使用 jinja2 展平 ansible 结果

Question

I am getting a list of elements of the same structure using ansible, it looks a bit like the following:

results: [
  {
    "a": "foo",
    "b": "bar",
    "c": [
      {"c1": ...},
      {"c2": ...}
      {"c3": ...}]
  },
  {
    "a": "foo2",
    "b": "bar2",
    "c": [
      {"c4": ...},
      {"c5": ...}
      {"c6": ...}]
  }
]

I would need to iterate over all subelements of c - of all elements, so what I want is a list of the elements: c1, c2, c3, c4, c5, c6...

Normally I would use a nested loop, but since ansible is using jinja2s filters, I have no clue on how to accomplish that. I am totally new to this kind of data transformation.

---

To give some context, the actual code is:

- name: Find log files that are older than 1 day
  find:
    paths: "{{ item }}"
    age: 1d
    recurse: no
  register: oldLogs
  loop:
    - "/var/log"
    - "/home/user/log"

- name: print files
  debug:
    msg: "{{ oldLogs.results | <some filters here> }}\n"

Yes, I know I could pass a list of paths to find instead, but that's not the way I want to go, instead I would like to learn on how to use filters in such a situation.

Answer 1

For example,

results_c: "{{ (results|
                map(attribute='c')|
                flatten|
                combine).keys()|list }}"

gives the list

results_c: [c1, c2, c3, c4, c5, c6]

---

Example of a complete playbook for testing

- hosts: localhost vars: results: - a: foo b: bar c: - c1: val_1 - c2: val_2 - c3: val_3 - a: foo2 b: bar2 c: - c4: val_4 - c5: val_5 - c6: val_6 results_c: "{{ (results| map(attribute='c')| flatten| combine).keys()|list }}" tasks: - debug: var: item loop: "{{ results_c }}"

gives (abridged)

 TASK [debug] ********************************************************************************* ok: [localhost] => (item=c1) => ansible_loop_var: item item: c1 ok: [localhost] => (item=c2) => ansible_loop_var: item item: c2 ok: [localhost] => (item=c3) => ansible_loop_var: item item: c3 ok: [localhost] => (item=c4) => ansible_loop_var: item item: c4 ok: [localhost] => (item=c5) => ansible_loop_var: item item: c5 ok: [localhost] => (item=c6) => ansible_loop_var: item item: c6