On 01. nov. 2017 12:44, Dick Visser wrote:
> I have a few use cases where I define a list in group_vars/all.yml,
> for instance a list of users:
>
> users:
> - allen
> - bob
> - chris
> - dick
>
>
> So this list applies to all hosts in my case.
>
> But for a specific host, I want to add one entry to the list.
> The only way I can get that to work is by copying the list in
> host_vars/somehost/main.yml and just manually add it:
>
> users:
> - allen
> - bob
> - chris
> - dick
> - extrauser
>
> Obviously this is not ideal as any changes made to the first var will
> have to be manually carried over to the specific instances.
>
> Is there some way to append items to list vars (or subtract, for that matter)?
>
> I was hoping to be able to use something like:
>
> users: "{{ users }} + ['extrauser']"
>
> But that gives me "recursive loop detected in template string".
>
> Any other/clean ways to solve this?
Use two variable users and extra_users on host that need to have some extra
users.
Then you can use this, because of default this will not fail on host that do
not have extra_users varaible set.
{{ users | union(extra_users | default([])) }}
--
Kai Stian Olstad
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