the one i use is `src/rust/engine/target/debug/fs_...
# development
a
the one i use is
src/rust/engine/target/debug/fs_util directory cat-proto --output-format recursive-file-list-with-digests bf08411ed80e316259a61368434b7c868b8c6c0e85f5e403dbffe19d12f19a9c 273