bug#47106: Bubblewrap hates Guix containers 😞

[Leo Prikler <leo.prikler@student.tugraz.at>]

Hi!
Am Samstag, den 13.03.2021, 11:48 +0100 schrieb Ludovic Courtès:
> Hi!
> 
> Leo Prikler <leo.prikler@student.tugraz.at> skribis:
> 
> > both Epiphany and Eolie (post fixing #47097; will submit patch
> > shortly)
> > fail inside Guix containers with the suggested incantation.  After
> > getting the environment to no longer complain about $DISPLAY by
> > adding
> > `--preserve="XAUTHORITY" --expose=$XAUTHORITY', it repeatedly
> > outputs
> > lines like
> > bwrap: Can't find source path /sys/class: No such file or directory
> > before closing the process altogether.
> 
> What is ‘bwrap’ looking for?  /sys is mounted inside ‘guix
> environment -C’,
> but perhaps it needs something special?
> 
> I suggest running these things (or ‘bwrap’ directly) in ‘strace -f -o
> log’ inside the container to see.
It seems to be 
> openat(AT_FDCWD, "/sys/class/dmi/id/chassis_type", O_RDONLY) = -1
> ENOENT (No such file or directory)
> openat(AT_FDCWD, "/sys/firmware/acpi/pm_profile", O_RDONLY) = -1
> ENOENT (No such file or directory)

I haven't repeated that for all warnings of similar kind, but if I add
`--expose=/sys/block --expose=/sys/class --expose=/sys/bus --
expose=/sys/dev --expose=/sys/devices` to the invocation, I instead get
a warning, that the WebKitWebProcess can't open $DISPLAY.  I'm not sure
how to resolve that one, given that I already had to sneak DISPLAY and
XAUTHORITY into the container, but it's a start.

Regards,
Leo