I feel like this should be obvious but I'm stumped. When adding a new

PythonToolBase

subsystem (in the pants repo), how do you generate the initial lockfile? I tried adding my new subsystem to

build_support/bin/generate_builtin_lockfiles.py

and then running

pants run build-support/bin/generate_builtin_lockfiles.py -- --debug elfdeps

(where elfdeps is the option scope of my new subsystem). But it complains that the lockfile can't be found (I know. That's why I asked to generate it.). Using

--keep-sandboxes

is not helpful because of the secondary sandbox that gets created by the

generate_builtin_lockfiles.py

script. Do I need to copy some other random lockfile and use it as a seed?