Re: [PATCH 0/4] fix depvpts in user namespaces

[Glauber Costa <glommer-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>]

On 03/15/2013 07:58 PM, Serge Hallyn wrote:
> Quoting Glauber Costa (glommer-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org):
>> On 03/15/2013 07:21 PM, Serge Hallyn wrote:
>>> Quoting Glauber Costa (glommer-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org):
>>>> On 03/15/2013 06:00 PM, Serge Hallyn wrote:
>>>>> Quoting Eric W. Biederman (ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org):
>>>>>> Glauber Costa <glommer-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org> writes:
>>>>>>
>>>>>>> Hi,
>>>>>>>
>>>>>>> devpts mounts in user namespaces is queued for 3.9. However, while playing
>>>>>>> with it I found it to be less than ideal. Although it could possibly work
>>>>>>> with custom software that can be made to point to /dev/pts/ptmx, a few things
>>>>>>> prevent it from working correctly for people that, like us, are booting full
>>>>>>> distributions.
>>>>>>
>>>>>> Full distributions that have not been modified to be minimally container
>>>>>> aware.
>>>>>
>>>>> Right, in fact in this case it doesn't need to be minimally container
>>>>> aware, you just create the bind mount yourself and init just needs to
>>>>> accept that it shouldn't touch it.
>>>>>
>>>>
>>>> Well, what if it doesn't?
>>>>
>>>> At least in the system I am using, centos6, udev mounts a tmpfs in a
>>>> temporary location, and then mount --move this to /dev. This is now
>>>> empty, and devpts will be mounted ontop of that.
>>>
>>> This also messes up your /dev/ttyN setup right?  How are you handling
>>> that?
>>>
>> very simple: udev will just mknod everything back, so let him!
> 
> So you're not using bind-mounted ptys over /dev/ttyN?
> 
Not in particular, and I haven't felt the need yet.