20494412809

Committed 24 Dec 2025 09:50PM UTC coverage: 81.314% (+6.0%) from 75.355%

Build # 20494412809

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push

github

Committed by

lockwobr

Commit Message

feat: added new tests to cover the new webhook setup

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84.58

/operator/internal/controller/skyhook_controller.go

/*
 * SPDX-FileCopyrightText: Copyright (c) 2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 * SPDX-License-Identifier: Apache-2.0
 *
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package controller

import (
        "cmp"
        "context"
        "crypto/sha256"
        "encoding/hex"
        "encoding/json"
        "errors"
        "fmt"
        "reflect"
        "slices"
        "sort"
        "strings"
        "time"

        "github.com/NVIDIA/skyhook/operator/api/v1alpha1"
        "github.com/NVIDIA/skyhook/operator/internal/dal"
        "github.com/NVIDIA/skyhook/operator/internal/version"
        "github.com/NVIDIA/skyhook/operator/internal/wrapper"
        "github.com/go-logr/logr"

        corev1 "k8s.io/api/core/v1"
        policyv1 "k8s.io/api/policy/v1"
        apierrors "k8s.io/apimachinery/pkg/api/errors"
        "k8s.io/apimachinery/pkg/api/resource"
        metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
        "k8s.io/apimachinery/pkg/runtime"
        "k8s.io/apimachinery/pkg/types"
        utilerrors "k8s.io/apimachinery/pkg/util/errors"
        "k8s.io/client-go/tools/record"
        "k8s.io/kubernetes/pkg/util/taints"
        ctrl "sigs.k8s.io/controller-runtime"
        "sigs.k8s.io/controller-runtime/pkg/client"
        "sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
        "sigs.k8s.io/controller-runtime/pkg/handler"
        "sigs.k8s.io/controller-runtime/pkg/log"
        "sigs.k8s.io/controller-runtime/pkg/reconcile"
)

const (
        EventsReasonSkyhookApply       = "Apply"
        EventsReasonSkyhookInterrupt   = "Interrupt"
        EventsReasonSkyhookDrain       = "Drain"
        EventsReasonSkyhookStateChange = "State"
        EventsReasonNodeReboot         = "Reboot"
        EventTypeNormal                = "Normal"
        // EventTypeWarning = "Warning"
        TaintUnschedulable     = corev1.TaintNodeUnschedulable
        InterruptContainerName = "interrupt"

        SkyhookFinalizer = "skyhook.nvidia.com/skyhook"
)

type SkyhookOperatorOptions struct {
        Namespace            string        `env:"NAMESPACE, default=skyhook"`
        MaxInterval          time.Duration `env:"DEFAULT_INTERVAL, default=10m"`
        ImagePullSecret      string        `env:"IMAGE_PULL_SECRET, default=node-init-secret"` //TODO: should this be defaulted?
        CopyDirRoot          string        `env:"COPY_DIR_ROOT, default=/var/lib/skyhook"`
        ReapplyOnReboot      bool          `env:"REAPPLY_ON_REBOOT, default=false"`
        RuntimeRequiredTaint string        `env:"RUNTIME_REQUIRED_TAINT, default=skyhook.nvidia.com=runtime-required:NoSchedule"`
        PauseImage           string        `env:"PAUSE_IMAGE, default=registry.k8s.io/pause:3.10"`
        AgentImage           string        `env:"AGENT_IMAGE, default=ghcr.io/nvidia/skyhook/agent:latest"` // TODO: this needs to be updated with a working default
        AgentLogRoot         string        `env:"AGENT_LOG_ROOT, default=/var/log/skyhook"`
}

func (o *SkyhookOperatorOptions) Validate() error {

        messages := make([]string, 0)
        if o.Namespace == "" {
                messages = append(messages, "namespace must be set")
        }
        if o.CopyDirRoot == "" {
                messages = append(messages, "copy dir root must be set")
        }
        if o.RuntimeRequiredTaint == "" {
                messages = append(messages, "runtime required taint must be set")
        }
        if o.MaxInterval < time.Minute {
                messages = append(messages, "max interval must be at least 1 minute")
        }

        // CopyDirRoot must start with /
        if !strings.HasPrefix(o.CopyDirRoot, "/") {
                messages = append(messages, "copy dir root must start with /")
        }

        // RuntimeRequiredTaint must be parsable and must not be a deletion
        _, delete, err := taints.ParseTaints([]string{o.RuntimeRequiredTaint})
        if err != nil {
                messages = append(messages, fmt.Sprintf("runtime required taint is invalid: %s", err.Error()))
        }
        if len(delete) > 0 {
                messages = append(messages, "runtime required taint must not be a deletion")
        }

        if o.AgentImage == "" {
                messages = append(messages, "agent image must be set")
        }

        if !strings.Contains(o.AgentImage, ":") {
                messages = append(messages, "agent image must contain a tag")
        }

        if o.PauseImage == "" {
                messages = append(messages, "pause image must be set")
        }

        if !strings.Contains(o.PauseImage, ":") {
                messages = append(messages, "pause image must contain a tag")
        }

        if len(messages) > 0 {
                return errors.New(strings.Join(messages, ", "))
        }

        return nil
}

// AgentVersion returns the image tag portion of AgentImage
func (o *SkyhookOperatorOptions) AgentVersion() string {
        parts := strings.Split(o.AgentImage, ":")
        return parts[len(parts)-1]
}

func (o *SkyhookOperatorOptions) GetRuntimeRequiredTaint() corev1.Taint {
        to_add, _, _ := taints.ParseTaints([]string{o.RuntimeRequiredTaint})
        return to_add[0]
}

func (o *SkyhookOperatorOptions) GetRuntimeRequiredToleration() corev1.Toleration {
        taint := o.GetRuntimeRequiredTaint()
        return corev1.Toleration{
                Key:      taint.Key,
                Operator: corev1.TolerationOpEqual,
                Value:    taint.Value,
                Effect:   taint.Effect,
        }
}

// force type checking against this interface
var _ reconcile.Reconciler = &SkyhookReconciler{}

func NewSkyhookReconciler(schema *runtime.Scheme, c client.Client, recorder record.EventRecorder, opts SkyhookOperatorOptions) (*SkyhookReconciler, error) {

        err := opts.Validate()
        if err != nil {
                return nil, fmt.Errorf("invalid skyhook operator options: %w", err)
        }

        return &SkyhookReconciler{
                Client:   c,
                scheme:   schema,
                recorder: recorder,
                opts:     opts,
                dal:      dal.New(c),
        }, nil
}

// SkyhookReconciler reconciles a Skyhook object
type SkyhookReconciler struct {
        client.Client
        scheme   *runtime.Scheme
        recorder record.EventRecorder
        opts     SkyhookOperatorOptions
        dal      dal.DAL
}

// SetupWithManager sets up the controller with the Manager.
func (r *SkyhookReconciler) SetupWithManager(mgr ctrl.Manager) error {

        // indexes allow for query on fields to use the local cache
        indexer := mgr.GetFieldIndexer()
        err := indexer.
                IndexField(context.TODO(), &corev1.Pod{}, "spec.nodeName", func(o client.Object) []string {
                        pod, ok := o.(*corev1.Pod)
                        if !ok {
                                return nil
                        }
                        return []string{pod.Spec.NodeName}
                })

        if err != nil {
                return err
        }

        ehandler := &eventHandler{
                logger: mgr.GetLogger(),
                dal:    dal.New(r.Client),
        }

        return ctrl.NewControllerManagedBy(mgr).
                For(&v1alpha1.Skyhook{}).
                Watches(
                        &corev1.Pod{},
                        handler.EnqueueRequestsFromMapFunc(podHandlerFunc),
                ).
                Watches(
                        &corev1.Node{},
                        ehandler,
                ).
                Complete(r)
}

// CRD Permissions
//+kubebuilder:rbac:groups=skyhook.nvidia.com,resources=skyhooks,verbs=get;list;watch;create;update;patch;delete
//+kubebuilder:rbac:groups=skyhook.nvidia.com,resources=skyhooks/status,verbs=get;update;patch
//+kubebuilder:rbac:groups=skyhook.nvidia.com,resources=skyhooks/finalizers,verbs=update
//+kubebuilder:rbac:groups=skyhook.nvidia.com,resources=deploymentpolicies,verbs=get;list;watch

// core permissions
//+kubebuilder:rbac:groups=core,resources=nodes,verbs=get;list;update;patch;watch
//+kubebuilder:rbac:groups=core,resources=nodes/status,verbs=get;update;patch
//+kubebuilder:rbac:groups=core,resources=pods/eviction,verbs=create
//+kubebuilder:rbac:groups=core,resources=events,verbs=create;patch
//+kubebuilder:rbac:groups=core,resources=configmaps,verbs=get;list;watch;create;update;patch;delete

// Reconcile is part of the main kubernetes reconciliation loop which aims to
// move the current state of the cluster closer to the desired state.
// - https://pkg.go.dev/sigs.k8s.io/controller-runtime@v0.16.3/pkg/reconcile
func (r *SkyhookReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
        logger := log.FromContext(ctx)
        // split off requests for pods
        if strings.HasPrefix(req.Name, "pod---") {
                name := strings.Split(req.Name, "pod---")[1]
                pod, err := r.dal.GetPod(ctx, req.Namespace, name)
                if err == nil && pod != nil { // if pod, then call other wise not a pod
                        return r.PodReconcile(ctx, pod)
                }
                return ctrl.Result{}, err
        }

