bug#59069: `guix shell -CN' failed to access GPU

[dan]

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I was trying to run some GUI software in a guix container, and would like to 
have GPU access in it.  However, I later found out that if I gave network 
access to the container, it seems like unable to properly find the GPU.  The 
following are the commands that I run and the output I got:

- 
------------------------------without-network-access------------------------------

$ guix shell -C mesa-utils --expose=/tmp/.X11-unix --expose=$XAUTHORITY 
--expose=/dev/dri --expose=/etc/udev -E "DISPLAY|XAUTHORITY" -- glxinfo -B

name of display: :1
display: :1  screen: 0
direct rendering: Yes
Extended renderer info (GLX_MESA_query_renderer):
    Vendor: AMD (0x1002)
    Device: AMD RENOIR (DRM 3.47.0, 5.19.15, LLVM 11.0.0) (0x1638)
    Version: 21.3.8
    Accelerated: yes
    Video memory: 1024MB
    Unified memory: no
    Preferred profile: core (0x1)
    Max core profile version: 4.6
    Max compat profile version: 4.6
    Max GLES1 profile version: 1.1
    Max GLES[23] profile version: 3.2
Memory info (GL_ATI_meminfo):
    VBO free memory - total: 655 MB, largest block: 655 MB
    VBO free aux. memory - total: 15305 MB, largest block: 15305 MB
    Texture free memory - total: 655 MB, largest block: 655 MB
    Texture free aux. memory - total: 15305 MB, largest block: 15305 MB
    Renderbuffer free memory - total: 655 MB, largest block: 655 MB
    Renderbuffer free aux. memory - total: 15305 MB, largest block: 15305 MB
Memory info (GL_NVX_gpu_memory_info):
    Dedicated video memory: 1024 MB
    Total available memory: 16487 MB
    Currently available dedicated video memory: 655 MB
OpenGL vendor string: AMD
OpenGL renderer string: AMD RENOIR (DRM 3.47.0, 5.19.15, LLVM 11.0.0)
OpenGL core profile version string: 4.6 (Core Profile) Mesa 21.3.8
OpenGL core profile shading language version string: 4.60
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile

OpenGL version string: 4.6 (Compatibility Profile) Mesa 21.3.8
OpenGL shading language version string: 4.60
OpenGL context flags: (none)
OpenGL profile mask: compatibility profile

OpenGL ES profile version string: OpenGL ES 3.2 Mesa 21.3.8
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.20
- 
------------------------------with-network-access------------------------------

$ guix shell -CN mesa-utils --expose=/tmp/.X11-unix --expose=$XAUTHORITY 
--expose=/dev/dri --expose=/etc/udev -E "DISPLAY|XAUTHORITY" -- glxinfo -B

name of display: :1
libGL error: MESA-LOADER: failed to retrieve device information
libGL error: MESA-LOADER: failed to open amdgpu: 
/gnu/store/83kzrpczis5s8hn3ly9y89mij7ngq4bw-mesa-21.3.8/lib/dri/amdgpu_dri.so: 
cannot open shared object file: No such file or directory (search paths 
/gnu/store/83kzrpczis5s8hn3ly9y89mij7ngq4bw-mesa-21.3.8/lib/dri, suffix _dri)
libGL error: failed to load driver: amdgpu
libGL error: MESA-LOADER: failed to retrieve device information
libGL error: MESA-LOADER: failed to open amdgpu: 
/gnu/store/83kzrpczis5s8hn3ly9y89mij7ngq4bw-mesa-21.3.8/lib/dri/amdgpu_dri.so: 
cannot open shared object file: No such file or directory (search paths 
/gnu/store/83kzrpczis5s8hn3ly9y89mij7ngq4bw-mesa-21.3.8/lib/dri, suffix _dri)
libGL error: failed to load driver: amdgpu
display: :1  screen: 0
direct rendering: Yes
Extended renderer info (GLX_MESA_query_renderer):
    Vendor: Mesa/X.org (0xffffffff)
    Device: llvmpipe (LLVM 11.0.0, 256 bits) (0xffffffff)
    Version: 21.3.8
    Accelerated: no
    Video memory: 30926MB
    Unified memory: no
    Preferred profile: core (0x1)
    Max core profile version: 4.5
    Max compat profile version: 4.5
    Max GLES1 profile version: 1.1
    Max GLES[23] profile version: 3.2
OpenGL vendor string: Mesa/X.org
OpenGL renderer string: llvmpipe (LLVM 11.0.0, 256 bits)
OpenGL core profile version string: 4.5 (Core Profile) Mesa 21.3.8
OpenGL core profile shading language version string: 4.50
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile

OpenGL version string: 4.5 (Compatibility Profile) Mesa 21.3.8
OpenGL shading language version string: 4.50
OpenGL context flags: (none)
OpenGL profile mask: compatibility profile

OpenGL ES profile version string: OpenGL ES 3.2 Mesa 21.3.8
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.20
- ------------------------------paste-ends-here------------------------------

The only difference between these two executions are the `-N' flag.  I also had 
a look at the related guile code, and it seems like the `-N' flag is only doing 
two things:
  1. bind several network related files to /etc
  2. share network namespace to the container

I've had a few other guix users tested the commands, and they reported the 
similar results.

Some info about my environment:
kernel version: 6.0.7
mesa   version: 21.3.8

- -- 
dan
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