Hi,
I have upgraded my kernel as you mentioned and everything is fine now. I wrote the following code to check the integrity of /boot directory in guest image. Now my question is-  how could I check the integrity of files that are modified in last 10 minutes inside /boot directory? I use boot directory as an example directory.

/*check a disk image for integrity */
 
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <guestfs.h>
 
 
 int
 main (int argc, char *argv[])
 {
   guestfs_h *g;
   const char *disk;
   char **roots;
 
   if (argc != 2) {
     fprintf (stderr, "usage: checkvm disk.img\n");
     exit (EXIT_FAILURE);
   }
   disk = argv[1];
 
   g = guestfs_create ();
   if (g == NULL) {
     perror ("failed to create libguestfs handle");
     exit (EXIT_FAILURE);
   }
 
   /* Attach the disk image read-only to libguestfs. */
   if (guestfs_add_drive_opts (g, disk,
      /* GUESTFS_ADD_DRIVE_OPTS_FORMAT, "raw", */
         GUESTFS_ADD_DRIVE_OPTS_READONLY, 1,
         -1) /* this marks end of optional arguments */
       == -1)
     exit (EXIT_FAILURE);
 
   /* Run the libguestfs back-end. */
   if (guestfs_launch (g) == -1)
     exit (EXIT_FAILURE);
 
   /* Ask libguestfs to inspect for operating systems. */
   roots = guestfs_inspect_os (g);
   if (roots == NULL)
     exit (EXIT_FAILURE);
   if (roots[0] == NULL) {
     fprintf (stderr, "checkvm: no operating systems found\n");
     exit (EXIT_FAILURE);
   }

 
   printf ("start check\n");

   guestfs_mount (g, "/dev/sda1", "/");
   int chkrt;
   chkrt=guestfs_checksums_out (g,
                        "sha1",
                        "/boot",
                        "chkvm.log");

   printf ("\nend check\n");
   guestfs_umount (g, "/");
   if (!chkrt)
     exit (EXIT_FAILURE);

 
     /* Unmount everything. */
     if (guestfs_umount_all (g) == -1)
       exit (EXIT_FAILURE);
 
   free (roots);
 
   guestfs_close (g);
 
   exit (EXIT_SUCCESS);
 }

Thank you.

....
Wahid


On Mon, Mar 4, 2013 at 6:27 PM, Richard W.M. Jones <rjones@redhat.com> wrote:
On Mon, Mar 04, 2013 at 05:50:27PM +0100, Khan Ferdous Wahid wrote:
> Hi,
> I tried to run the guestfs-examples from
> http://libguestfs.org/guestfs-examples.3.html, but they gave the following
> warnings and errors-
> #warning: Unable to get device geometry for /var/tmp/guestfs.JVxEUn/root

You can just ignore this.  However:

> #libguestfs: error: guestfs_launch failed, see earlier error messages

you need to run 'libguestfs-test-tool' and post the complete, unedited
output.  However:

> What I did from the beginning- I boot my debian linux (2.6.32-5-686) inside
> VirtualBox and then install following packages there-
> #apt-get install qemu libguestfs-dev libguestfs-tools

Your problem is that this kernel is too old.  You have to use at least 2.6.36.

Rich.

--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
virt-top is 'top' for virtual machines.  Tiny program with many
powerful monitoring features, net stats, disk stats, logging, etc.
http://people.redhat.com/~rjones/virt-top