@witty-crayon-22786 for https://github.com/pantsbuild/pants/issues/4999 the functionality we really want is: 1. For each

ScanDir

in the graph, if a file is created or deleted which would change it, invalidate 2. For each

DigestFile

in the graph, if a file’s contents or permissions are modified, invalidate 3. Something something

ReadLink

something something where invalidate means that node, and its transitive rdeps And maybe some cleverness around debouncing Right?

yea, that sounds about right. and starting dumb and conservative (ie, unifying all changes of any kind into a notification that "path x and its parent directory have changed") would be fine... that's approximately what we have now via watchman.