On 04/29/2014 02:57 AM, Michael DeHaan wrote:
> "In a task, I am trying to figure out how I can loop over the items of a
> list that is defined as a host variable for each host in a specific
> group."
>
> If the variable is "listvar"
>
> with_items: listvar
>
>
What you suggest is the simplest form of a loop. It does not handle the
"for each host in a specific group" part. What I want is that the task
must run for all the items in each list for each host in a specific
group. Particularly, I would need a mechanism, so that the outer loop
loops over hosts and the inner loop uses the host in the current step in
the outer loop to get the needed host variable.
In general, this is a common case of a nested loop with the inner loop
using the value of the current step in the outer loop. Unfortunately, it
seems that Ansible does not support this. The current implementation of
"with_nested" loop expects its terms to be static lists all evaluated
before the execution of the loop. It does not support the second list to
be created dynamically for each step in the outer loop. So, I am
considering to teach "with_nested" lookup to understand expressions with
"item[0]" in the second term as expressions that should be reevaluated
to a list for each item in the first term. For example, the loop I need
could be simply written like this:
with_nested:
- groups["somegroup"]
- hostvars[item[0]].listvar
Would you accept a patch for that?
>
>
> On Mon, Apr 28, 2014 at 3:37 PM, 'Petros Moisiadis' via Ansible
> Project <[email protected]
> <mailto:[email protected]>> wrote:
>
> On 04/28/2014 09:56 PM, Adam Morris wrote:
>>
>>
>> On Monday, April 28, 2014 10:35:15 AM UTC-7, Ernest0x wrote:
>>
>> In a task, I am trying to figure out how I can loop over the
>> items of a
>> list that is defined as a host variable for each host in a
>> specific
>> group.
>>
>>
>> I'm not sure what you are trying to do here so I can't offer too
>> much advice. It also depends on what you are planning on doing
>> with those variables I suspect.
>>
>
> Given the example I wrote in my previous post, what I want is
> simply to have the task run for each item in "mylist" for each
> host in "somegroup". Thus, have the task run for 5 times: for
> item1, item2, item3, item4 and item5.
>
>
>> You might want to look at this
>>
>> http://docs.ansible.com/playbooks_variables.html#magic-variables-and-how-to-access-information-about-other-hosts
>>
>> Normally I only need to iterate over a list of variables for the
>> current host. But there are examples of accessing variables for
>> groups of hosts on that page.
>>
>
> I already know about these 'magic' vars. The difficulty is not on
> how to get the data, but on how to construct the loop so that I
> get the iteration I want.
>
>
>> Adam
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