using curl command in pod lifecycle poststart hooks - kubernetes

Question

I was trying to add a poststart hook for my pod using curl, say sending a message to my slack channel
in shell, the command looks like this
curl -d "text=Hi I am a bot that can post messages to any public channel." -d "channel=C1234567" -H "Authorization: Bearer xoxb-xxxxxxxxxxxxxxxx" -X POST https://slack.com/api/chat.postMessage
and in my pod definition, i tried sth like this
apiVersion: v1
kind: Pod
metadata:
name: dapi-test-pod
spec:
containers:
- name: test-container
image: curlimages/curl
env:
- name: TOKEN
valueFrom:
configMapKeyRef:
name: my-config
key: token
command: ["sleep"]
args: ["3000"]
lifecycle:
postStart:
exec:
command:
- "sh"
- "-c"
- |
curl -d "text=Hi going to start." -d "channel=C1234567" -H "Authorization: Bearer $(TOKEN)" -X POST https://slack.com/api/chat.postMessage
Unlike the container->command, it has args parameter which i could pass multi line command with quote, but in lifecycle->poststart->exec->command it doesn't support args parameter
I also tried sth like but no luck
command: ["curl","-d","text=Hi going to start.",....]
but i never got my slack message
My question is, how can i pass long curl command with quote in lifecycle->poststart->exec->command?

Answer 1

it finally solved by replacing () with {}
to use a env variable in command, it should be ${TOKEN}