Loop over Ansible variable array in Jinja2 template to create nested dictionary

Question

Here is the output.

"result.containers":[
   {
      "Image":"ca.docker/webproxy:1.0.0",
      "Names":[
         "/customer1"
      ]
   },
   {
      "Image":"docker.local/egacustomer:1.0.1",
      "Names":[
         "/webproxy"
      ]
   }
]

I'm trying to create a nested dictionary using jinja2. i'm trying to achieve the below using results.container and setfact.

"containerlist": "[webproxy:
                     name: customer1,
                   egacustomer:
                     name: webproxy]"

Here is my jinja2 code.

- set_fact:
      containerlist: |
           [
           {% for item in result.containers %}
           {{ item.Image | regex_replace('.*?/(.*?):.*', '\\1') }}:
                     'name': {{ item.Names | regex_replace("^/", "") }},
           {% endfor %}

Which throws the error. Could someone help me with the right Jinja2 Code.Any help would be greatly appreciated

"containerlist": "[\n\\1:\n          'name': ['/customer'],\n\\1:\n          'name': ['/webproxy'],\n,\n]\n"

larsks · Accepted Answer · 2020-08-10 12:40:01Z

3

For what you're trying to do I would normalize use an Ansible looping task rather than trying to use a Jinja {% for ... %} loop. For example, these tasks...

    - set_fact:
        container_list: >-
          {{
          container_list + [{
            item.Image.split('/')[-1].split(':')[0]:
              item.Names[0][1:]
          }]
          }}
      loop: "{{ result.containers }}"
      vars:
        container_list: []

    - debug:
        var: container_list

In the set_fact task, we're looping over result.containers, and for each iteration of the loop we redefine container_list as "the current contents of container_list + a new dictionary".

The above produces the following output:

TASK [set_fact] ****************************************************************
ok: [localhost] => (item={'Image': 'ca.docker/webproxy:1.0.0', 'Names': ['/customer1']})
ok: [localhost] => (item={'Image': 'docker.local/egacustomer:1.0.1', 'Names': ['/webproxy']})

TASK [debug] *******************************************************************
ok: [localhost] => {
    "container_list": [
        {
            "webproxy": "customer1"
        },
        {
            "egacustomer": "webproxy"
        }
    ]
}

answered Aug 10, 2020 at 12:40

larsks

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3 Comments

Sara James Over a year ago

Could you please help me change it to a dictionary instead of a list.

larsks Over a year ago

If you update your question to show the desired format, I can give it a shot.

Sara James Over a year ago

Thanks,larsks. I could populate dictionary with the code.

set_fact:           containeruplist: "{{ containeruplist|default({}) | combine( {item.Image.split('/')[-1].split(':')[0]:item.Names[0][1:]} ) }}"         loop: "{{ resultup | json_query('containers[*]') }}"

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