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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