Subject: Re: [vserver] readonly root not working (mkdir(): read-only filesystem on vcontext command)
From: "Daniel Hokka Zakrisson" <daniel@hozac.com>
Date: Mon, 21 Mar 2011 09:28:23 +0100 (CET)

Benjamin Sonntag wrote:
> Hi,
>
>
>> Is there a reason you don't just mkdir .oldroot in your base filesystem?
>>
> yes : in the vcontext.c code, there is :
>
> - mkdir (and if it fail, exit)

Unless it already existed.

> - mount (and if it fail, exit)
> - pivot_root (and if it fail, exit)
> - umount (and if it fail, exit)
> - rmdir (and if it fail, exit)
>
> so ... If I pre-create the .oldroot folder, I still have to patch the code for this
to work,
> and remove both the mkdir and the rmdir

Nope. Just create the directory.

> Since I wanted to make it works for everybody, not only the one using read-only root,
> I proposed this patch which is far better since /var/run is bound to be read-write
anyway.

I have several guests that don't even have a /var. So no, that won't
always work.

-- 
Daniel Hokka Zakrisson