I should note that I have not yet tried using a task to filter through the
dictionary, and register the result to a variable or maybe use set_fact in
some manner.
I'd prefer not to get that complicated in the playbooks. Hence why I think
a lookup plugin would be handy.
Plus, I really really dislike tasks that always say they've changed when
running a play. I prefer it to stay idempotent as possible.
On Wednesday, August 7, 2019 at 11:07:33 AM UTC-7, David Reagan wrote:
>
> How can I return a list from a dict based on a sub items value?
>
> If I have a dictionary like this:
>
> ospackages:
>> fail2ban:
>> state: "present"
>> Ubuntu:
>> 1604: "fail2ban"
>> 1804: "fail2ban"
>> Debian:
>> 9: "fail2ban"
>> CentOS:
>> 7: "fail2ban"
>> OracleLinux:
>> 7: "fail2ban"
>> curl:
>> state: "present"
>> Ubuntu:
>> 1604: "curl"
>> 1804: "curl"
>> Debian:
>> 9: "curl"
>> CentOS:
>> 7: "curl"
>> OracleLinux:
>> 7: "curl"
>> locate:
>> state: "absent"
>> Ubuntu:
>> 1604: "mlocate"
>> 1804: "mlocate"
>> Debian:
>> 9: "mlocate"
>> CentOS:
>> 7: "mlocate"
>> OracleLinux:
>> 7: "mlocate"
>> ftp:
>> state: "absent"
>> Ubuntu:
>> 1604: "ftp"
>> 1804: "ftp"
>> Debian:
>> 9: "ftp"
>> CentOS:
>> 7: "ftp"
>> OracleLinux:
>> 7: "ftp"
>>
>
> I'd like select only the items from that dictionary based on the value of
> "state", and/or if a specific sub-dict has values.
>
> I initially thought of this as a lookup plugin.
>
> Something like:
>
> lookup('dict_cond', ospackages, 'item.value.state == "present" and
> item.value.Ubuntu is defined and item.value.Ubuntu.1804 is defined', item.
> value.Ubuntu.1804)
>
>
> would return:
>
> [ fail2ban, curl ]
>
>
>
> Use would be something like:
>
> - name: install Ubuntu 18.04 packages
> apt:
> pkg: "{{ lookup('dict_cond', ospackages, 'item.value.state == "present"
> and item.value.Ubuntu is defined and item.value.Ubuntu.1804 is defined',
> item.value.Ubuntu.1804) }}"
> state: "present"
> update_cache: "yes"
> cache_valid_time: "14400"
>
>
> - name: yum - Install packages on CentOS 7
> yum:
> name: "{{ lookup('dict_cond', ospackages, 'item.value.state == "
> present" and item.value.CentOS is defined and item.value.CentOS.7 is
> defined', item.value.CentOS.7) }}"
> state: "present"
> update_cache: True
>
>
>
> I took a look at plugins/lookup/dict.py and realized that I just don't
> know enough Python to make a plugin myself.
>
> Is there a way to do this with current plugins/modules/filters?
>
> Any other ideas on how to get the same general result?
>
> Would this be something to request as a new plugin via GitHub?
>
> I'd be willing to try and code it myself if someone is willing to work
> with me. As long as you are willing to deal with newbie python questions.
> (I do know how to program, just not in Python.)
>
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