Re: environment --container not working after upgrading Ubuntu

[Ludovic Courtès]

Ben Woodcroft <address@hidden> skribis:

> On 01/05/16 22:17, Thompson, David wrote:
>> On Sat, Apr 30, 2016 at 8:17 PM, Ben Woodcroft <address@hidden> wrote:
>>> Hi,
>>>
>>> I upgraded to the just-released Ubuntu Xenial yesterday, seems nice and
>>> snappy. The only issue I've had with it so far is that 'guix environment
>>> --container' run from a git checkout doesn't work. There's no error given,
>>> it simply exits:
>>>
>>> $ ./pre-inst-env guix environment --container coreutils
>>> [..]
>>> $ echo $?
>>> 1
>>>
>>> Any ideas on debugging this? I tried 'make clean; make'. My daemon is a
>>> little out of date, but it was working before the upgrade.
>> Could you prefix that command with 'strace -f -o /tmp/container.log'
>> and send the generated log file?  This way we'll see the system calls
>> that are failing.
>
> OK, attached. My guess from that is that it may be due to my also
> updating my ~/.guix-profile recently, come to think of it.
>
> Should I re-configure? I would go ahead, but want to check in case
> this is a valuable test case.

[...]

> 31711 mkdir("/tmp/guix-directory.6TJ2u4/dev/mqueue", 0775) = 0
> 31711 mount("mqueue", "/tmp/guix-directory.6TJ2u4//dev/mqueue", "mqueue", 
> MS_NOSUID|MS_NODEV|MS_NOEXEC, NULL) = -1 EBUSY (Device or resource busy)

So this is the root of the problem.

I looked at mq_overview(7) but didn’t find any clue as to when it could
fail to mount with EBUSY.  Dave, any ideas?

Thanks,
Ludo’.