Variable substitution and with_items

[José Moreira]

Hello,

my company (me) recently started using Ansible (1.7.1) for multi-stage server provisioning (both on local vagrant and ec2). Even though i haven't utilized the variable much, i have defined:

environment: production

on the environment specific group_vars file; its value can be "development", "production", "staging", etc. In the same group_vars file, for provisioning Postgresql databases i am utilizing the "ANXS.postgresql" Galaxy module and defining databases in variables as well:

postgresql_databases:

  - name: app_production

    hstore: yes

    uuid_ossp: no

I had initially planned to suffix the environment variable in the database name (not only on databases but other sections of the playbooks) : 

postgresql_databases:

  - name: app_{{ environment }}

    hstore: yes

    uuid_ossp: no

but the resulting database name after substitution becomes "app_{}" and i believe it is related, but not only, to the database task using with_items:

- name: PostgreSQL | Make sure the PostgreSQL databases are present

  postgresql_db:

    name: "{{item.name}}"

    encoding: "{{postgresql_encoding}}"

    lc_collate: "{{postgresql_locale}}"

    lc_ctype: "{{postgresql_locale}}"

    template: "template0"

    state: present

  with_items: postgresql_databases

  when: postgresql_databases|length > 0

Is it possible to use this substitution pattern (utilizing variables with other variables in its value as a list value), or am i just using the wrong pattern and just use explicit names (name_X instead of name_{{ var1 }}) ?

Thank you

[Matt Martz]

The variable name "environment" is a reserved variable name and used as described at http://docs.ansible.com/playbooks_environment.html

You should use something such as "env" or "environ" instead.

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[José Moreira]

Awesome, thank you!

[Michael DeHaan]

We have proposed changing this to something much less likely to be clobbered.

If someone would like to file a ticket, or send a pull request to make this automagic use a variable like "ansible_environment_settings" or something, we'll definitely consider changing it.

This has come up a handful of times, and while documented, it would be nice to not have the potential confusion.

To view this discussion on the web visit https://groups.google.com/d/msgid/ansible-project/43b95102-934a-40b0-b4a8-0c61550bc476%40googlegroups.com.