helm chart / go-template | Translate environment variables from string - kubernetes

Question

I have a general helm chart in my Kubernetes cluster taking a multiline text field with environment variables (identified by KEY=VALUE), translating them into the deployment.yaml like this:
Inside the Rancher dialog:
In the deployment.yaml:
{{- if .Values.envAsMultiline }}
{{- range (split "\n" .Values.envAsMultiline) }}
- name: "{{ (split "=" .)._0 }}"
value: "{{ (split "=" .)._1 }}"
{{- end }}
{{- end }}
This works fine so far. But the problem now is: If I have a "=" in my environment variable (Like in the JAVA_OPTS above), it splits the environment variable value at the second "=" of the line:
JAVA_OPTS=-Xms1024m -Xmx2048m -XX:MetaspaceSize=256M -XX:MaxMetaspaceSize=512m
is translated to
-Xms1024m -Xmx2048m -XX:MetaspaceSize
The "=256M -XX:MaxMetaspaceSize=512m" is missing here.
How do I correct my deployment.yaml template accordingly?

Answer 1

Plan 1:
One of the simplest implementation methods
You can directly use the yaml file injection method, put the env part here as it is, so you can write the kv form value and the ref form value in the values in the required format.
As follows:
values.yaml
env:
- name: ENVIRONMENT1
value: "testABC"
- name: JAVA_OPTS
value: "-Xms1024m -Xmx2048m -XX:MetaspaceSize=256M -XX:MaxMetaspaceSize=512M"
- name: TZ
value: "Europe/Berlin"
deployment.yaml
containers:
- name: {{ .Chart.Name }}
env:
{{ toYaml .Values.env | nindent xxx }}
(ps: xxx --> actual indent)
Plan 2:
Env is defined in the form of kv, which is rendered in an iterative manner
values.yaml
env:
ENVIRONMENT1: "testABC"
JAVA_OPTS: "-Xms1024m -Xmx2048m -XX:MetaspaceSize=256M -XX:MaxMetaspaceSize=512M"
TZ: "Europe/Berlin"
deployment.yaml
containers:
- name: {{ .Chart.Name }}
env:
{{- range $k, $v := .Values.env }}
- name: {{ $k | quote }}
value: {{ $v | quote }}
{{- end }}
Plan 3:
If you still need to follow your previous writing, then you can do this
values.yaml
env: |
ENVIRONMENT1=testABC
JAVA_OPTS=-Xms1024m -Xmx2048m -XX:MetaspaceSize=256M -XX:MaxMetaspaceSize=512M
TZ=Europe/Berlin
deployment.yaml
containers:
- name: {{ .Chart.Name }}
{{- if .Values.env }}
env:
{{- range (split "\n" .Values.env) }}
- name: {{ (split "=" .)._0 }}
value: {{ . | trimPrefix (split "=" .)._0 | trimPrefix "=" | quote }}
{{- end }}
{{- end }}
output:
env:
- name: ENVIRONMENT1
value: "testABC"
- name: JAVA_OPTS
value: "-Xms1024m -Xmx2048m -XX:MetaspaceSize=256M -XX:MaxMetaspaceSize=512M"
- name: TZ
value: "Europe/Berlin"