depot-scanner is a tool that runs Nix and parses the --trace-file-access output to deduce what files are necessary to evaluate a derivation.
Take DEPOT_ROOT from the environment. If depotRoot doesn't exist, print an error early.
Fix the build of the protobuf library. Switch to the GRPC build rule, as a service is in this proto file.
Create the PathType enum and parse it from cmdline flags.
Change-Id: I537b5c6bceecf76ca510f7ac04ab9dad7785feb1
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1769
Tested-by: BuildkiteCI
Reviewed-by: tazjin <mail@tazj.in>
Reviewed-by: lukegb <lukegb@tvl.fyi>
