Small edit, the very last line of code should be:
system_packages: "{{ webserver_packages + system_packages_copy }}"
On Wednesday, April 8, 2015 at 3:21:17 AM UTC-4, Tom Connors wrote:
>
> Please forgive a question from a newbie going about things in what is
> almost surely the wrong way.
>
> I've got two groups, "webservers" and "dbservers", which are the same
> machine in dev and different machines in production. I've defined the
> provisioning for each group in terms of roles, so it looks something like:
>
> - hosts: webservers
> roles:
> - nginx
> - nodejs
> - n-number-of-other-roles-from-ansible-galaxy
> - webservers
>
> - hosts: dbservers
> roles:
> - postgresql
> - n-number-of-other-roles-from-ansible-galaxy
> - dbservers
>
> My problem is that the nginx, nodejs, postgresql, and other roles I didn't
> write might require system packages I haven't installed yet, so I'd like to
> have a "common" role that all hosts use first that installs the packages.
> This role would refer to a variable "system_packages" and apt-get install
> all the packages in that list. In production, I can simply use group_vars
> for the two groups, but in dev, I can't do that quite as easily because
> both roles are active at once, so one of them will have their
> "system_packages" overwritten. My idea for a workaround was to define
> system_packages as being either the current value of system_packages or an
> empty list, concatenated with the role-specific packages list. In code, it
> looks like (roles/webservers/vars/main.yml):
>
> webserver_packages:
> - curl
> - tmux
>
> empty_list: []
>
> system_packages_copy: "{% if system_packages is defined %}
> {{system_packages}} {% else %} {{empty_list}} {% endif %}"
>
> system_packages: "{{ webserver_system_packages +
> webserver_system_packages_copy }}"
>
> This fails because of the indirect self-reference by the system_packages
> variable. Is there a workaround for this behavior? Or is there some better
> approach for what I'm trying to do?
>
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