Interrupting the script can be dangerous

[luc65r]

I was running the script as root (probably not the best idea), and realizing I made a mistake in the arguments, I hit Ctrl-C.
The script proceeded to override /etc/fstab on the host, which is less than ideal.

My guess is it exited the chroot and somehow ran cat > /etc/fstab <<-EOF.

I don't know if it is easily reproducible, but maybe there is a way to safeguard against that.