On Wednesday, June 26, 2019 at 10:08:17 AM UTC-4, jean-christophe manciot
wrote:
>
> The real goal here is to perform an action only when at least one of
> *inventory_hostname* groups from *group_names* matches one group from
> another list of groups (in this example: ```git|local|ntopng```) .
>
> This is defined within a *role*, so I cannot use the list ``` -
> hosts:```.
>
> For instance, to print all hostname variables only when inventory_hostname
> belong to at least one of git,local or ntopng groups,I tried this:
> - name: Print all variables for "{{ inventory_hostname }}" system device
> (except any role parameters)
> debug:
> var: hostvars[inventory_hostname]
> when: group_names | map('regex_search', "^(git|local|ntopng)$") | list |
> length > 0
>
That's overly complicated, unless you've misstated your requirements.
when: group_names | intersect(['git', 'local', 'ntopng'])
> It does not work as expected, because the length always returns the number
> of groups within group_names. It seems that length considers a null
> element as defined and counts it.
> "is defined" does not work either for the same reason.
>
> I cannot find a way to test if *at least one element of the search is not
> null*.
>
While you shouldn't be using regex or complex filtering at all for this
particular thing, you might find this information useful in the future.
A null element is still an element. You can filter out elements you don't
want.
when: group_names | map('regex_search', "^(git|local|ntopng)$") | select |
list
Though it's simpler to do that in the first place instead of map.
when: group_names | select('match', '^(git|local|ntopng)$') | list
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