[Libguestfs] appliance VM won't start, can't find /init, but /init is in the image.

[Richard W.M. Jones]

On Thu, Aug 11, 2011 at 07:10:21PM +0100, Richard W.M. Jones wrote:
> On Wed, Aug 10, 2011 at 05:16:13PM -0700, David Konerding wrote:
> > Hi,
> > Still trying to get libguestfs appliance test to work on Ubuntu Lucid.  I
> > figured out my umask was causing problems and fixed that.  now I'm on to a
> > new problem.  libguestfs-test-tool reports the following:
> > 
> > febootstrap: mounting new root on /root
> > febootstrap: chroot
> > /proc/uptime: No such file or directory
> > execl: /init: No such file or directory
> > febootstrap: debug: listing directory /
> >     2 d .                040755 4096 88619:5000
> >     2 d ..               040755 4096 88619:5000
> >    11 d lost+found       040700 16384 0:0
> >    12 d bin              040755 4096 23083:5000
> >    13 d boot             040755 4096 23083:5000
> >    14 d etc              040755 4096 23083:5000
> >   109 d lib              040755 4096 23083:5000
> >   156 d sbin             040755 4096 23083:5000
> >   157 d usr              040755 4096 23083:5000
> >   534 d var              040755 4096 23083:5000
> >  3701 - init             100750 3264 23083:5000
> > 
> > Note, init is indeed a file (a shell script).  I checked the root and initrd
> > images, and they both have init (the initrd has an init binary, the root has
> > a shell script that starts udev etc).
> 
> The problem is that the kernel gives the same error "execl: /init: No
> such file or directory" for a whole variety of reasons.  These
> include:
> 
>  - /init missing (obviously not the case here)
> 
>  - /bin/sh missing
> 
>  - any library that /bin/sh needs is missing
> 
>  - ld-linux missing
> 
> So you need to make sure /bin/sh is there.  If it's a symlink (eg. to
> dash) then the destination file is there.  Then do 'ldd /bin/sh' and
> make sure all of the required libraries and ld-linux are there.

Additionally, these files are pulled at runtime from the host.

So say that /bin/sh needs /lib/libc.so.6 which is a symlink to
/lib/libc-2.14.90.so, then you would need to check:

 - /lib/libc.so.6 listed in appliance/supermin.d/hostfiles

 - /lib/libc-*.so listed in appliance/supermin.d/hostfiles

 - /lib/libc.so.6 exists on the host filesystem and is readable
   by non-root.

 - File(s) matching /lib/libc-*.so exist on the host filesystem and
   are readable by non-root.

You may need to force the cached appliance to be rebuilt between tests
by doing:

  rm -rf {/tmp,/var/tmp}/.guestfs-*

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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