Helm diff

This is a great plugin for helm.

helm plugin install https://github.com/databus23/helm-diff

helm diff upgrade -n mynamespace myapp foo/myapp -f custom-values.yaml

You could use it like so

#!/bin/bash
lines=$(helm diff upgrade -n mynamespace myapp foo/myapp  -f custom-values.yaml)
if [[ $(echo $lines | wc -l) > 0 ]]; then
  echo "$lines" | grep "^+\|^-"
  echo "Helm changes detected."
  echo "Running upgrade in 5."; sleep 5  helm upgrade --install -n mynamespace myapp foo/myapp  -f custom-values.yaml
fi

You can use terraform helm provider as well.

https://registry.terraform.io/providers/hashicorp/helm/latest/docs/resources/release

#!/bin/bash
set -e

[[ $(helm repo list | grep ^external-secrets) ]] \
  || helm repo add external-secrets https://charts.external-secrets.io
[[ $(helm plugin list | grep ^diff) ]] \
  || helm plugin install https://github.com/databus23/helm-diff
helm diff version

kubectl create namespace external-secrets --dry-run=client -o yaml | kubectl apply -f -

helm_cmd(){
  helm $1 upgrade --install external-secrets \
    external-secrets/external-secrets \
    -n external-secrets \
    --set installCRDs=true
}

lines=$(helm_cmd diff)
if [[ $(echo -n "$lines" | wc -l) > 0 ]]; then
  echo "$lines" | grep "^+\|^-" || true
  echo "Helm changes detected."
  echo "Running helm upgrade in 5."; sleep 5
  helm_cmd
fi