Re: Mir in a virtual machine

[Rian Quinn]

I would prefer to run the server as non-root, but if I attempt to do that, it complains about not being able to open the DRM device. If I run the fingerprint demo as non-root, and the server as root, the client complains about not being able to make a connection to the server. And some of the clients I cannot get to connect at all regardless of root or not (like all of the EGL examples). 

I am a little confused though. If Mir is to replace X someday, clients will have to be able to be run as non-root. The ideal solution is where both the server/compositor, and clients are running as non-root which is one of the things that X doesn’t do today. Are there plans to fixing the privilege issue (everything needing root), or am I not understanding something. 

Thanks

- Rian

On Jan 22, 2014, at 9:35 PM, Daniel van Vugt <daniel.van.v...@canonical.com> wrote:

Q: Does Mir support multiple monitors? If so, do you have any examples
or at least a starting point on how to set that up.
A: Yes... The API for affecting the multi-monitor config is
mir_connection_create_display_config
mir_connection_apply_display_config
etc.. http://unity.ubuntu.com/mir/group__mir__toolkit.html
To enable basic multi-monitor testing you can:
mir_demo_server_shell --display-config sidebyside
Mir's multi-monitor configuration is already used in detail by XMir.
That's how you can configure displays from X under XMir.

Q: How does Mir handle surfaces with shapes cut out of them. For
example, a smiley face where the background is shown through the eyes
and mouth.
A: Create your surface with an alpha channel (e.g.
mir_pixel_format_abgr_8888) and then any pixels with alpha==0 will be
transparent. As an example of a free-form shape, you can run:
mir_demo_client_egltriangle -b 0.0

Q: Do clients need to have root access. For the fingerprint test, I
could not get it to run without a sudo.
A: Yes and no. A client can run as the same user as the server,
including non-root. This works perfectly for touch (Android) devices
however desktop has the problem of requiring root to access input
devices. You can run mir server and client on desktop as non-root but
you won't be able to interact with it.

On 23/01/14 01:21, Rian Quinn wrote:

Daniel,

I was able to update my system, and my sources and was able to get Mir
up and running.

I am actually really impressed with the Mir source code. We were
considering writing a lot of this ourselves, but I think that Mir has
everything that we need already.

I do have a couple of questions.
- Does Mir support multiple monitors? If so, do you have any examples or
at least a starting point on how to set that up.
- How does Mir handle surfaces with shapes cut out of them. For example,
a smiley face where the background is shown through the eyes and mouth.
- Do clients need to have root access. For the fingerprint test, I could
not get it to run without a sudo.

Thanks,
- Rian

For others interested in how I got Mir up and running, here were my steps:

1:
Install the 3.13 linux kernel. Here is what I used for that:
http://linuxg.net/how-to-install-kernel-3-13-rc-7-on-ubuntu-linux-mint-pear-os-and-elementary-os/

2:
Install libDRM from the following PPA:
https://launchpad.net/~oibaf/+archive/graphics-drivers/

3:
run sudo apt-get build-dep mir

4:
Download and compile Mir form the following:
http://unity.ubuntu.com/mir/building_source_for_pc.html

5:
Download and compile Mir's version of Mesa and here are the compilation
steps:
http://www.mesa3d.org/install.html

I had to add --disable-dri3 to get it to compile, plus the
--with-egl-platform=mir,drm

Once I was done with that, I could get the examples to execute.

On Tue, Jan 21, 2014 at 8:44 PM, Daniel van Vugt
<daniel.van.v...@canonical.com <mailto:daniel.van.v...@canonical.com>>
wrote:

Rian,

VMware (Thomas Hellstrom) has implemented Mir support. Apparently
you need kernel 3.13 for the requisite graphics driver DRM changes.
And you need a newish Mesa.

I don't think anyone has documented the particulars yet. But we
certainly should at least by the time regular Ubuntu (trusty?) has
all the prerequisites in place.

- Daniel

On 22/01/14 05:08, Rian Quinn wrote:

Is it possible to get Mir up and running in a Virtual Machine. I
have
both VMWare and VirtualBox. Currently, under VMWare, you get an
error
about open_drm_device. Basically, I am working with Mir for some
client
/ server development, and would like to do testing in a virtual
machine
to start.

Thanks,
- Rian

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