        // get all skyhooks (SCR)
        skyhooks, err := r.dal.GetSkyhooks(ctx)
        if err != nil {
                // error, going to requeue and backoff
                logger.Error(err, "error getting skyhooks")
                return ctrl.Result{}, err
        }

        // if there are no skyhooks, so actually nothing to do, so don't requeue
        if skyhooks == nil || len(skyhooks.Items) == 0 {
                return ctrl.Result{}, nil
        }

        // get all nodes
        nodes, err := r.dal.GetNodes(ctx)
        if err != nil {
                // error, going to requeue and backoff
                logger.Error(err, "error getting nodes")
                return ctrl.Result{}, err
        }

        // if no nodes, well not work to do either
        if nodes == nil || len(nodes.Items) == 0 {
                // no nodes, so nothing to do
                return ctrl.Result{}, nil
        }

        // get all deployment policies
        deploymentPolicies, err := r.dal.GetDeploymentPolicies(ctx)
        if err != nil {
                logger.Error(err, "error getting deployment policies")
                return ctrl.Result{}, err
        }

        // TODO: this build state could error in a lot of ways, and I think we might want to move towards partial state
        // mean if we cant get on SCR state, great, process that one and error

        // BUILD cluster state from all skyhooks, and all nodes
        // this filters and pairs up nodes to skyhooks, also provides help methods for introspection and mutation
        clusterState, err := BuildState(skyhooks, nodes, deploymentPolicies)
        if err != nil {
                // error, going to requeue and backoff
                logger.Error(err, "error building cluster state")
                return ctrl.Result{}, err
        }

        if yes, result, err := shouldReturn(r.HandleMigrations(ctx, clusterState)); yes {
                return result, err
        }

        if yes, result, err := shouldReturn(r.TrackReboots(ctx, clusterState)); yes {
                return result, err
        }

        // node picker is for selecting nodes to do work, tries maintain a prior of nodes between SCRs
        nodePicker := NewNodePicker(logger, r.opts.GetRuntimeRequiredToleration())

        errs := make([]error, 0)
        var result *ctrl.Result

        for _, skyhook := range clusterState.skyhooks {
                if yes, result, err := shouldReturn(r.HandleFinalizer(ctx, skyhook)); yes {
                        return result, err
                }

                if yes, result, err := shouldReturn(r.ReportState(ctx, clusterState, skyhook)); yes {
                        return result, err
                }

                if skyhook.IsPaused() {
                        if yes, result, err := shouldReturn(r.UpdatePauseStatus(ctx, clusterState, skyhook)); yes {
                                return result, err
                        }
                        continue
                }

                if yes, result, err := r.validateAndUpsertSkyhookData(ctx, skyhook, clusterState); yes {
                        return result, err
                }

                changed := IntrospectSkyhook(skyhook, clusterState.skyhooks)
                if changed {
                        _, errs := r.SaveNodesAndSkyhook(ctx, clusterState, skyhook)
                        if len(errs) > 0 {
                                return ctrl.Result{RequeueAfter: time.Second * 2}, utilerrors.NewAggregate(errs)
                        }
                        return ctrl.Result{RequeueAfter: time.Second * 2}, nil
                }

                _, err := HandleVersionChange(skyhook)
                if err != nil {
                        return ctrl.Result{RequeueAfter: time.Second * 2}, fmt.Errorf("error getting packages to uninstall: %w", err)
                }
        }

        skyhook := GetNextSkyhook(clusterState.skyhooks)
        if skyhook != nil && !skyhook.IsPaused() {

                result, err = r.RunSkyhookPackages(ctx, clusterState, nodePicker, skyhook)
                if err != nil {
                        logger.Error(err, "error processing skyhook", "skyhook", skyhook.GetSkyhook().Name)
                        errs = append(errs, err)
                }
        }

        err = r.HandleRuntimeRequired(ctx, clusterState)
        if err != nil {
                errs = append(errs, err)
        }

        if len(errs) > 0 {
                err := utilerrors.NewAggregate(errs)
                return ctrl.Result{}, err
        }

        if result != nil {
                return *result, nil
        }

        // default happy retry after max
        return ctrl.Result{RequeueAfter: r.opts.MaxInterval}, nil
}

func shouldReturn(updates bool, err error) (bool, ctrl.Result, error) {
        if err != nil {
                return true, ctrl.Result{}, err
        }
        if updates {
                return true, ctrl.Result{RequeueAfter: time.Second * 2}, nil
        }
        return false, ctrl.Result{}, nil
}

func (r *SkyhookReconciler) HandleMigrations(ctx context.Context, clusterState *clusterState) (bool, error) {

        updates := false

        if version.VERSION == "" {
                // this means the binary was complied without version information
                return false, nil
        }

        logger := log.FromContext(ctx)
        errors := make([]error, 0)
        for _, skyhook := range clusterState.skyhooks {

                err := skyhook.Migrate(logger)
                if err != nil {
                        return false, fmt.Errorf("error migrating skyhook [%s]: %w", skyhook.GetSkyhook().Name, err)
                }

                if err := skyhook.GetSkyhook().Skyhook.Validate(); err != nil {
                        return false, fmt.Errorf("error validating skyhook [%s]: %w", skyhook.GetSkyhook().Name, err)
                }

                for _, node := range skyhook.GetNodes() {
                        if node.Changed() {
                                err := r.Status().Patch(ctx, node.GetNode(), client.MergeFrom(clusterState.tracker.GetOriginal(node.GetNode())))
                                if err != nil {
                                        errors = append(errors, fmt.Errorf("error patching node [%s]: %w", node.GetNode().Name, err))
                                }

                                err = r.Patch(ctx, node.GetNode(), client.MergeFrom(clusterState.tracker.GetOriginal(node.GetNode())))
                                if err != nil {
                                        errors = append(errors, fmt.Errorf("error patching node [%s]: %w", node.GetNode().Name, err))
                                }
                                updates = true
                        }
                }

                if skyhook.GetSkyhook().Updated {
                        // need to do this because SaveNodesAndSkyhook only saves skyhook status, not the main skyhook object where the annotations are
                        // additionally it needs to be an update, a patch nils out the annotations for some reason, which the save function does a patch

                        if err = r.Status().Update(ctx, skyhook.GetSkyhook().Skyhook); err != nil {
                                return false, fmt.Errorf("error updating during migration skyhook status [%s]: %w", skyhook.GetSkyhook().Name, err)
                        }

                        // because of conflict issues (409) we need to do things a bit differently here.
                        // We might be able to use server side apply in the future, but for now we need to do this
                        // https://kubernetes.io/docs/reference/using-api/server-side-apply/
                        // https://github.com/kubernetes-sigs/controller-runtime/issues/347

                        // work around for now is to grab a new copy of the object, and then patch it

                        newskyhook, err := r.dal.GetSkyhook(ctx, skyhook.GetSkyhook().Name)
                        if err != nil {
                                return false, fmt.Errorf("error getting skyhook to migrate [%s]: %w", skyhook.GetSkyhook().Name, err)
                        }
                        newPatch := client.MergeFrom(newskyhook.DeepCopy())

                        // set version
                        wrapper.NewSkyhookWrapper(newskyhook).SetVersion()

                        if err = r.Patch(ctx, newskyhook, newPatch); err != nil {
                                return false, fmt.Errorf("error updating during migration skyhook [%s]: %w", skyhook.GetSkyhook().Name, err)
                        }

                        updates = true
                }
        }

        if len(errors) > 0 {
                return false, utilerrors.NewAggregate(errors)
        }

        return updates, nil
}

// ReportState computes and puts important information into the skyhook status so that monitoring tools such as k9s
// can see the information at a glance. For example, the number of completed nodes and the list of packages in the skyhook.
func (r *SkyhookReconciler) ReportState(ctx context.Context, clusterState *clusterState, skyhook SkyhookNodes) (bool, error) {

        // save updated state to skyhook status
        skyhook.ReportState()

        if skyhook.GetSkyhook().Updated {
                _, errs := r.SaveNodesAndSkyhook(ctx, clusterState, skyhook)
                if len(errs) > 0 {
                        return false, utilerrors.NewAggregate(errs)
                }
                return true, nil
        }

        return false, nil
}

func (r *SkyhookReconciler) UpdatePauseStatus(ctx context.Context, clusterState *clusterState, skyhook SkyhookNodes) (bool, error) {
        changed := UpdateSkyhookPauseStatus(skyhook)

        if changed {
                _, errs := r.SaveNodesAndSkyhook(ctx, clusterState, skyhook)
                if len(errs) > 0 {
                        return false, utilerrors.NewAggregate(errs)
                }
                return true, nil
        }

        return false, nil
}

func (r *SkyhookReconciler) TrackReboots(ctx context.Context, clusterState *clusterState) (bool, error) {

        updates := false
        errs := make([]error, 0)

        for _, skyhook := range clusterState.skyhooks {
                if skyhook.GetSkyhook().Status.NodeBootIds == nil {
                        skyhook.GetSkyhook().Status.NodeBootIds = make(map[string]string)
                }

                for _, node := range skyhook.GetNodes() {
                        id, ok := skyhook.GetSkyhook().Status.NodeBootIds[node.GetNode().Name]

