next-uid.py
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next-uid.py
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	#!/usr/bin/env python3
	#
	# Guesses a free sequential user ID for a new account.
	#
	# To do so, reads from pillar/core/users.sls (USERS_DATASOURCE) the last users
	# uid # and offers the next one available.
	#
	# ID > 5000 (USERS_CUT) are ignored.

	import yaml


	USERS_DATASOURCE = 'pillar/core/users.sls'
	USERS_DATASOURCE_KEY = 'shellusers'
	USERS_CUT = 5000


	def get_shellusers(filename, key):
	with open(filename) as stream:
	data = yaml.safe_load(stream)
	return data[key]


	def get_uids(users, threshold):
	return [users[username]['uid']
	for username in users
	if users[username]['uid'] < threshold]


	users = get_shellusers(USERS_DATASOURCE, USERS_DATASOURCE_KEY)
	uids = get_uids(users, USERS_CUT)
	print(max(uids) + 1)