This is meant to be a high-velocity alternative to writing an entire
FUSE filesystem to facilitate smaller checkouts of the depot.
The script mostly works today, except that remote dependency detection is not set up.
Change-Id: Idf9048df4f7ee39eaaedcdafcd9621f3d7479947
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1644
Tested-by: BuildkiteCI
Reviewed-by: edef <edef@edef.eu>
Reviewed-by: tazjin <mail@tazj.in>