                        if !ok { // new node
                                skyhook.GetSkyhook().Status.NodeBootIds[node.GetNode().Name] = node.GetNode().Status.NodeInfo.BootID
                                skyhook.GetSkyhook().Updated = true
                        }

                        if id != "" && id != node.GetNode().Status.NodeInfo.BootID { // node rebooted
                                if r.opts.ReapplyOnReboot {
                                        r.recorder.Eventf(skyhook.GetSkyhook().Skyhook, EventTypeNormal, EventsReasonNodeReboot, "detected reboot, resetting node [%s] to be reapplied", node.GetNode().Name)
                                        r.recorder.Eventf(node.GetNode(), EventTypeNormal, EventsReasonNodeReboot, "detected reboot, resetting node for [%s] to be reapplied", node.GetSkyhook().Name)
                                        node.Reset()
                                }
                                skyhook.GetSkyhook().Status.NodeBootIds[node.GetNode().Name] = node.GetNode().Status.NodeInfo.BootID
                                skyhook.GetSkyhook().Updated = true
                        }

                        if node.Changed() { // update
                                updates = true
                                err := r.Update(ctx, node.GetNode())
                                if err != nil {
                                        errs = append(errs, fmt.Errorf("error updating node after reboot [%s]: %w", node.GetNode().Name, err))
                                }
                        }
                }
                if skyhook.GetSkyhook().Updated { // update
                        updates = true
                        err := r.Status().Update(ctx, skyhook.GetSkyhook().Skyhook)
                        if err != nil {
                                errs = append(errs, fmt.Errorf("error updating skyhook status after reboot [%s]: %w", skyhook.GetSkyhook().Name, err))
                        }
                }
        }

        return updates, utilerrors.NewAggregate(errs)
}

// RunSkyhookPackages runs all skyhook packages then saves and requeues if changes were made
func (r *SkyhookReconciler) RunSkyhookPackages(ctx context.Context, clusterState *clusterState, nodePicker *NodePicker, skyhook SkyhookNodes) (*ctrl.Result, error) {

        logger := log.FromContext(ctx)
        requeue := false

        toUninstall, err := HandleVersionChange(skyhook)
        if err != nil {
                return nil, fmt.Errorf("error getting packages to uninstall: %w", err)
        }

        changed := IntrospectSkyhook(skyhook, clusterState.skyhooks)
        if !changed && skyhook.IsComplete() {
                return nil, nil
        }

        selectedNode := nodePicker.SelectNodes(skyhook)

        for _, node := range selectedNode {

                if node.IsComplete() && !node.Changed() {
                        continue
                }

                toRun, err := node.RunNext()
                if err != nil {
                        return nil, fmt.Errorf("error getting next packages to run: %w", err)
                }

                // prepend the uninstall packages so they are ran first
                toRun = append(toUninstall, toRun...)

                interrupt, pack := fudgeInterruptWithPriority(toRun, skyhook.GetSkyhook().GetConfigUpdates(), skyhook.GetSkyhook().GetConfigInterrupts())

                for _, f := range toRun {

                        ok, err := r.ProcessInterrupt(ctx, node, f, interrupt, interrupt != nil && f.Name == pack)
                        if err != nil {
                                // TODO: error handle
                                return nil, fmt.Errorf("error processing if we should interrupt [%s:%s]: %w", f.Name, f.Version, err)
                        }
                        if !ok {
                                requeue = true
                                continue
                        }

                        err = r.ApplyPackage(ctx, logger, clusterState, node, f, interrupt != nil && f.Name == pack)
                        if err != nil {
                                return nil, fmt.Errorf("error applying package [%s:%s]: %w", f.Name, f.Version, err)
                        }

                        // process one package at a time
                        if skyhook.GetSkyhook().Spec.Serial {
                                return &ctrl.Result{Requeue: true}, nil
                        }
                }
        }

        saved, errs := r.SaveNodesAndSkyhook(ctx, clusterState, skyhook)
        if len(errs) > 0 {
                return &ctrl.Result{}, utilerrors.NewAggregate(errs)
        }
        if saved {
                requeue = true
        }

        if !skyhook.IsComplete() || requeue {
                return &ctrl.Result{RequeueAfter: time.Second * 2}, nil // not sure this is better then just requeue bool
        }

        return nil, utilerrors.NewAggregate(errs)
}

// SaveNodesAndSkyhook saves nodes and skyhook and will update the events if the skyhook status changes
func (r *SkyhookReconciler) SaveNodesAndSkyhook(ctx context.Context, clusterState *clusterState, skyhook SkyhookNodes) (bool, []error) {
        saved := false
        errs := make([]error, 0)

        for _, node := range skyhook.GetNodes() {
                patch := client.StrategicMergeFrom(clusterState.tracker.GetOriginal(node.GetNode()))
                if node.Changed() {
                        err := r.Patch(ctx, node.GetNode(), patch)
                        if err != nil {
                                errs = append(errs, fmt.Errorf("error patching node [%s]: %w", node.GetNode().Name, err))
                        }
                        saved = true

                        err = r.UpsertNodeLabelsAnnotationsPackages(ctx, skyhook.GetSkyhook(), node.GetNode())
                        if err != nil {
                                errs = append(errs, fmt.Errorf("error upserting labels, annotations, and packages config map for node [%s]: %w", node.GetNode().Name, err))
                        }

                        if node.IsComplete() {
                                r.recorder.Eventf(node.GetNode(), EventTypeNormal, EventsReasonSkyhookStateChange, "Skyhook [%s] complete.", skyhook.GetSkyhook().Name)

                                // since node is complete remove from priority
                                if _, ok := skyhook.GetSkyhook().Status.NodePriority[node.GetNode().Name]; ok {
                                        delete(skyhook.GetSkyhook().Status.NodePriority, node.GetNode().Name)
                                        skyhook.GetSkyhook().Updated = true
                                }
                        }
                }

                // updates node's condition
                node.UpdateCondition()
                if node.Changed() {
                        // conditions are in status
                        err := r.Status().Patch(ctx, node.GetNode(), patch)
                        if err != nil {
                                errs = append(errs, fmt.Errorf("error patching node status [%s]: %w", node.GetNode().Name, err))
                        }
                        saved = true
                }

                if node.GetSkyhook() != nil && node.GetSkyhook().Updated {
                        skyhook.GetSkyhook().Updated = true
                }
        }

        if skyhook.GetSkyhook().Updated {
                patch := client.MergeFrom(clusterState.tracker.GetOriginal(skyhook.GetSkyhook().Skyhook))
                err := r.Status().Patch(ctx, skyhook.GetSkyhook().Skyhook, patch)
                if err != nil {
                        errs = append(errs, err)
                }
                saved = true

                if skyhook.GetPriorStatus() != "" && skyhook.GetPriorStatus() != skyhook.Status() {
                        // we transitioned, fire event
                        r.recorder.Eventf(skyhook.GetSkyhook(), EventTypeNormal, EventsReasonSkyhookStateChange, "Skyhook transitioned [%s] -> [%s]", skyhook.GetPriorStatus(), skyhook.Status())
                }
        }

        if len(errs) > 0 {
                saved = false
        }
        return saved, errs
}

// HandleVersionChange updates the state for the node or skyhook if a version is changed on a package
func HandleVersionChange(skyhook SkyhookNodes) ([]*v1alpha1.Package, error) {
        toUninstall := make([]*v1alpha1.Package, 0)

        for _, node := range skyhook.GetNodes() {
                nodeState, err := node.State()
                if err != nil {
                        return nil, err
                }

                for _, packageStatus := range nodeState {
                        upgrade := false

                        _package, exists := skyhook.GetSkyhook().Spec.Packages[packageStatus.Name]
                        if exists && _package.Version == packageStatus.Version {
                                continue // no uninstall needed for package
                        }

                        packageStatusRef := v1alpha1.PackageRef{
                                Name:    packageStatus.Name,
                                Version: packageStatus.Version,
                        }

                        if !exists && packageStatus.Stage != v1alpha1.StageUninstall {
                                // Start uninstall of old package
                                err := node.Upsert(packageStatusRef, packageStatus.Image, v1alpha1.StateInProgress, v1alpha1.StageUninstall, 0, "")
                                if err != nil {
                                        return nil, fmt.Errorf("error updating node status: %w", err)
                                }
                        } else if exists && _package.Version != packageStatus.Version {
                                comparison := version.Compare(_package.Version, packageStatus.Version)
                                if comparison == -2 {
                                        return nil, errors.New("error comparing package versions: invalid version string provided enabling webhooks validates versions before being applied")
                                }

                                if comparison == 1 {
                                        _packageStatus, found := node.PackageStatus(_package.GetUniqueName())
                                        if found && _packageStatus.Stage == v1alpha1.StageUpgrade {
                                                continue
                                        }

