" 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"
Ansible is not meant to be a programming language, when syntax gets so complicated that it appears to become one, I feel a playbook is strongly going in the wrong direction. It is usually useful to step back and think about the underlying use case, and there's a clean way to model it without trying to "program in YAML" I find this problem mostly comes from users coming from Chef, but not always. So, as such, I feel this is a bit of a slippery slope. Rather than initially discussing the patch, let's understand what's the real world thing you are trying to configure, at a high level, and we can likely offer up some suggestions. On Tue, Apr 29, 2014 at 4:09 AM, 'Petros Moisiadis' via Ansible Project < [email protected]> wrote: > 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]> 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 >> -- >> You received this message because you are subscribed to the Google Groups >> "Ansible Project" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send email to [email protected]. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/ansible-project/26c8f5ac-db7c-4171-8c7c-0f9605a212d4%40googlegroups.com<https://groups.google.com/d/msgid/ansible-project/26c8f5ac-db7c-4171-8c7c-0f9605a212d4%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> For more options, visit https://groups.google.com/d/optout. >> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Ansible Project" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send email to [email protected]. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/ansible-project/535EADE1.40309%40yahoo.gr<https://groups.google.com/d/msgid/ansible-project/535EADE1.40309%40yahoo.gr?utm_medium=email&utm_source=footer>. >> >> >> For more options, visit https://groups.google.com/d/optout. >> > > -- > You received this message because you are subscribed to the Google Groups > "Ansible Project" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/ansible-project/CA%2BnsWgwx9Ne97ckJOmvJQb4rgCPQX3agQjC2AuQXdeJQAdwJ%2BQ%40mail.gmail.com<https://groups.google.com/d/msgid/ansible-project/CA%2BnsWgwx9Ne97ckJOmvJQb4rgCPQX3agQjC2AuQXdeJQAdwJ%2BQ%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > > For more options, visit https://groups.google.com/d/optout. > > > -- > You received this message because you are subscribed to the Google Groups > "Ansible Project" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/ansible-project/535F5E36.4020200%40yahoo.gr<https://groups.google.com/d/msgid/ansible-project/535F5E36.4020200%40yahoo.gr?utm_medium=email&utm_source=footer> > . > > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Ansible Project" group. 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