[Libguestfs] libguestfs-test-tool on ubuntu: kernel panic

Wed Aug 10 18:27:34 UTC 2011

On Wed, Aug 10, 2011 at 10:46 AM, Richard W.M. Jones <rjones at redhat.com>wrote:

> On Wed, Aug 10, 2011 at 09:42:10AM -0700, David Konerding wrote:
> > BTW, it's actually a list of ~8000 files (looks like all the unpacked
> files
> > from all the .debs that got downloadeD).
> >
> > I stopped feboostrap during its download after it downloaded the .deb for
> > bash (there seems to be no option to force febootstrap to not clean up
> > /tmp/febootstrap* after running).
> >
> > I see no reason why feboostrap wouldn't be able to read these files:
> > 2318338    4 drwxr-xr-x   2 dek      redacted          4096 Aug 10 09:39
> > /tmp/bashpkg/bin
> > 2318444    0 lrwxrwxrwx   1 dek      redacted             4 Aug 10 09:39
> > /tmp/bashpkg/bin/sh -> bash
> > 2318443    0 lrwxrwxrwx   1 dek      redacted             4 Aug 10 09:39
> > /tmp/bashpkg/bin/rbash -> bash
> > 2318339 920 -rwxr-xr-x   1 dek      redacted        934336 Apr 18  2010
> > /tmp/bashpkg/bin/bash
>
> I would agree this certainly looks like a bug in febootstrap.  I can't
> imagine what it would be that wouldn't also affect our builds on
> Ubuntu 11.04.
>
> Here is a way you could try reproducing the issue, in a smaller and
> more manageable context.
>
> You can run all of the commands below as non-root from /tmp or another
> temporary directory.
>
> First:
>
> $ febootstrap --verbose --names bash
>
> then examine the debug messages and the output files created in the
> current directory ('base.img' and 'hostfiles').
>
>
This fetches bash, dash, and a number of other packages.  It reports:
1719 files and directories
febootstrap: warning: some host files are unreadable by non-root
febootstrap: warning: get your distro to fix these files:
        /bin/bash
        /bin/cat
        /bin/chgrp
        /bin/chmod
...

There are 1361 files in the list.

> If base.img and hostfiles look reasonable, try building an appliance
> from them:
>
>
Looking at hostfiles, there is no /bin/bash, but there is /bin/sh and
/bin/rbash (BTW, Ubuntu uses dash as the main /bin/sh, not bash, but I
assume that's not relevant).  sh is a symlink to bash, as is rbash.

I extracted base.img, and it doesn't include any files in /bin.  It looks
like all the files in that archive are text/config files or symlinks.

$ febootstrap-supermin-helper -f ext2 -v \
>  base.img hostfiles $(uname -m) kernel initrd appliance
>
> (Note that 'kernel', 'initrd' and 'appliance' are all output files
> that will be created in the current directory).
>
> Now you've got a chicken-and-egg problem, but 'appliance' is an ext2
> disk image which can be examined using guestfish:
>
> $ guestfish --ro -a appliance -m /dev/sda
>
>
Right.  I just mounted it as a loopback image instead... /bin contains only
this:
$ ls -l  /mnt/appliance/bin
total 8
lrwxrwxrwx 1 root root 4 Sep 22  2010 rbash -> bash
lrwxrwxrwx 1 root root 9 Sep 22  2010 sh -> /bin/bash

Running strace on febootstrap, I see that it stats the /bin/bash in the
unpacked bash deb pkg at least once successfully:
7928
 lstat("/tmp/febootstrape193191fefe36c245623bc48e5b150a2.tmp/bash_4.1-2ubuntu3_amd64.deb.d//bin/bash",
{st_mode=S_IFREG|0750, st_size=934336, ...}) = 0
7928  write(2, "febootstrap: warning: some host files are unreadable by
non-root\nfebootstrap: warning: get your distro to fix these
files:\n\t/bin/bash\n", 134) = 134

