René Rebe

So you got some virtual machines for the your development, tests. Need to extract some files, do a backup, without messing with the other messy OS?

For one thing there is some qemu fuse code patch (or so), floating around. However, the simple, robust and straight forward way is to simply loop-back mount the partition on a RAW file at the given offset. You can determine the offset with your favorite partition editor, or disktype. Once you know the sector offset you simply multiply it with 512 (usual sector size) as the offset like so:

mount -o loop,offset=$((123456* 512)) img.raw /mnt/tmp

Update: and for qcow et al images:

odprobe nbd
qemu-nbd -c /dev/nbd0 image.img
mount /dev/nbd0p2 /mnt
…
qemu-nbd –disconnect /dev/nbd0

This entry was posted on Friday, June 18th, 2010 at 11:13 and is filed under Software, Life. You can follow any responses to this entry through the RSS 2.0 feed. You can skip to the end and leave a response. Pinging is currently not allowed.