libguestfs is a set of tools for accessing and modifying virtual machine (VM) disk images. You can use this for viewing and editing files inside guests, scripting changes to VMs, monitoring disk used/free statistics, P2V, V2V, performing partial backups, cloning VMs, and much more. libguestfs can access nearly any type of filesystem including: all known types of Linux filesystem (ext2/3/4, XFS, btrfs, etc.), any Windows filesystem (VFAT and NTFS), any Mac OS X and BSD filesystems, LVM2 volumes, MBR and GPT disk partitions, raw disks, qcow2, CD and DVD ISO images, SD cards, and dozens more. libguestfs doesn't need root permissions.
New virt-alignment-scan, virt-sparsify, and virt-sysprep tools were added. Virt-resize can now resize Ubuntu guests, and fix alignment issues in Windows and Linux guests. 'guestmount --live' works. Systemtap support was added. Virt-cat now supports Windows drive letters and paths. Erlang bindings were added. 18 bugs have been official fixed, and many more unofficially.
URL: libguestfs, library for accessing and modifying VM disk images