How to raise an exception in a Jinja2 macro?

jinja2, python, salt-stack

Solution

Dean Serenevy's answer is elegant. Here is a shorter solution, which adds a global to jinja's environment.

def raise_helper(msg):
    raise Exception(msg)

env = jinja2.Environment(...
env.globals['raise'] = raise_helper

Then in your template:

{{ raise("uh oh...") }}

Problem

I have a macro that is used to build a local repository using `debmirror`. Here's the snippet of code: ``` {%- set gnupghome = kwargs.pop('gnupghome', '/root/.gnupg') %} {%- set env = { 'GNUPGHOME': gnupghome } %} keyring_import: cmd: - run {%- if 'keyid' in kwargs and 'keyserver' in kwargs %} {%- set keyid = kwargs.pop('keyid') %} {%- set keyserver = kwargs.pop('keyserver') %} - name: 'gpg --no-default-keyring --keyring {{ gnupghome }}/trustedkeys.gpg --keyserver {{ keyserver }} --recv-keys {{ keyid }}' {%- elif 'key_url' in kwargs %} {%- set key_url = kwargs.pop('key_url') %} - name: 'wget -q -O- "{{ key_url }}" | gpg --no-default-keyring --keyring {{ gnupghome }}/trustedkeys.gpg --import' {%- endif %} - require: - pkg: wget - pkg: gnupg ``` At the `endif` keyword, I would like to use `else` to raise an exception, for e.g: Either key_url or both keyserver and keyid required. Is it possible?

Original source