                                        // start upgrade of package
                                        err := node.Upsert(_package.PackageRef, _package.Image, v1alpha1.StateInProgress, v1alpha1.StageUpgrade, 0, _package.ContainerSHA)
                                        if err != nil {
                                                return nil, fmt.Errorf("error updating node status: %w", err)
                                        }

                                        upgrade = true
                                } else if comparison == -1 && packageStatus.Stage != v1alpha1.StageUninstall {
                                        // Start uninstall of old package
                                        err := node.Upsert(packageStatusRef, packageStatus.Image, v1alpha1.StateInProgress, v1alpha1.StageUninstall, 0, "")
                                        if err != nil {
                                                return nil, fmt.Errorf("error updating node status: %w", err)
                                        }

                                        // If version changed then update new version to wait
                                        err = node.Upsert(_package.PackageRef, _package.Image, v1alpha1.StateSkipped, v1alpha1.StageUninstall, 0, _package.ContainerSHA)
                                        if err != nil {
                                                return nil, fmt.Errorf("error updating node status: %w", err)
                                        }
                                }
                        }

                        // only need to create a feaux package for uninstall since it won't be in the DAG (Upgrade will)
                        newPackageStatus, found := node.PackageStatus(packageStatusRef.GetUniqueName())
                        if !upgrade && found && newPackageStatus.Stage == v1alpha1.StageUninstall && newPackageStatus.State == v1alpha1.StateInProgress {
                                // create fake package with the info we can salvage from the node state
                                newPackage := &v1alpha1.Package{
                                        PackageRef: packageStatusRef,
                                        Image:      packageStatus.Image,
                                }

                                // Add package to uninstall list if it's not already present
                                found := false
                                for _, uninstallPackage := range toUninstall {
                                        if reflect.DeepEqual(uninstallPackage, newPackage) {
                                                found = true
                                        }
                                }

                                if !found {
                                        toUninstall = append(toUninstall, newPackage)
                                }
                        }

                        // remove all config updates for the package since it's being uninstalled or
                        // upgraded. NOTE: The config updates must be removed whenever the version changes
                        // or else the package interrupt may be skipped if there is one
                        skyhook.GetSkyhook().RemoveConfigUpdates(_package.Name)

                        // set the node and skyhook status to in progress
                        node.SetStatus(v1alpha1.StatusInProgress)
                }
        }

        return toUninstall, nil
}

// helper for get a point to a ref
func ptr[E any](e E) *E {
        return &e
}

// generateSafeName generates a consistent name for Kubernetes resources that is unique
// while staying within the specified character limit
func generateSafeName(maxLen int, nameParts ...string) string {
        name := strings.Join(nameParts, "-")
        // Replace dots with dashes as they're not allowed in resource names
        name = strings.ReplaceAll(name, ".", "-")

        unique := sha256.Sum256([]byte(name))
        uniqueStr := hex.EncodeToString(unique[:])[:8]

        maxlen := maxLen - len(uniqueStr) - 1
        if len(name) > maxlen {
                name = name[:maxlen]
        }

        return strings.ToLower(fmt.Sprintf("%s-%s", name, uniqueStr))
}

func (r *SkyhookReconciler) UpsertNodeLabelsAnnotationsPackages(ctx context.Context, skyhook *wrapper.Skyhook, node *corev1.Node) error {
        // No work to do if there is no labels or annotations for node
        if len(node.Labels) == 0 && len(node.Annotations) == 0 {
                return nil
        }

        annotations, err := json.Marshal(node.Annotations)
        if err != nil {
                return fmt.Errorf("error converting annotations into byte array: %w", err)
        }

        labels, err := json.Marshal(node.Labels)
        if err != nil {
                return fmt.Errorf("error converting labels into byte array: %w", err)
        }

        // marshal intermediary package metadata for the agent
        metadata := NewSkyhookMetadata(r.opts, skyhook)
        packages, err := metadata.Marshal()
        if err != nil {
                return fmt.Errorf("error converting packages into byte array: %w", err)
        }

        configMapName := generateSafeName(253, skyhook.Name, node.Name, "metadata")
        newCM := &corev1.ConfigMap{
                ObjectMeta: metav1.ObjectMeta{
                        Name:      configMapName,
                        Namespace: r.opts.Namespace,
                        Labels: map[string]string{
                                fmt.Sprintf("%s/skyhook-node-meta", v1alpha1.METADATA_PREFIX): skyhook.Name,
                        },
                        Annotations: map[string]string{
                                fmt.Sprintf("%s/name", v1alpha1.METADATA_PREFIX):      skyhook.Name,
                                fmt.Sprintf("%s/Node.name", v1alpha1.METADATA_PREFIX): node.Name,
                        },
                },
                Data: map[string]string{
                        "annotations.json": string(annotations),
                        "labels.json":      string(labels),
                        "packages.json":    string(packages),
                },
        }

        if err := ctrl.SetControllerReference(skyhook.Skyhook, newCM, r.scheme); err != nil {
                return fmt.Errorf("error setting ownership: %w", err)
        }

        existingConfigMap := &corev1.ConfigMap{}
        err = r.Get(ctx, client.ObjectKey{Namespace: r.opts.Namespace, Name: configMapName}, existingConfigMap)
        if err != nil {
                if apierrors.IsNotFound(err) {
                        // create
                        err := r.Create(ctx, newCM)
                        if err != nil {
                                return fmt.Errorf("error creating config map [%s]: %w", newCM.Name, err)
                        }
                } else {
                        return fmt.Errorf("error getting config map: %w", err)
                }
        } else {
                if !reflect.DeepEqual(existingConfigMap.Data, newCM.Data) {
                        // update
                        err := r.Update(ctx, newCM)
                        if err != nil {
                                return fmt.Errorf("error updating config map [%s]: %w", newCM.Name, err)
                        }
                }
        }

        return nil
}

// HandleConfigUpdates checks whether the configMap on a package was updated and if it was the configmap will
// be updated and the package will be put into config mode if the package is complete or erroring
func (r *SkyhookReconciler) HandleConfigUpdates(ctx context.Context, clusterState *clusterState, skyhook SkyhookNodes, _package v1alpha1.Package, oldConfigMap, newConfigMap *corev1.ConfigMap) (bool, error) {
        completedNodes, nodeCount := 0, len(skyhook.GetNodes())
        erroringNode := false

        // if configmap changed
        if !reflect.DeepEqual(oldConfigMap.Data, newConfigMap.Data) {
                for _, node := range skyhook.GetNodes() {
                        exists, err := r.PodExists(ctx, node.GetNode().Name, skyhook.GetSkyhook().Name, &_package)
                        if err != nil {
                                return false, err
                        }

                        if !exists && node.IsPackageComplete(_package) {
                                completedNodes++
                        }

                        // if we have an erroring node in the config, interrupt, or post-interrupt mode
                        // then we will restart the config changes
                        if packageStatus, found := node.PackageStatus(_package.GetUniqueName()); found {
                                switch packageStatus.Stage {
                                case v1alpha1.StageConfig, v1alpha1.StageInterrupt, v1alpha1.StagePostInterrupt:
                                        if packageStatus.State == v1alpha1.StateErroring {
                                                erroringNode = true

                                                // delete the erroring pod from the node so that it can be recreated
                                                // with the updated configmap
                                                pods, err := r.dal.GetPods(ctx,
                                                        client.MatchingFields{
                                                                "spec.nodeName": node.GetNode().Name,
                                                        },
                                                        client.MatchingLabels{
                                                                fmt.Sprintf("%s/name", v1alpha1.METADATA_PREFIX):    skyhook.GetSkyhook().Name,
                                                                fmt.Sprintf("%s/package", v1alpha1.METADATA_PREFIX): fmt.Sprintf("%s-%s", _package.Name, _package.Version),
                                                        },
                                                )
                                                if err != nil {
                                                        return false, err
                                                }

                                                if pods != nil {
                                                        for _, pod := range pods.Items {
                                                                err := r.Delete(ctx, &pod)
                                                                if err != nil {
                                                                        return false, err
                                                                }
                                                        }
                                                }
                                        }
                                }
                        }
                }

                // if the update is complete or there is an erroring node put the package back into
                // the config mode and update the config map
                if completedNodes == nodeCount || erroringNode {
                        // get the keys in the configmap that changed
                        newConfigUpdates := make([]string, 0)
                        for key, new_val := range newConfigMap.Data {
                                if old_val, exists := oldConfigMap.Data[key]; !exists || old_val != new_val {
                                        newConfigUpdates = append(newConfigUpdates, key)
                                }
                        }

                        // if updates completed then clear out old config updates as they are finished
                        if completedNodes == nodeCount {
                                skyhook.GetSkyhook().RemoveConfigUpdates(_package.Name)
                        }

                        // Add the new changed keys to the config updates
                        skyhook.GetSkyhook().AddConfigUpdates(_package.Name, newConfigUpdates...)

