[Libguestfs] PATCH: Allow specifying the filesystem driver for guestmount

Currently guestfish has mount-vfs, and the libguestfs API has guestfs_mount_vfs(), but guestmount doesn't allow the user to specify a filesystem. This patch extends the --mount argument, so you can force an ext2 partition to mount as ext4: guestmount -a mydisk.img -m /dev/vda:/:defaults:ext4 mountpoint You could also use it to choose between ntfs and ntfs-3g, or between hfsplus and the commercial ufsd. Finally, it could be useful if blkid misidentifies the filesystem. GitHub compare doodad: https://github.com/vasi/libguestfs/compare/fuse-fstype Patch: https://github.com/vasi/libguestfs/compare/fuse-fstype.patch Thanks for making such a useful utility! -V