kpartx is one the most useful utilities ever created :)
On Thu, Jan 13, 2011 at 7:12 PM, John Weekes
<lists.xen@xxxxxxxxxxxxxxxxxx> wrote:
> To save yourself from having to calculate an offset, you could also mount
> the whole image and then use the "kpartx" command to map out the partitions
> for you.
>
> -John
>
> On 1/13/2011 2:05 PM, Chris Petrolino wrote:
>>
>> Aha that's most likely what I was forgetting! I will give that a shot and
>> report back. Thanks a million guys
>>
>> Kind Regards,
>>
>> Christopher James Petrolino
>>
>>
>> On Jan 13, 2011, at 5:01 PM, dave<dave@xxxxxxxxxxxxxxx>  wrote:
>>
>>> If it's a disk image you need to provide an offset, for example
>>>
>>> mount -o loop,offset=32256 /xen/guest.img /mnt/tmp
>>>
>>> the offset depends on the partitioning of the disk file.  for example:
>>>
>>> ~$ fdisk -l -u -c guest.img
>>>
>>>    Device Boot      Start         End      Blocks   Id  System
>>> guest.img1   *        2048     9920511     4959232   83  Linux
>>> guest.img2         9922558    10483711      280577    5  Extended
>>> guest.img5         9922560    10483711      280576   82  Linux swap /
>>> Solaris
>>>
>>> this disk image has a 2048 cylinder boot sector, so the offset would be
>>> 2048*512, or 1048576
>>>
>>> another example:
>>>
>>> ~$ fdisk -l -u -c guestA.img
>>>
>>>     Device Boot      Start         End      Blocks   Id  System
>>> guestA.img1   *          63     1767149      883543+  83  Linux
>>> guestA.img2         1767150     1992059      112455    5  Extended
>>> guestA.img5         1767213     1992059      112423+  82  Linux swap /
>>> Solaris
>>>
>>> this has a 63 cyl boot sector, so the offset would be 63*512 = 32256.
>>>
>>> as a shortcut, (in bash shell) you can do this:
>>>
>>> mount -o loop,offset=$((512*63)) guestA.img /mnt/tmp
>>>
>>>
>>>
>>> On 01/13/2011 01:51 PM, Steven Timm wrote:
>>>>
>>>> What's the output of
>>>>
>>>> file /xen/guest.img
>>>>
>>>> probably you need to specify -t ext2
>>>> but the file command will tell you for sure.
>>>>
>>>> Steve
>>>>
>>>>
>>>> On 2011年1月13日, Christopher J Petrolino wrote:
>>>>
>>>>> Ok guys I am wondering if anyone can help me out here. I am trying to
>>>>> mount a xen .img file. when I try to do a mount -o loop /xen/guest.img
>>>>> /mnt/tmp I get a message saying that I need to specify a partition
>>>>> type.. What am I missing?
>>>>>
>>>>> Many thanks in advance,
>>>>>
>>>>> CJP
>>>>>
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>>>>>
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