Installing ubuntu-core snap inside a LXD container fails

[Mark Shuttleworth]

On 07/06/16 23:14, Claudio André wrote:
> 2016-06-07 9:37 GMT-03:00 Sujeevan (svij)
> Vijayakumaran <svij at ubuntu.com <mailto:svij at ubuntu.com>>: 
>
>     > That's because snapd tickles the kernel in a way that blows[...]
>
>
> That is interesting. Where I can find more about the 'tickles'? My
> motivation:
> - I'm seeing closed source software behaves badly, e.g, AMD software
> prints.
>
>   Internal Error:  as failed
>   Codegen phase failed compilation.
>
> If I know what the  'tickles' mean, I might be able to do something.  
> Thanks.

I think it has to do with nesting kernel structures related to security
(LXD sets those up, then snapd wants to tweak them again), but a much
clearer answer would come from Stephane cc'd.

Mark


>
> 2016-06-07 8:41 GMT-03:00 Sujeevan (svij) Vijayakumaran
> <svij at ubuntu.com <mailto:svij at ubuntu.com>>:
>
>     Hello!
>
>     I'm trying to install a snap inside a freshly created LXD container,
>     which isn't possible:
>
>     -----
>     ubuntu at snap-test:~$ sudo snap install
>     taskwarrior_2.5.1-snap0_amd64.snap
>     64.75 MB / 64.75 MB
>     [========================================================================]
>     100.00 % 5.38 MB/s
>
>     error: cannot perform the following tasks:
>     - Mount snap "ubuntu-core" ([start snap-ubuntu\x2dcore-122.mount]
>     failed
>     with exit status 1: Job for snap-ubuntu\x2dcore-122.mount failed. See
>     "systemctl status "snap-ubuntu\\x2dcore-122.mount"" and
>     "journalctl -xe"
>     for details.
>     )
>     ubuntu at snap-test:~$ systemctl status "snap-ubuntu\\x2dcore-122.mount"
>     ● snap-ubuntu\x2dcore-122.mount - Squashfs mount unit for ubuntu-core
>        Loaded: loaded (/etc/systemd/system/snap-ubuntu\x2dcore-122.mount;
>     enabled; vendor preset: enabled)
>        Active: failed (Result: exit-code) since Tue 2016-06-07
>     11:32:13 UTC;
>     16s ago
>         Where: /snap/ubuntu-core/122
>          What: /var/lib/snapd/snaps/ubuntu-core_122.snap
>       Process: 8584 ExecMount=/bin/mount
>     /var/lib/snapd/snaps/ubuntu-core_122.snap /snap/ubuntu-core/122
>     (code=exited, status=32)
>
>     Jun 07 11:32:13 snap-test systemd[1]: Mounting Squashfs mount unit for
>     ubuntu-core...
>     Jun 07 11:32:13 snap-test mount[8584]: mount: /snap/ubuntu-core/122:
>     mount failed: Unknown error -1
>     Jun 07 11:32:13 snap-test systemd[1]: snap-ubuntu\x2dcore-122.mount:
>     Mount process exited, code=exited status=32
>     Jun 07 11:32:13 snap-test systemd[1]: Failed to mount Squashfs mount
>     unit for ubuntu-core.
>     Jun 07 11:32:13 snap-test systemd[1]: snap-ubuntu\x2dcore-122.mount:
>     Unit entered failed state.
>     ------
>
>     It works fine if it's not inside a LXD container. Is this an issue
>     with
>     LXD or with snapd or am I missing something?
>
>     Also: Why is there an "ugly" \x2d (which seems to be a hypen-minus) in
>     the systemd-file rather than a "normal" minus?
>
>     Cheers,
>     Sujeevan
>
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