Ooh, I'd forgotten about the wrapper scripts. And yeah, the other thing that made it work, I guess, was having the machine image be very minimal, very tightly

Ooh, I'd forgotten about the wrapper scripts. And yeah, the other thing that made it work, I guess, was having the machine image be very minimal, very tightly controlled, and very infrequently changed - so you didn't have to worry about things changing all the time due to the upstream distro.