helm walk revision

helm-walk

#!/bin/bash

set -e
set -u
set -o pipefail

NAMESPACE=${1:-default}
RELEASE_NAME=${2:-}
KUBE_CONTEXT=${3:-""}

if [ -z "$RELEASE_NAME" ]; then
  echo "Usage: $0 <namespace> <release-name> [kube-context]"
  exit 1
fi

HELM_CMD=(helm --namespace "$NAMESPACE")
if [ -n "$KUBE_CONTEXT" ]; then
  HELM_CMD+=(--kube-context "$KUBE_CONTEXT")
fi

REVISIONS=$("${HELM_CMD[@]}" history "$RELEASE_NAME" -o json | jq -r '.[].revision')

mapfile -t REVISION_ARRAY <<< "$REVISIONS"

if [ "${#REVISION_ARRAY[@]}" -lt 2 ]; then
  echo "Not enough revisions to compare."
  exit 0
fi

echo "Found revisions: ${REVISION_ARRAY[*]}"

if command -v fzf &>/dev/null; then
  START_REVISION=$(printf "%s\n" "${REVISION_ARRAY[@]}" | fzf --prompt="Select starting revision: " --preview "${HELM_CMD[*]} history $RELEASE_NAME -o json | jq -r '.[] | select(.revision == \"{}\")' | jq")
else
  START_REVISION=${REVISION_ARRAY[0]}
fi

START_INDEX=0
for ((i = 0; i < ${#REVISION_ARRAY[@]}; i++)); do
  if [ "${REVISION_ARRAY[i]}" -eq "$START_REVISION" ]; then
    START_INDEX=$i
    break
  fi
done

if [ -n "$HELM_DIFF_TPL" ]; then
  HELM_CMD+=(--output "$HELM_DIFF_TPL")
fi


for ((i = START_INDEX; i < ${#REVISION_ARRAY[@]} - 1; i++)); do
  PREV_REV="${REVISION_ARRAY[i]}"
  CUR_REV="${REVISION_ARRAY[i+1]}"

  echo "========================================"
  echo "🔍 Comparing revisions $PREV_REV → $CUR_REV"
  echo "========================================"

  "${HELM_CMD[@]}" diff revision "$RELEASE_NAME" "$PREV_REV" "$CUR_REV"

  echo -e "\nDiff: $PREV_REV → $CUR_REV\nPress Enter to continue..."
  read -r
done

echo "✅ Completed revision walkthrough."