                        for _, node := range skyhook.GetNodes() {
                                err := node.Upsert(_package.PackageRef, _package.Image, v1alpha1.StateInProgress, v1alpha1.StageConfig, 0, _package.ContainerSHA)
                                if err != nil {
                                        return false, fmt.Errorf("error upserting node status [%s]: %w", node.GetNode().Name, err)
                                }

                                node.SetStatus(v1alpha1.StatusInProgress)
                        }

                        _, errs := r.SaveNodesAndSkyhook(ctx, clusterState, skyhook)
                        if len(errs) > 0 {
                                return false, utilerrors.NewAggregate(errs)
                        }

                        // update config map
                        err := r.Update(ctx, newConfigMap)
                        if err != nil {
                                return false, fmt.Errorf("error updating config map [%s]: %w", newConfigMap.Name, err)
                        }

                        return true, nil
                }
        }

        return false, nil
}

func (r *SkyhookReconciler) UpsertConfigmaps(ctx context.Context, skyhook SkyhookNodes, clusterState *clusterState) (bool, error) {
        updated := false

        var list corev1.ConfigMapList
        err := r.List(ctx, &list, client.InNamespace(r.opts.Namespace), client.MatchingLabels{fmt.Sprintf("%s/name", v1alpha1.METADATA_PREFIX): skyhook.GetSkyhook().Name})
        if err != nil {
                return false, fmt.Errorf("error listing config maps while upserting: %w", err)
        }

        existingCMs := make(map[string]corev1.ConfigMap)
        for _, cm := range list.Items {
                existingCMs[cm.Name] = cm
        }

        // clean up from an update
        shouldExist := make(map[string]struct{})
        for _, _package := range skyhook.GetSkyhook().Spec.Packages {
                shouldExist[strings.ToLower(fmt.Sprintf("%s-%s-%s", skyhook.GetSkyhook().Name, _package.Name, _package.Version))] = struct{}{}
        }

        for k, v := range existingCMs {
                if _, ok := shouldExist[k]; !ok {
                        // delete
                        err := r.Delete(ctx, &v)
                        if err != nil {
                                return false, fmt.Errorf("error deleting existing config map [%s] while upserting: %w", v.Name, err)
                        }
                }
        }

        for _, _package := range skyhook.GetSkyhook().Spec.Packages {
                if len(_package.ConfigMap) > 0 {

                        newCM := &corev1.ConfigMap{
                                ObjectMeta: metav1.ObjectMeta{
                                        Name:      strings.ToLower(fmt.Sprintf("%s-%s-%s", skyhook.GetSkyhook().Name, _package.Name, _package.Version)),
                                        Namespace: r.opts.Namespace,
                                        Labels: map[string]string{
                                                fmt.Sprintf("%s/name", v1alpha1.METADATA_PREFIX): skyhook.GetSkyhook().Name,
                                        },
                                        Annotations: map[string]string{
                                                fmt.Sprintf("%s/name", v1alpha1.METADATA_PREFIX):            skyhook.GetSkyhook().Name,
                                                fmt.Sprintf("%s/Package.Name", v1alpha1.METADATA_PREFIX):    _package.Name,
                                                fmt.Sprintf("%s/Package.Version", v1alpha1.METADATA_PREFIX): _package.Version,
                                        },
                                },
                                Data: _package.ConfigMap,
                        }
                        // set owner of CM to the SCR, which will clean up the CM in delete of the SCR
                        if err := ctrl.SetControllerReference(skyhook.GetSkyhook().Skyhook, newCM, r.scheme); err != nil {
                                return false, fmt.Errorf("error setting ownership of cm: %w", err)
                        }

                        if existingCM, ok := existingCMs[strings.ToLower(fmt.Sprintf("%s-%s-%s", skyhook.GetSkyhook().Name, _package.Name, _package.Version))]; ok {
                                updatedConfigMap, err := r.HandleConfigUpdates(ctx, clusterState, skyhook, _package, &existingCM, newCM)
                                if err != nil {
                                        return false, fmt.Errorf("error updating config map [%s]: %s", newCM.Name, err)
                                }
                                if updatedConfigMap {
                                        updated = true
                                }
                        } else {
                                // create
                                err := r.Create(ctx, newCM)
                                if err != nil {
                                        return false, fmt.Errorf("error creating config map [%s]: %w", newCM.Name, err)
                                }
                        }
                }
        }

        return updated, nil
}

func (r *SkyhookReconciler) IsDrained(ctx context.Context, skyhookNode wrapper.SkyhookNode) (bool, error) {

        pods, err := r.dal.GetPods(ctx, client.MatchingFields{
                "spec.nodeName": skyhookNode.GetNode().Name,
        })
        if err != nil {
                return false, err
        }

        if pods == nil || len(pods.Items) == 0 {
                return true, nil
        }

        // checking for any running or pending pods with no toleration to unschedulable
        // if its has an unschedulable toleration we can ignore
        for _, pod := range pods.Items {

                if ShouldEvict(&pod) {
                        return false, nil
                }

        }

        return true, nil
}

func ShouldEvict(pod *corev1.Pod) bool {
        switch pod.Status.Phase {
        case corev1.PodRunning, corev1.PodPending:

                for _, taint := range pod.Spec.Tolerations {
                        switch taint.Key {
                        case "node.kubernetes.io/unschedulable": // ignoring
                                return false
                        }
                }

                if len(pod.ObjectMeta.OwnerReferences) > 1 {
                        for _, owner := range pod.ObjectMeta.OwnerReferences {
                                if owner.Kind == "DaemonSet" { // ignoring
                                        return false
                                }
                        }
                }

                if pod.GetNamespace() == "kube-system" {
                        return false
                }

                return true
        }
        return false
}

// HandleFinalizer returns true only if we container is deleted and we handled it completely, else false
func (r *SkyhookReconciler) HandleFinalizer(ctx context.Context, skyhook SkyhookNodes) (bool, error) {
        if skyhook.GetSkyhook().DeletionTimestamp.IsZero() { // if not deleted, and does not have our finalizer, add it
                if !controllerutil.ContainsFinalizer(skyhook.GetSkyhook().Skyhook, SkyhookFinalizer) {
                        controllerutil.AddFinalizer(skyhook.GetSkyhook().Skyhook, SkyhookFinalizer)

                        if err := r.Update(ctx, skyhook.GetSkyhook().Skyhook); err != nil {
                                return false, fmt.Errorf("error updating skyhook to add finalizer: %w", err)
                        }
                }
        } else { // being delete, time to handle our
                if controllerutil.ContainsFinalizer(skyhook.GetSkyhook().Skyhook, SkyhookFinalizer) {

                        errs := make([]error, 0)

                        // zero out all the metrics related to this skyhook both skyhook and packages
                        zeroOutSkyhookMetrics(skyhook)

                        for _, node := range skyhook.GetNodes() {
                                patch := client.StrategicMergeFrom(node.GetNode().DeepCopy())

                                node.Uncordon()

                                // if this doesn't change the node then don't patch
                                if !node.Changed() {
                                        continue
                                }

                                err := r.Patch(ctx, node.GetNode(), patch)
                                if err != nil {
                                        errs = append(errs, fmt.Errorf("error patching node [%s] in finalizer: %w", node.GetNode().Name, err))
                                }
                        }

                        if len(errs) > 0 { // we errored, so we need to return error, otherwise we would release the skyhook when we didnt finish
                                return false, utilerrors.NewAggregate(errs)
                        }

                        controllerutil.RemoveFinalizer(skyhook.GetSkyhook().Skyhook, SkyhookFinalizer)
                        if err := r.Update(ctx, skyhook.GetSkyhook().Skyhook); err != nil {
                                return false, fmt.Errorf("error updating skyhook removing finalizer: %w", err)
                        }
                        // should be 1, and now 2. we want to set ObservedGeneration up to not trigger an logic from this update adding the finalizer
                        skyhook.GetSkyhook().Status.ObservedGeneration = skyhook.GetSkyhook().Status.ObservedGeneration + 1

                        if err := r.Status().Update(ctx, skyhook.GetSkyhook().Skyhook); err != nil {
                                return false, fmt.Errorf("error updating skyhook status: %w", err)
                        }

                        return true, nil
                }
        }
        return false, nil
}

// HasNonInterruptWork returns true if pods are running on the node that are either packages, or matches the SCR selector
func (r *SkyhookReconciler) HasNonInterruptWork(ctx context.Context, skyhookNode wrapper.SkyhookNode) (bool, error) {

        selector, err := metav1.LabelSelectorAsSelector(&skyhookNode.GetSkyhook().Spec.PodNonInterruptLabels)
        if err != nil {
                return false, fmt.Errorf("error creating selector: %w", err)
        }

        if selector.Empty() { // when selector is empty it does not do any selecting, ie will return all pods on node.
                return false, nil
        }

        pods, err := r.dal.GetPods(ctx,
                client.MatchingLabelsSelector{Selector: selector},
                client.MatchingFields{
                        "spec.nodeName": skyhookNode.GetNode().Name,
                },
        )
        if err != nil {
                return false, fmt.Errorf("error getting pods: %w", err)
        }

        if pods == nil || len(pods.Items) == 0 {
                return false, nil
        }

        for _, pod := range pods.Items {
                switch pod.Status.Phase {
                case corev1.PodRunning, corev1.PodPending:
                        return true, nil
                }
        }