> Welcome to guestfish, the libguestfs filesystem interactive shell for
> editing virtual machine filesystems.
>
> Type: 'help' for help on commands
>      'man' to read the manual
>      'quit' to quit the shell
>
> ><fs> ll /bin/
> total 2668
> drwxr-xr-x  2 1000 1000   4096 Aug 10 17:40 .
> drwxr-xr-x 17 1000 1000   4096 Aug 10 17:41 ..
> -rwxr-xr-x  1    0    0 954896 Mar 31 21:20 bash
> -rwxr-xr-x  1    0    0  47696 Feb 23 14:24 cat
> -rwxr-xr-x  1    0    0  55864 Feb 23 14:24 chgrp
> -rwxr-xr-x  1    0    0  51704 Feb 23 14:24 chmod
> -rwxr-xr-x  1    0    0  55880 Feb 23 14:24 chown
> -rwxr-xr-x  1    0    0 117808 Feb 23 14:24 cp
> -rwxr-xr-x  1    0    0 109736 Nov 15  2010 dash
> -rwxr-xr-x  1    0    0  55832 Feb 23 14:24 date
> -rwxr-xr-x  1    0    0  51840 Feb 23 14:24 dd
> -rwxr-xr-x  1    0    0  64208 Feb 23 14:24 df
> -rwxr-xr-x  1    0    0 105776 Feb 23 14:24 dir
> -rwxr-xr-x  1    0    0  26968 Feb 23 14:24 echo
> -rwxr-xr-x  1    0    0  22856 Feb 23 14:24 false
> -rwxr-xr-x  1    0    0  47680 Feb 23 14:24 ln
> -rwxr-xr-x  1    0    0 105776 Feb 23 14:24 ls
> -rwxr-xr-x  1    0    0  47624 Feb 23 14:24 mkdir
> -rwxr-xr-x  1    0    0  31112 Feb 23 14:24 mknod
> -rwxr-xr-x  1    0    0  35352 Feb 23 14:24 mktemp
> -rwxr-xr-x  1    0    0 109584 Feb 23 14:24 mv
> -rwxr-xr-x  1    0    0  31200 Feb 23 14:24 pwd
> lrwxrwxrwx  1    0    0      4 Jul 20 21:19 rbash -> bash
> -rwxr-xr-x  1    0    0  35272 Feb 23 14:24 readlink
> -rwxr-xr-x  1    0    0  55872 Feb 23 14:24 rm
> -rwxr-xr-x  1    0    0  39320 Feb 23 14:24 rmdir
> -rwxr-xr-x  1    0    0  15048 Jan 20  2011 run-parts
> lrwxrwxrwx  1    0    0      4 Jul 20 21:19 sh -> dash
> -rwxr-xr-x  1    0    0  26984 Feb 23 14:24 sleep
> -rwxr-xr-x  1    0    0  63992 Feb 23 14:24 stty
> -rwxr-xr-x  1    0    0  22872 Feb 23 14:24 sync
> -rwxr-xr-x  1    0    0  10312 Jan 20  2011 tempfile
> -rwxr-xr-x  1    0    0  47640 Feb 23 14:24 touch
> -rwxr-xr-x  1    0    0  22856 Feb 23 14:24 true
> -rwxr-xr-x  1    0    0  27016 Feb 23 14:24 uname
> -rwxr-xr-x  1    0    0 105776 Feb 23 14:24 vdir
> -rwxr-xr-x  1    0    0    946 Jan 20  2011 which
>
> (The above output was from Ubuntu 11.04)
>
> Rich.
>
> --
> Richard Jones, Virtualization Group, Red Hat
> http://people.redhat.com/~rjones
> libguestfs lets you edit virtual machines.  Supports shell scripting,
> bindings from many languages.  http://libguestfs.org
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listman.redhat.com/archives/libguestfs/attachments/20110810/5d2f7c9c/attachment.htm>