项目页面http://libguestfs.org/声称我们可以在没有 的情况下进行操作sudo，这很棒。
但是，如果我尝试一下：
sudo apt-get install libguestfs-tools
mkdir sysroot
# Just a test file.
dd if=/dev/urandom of=sysroot/myfile bs=1024 count=1024
virt-make-fs --format=ext2 --type=qcow2 sysroot sysroot.qcow2
我收到错误：
libguestfs: error: /usr/bin/supermin exited with error status 1.
To see full error messages you may need to enable debugging.
Do:
export LIBGUESTFS_DEBUG=1 LIBGUESTFS_TRACE=1
and run the command again. For further information, read:
http://libguestfs.org/guestfs-faq.1.html#debugging-libguestfs
You can also run 'libguestfs-test-tool' and post the *complete* output
into a bug report or message to the …