        return false, nil
}

func (r *SkyhookReconciler) HasRunningPackages(ctx context.Context, skyhookNode wrapper.SkyhookNode) (bool, error) {
        pods, err := r.dal.GetPods(ctx,
                client.HasLabels{fmt.Sprintf("%s/name", v1alpha1.METADATA_PREFIX)},
                client.MatchingFields{
                        "spec.nodeName": skyhookNode.GetNode().Name,
                },
        )
        if err != nil {
                return false, fmt.Errorf("error getting pods: %w", err)
        }

        return pods != nil && len(pods.Items) > 0, nil
}

func (r *SkyhookReconciler) DrainNode(ctx context.Context, skyhookNode wrapper.SkyhookNode, _package *v1alpha1.Package) (bool, error) {
        drained, err := r.IsDrained(ctx, skyhookNode)
        if err != nil {
                return false, err
        }
        if drained {
                return true, nil
        }

        pods, err := r.dal.GetPods(ctx, client.MatchingFields{
                "spec.nodeName": skyhookNode.GetNode().Name,
        })
        if err != nil {
                return false, err
        }

        if pods == nil || len(pods.Items) == 0 {
                return true, nil
        }

        r.recorder.Eventf(skyhookNode.GetNode(), EventTypeNormal, EventsReasonSkyhookInterrupt,
                "draining node [%s] package [%s:%s] from [skyhook:%s]",
                skyhookNode.GetNode().Name,
                _package.Name,
                _package.Version,
                skyhookNode.GetSkyhook().Name,
        )

        errs := make([]error, 0)
        for _, pod := range pods.Items {

                if ShouldEvict(&pod) {
                        eviction := policyv1.Eviction{}
                        err := r.Client.SubResource("eviction").Create(ctx, &pod, &eviction)
                        if err != nil {
                                errs = append(errs, fmt.Errorf("error evicting pod [%s:%s]: %w", pod.Namespace, pod.Name, err))
                        }
                }
        }

        return len(errs) == 0, utilerrors.NewAggregate(errs)
}

// Interrupt should not be called unless safe to do so, IE already cordoned and drained
func (r *SkyhookReconciler) Interrupt(ctx context.Context, skyhookNode wrapper.SkyhookNode, _package *v1alpha1.Package, _interrupt *v1alpha1.Interrupt) error {

        hasPackagesRunning, err := r.HasRunningPackages(ctx, skyhookNode)
        if err != nil {
                return err
        }

        if hasPackagesRunning { // keep waiting...
                return nil
        }

        exists, err := r.PodExists(ctx, skyhookNode.GetNode().Name, skyhookNode.GetSkyhook().Name, _package)
        if err != nil {
                return err
        }
        if exists {
                // nothing to do here, already running
                return nil
        }

        argEncode, err := _interrupt.ToArgs()
        if err != nil {
                return fmt.Errorf("error creating interrupt args: %w", err)
        }

        pod := createInterruptPodForPackage(r.opts, _interrupt, argEncode, _package, skyhookNode.GetSkyhook(), skyhookNode.GetNode().Name)

        if err := SetPackages(pod, skyhookNode.GetSkyhook().Skyhook, _package.Image, v1alpha1.StageInterrupt, _package); err != nil {
                return fmt.Errorf("error setting package on interrupt: %w", err)
        }

        if err := ctrl.SetControllerReference(skyhookNode.GetSkyhook().Skyhook, pod, r.scheme); err != nil {
                return fmt.Errorf("error setting ownership: %w", err)
        }

        if err := r.Create(ctx, pod); err != nil {
                return fmt.Errorf("error creating interruption pod: %w", err)
        }

        _ = skyhookNode.Upsert(_package.PackageRef, _package.Image, v1alpha1.StateInProgress, v1alpha1.StageInterrupt, 0, _package.ContainerSHA)

        r.recorder.Eventf(skyhookNode.GetSkyhook().Skyhook, EventTypeNormal, EventsReasonSkyhookInterrupt,
                "Interrupting node [%s] package [%s:%s] from [skyhook:%s]",
                skyhookNode.GetNode().Name,
                _package.Name,
                _package.Version,
                skyhookNode.GetSkyhook().Name)

        return nil
}

// fudgeInterruptWithPriority takes a list of packages, interrupts, and configUpdates and returns the correct merged interrupt to run to handle all the packages
func fudgeInterruptWithPriority(next []*v1alpha1.Package, configUpdates map[string][]string, interrupts map[string][]*v1alpha1.Interrupt) (*v1alpha1.Interrupt, string) {
        var ret *v1alpha1.Interrupt
        var pack string

        // map interrupt to priority
        // A lower priority value means a higher priority and will be used in favor of anything with a higher value
        var priorities = map[v1alpha1.InterruptType]int{
                v1alpha1.REBOOT:               0,
                v1alpha1.RESTART_ALL_SERVICES: 1,
                v1alpha1.SERVICE:              2,
                v1alpha1.NOOP:                 3,
        }

        for _, _package := range next {

                if len(configUpdates[_package.Name]) == 0 {
                        interrupts[_package.Name] = []*v1alpha1.Interrupt{}
                        if _package.HasInterrupt() {
                                interrupts[_package.Name] = append(interrupts[_package.Name], _package.Interrupt)
                        }
                }
        }

        packageNames := make([]string, 0)
        for _, pkg := range next {
                packageNames = append(packageNames, pkg.Name)
        }
        sort.Strings(packageNames)

        for _, _package := range packageNames {
                _interrupts, ok := interrupts[_package]
                if !ok {
                        continue
                }

                for _, interrupt := range _interrupts {
                        if ret == nil { // prime ret, base case
                                ret = interrupt
                                pack = _package
                        }

                        // short circuit, reboot has highest priority
                        switch interrupt.Type {
                        case v1alpha1.REBOOT:
                                return interrupt, _package
                        }

                        // check if interrupt is higher priority using the priority_order
                        // A lower priority value means a higher priority
                        if priorities[interrupt.Type] < priorities[ret.Type] {
                                ret = interrupt
                                pack = _package
                        } else if priorities[interrupt.Type] == priorities[ret.Type] {
                                mergeInterrupt(ret, interrupt)
                        }
                }
        }

        return ret, pack // return merged interrupt and package
}

func mergeInterrupt(left, right *v1alpha1.Interrupt) {

        // make sure both are of type service
        if left.Type != v1alpha1.SERVICE || right.Type != v1alpha1.SERVICE {
                return
        }

        left.Services = merge(left.Services, right.Services)
}

func merge[T cmp.Ordered](left, right []T) []T {
        for _, r := range right {
                if !slices.Contains(left, r) {
                        left = append(left, r)
                }
        }
        slices.Sort(left)
        return left
}

// ValidateNodeConfigmaps validates that there are no orphaned or stale config maps for a node
func (r *SkyhookReconciler) ValidateNodeConfigmaps(ctx context.Context, skyhookName string, nodes []wrapper.SkyhookNode) (bool, error) {
        var list corev1.ConfigMapList
        err := r.List(ctx, &list, client.InNamespace(r.opts.Namespace), client.MatchingLabels{fmt.Sprintf("%s/skyhook-node-meta", v1alpha1.METADATA_PREFIX): skyhookName})
        if err != nil {
                return false, fmt.Errorf("error listing config maps: %w", err)
        }

        // No configmaps created by this skyhook, no work needs to be done
        if len(list.Items) == 0 {
                return false, nil
        }

        existingCMs := make(map[string]corev1.ConfigMap)
        for _, cm := range list.Items {
                existingCMs[cm.Name] = cm
        }

        shouldExist := make(map[string]struct{})
        for _, node := range nodes {
                shouldExist[generateSafeName(253, skyhookName, node.GetNode().Name, "metadata")] = struct{}{}
        }

        update := false
        errs := make([]error, 0)
        for k, v := range existingCMs {
                if _, ok := shouldExist[k]; !ok {
                        update = true
                        err := r.Delete(ctx, &v)
                        if err != nil {
                                errs = append(errs, fmt.Errorf("error deleting existing config map [%s]: %w", v.Name, err))
                        }
                }
        }

        // Ensure packages.json is present and up-to-date for expected configmaps
        skyhookCR, err := r.dal.GetSkyhook(ctx, skyhookName)
        if err != nil {
                return update, fmt.Errorf("error getting skyhook for metadata validation: %w", err)
        }
        skyhookWrapper := wrapper.NewSkyhookWrapper(skyhookCR)
        metadata := NewSkyhookMetadata(r.opts, skyhookWrapper)
        expectedBytes, err := metadata.Marshal()
        if err != nil {
                return update, fmt.Errorf("error marshalling metadata for validation: %w", err)
        }
        expected := string(expectedBytes)

        for i := range list.Items {
                cm := &list.Items[i]
                if _, ok := shouldExist[cm.Name]; !ok {
                        continue
                }
                if cm.Data == nil {
                        cm.Data = make(map[string]string)
                }
                if cm.Data["packages.json"] != expected {
                        cm.Data["packages.json"] = expected
                        if err := r.Update(ctx, cm); err != nil {
                                errs = append(errs, fmt.Errorf("error updating packages.json on config map [%s]: %w", cm.Name, err))
                        } else {
                                update = true
                        }
                }
        }

        return update, utilerrors.NewAggregate(errs)
}

// PodExists tests if this package is exists on a node.
func (r *SkyhookReconciler) PodExists(ctx context.Context, nodeName, skyhookName string, _package *v1alpha1.Package) (bool, error) {

        pods, err := r.dal.GetPods(ctx,
                client.MatchingFields{
                        "spec.nodeName": nodeName,
                },
                client.MatchingLabels{
                        fmt.Sprintf("%s/name", v1alpha1.METADATA_PREFIX):    skyhookName,
                        fmt.Sprintf("%s/package", v1alpha1.METADATA_PREFIX): fmt.Sprintf("%s-%s", _package.Name, _package.Version),
                },
        )
        if err != nil {
                return false, fmt.Errorf("error check from existing pods: %w", err)
        }

        if pods == nil || len(pods.Items) == 0 {
                return false, nil
        }
        return true, nil
}

