[klibc] [PATCH 6/8] switch_root: Fix single file mounts

[maximilian attems]

On Fri, Jul 29, 2011 at 10:15:29AM +0200, Michal Suchanek wrote:
> Excerpts from Mike Waychison's message of Thu Jul 28 19:26:06 +0200 2011:
> > On Wed, Jul 27, 2011 at 12:42 PM, maximilian attems <max at stro.at> wrote:
> > > On Mon, 18 Jul 2011, Michal Suchanek wrote:
> > >
> > >> Hello,
> > >>
> > >> Excerpts from maximilian attems's message of Wed Jul 13 15:48:31 +0200 2011:
> > >> > From: Michal Suchanek <michal.suchanek at ruk.cuni.cz>
> > >> >
> > >> > The root of the failure is that nuke cannot cope with file
> > >> > mounts (single files mounted, not directories). These are the result of
> > >> > using fuse to get to the root filesystem (httpfs, curlftpfs).
> > 
> > Why not just add support for unmounting the file?
> 
> Most likely it will be busy (backing /new_root).

I don't understand this statement.
 
> > 
> > >> >
> > >> > This fixes
> > >> > http://bugs.debian.org/476268
> > >>
> > >> thanks for looking into this.
> > >>
> > >> Since this is a long-standing issue I wrapped the file mount in a tmpfs
> > >> mount as a workaround.
> > 
> > How does this work?
> 
> The mountpoint is picked up by another part of the script and moved
> somewhere where it does not get in the way of nuke_initramfs.

again please be more explicit and show us at least the code that is
involved, currently one can only wild guess what you are trying to do.

If your case is some ghost /foo/bar/ mount in the initramfs what is that
needed for and why?

I do agree that run-init needs to emit a warning when it can't remove
something, this is easily fixable and will be, but that is not the
use case you are currently promoting.
 
thank you

-- 
maks