Go Templating syntax is used everywhere in Kubernetes world. The most popular use case and a place you can find it are… Helm Charts. But other products such as Argo Workflows use it as well and that can sometimes become a problem – how can you properly escape… escaping syntax? Let’s see on the example.
Here I have an excerpt from WorkflowTemplate I use for OpenFaaS on my Kubernetes clusters:
apiVersion: argoproj.io/v1alpha1
kind: WorkflowTemplate
metadata:
name: openfaas
spec:
arguments:
parameters:
- name: repoUrl
value: "[email protected]:luktom-cloud/sample.git"
# some parts removed for brevity [...]
templates:
- name: main
dag:
tasks:
- name: faas-build
inline:
inputs:
artifacts:
- name: sources
path: /data/src
git:
repo: "{{ workflow.parameters.repoUrl }}"
# [...]
This template (provided we put a full manifest for it, ofz) will work if you apply it to Kubernetes clusters, but if you move it to templates folder in Helm chart… that’s the different story:
~/t/test> helm template . Error: parse error at (test/templates/pipeline-openfaas.yaml:44): function "workflow" not defined Use --debug flag to render out invalid YAML
Helm thinks the escaping syntax using {{ is for templating, which is partially true as technically it’s a template, but… for Argo Workflows and we don’t want Helm to treat it as its own!
What we can do? Use template literal!
apiVersion: argoproj.io/v1alpha1
kind: WorkflowTemplate
metadata:
name: openfaas
spec:
arguments:
parameters:
- name: repoUrl
value: "[email protected]:luktom-cloud/sample.git"
# some parts removed for brevity [...]
templates:
- name: main
dag:
tasks:
- name: faas-build
inline:
inputs:
artifacts:
- name: sources
path: /data/src
git:
repo: {{`"{{ workflow.parameters.repoUrl }}"`}}
# [...]
As you can see I surrounded my Argo Workflows template with {{` and `}} and it solves the issue!
If you have more Argo Workflow variables than Helm ones (or not have any of them), you can also surround whole file contents with {{` and `}} and it’ll do the job.
It’s not nice, I admit, but I think it’s better than dealing with post renderers in Helm, especially if you use GitOps approach with e.g. ArgoCD.
I hope that little trick save you a couple minutes of debugging!
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