// createInterruptPodForPackage returns the pod spec for an interrupt pod given an package
func createInterruptPodForPackage(opts SkyhookOperatorOptions, _interrupt *v1alpha1.Interrupt, argEncode string, _package *v1alpha1.Package, skyhook *wrapper.Skyhook, nodeName string) *corev1.Pod {
        copyDir := fmt.Sprintf("%s/%s/%s-%s-%s-%d",
                opts.CopyDirRoot,
                skyhook.Name,
                _package.Name,
                _package.Version,
                skyhook.UID,
                skyhook.Generation,
        )

        volumes := []corev1.Volume{
                {
                        Name: "root-mount",
                        VolumeSource: corev1.VolumeSource{
                                HostPath: &corev1.HostPathVolumeSource{
                                        Path: "/",
                                },
                        },
                },
                {
                        // node names in different CSPs might include dots which isn't allowed in volume names
                        // so we have to replace all dots with dashes
                        Name: generateSafeName(63, skyhook.Name, nodeName, "metadata"),
                        VolumeSource: corev1.VolumeSource{
                                ConfigMap: &corev1.ConfigMapVolumeSource{
                                        LocalObjectReference: corev1.LocalObjectReference{
                                                Name: strings.ReplaceAll(fmt.Sprintf("%s-%s-metadata", skyhook.Name, nodeName), ".", "-"),
                                        },
                                },
                        },
                },
        }
        volumeMounts := []corev1.VolumeMount{
                {
                        Name:             "root-mount",
                        MountPath:        "/root",
                        MountPropagation: ptr(corev1.MountPropagationHostToContainer),
                },
        }

        pod := &corev1.Pod{
                ObjectMeta: metav1.ObjectMeta{
                        Name:      generateSafeName(63, skyhook.Name, "interrupt", string(_interrupt.Type), nodeName),
                        Namespace: opts.Namespace,
                        Labels: map[string]string{
                                fmt.Sprintf("%s/name", v1alpha1.METADATA_PREFIX):      skyhook.Name,
                                fmt.Sprintf("%s/package", v1alpha1.METADATA_PREFIX):   fmt.Sprintf("%s-%s", _package.Name, _package.Version),
                                fmt.Sprintf("%s/interrupt", v1alpha1.METADATA_PREFIX): "True",
                        },
                },
                Spec: corev1.PodSpec{
                        NodeName:      nodeName,
                        RestartPolicy: corev1.RestartPolicyOnFailure,
                        InitContainers: []corev1.Container{
                                {
                                        Name:  InterruptContainerName,
                                        Image: getAgentImage(opts, _package),
                                        Args:  []string{"interrupt", "/root", copyDir, argEncode},
                                        Env:   getAgentConfigEnvVars(opts, _package.Name, _package.Version, skyhook.ResourceID(), skyhook.Name),
                                        SecurityContext: &corev1.SecurityContext{
                                                Privileged: ptr(true),
                                        },
                                        VolumeMounts: volumeMounts,
                                        Resources: corev1.ResourceRequirements{
                                                Limits: corev1.ResourceList{
                                                        corev1.ResourceCPU:    resource.MustParse("500m"),
                                                        corev1.ResourceMemory: resource.MustParse("64Mi"),
                                                },
                                                Requests: corev1.ResourceList{
                                                        corev1.ResourceCPU:    resource.MustParse("500m"),
                                                        corev1.ResourceMemory: resource.MustParse("64Mi"),
                                                },
                                        },
                                },
                        },
                        Containers: []corev1.Container{
                                {
                                        Name:  "pause",
                                        Image: opts.PauseImage,
                                        Resources: corev1.ResourceRequirements{
                                                Limits: corev1.ResourceList{
                                                        corev1.ResourceCPU:    resource.MustParse("100m"),
                                                        corev1.ResourceMemory: resource.MustParse("20Mi"),
                                                },
                                                Requests: corev1.ResourceList{
                                                        corev1.ResourceCPU:    resource.MustParse("100m"),
                                                        corev1.ResourceMemory: resource.MustParse("20Mi"),
                                                },
                                        },
                                },
                        },
                        ImagePullSecrets: []corev1.LocalObjectReference{
                                {
                                        Name: opts.ImagePullSecret,
                                },
                        },
                        HostPID:     true,
                        HostNetwork: true,
                        // If you change these go change the SelectNode toleration in cluster_state.go
                        Tolerations: append([]corev1.Toleration{ // tolerate all cordon
                                {
                                        Key:      TaintUnschedulable,
                                        Operator: corev1.TolerationOpExists,
                                },
                                opts.GetRuntimeRequiredToleration(),
                        }, skyhook.Spec.AdditionalTolerations...),
                        Volumes: volumes,
                },
        }
        return pod
}

func trunstr(str string, length int) string {
        if len(str) > length {
                return str[:length]
        }
        return str
}

func getAgentImage(opts SkyhookOperatorOptions, _package *v1alpha1.Package) string {
        if _package.AgentImageOverride != "" {
                return _package.AgentImageOverride
        }
        return opts.AgentImage
}

// getPackageImage returns the full image reference for a package, using the digest if specified
func getPackageImage(_package *v1alpha1.Package) string {
        if _package.ContainerSHA != "" {
                // When containerSHA is specified, use it instead of the version tag for immutable image reference
                return fmt.Sprintf("%s@%s", _package.Image, _package.ContainerSHA)
        }
        // Fall back to version tag
        return fmt.Sprintf("%s:%s", _package.Image, _package.Version)
}

func getAgentConfigEnvVars(opts SkyhookOperatorOptions, packageName string, packageVersion string, resourceID string, skyhookName string) []corev1.EnvVar {
        return []corev1.EnvVar{
                {
                        Name:  "SKYHOOK_LOG_DIR",
                        Value: fmt.Sprintf("%s/%s", opts.AgentLogRoot, skyhookName),
                },
                {
                        Name:  "SKYHOOK_ROOT_DIR",
                        Value: fmt.Sprintf("%s/%s", opts.CopyDirRoot, skyhookName),
                },
                {
                        Name:  "COPY_RESOLV",
                        Value: "false",
                },
                {
                        Name:  "SKYHOOK_RESOURCE_ID",
                        Value: fmt.Sprintf("%s_%s_%s", resourceID, packageName, packageVersion),
                },
        }
}

// createPodFromPackage creates a pod spec for a skyhook pod for a given package
func createPodFromPackage(opts SkyhookOperatorOptions, _package *v1alpha1.Package, skyhook *wrapper.Skyhook, nodeName string, stage v1alpha1.Stage) *corev1.Pod {
        // Generate consistent names that won't exceed k8s limits
        volumeName := generateSafeName(63, "metadata", nodeName)
        configMapName := generateSafeName(253, skyhook.Name, nodeName, "metadata")

        volumes := []corev1.Volume{
                {
                        Name: "root-mount",
                        VolumeSource: corev1.VolumeSource{
                                HostPath: &corev1.HostPathVolumeSource{
                                        Path: "/",
                                },
                        },
                },
                {
                        Name: volumeName,
                        VolumeSource: corev1.VolumeSource{
                                ConfigMap: &corev1.ConfigMapVolumeSource{
                                        LocalObjectReference: corev1.LocalObjectReference{
                                                Name: configMapName,
                                        },
                                },
                        },
                },
        }

        volumeMounts := []corev1.VolumeMount{
                {
                        Name:             "root-mount",
                        MountPath:        "/root",
                        MountPropagation: ptr(corev1.MountPropagationHostToContainer),
                },
                {
                        Name:      volumeName,
                        MountPath: "/skyhook-package/node-metadata",
                },
        }

        if len(_package.ConfigMap) > 0 {
                volumeMounts = append(volumeMounts, corev1.VolumeMount{
                        Name:      _package.Name,
                        MountPath: "/skyhook-package/configmaps",
                })

                volumes = append(volumes, corev1.Volume{
                        Name: _package.Name,
                        VolumeSource: corev1.VolumeSource{
                                ConfigMap: &corev1.ConfigMapVolumeSource{
                                        LocalObjectReference: corev1.LocalObjectReference{
                                                Name: strings.ToLower(fmt.Sprintf("%s-%s-%s", skyhook.Name, _package.Name, _package.Version)),
                                        },
                                },
                        },
                })
        }

        copyDir := fmt.Sprintf("%s/%s/%s-%s-%s-%d",
                opts.CopyDirRoot,
                skyhook.Name,
                _package.Name,
                _package.Version,
                skyhook.UID,
                skyhook.Generation,
        )
        applyargs := []string{strings.ToLower(string(stage)), "/root", copyDir}
        checkargs := []string{strings.ToLower(string(stage) + "-check"), "/root", copyDir}

