CheckDeploymentStatus.sh

echo "k8s can die in a 🔥 after being consumed and 💩 out by satan after eating a triple-spicy kebab"

echo "$NAMESPACE"
echo "$DEPLOYMENT"

# Get latest replica set version
rev="`kubectl get deployment -n $NAMESPACE $DEPLOYMENT -o jsonpath=\"{.metadata.annotations.deployment\.kubernetes\.io/revision}\"`"

echo "Latest replica set version: $rev"

# Get replica set name from latest version
rs=$(kubectl get rs -n mizeees-dev -o json | \
  jq -r --arg REV "$rev" --arg OWNER "$DEPLOYMENT" '.items[] | select(.metadata.annotations["deployment.kubernetes.io/revision"] == $REV and .metadata.ownerReferences[].name == $OWNER) | .metadata.name')

echo "Replica set name: $rs"

# Get label selector from the ReplicaSet
selector=$(kubectl get rs $rs -n $NAMESPACE -o json | jq -r '.spec.selector.matchLabels | to_entries | map("\(.key)=\(.value)") | join(",")')

echo "Selector: $selector"

phase_pending=true
has_crashloop=false
status_ready=false

while [[ ("$phase_pending" == true || "$status_ready" == false) && ! "$has_crashloop" == true ]]; do
  sleep 1

  phases=$(kubectl get pods -l "$selector" -n $NAMESPACE -o jsonpath='{range .items[*]}{.status.phase}{";"}{end}')
  phase_pending=$(echo "$phases" | grep -q "Pending" && echo true || echo false)

  echo "Phases: $phases"

  # Only check init container status if pods are still pending (trying to start)
  if [ "$phase_pending" == true ]; then

    # Getting statuses
    statuses=$(kubectl get pods -l "$selector" -n $NAMESPACE -o jsonpath='{range .items[*]}{range .status.initContainerStatuses[*]}{.state.waiting.reason}{";"}{end}')

    echo "Init Container Statuses: $statuses"

    if [ -n "$statuses" ]; then

      # Check for CrashLoopBackOff in any init containers
      has_crashloop=$(echo "$statuses" | grep -q "CrashLoopBackOff" && echo true || echo false)

      echo "Init Container CrashLoopBackOff detected: $has_crashloop"
    fi
  else # Check container statuses

    # Getting statuses
    statuses=$(kubectl get pods -l "$selector" -n $NAMESPACE -o jsonpath='{range .items[*]}{range .status.containerStatuses[*]}{.state.waiting.reason}{";"}{end}')

    echo "Container Waiting Reasons: $statuses"

    if [ -n "$statuses" ]; then

      # Check for CrashLoopBackOff in any containers
      has_crashloop=$(echo "$statuses" | grep -q "CrashLoopBackOff" && echo true || echo false)

      echo "Container CrashLoopBackOff detected: $has_crashloop"
    fi

    # If no crash loop detected, check if all containers are ready
    if [ "$has_crashloop" == false ]; then
        
      ready_statuses=$(kubectl get pods -l "$selector" -n $NAMESPACE -o jsonpath='{range .items[*]}{range .status.containerStatuses[*]}{.ready}{";"}{end}')

      echo "Ready statuses: $ready_statuses"

      # Create array from statutes
      IFS=';' read -ra ready_status_arr <<<"$ready_statuses"
      status_ready=true

      for ready_status in "${ready_status_arr[@]}"; do
        if [[ "$ready_status" != true && "$status_ready" == true ]]; then
          echo "Detected non-true ready status: $ready_status"
          status_ready=false
        fi
      done

      echo "All containers ready: $status_ready"
    fi

  fi

done

if [[ "$has_crashloop" == true ]]; then
  echo "❌ One or more pods are in CrashLoopBackOff"
  exit 1
else
  echo "✅ No CrashLoopBackOff detected"
fi