what about just using dd? dd if=disk.img of=mbr bs=512b count=1
On Fri, 2013-11-22 at 16:24 +0000, Richard W.M. Jones wrote: > On Fri, Nov 22, 2013 at 01:58:24PM +0000, adrelanos wrote: > > Hi! > > > > Is it possible to read the MBR of an image and to store it inside a file? > > Yes, easily :-) > > guestfish --ro -a disk.img run : pread-device /dev/sda 512 0 > mbr > > This will work for any format of disk. Of course for a raw format > disk this is just a slower way of reading the first 512 bytes from the > raw file. > > Since what you want are simply virtual sectors from a disk image, it > could be quicker to use qemu-io. Something like this: > > qemu-io -c 'read -v 0 512' disk.img > > (Unfortunately the format returned by qemu-io is a hexdump which is > not exactly useful ... I can't work out how to get it to dump the raw > bytes but there may be a way.) > > > (If you want to know what I really want to do: > > Creating a report on all contents of an vm image. [1] [2] Create the > > image on two different machines, compare them and see, that there are > > no important differences besides temporary files.) > > > > Cheers, > > adrelanos > > > > [1] https://github.com/Whonix/Whonix/issues/113 > > [2] https://github.com/Whonix/Whonix/blob/master/release/analyze_image > > You might also want to take a look at virt-ls (although that *only* > compares files, not the other data outside the filesystem): > > http://libguestfs.org/virt-ls.1.html#differences-in-snapshots-and-backing-files > > I keep meaning to write a comprehensive "virt-diff" tool. I needed it > myself just yesterday. > > Rich. > -- ---------------------------------------------------------------------------- Jason A. Kates (ja...@kates.org) Fax: 208-975-1514 Phone: 660-960-0070 ============================================================================ _______________________________________________ Libguestfs mailing list Libguestfs@redhat.com https://www.redhat.com/mailman/listinfo/libguestfs
