Ignore everything except allowed files in .gcloudignore

.gcloudignore

# Ignore everything
/[!.]*
/.?*

# Except the Cloud Function files we want to deploy
!/package.json
!/index.js
!/lib/**

#!include:.gitignore

evaluate_gcloudignore.py

import os

from googlecloudsdk.command_lib.util import gcloudignore

chooser = gcloudignore.GetFileChooserForDir('.')
predicate = chooser.IsIncluded

for root, _, filelist in os.walk('.'):
    path = os.path.normpath(os.path.relpath(root, '.'))

    if not predicate(path):
        continue

    for f in filelist:
        filename = os.path.normpath(os.path.join(root, f))

        if not predicate(filename):
            continue

        print(filename)

@jake-tulip this is late, and I don't know that you'll get a notification... I've tested the following with the above Python script:

!/dir/
!/dir/config/**