On Sat, Feb 7, 2009 at 10:24 PM, Thomas H. George <li...@tomgeorge.info> wrote:
> On Sat, Feb 07, 2009 at 03:28:20PM -0600, Boyd Stephen Smith Jr. wrote:
>> On Saturday 07 February 2009 13:37:46 Thomas H. George wrote:
>> > On Sat, Feb 07, 2009 at 10:44:47AM -0600, Boyd Stephen Smith Jr. wrote:
>> > > On Saturday 07 February 2009 10:31:17 Thomas H. George wrote:
>> > > > What must I do to be able to mount this image file?
>> > > Could you run "file debxo-awesome.ext3.img" can provide the output?
>> > dragon:/data/olpc# file debxo-awesome.ext3.img
>> > debxo-awesome.ext3.img: x86 boot sector; partition 1: ID=0x83, active,
>> > starthead 1, startsector 32, 3848160 sectors dragon:/data/olpc# exit
>>
>> It looks like it is a whole-disk image -- the first part of it appears to be
>> an MBR. You'll need to use some loopback parameters to skip the MBR and
>> partition table. I think you only need to skip 512 bytes... could you try:
>> tail -c +513 debxo-awesome.ext3.img | file -
>> and see if that reports that it found an ext3 filesystem.
>
>
> Script started on Sat 07 Feb 2009 05:14:12 PM EST
> dragon:/data/olpc# tail -c +513 debxo-awesome.ext3.img | file -
> /dev/stdin: GRand Unified Bootloader stage1_5 version 3.2, identifier 0x2,
> GRUB version 0.97, configuration file \377
> dragon:/data/olpc# exit
>
> Script done on Sat 07 Feb 2009 05:15:09 PM EST
>
> So I tried
>
>
> Script started on Sat 07 Feb 2009 05:20:59 PM EST
> dragon:/data/olpc# mount -o loop.offset=512 -t ext3 debxo-awesome.ext3.img
> /medi a/sdloop
> mount: /data/olpc/debxo-awesome.ext3.img is not a block device (maybe try `-o
> loop'?)
> dragon:/data/olpc# exit
>
> which seemed to be what the Debian Reference suggested but I guess this
> is not quite right.
>
> Script done on Sat 07 Feb 2009 05:21:57 PM EST
>>
>> > The image was meant to be transfered to a USB device but the
>> > instructions said that if the device was less than 2 Gb it could be loop
>> > mounted as ext3 in order to copy the guts of the image to a smaller USB
>> > device.
>>
>> It can be, but in this case it's not as simple as just using the loop mount
>> option, unfortunately. You'll probably need just the additional offset
>> option. Once we find the offset, things should be "easy"; although, after
>> you
>> move the files over, you'll also want to dd the MBR over as well.
You could try a slightly more heavy-handed approach:
for ((i=0 ; $i < 10000 ; i=$i + 1)) ; do
mount -o loop,offset=$(($i * 512)) debxo-awesome.ext3.img
/media/sdloop && break
done
You might even be able to use fdisk on the image to get some more information,
but I don't know about that.
Nye
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