[buildd-tools-devel] Bug#688750: Bug#688750: schroot and autofs need better integration

[Roger Leigh]

On Thu, Nov 01, 2012 at 04:38:09PM +0100, Reinhard Tartler wrote:
> On Thu, Nov 1, 2012 at 3:34 PM, Reinhard Tartler <siretart at gmail.com> wrote:
> 
> >
> > Nevertheless, I've also implemented another approach, which uses the host
> > automount binary. I did not test the script extensively, but it seems to
> > work as a proof of concept on both schroot 1.4 and schroot 1.6 branches.
> > I'm sure that it could be greatly simplified with some little changes to
> > automount and schroot, but it should be good enough to demonstrate the
> > idea. Please find that script, 71automount, attached to this email and
> > share your thoughts about this.
> >
> >
> It seems that 71automount alone is enough to break the --recover-session
> option, because 10mount fails to umount and mount all filesystems again. In
> order to fix this, I think that in the recover session case, a setup.d
> script must ensure that automount is properly killed. The attached
> 01automount files implements this.
> 
> Roger, please tell me if this approach makes sense to you and what is
> missing so that these two scripts can be integrated into the schroot
> package properly.

Hi,

I'm afraid I'm not an autofs expert by any means, so I can't give great
feedback here.  Some questions:

- what creates the new autofs map?  And what is it based upon?
- does this require any autofs-related stuff installed in the chroot,
  or is it only required on the host?
- what is this code actually for?  Sorry for being uninformed here, but
  I'm not sure I understand what the use case is for this.  An example
  would help.
- does this make rbind work again?  Or is this a separate issue?

For the second point, we ideally don't want anything inside, because
we're potentially running binaries from a different architecture in the
chroot, and we haven't set up the emulation stuff at this point.

After being badly bitten by the rbind stuff last year, I am generally
quite wary of getting schroot involved in explicitly using autofs,
particularly when I don't understand it or its bugs.  I'm sure that
some more detailed explanation will help here though.


Regards,
Roger

-- 
  .''`.  Roger Leigh
 : :' :  Debian GNU/Linux    http://people.debian.org/~rleigh/
 `. `'   schroot and sbuild  http://alioth.debian.org/projects/buildd-tools
   `-    GPG Public Key      F33D 281D 470A B443 6756 147C 07B3 C8BC 4083 E800