is there any filter in ansible can mimic all() and any()?

user_1492613 0
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It is surprising there is no such filter in jinja2 or ansible. What is the canonical way to mimic this in ansible? I expect to have [True, False] | all return False, [True, False] | any return True. So far for any I can use sum then check if it is greater than 0. But all is trickier I have to do select('false') | length ==0 which looks quite stupid. Is there better way to do this?

ansible
1 Answers

This is exactly what all and any tests do e.g.

    - debug:
        msg: "{{ [True, False] is all }}"
    - debug:
        msg: "{{ [True, False] is any }}"

give

  msg: false
  msg: true

There are no such filters in Ansible but you can write them e.g.

shell> cat filter_plugins/list2bool.py

def fall(l):
        return all(l)

def fany(l):
        return any(l)

class FilterModule(object):
    ''' Ansible filters for operating on Boolean '''

    def filters(self):
        return {
            'fall': fall,
            'fany': fany,
            }

(see other plugins)

These custom filters are useful in pipes, e.g. to map lists

    - debug:
        msg: "{{ l|map('fall')|list }}"
      vars:
        l:
          - [True, True]
          - [True, False]
          - [False, True]
          - [False, False]

gives

  msg:
  - true
  - false
  - false
  - false

and

    - debug:
        msg: "{{ l|map('fany')|list }}"
      vars:
        l:
          - [True, True]
          - [True, False]
          - [False, True]
          - [False, False]

gives

  msg:
  - true
  - true
  - true
  - false
user_64825610
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