ansible-later/docs/content/build_rules/rule.md

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---
title: Write a rule
---
A typical rule check will look like:
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{{< highlight Python "linenos=table" >}}
class CheckBecomeUser(RuleBase):
rid = "ANS115"
description = "Become should be combined with become_user"
helptext = "the task has `become` enabled but `become_user` is missing"
types = ["playbook", "task", "handler"]
def check(self, candidate, settings):
tasks, errors = self.get_normalized_tasks(candidate, settings)
true_value = [True, "true", "True", "TRUE", "yes", "Yes", "YES"]
if not errors:
gen = (task for task in tasks if "become" in task)
for task in gen:
if task["become"] in true_value and "become_user" not in task.keys():
errors.append(self.Error(task["__line__"], self.helptext))
return self.Result(candidate.path, errors)
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They return a `Result` object, which contains a possibly empty list of `Error` objects. `Error` objects are formed of a line number and a message. If the error applies to the whole file being reviewed, set the line number to `None`.