FortiOS: Allow any policy

[a-v-popov]

This is possible variant to address #3323

Policy is injected in initial configuration.

It is configured by device configuration:

$ cat ~/.netlab.yml 
---
devices.fortios:
  group_vars:
    netlab_allow:
      disable: false

[ipspace]

Lovely idea. I would make a few slight changes in the variable names and streamline the tests.

[ipspace]

I would call it "netlab_default_policy" or some such, and generate the firewall policy if the variable is defined.

If you want to have an override option (setting it to false to disable it), go with netlab_default_policy|default(false)-- that will be false if the variable is not defined or if it's set to False, and will evaluate to false as a boolean expression even if it has falsy value (like None or an empty dictionary).

[ipspace]

At this point, we know "netlab_default_policy" (or however it's called) is defined. Under our current Jinja2 setup, you could simply test netlab_default_policy.disable|default(false) and have the desired result even when netlab_default_policy is not a mapping.

Personally, I would prefer using enable with default true, "not disabling" is a double negation, and that tends to get confusing.

[ipspace]

Here's how you can test whether any particular trick works with our Jinja2 setup. As we are using the same code to generate reports and device configs, you can create a report that uses none of the topology variables and play with Jinja2 expressions. The only tricks:

• The report has to be in reports directory and have .j2 extension
• There should be topology.yml file or a started lab in the current directory

After setting this up, just do netlab report reportname and experiment.

Here's what I tested:

{% set tv = true %}
{% set fv = false %}
{% set sv = "abc" %}
{% set nv = None %}
{% set mv = {'a': true, 'b': false} %}

tv: {{ tv }} tv.a: {{ tv.a|default('DEFAULT') }}
fv: {{ fv }} fv.a: {{ fv.a|default('DEFAULT') }}
sv: {{ sv }} sv.a: {{ sv.a|default('DEFAULT') }}
nv: {{ nv }} nv.a: {{ nv.a|default('DEFAULT') }}
mv: {{ mv }} mv.a: {{ mv.a|default('DEFAULT') }} mv.x: {{ mv.x|default('DEFAULT') }}

And here are the test results:

% netlab report j2test
[INFO]    Using lab topology file topology.yml

tv: True tv.a: DEFAULT
fv: False fv.a: DEFAULT
sv: abc sv.a: DEFAULT
nv: None nv.a: DEFAULT
mv: {'a': True, 'b': False} mv.a: True mv.x: DEFAULT