On Wed, 2013-01-16 at 16:46 -0600, Serge Hallyn wrote:
> Quoting Michael H. Warfield (m...@wittsend.com):
> > Serge,
> >
> > Revisiting an earlier remark...
> ...
> > > Now I tested, and with a simple setup we can use a much simpler
> > > patch which just does mount("", "/", NULL, MS_SLAVE|MS_REC, 0);
> > > for the whole of chroot_into_slave() (and skips the new umount2()
> > > in start.c). The container then starts, and its mounts table
> > > is clean.
> >
> > Were you still looking at this? Currently, with the MS_SHARED patch
>
> No, I haven't been.
>
> > work in 0.9.0, the mount table is pretty ugly and running "df" in a
> > container is really ugly...
> >
>
> ...
>
> > > Where that won't work is in a livecd or any fancy raid setup,
> > > where your process's / has a parent which is MS_SHARED.
> >
> > How bad is this breakage in regards to that then?> pivot_root would simply fail. > Likewise, the case where / is actually type 'rootfs', which is > not MS_USER and therefore can't be pivot_root()d from would > fail. > There is something else we could try. Before we chroot() into > our custom MS_SLAVE /, we could fork a child. That child sticks > around, waits for a signal saying the pivot_root+umounts are > done, then it looks through /proc/self/mounts and unmounts > anything which is not under '/root/'. > I think that might really work best. That certainly sounds like it might be worth a shot. If you could get me a patch, I could test. Beginning in a week I'm going to be out of pocket for a couple of weeks with access severely limited to my test servers, though. Regards, Mike -- Michael H. Warfield (AI4NB) | (770) 985-6132 | m...@wittsend.com /\/\|=mhw=|\/\/ | (678) 463-0932 | http://www.wittsend.com/mhw/ NIC whois: MHW9 | An optimist believes we live in the best of all PGP Key: 0x674627FF | possible worlds. A pessimist is sure of it!
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