从包含来自 ansible 的特定测试的列表中获取一个项目

Question

I need to filter items contain "TEST" in the below mentioned list,

ok: [localhost] => {
    "msg": [
        "TEST_Automation",
        "TEST-LAB",
        "PROD-Common",
        "LAB-IT",
        "TEST-Core",
        "NutanixESX",
        "NutanixLAB",
        "TEST-LaaS",
        "Projects"
    ]
}

I use the bellow command to get the above mentioned list:

    - debug:
        msg: "{{ cluster_info.clusters.keys() | list }}"

Tried selectattr or lookup but I'm unable to write correct syntax to grep the items containing "TEST". Any suggestion as I use old community version I cannot use items2dict.

Answer 1

selectattr doesn't make any sense because you have a simple list of strings (the items don't have attributes). lookup makes even less sense because that's for creating generating new information from some sort of query (like reading the lines from a file, or reading an environment variable, etc).

If you want to select items from a list based on some sort of criteria, you want the select filter :

Filters a sequence of objects by applying a test to each object, and only selecting the objects with the test succeeding.

That would look something like:

cluster_info.clusters.keys() | select('match', 'TEST')

Here we're using the match test , which "succeeds if it finds the pattern at the beginning of the string".

A runnable example:

- hosts: localhost
  gather_facts: false
  vars:
    cluster_info:
      clusters:
        "TEST_Automation": {}
        "TEST-LAB": {}
        "PROD-Common": {}
        "LAB-IT": {}
        "TEST-Core": {}
        "NutanixESX": {}
        "NutanixLAB": {}
        "TEST-LaaS": {}
        "Projects": {}

  tasks:
    - debug:
        msg: "{{ cluster_info.clusters.keys() | list | select('match', 'TEST') }}"

The above example outputs:

PLAY [localhost] ***************************************************************

TASK [debug] *******************************************************************
ok: [localhost] => {
    "msg": [
        "TEST_Automation",
        "TEST-LAB",
        "TEST-Core",
        "TEST-LaaS"
    ]
}

PLAY RECAP *********************************************************************
localhost                  : ok=1    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0