If root filesystem is the last partition (new layout), resize it
in-place. Use 'parted' tool because it can resize just one partition,
without need to specify the whole new partition table. Since the
partition is mounted, parted is unhappy to modify it. Force it by
answering to its interactive prompts, and add (apparently not
documented) ---pretend-input-tty to use those answers even
though stdin is not a tty. Split the operation into multiple parted
calls, for more reliable interactive prompts handling.
Qubes 3.x disk layout (no partition table) is also supported, but the
one that was used in Qubes 4.0 rc1 (root filesystem as the first
partition) is not.
FixesQubesOS/qubes-issues#3173QubesOS/qubes-issues#3143
