Safely diff helm charts between two cluster contexts

helm-diff.sh

#!/usr/bin/env bash
set -o errexit
set -o nounset

# ./diff-helm $chart $namespace

CHART=${1}
NAMESPACE=${2}
CTX_ONE="coronita"
CTX_TWO="corona"
OBJECTS="all" # all, manifest, values
DIFF_CMD="/opt/homebrew/bin/diff --color -urN" # needs gnu diffutils - brew install diffutils

CTX_ONE_FILE=$(mktemp)
CTX_TWO_FILE=$(mktemp)
trap "rm -f $CTX_ONE_FILE $CTX_TWO_FILE" EXIT

HELM_KUBECONTEXT=$CTX_ONE helm get manifest $CHART -n $NAMESPACE > $CTX_ONE_FILE
HELM_KUBECONTEXT=$CTX_TWO helm get manifest $CHART -n $NAMESPACE > $CTX_TWO_FILE

$DIFF_CMD $CTX_ONE_FILE $CTX_TWO_FILE

you can use stdout in diffs if you want

diff <(echo bla) <(echo blad)