapshot2.png'

But I tried and the command works. ;)

Zrubi

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Apr 14, 2016, 10:49:46 AM4/14/16

to Emma Lilliestam, qubes-users

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On 04/14/2016 03:18 PM, Emma Lilliestam wrote:
> I do not understand the syntax given in this the copy-to-dom0
> document.
>
> |The example: cat /path/to/file_in_dom0 | qvm-run --pass-io
> <dst_domain> 'cat > /path/to/file_name_in_appvm'|
>
> |My try: cat snapshot2.png | qvm-run --pass-io <personal> 'cat >
> /Documents'
>
> |
>
> |The second path doesn't autocomplete whatever I put in. Clearly, I
> am missing something. |

Since 3.1 you can use the qvm-copy-to-vm command from dom0

https://www.qubes-os.org/doc/vm-tools/qvm-copy-to-vm/

The result will be landing in QubesIncoming/dom0/ folder in your
destination VM.

- --
Zrubi
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Axon

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Apr 14, 2016, 6:50:47 PM4/14/16

to Zrubi, Emma Lilliestam, qubes-users

-----BEGIN PGP SIGNED MESSAGE-----
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Zrubi:

> On 04/14/2016 03:18 PM, Emma Lilliestam wrote:
>> I do not understand the syntax given in this the copy-to-dom0
>> document.
>
>> |The example: cat /path/to/file_in_dom0 | qvm-run --pass-io
>> <dst_domain> 'cat > /path/to/file_name_in_appvm'|
>
>> |My try: cat snapshot2.png | qvm-run --pass-io <personal> 'cat >
>> /Documents'
>
>> |
>
>> |The second path doesn't autocomplete whatever I put in. Clearly,
>> I am missing something. |
>
> Since 3.1 you can use the qvm-copy-to-vm command from dom0
>
> https://www.qubes-os.org/doc/vm-tools/qvm-copy-to-vm/
>
> The result will be landing in QubesIncoming/dom0/ folder in your
> destination VM.
>

Thanks. Doc page updated.

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Markus Kilås

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Apr 23, 2016, 4:01:54 PM4/23/16

to qubes-users

Hi,

On a related topic to the one about print screen:
How do you go about performing screen sharing?

Sometimes I need to do online presentations with presentation slides and
live demonstration of my desktop.

Not uncommon is also that this needs to be performed using some
proprietary collaboration tool not of my choice such as Skype for
business (Lync), GotoMeeting, JoinMe, Webex etc.

Installing those applications in dom0 would not be possible and also
definitely not wanted.

Currently to be able to do this I would use an other computer with an
Ubuntu installation + Windows in a VirtualBox VM.

But even with more open solutions that normally should work in
GNU/Linux, like Jitsi or WebRTC applications like Jitsi Meet or Talky
there would still be a problem in Qubes OS if I understand this
correctly because the applications are running in their AppVM and are
thus not able to capture the screen.

What could be possible future ways of sharing a desktop?
Maybe some small app in dom0 that could stream the screen (or parts of
it) to an AppVM which could then somehow make it available to the other
participants...

Cheers,
Markus

Axon

unread,

Apr 24, 2016, 2:35:27 AM4/24/16

to Markus Kilås, qubes-users

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Markus Kilås:

It depends on your needs. If you need to share the screen as it
appears from dom0, then yes, this is going to be a complicated
security issue, since it will require running some software in dom0
and somehow transmitting the images out of dom0.

However, if you can get by with sharing the screen only from a
particular VM, then things are much simpler. You could try running in
non-seamless mode and simply sharing your desktop in that VM as you
would with a conventional OS.
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Franz

unread,

Apr 24, 2016, 12:52:38 PM4/24/16

to Axon, Markus Kilås, qubes-users

What means running in non-seamless mode? I tried to install in a particular VM a program to record a video of what was happing in the screen of that VM and it did not work.

Best

Fran

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Axon

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Apr 24, 2016, 1:53:31 PM4/24/16

to Franz, Markus Kilås, qubes-users

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Franz:

In the VM settings of a Windows HVM, there's an option called
"Seamless GUI." If selected, it will cause each app to have its own
window in dom0. If unselected, the entire Windows VM desktop will
appear in a single window in dom0, with all of that VM's apps inside
of that single window.
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Franz

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Apr 24, 2016, 4:01:10 PM4/24/16

to Axon, Markus Kilås, qubes-users

Ahh ok, It is for Windows HVM. So the best or easier way to share or record a screen is, at least in theory, to use a Windows HVM. Or perhaps even a Linux HVM.

Best

Fran

Markus Kilås

unread,

Apr 25, 2016, 2:54:02 PM4/25/16

to qubes...@googlegroups.com

On 04/24/2016 10:01 PM, Franz wrote:
>
>
> On Sun, Apr 24, 2016 at 2:52 PM, Axon <ax...@openmailbox.org
> <mailto:ax...@openmailbox.org>> wrote:
>
> Franz:

>> On Sun, Apr 24, 2016 at 3:35 AM, Axon <ax...@openmailbox.org <mailto:ax...@openmailbox.org>>

Thank you Axon, Franz,

Yes, I think this should work for my use case. I don't need to capture
different VMs, getting the desktop from one is fine.

I made a first test of this by setting up an Ubuntu HVM and not
selecting seamless mode and I was successful in taking a screen shot
inside the VM using Ubuntu's screen shot app so I think this should work
with other screen capture tools as well.

Next step will be to test that this also works in a Windos HVM and then
see if assigning USB to it works so I can also get audio capturing.

Cheers,
Markus

peter...@gmail.com

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Sep 27, 2018, 6:49:20 AM9/27/18

to qubes-users

Sorry to bump this old thread but as a new qubes user I did try unknowingly to run recordmydesktop in an APPVM.
The result was that the whole screen became white both on external and laptop display. I could see preview screens when alt-tabbing and could exit and reenter from the lock screen that looked normal, but always ended up in the white screen. I needed to perform a hard reboot to recover.

I found below tool for running recordmydesktop in dom0 instead https://git.zx2c4.com/laurent-tools/tree/tools/qvm-screenrecord.sh
I do have problems with many corrupt/lost frames though not sure if that is related to qubes or not.

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