Brook Milligan <[email protected]> writes: > I find that vnconfig is really useful for building disk images for > embedded or Xen systems. However, in some cases the image file must > contain information (e.g., boot sectors) in addition to the > filesystem. It is, of course, possible to extract portions with dd to > a new file, expose that file as a disk via vnconfig, and then reinsert > the file back into the original image with dd. However, it would make > much more sense (I believe) to be able to use vnconfig with options to > specify the offset and size of the file subset to treat as a disk > image. For example, I'm thinking of something like the following > > vnconfig -c -o 8192 -s 114688 vnd0 bootdisk.img
My reaction is that vnconfig is for making a file look like a disk, and that the problem you are having with addressing part of the disk is a disk problem, not a file problem. So the solution to it should apply equally to a vnd as to a physcial disk. Consider what you would do if you had attached a physical disk to your system to prepare instead. For vm images, I tend to use bare disklabel and not fdisk, and thus can address the partitions using vnd0a, vnd0e, etc.
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