Is there a simple command to check if each file has only one owner?

You can do

./pants list path/to/file.py

and make sure

wc -l

is 1. That is slow if you need to check every file because invoking Pants N times is slow So, you could then use

peek

and inspect the JSON I guess, but that's complicated If you want to do this check in CI, the simplest thing may be to develop a new goal

check-single-owners

. Request

AllTargets

and probably get

SourcesPaths

for each target -- make sure they is no overlpa

thanks ... something like

sources_paths = await MultiGet(
        Get(SourcesPaths, SourcesPathsRequest(tgt.get(SourcesField))) for tgt in targets
    )

    counter = Counter(file for sp in sources_paths for file in sp.files)

seems to do the trick, although it might be useful to find owners too to help with output, i'll iterate on this