        agentEnvs := append(
                _package.Env,
                getAgentConfigEnvVars(opts, _package.Name, _package.Version, skyhook.ResourceID(), skyhook.Name)...,
        )

        pod := &corev1.Pod{
                ObjectMeta: metav1.ObjectMeta{
                        Name:      generateSafeName(63, skyhook.Name, _package.Name, _package.Version, string(stage), nodeName),
                        Namespace: opts.Namespace,
                        Labels: map[string]string{
                                fmt.Sprintf("%s/name", v1alpha1.METADATA_PREFIX):    skyhook.Name,
                                fmt.Sprintf("%s/package", v1alpha1.METADATA_PREFIX): fmt.Sprintf("%s-%s", _package.Name, _package.Version),
                        },
                },
                Spec: corev1.PodSpec{
                        NodeName:      nodeName,
                        RestartPolicy: corev1.RestartPolicyOnFailure,
                        InitContainers: []corev1.Container{
                                {
                                        Name:            fmt.Sprintf("%s-init", trunstr(_package.Name, 43)),
                                        Image:           getPackageImage(_package),
                                        ImagePullPolicy: "Always",
                                        Command:         []string{"/bin/sh"},
                                        Args: []string{
                                                "-c",
                                                "mkdir -p /root/${SKYHOOK_DIR} && cp -r /skyhook-package/* /root/${SKYHOOK_DIR}",
                                        },
                                        Env: []corev1.EnvVar{
                                                {
                                                        Name:  "SKYHOOK_DIR",
                                                        Value: copyDir,
                                                },
                                        },
                                        SecurityContext: &corev1.SecurityContext{
                                                Privileged: ptr(true),
                                        },
                                        VolumeMounts: volumeMounts,
                                },
                                {
                                        Name:            fmt.Sprintf("%s-%s", trunstr(_package.Name, 43), stage),
                                        Image:           getAgentImage(opts, _package),
                                        ImagePullPolicy: "Always",
                                        Args:            applyargs,
                                        Env:             agentEnvs,
                                        SecurityContext: &corev1.SecurityContext{
                                                Privileged: ptr(true),
                                        },
                                        VolumeMounts: volumeMounts,
                                },
                                {
                                        Name:            fmt.Sprintf("%s-%scheck", trunstr(_package.Name, 43), stage),
                                        Image:           getAgentImage(opts, _package),
                                        ImagePullPolicy: "Always",
                                        Args:            checkargs,
                                        Env:             agentEnvs,
                                        SecurityContext: &corev1.SecurityContext{
                                                Privileged: ptr(true),
                                        },
                                        VolumeMounts: volumeMounts,
                                },
                        },
                        Containers: []corev1.Container{
                                {
                                        Name:  "pause",
                                        Image: opts.PauseImage,
                                        Resources: corev1.ResourceRequirements{
                                                Limits: corev1.ResourceList{
                                                        corev1.ResourceCPU:    resource.MustParse("100m"),
                                                        corev1.ResourceMemory: resource.MustParse("20Mi"),
                                                },
                                                Requests: corev1.ResourceList{
                                                        corev1.ResourceCPU:    resource.MustParse("100m"),
                                                        corev1.ResourceMemory: resource.MustParse("20Mi"),
                                                },
                                        },
                                },
                        },
                        ImagePullSecrets: []corev1.LocalObjectReference{
                                {
                                        Name: opts.ImagePullSecret,
                                },
                        },
                        Volumes:     volumes,
                        HostPID:     true,
                        HostNetwork: true,
                        // If you change these go change the SelectNode toleration in cluster_state.go
                        Tolerations: append([]corev1.Toleration{ // tolerate all cordon
                                {
                                        Key:      TaintUnschedulable,
                                        Operator: corev1.TolerationOpExists,
                                },
                                opts.GetRuntimeRequiredToleration(),
                        }, skyhook.Spec.AdditionalTolerations...),
                },
        }
        if _package.GracefulShutdown != nil {
                pod.Spec.TerminationGracePeriodSeconds = ptr(int64(_package.GracefulShutdown.Duration.Seconds()))
        }
        setPodResources(pod, _package.Resources)
        return pod
}

// FilterEnv removes the environment variables passed into exlude
func FilterEnv(envs []corev1.EnvVar, exclude ...string) []corev1.EnvVar {
        var filteredEnv []corev1.EnvVar

        // build map of exclude strings for faster lookup
        excludeMap := make(map[string]struct{})
        for _, name := range exclude {
                excludeMap[name] = struct{}{}
        }

        // If the environment variable name is in the exclude list, skip it
        // otherwise append it to the final list
        for _, env := range envs {
                if _, found := excludeMap[env.Name]; !found {
                        filteredEnv = append(filteredEnv, env)
                }
        }

        return filteredEnv
}

// PodMatchesPackage asserts that a given pod matches the given pod spec
func podMatchesPackage(opts SkyhookOperatorOptions, _package *v1alpha1.Package, pod corev1.Pod, skyhook *wrapper.Skyhook, stage v1alpha1.Stage) bool {
        var expectedPod *corev1.Pod

        // need to differentiate whether the pod is for an interrupt or not so we know
        // what to expect and how to compare them
        isInterrupt := false
        _, limitRange := pod.Annotations["kubernetes.io/limit-ranger"]

        if pod.Labels[fmt.Sprintf("%s/interrupt", v1alpha1.METADATA_PREFIX)] == "True" {
                expectedPod = createInterruptPodForPackage(opts, &v1alpha1.Interrupt{}, "", _package, skyhook, "")
                isInterrupt = true
        } else {
                expectedPod = createPodFromPackage(opts, _package, skyhook, "", stage)
        }

        actualPod := pod.DeepCopy()

        // check to see whether the name or the version of the package changed
        packageLabel := fmt.Sprintf("%s/package", v1alpha1.METADATA_PREFIX)
        if actualPod.Labels[packageLabel] != expectedPod.Labels[packageLabel] {
                return false
        }

        // compare initContainers since this is where a lot of the important info lives
        for i := range actualPod.Spec.InitContainers {
                expectedContainer := expectedPod.Spec.InitContainers[i]
                actualContainer := actualPod.Spec.InitContainers[i]

                if expectedContainer.Name != actualContainer.Name {
                        return false
                }

                if expectedContainer.Image != actualContainer.Image {
                        return false
                }

                // compare the containers env vars except for the ones that are inserted
                // by the operator by default as the SKYHOOK_RESOURCE_ID will change every
                // time the skyhook is updated and would cause every pod to be removed
                // TODO: This is ignoring all the static env vars that are set by operator config.
                // It probably should be just SKYHOOK_RESOURCE_ID that is ignored. Otherwise,
                // a user will have to manually delete the pod to update the package when operator is updated.
                dummyAgentEnv := getAgentConfigEnvVars(opts, "", "", "", "")
                excludedEnvs := make([]string, len(dummyAgentEnv))
                for i, env := range dummyAgentEnv {
                        excludedEnvs[i] = env.Name
                }
                expectedFilteredEnv := FilterEnv(expectedContainer.Env, excludedEnvs...)
                actualFilteredEnv := FilterEnv(actualContainer.Env, excludedEnvs...)
                if !reflect.DeepEqual(expectedFilteredEnv, actualFilteredEnv) {
                        return false
                }

                if !isInterrupt { // dont compare these since they are not configured on interrupt
                        // compare resource requests and limits (CPU, memory, etc.)
                        expectedResources := expectedContainer.Resources
                        actualResources := actualContainer.Resources
                        if skyhook.Spec.Packages[_package.Name].Resources != nil {
                                // If CR has resources specified, they should match exactly
                                if !reflect.DeepEqual(expectedResources, actualResources) {
                                        return false
                                }
                        } else {
                                // If CR has no resources specified, ensure pod has no resource overrides
                                if !limitRange {
                                        if actualResources.Requests != nil || actualResources.Limits != nil {
                                                return false
                                        }
                                }
                        }
                }
        }

        return true
}

// ValidateRunningPackages deletes pods that don't match the current spec and checks if there are pods running
// that don't match the node state and removes them if they exist
func (r *SkyhookReconciler) ValidateRunningPackages(ctx context.Context, skyhook SkyhookNodes) (bool, error) {

        update := false
        errs := make([]error, 0)
        // get all pods for this skyhook packages
        pods, err := r.dal.GetPods(ctx,
                client.MatchingLabels{
                        fmt.Sprintf("%s/name", v1alpha1.METADATA_PREFIX): skyhook.GetSkyhook().Name,
                },
        )
        if err != nil {
                return false, fmt.Errorf("error getting pods while validating packages: %w", err)
        }
        if pods == nil || len(pods.Items) == 0 {
                return false, nil // nothing running for this skyhook on this node
        }

        // Initialize metrics for each stage
        stages := make(map[string]map[string]map[v1alpha1.Stage]int)

        // group pods by node
        podsbyNode := make(map[string][]corev1.Pod)
        for _, pod := range pods.Items {
                podsbyNode[pod.Spec.NodeName] = append(podsbyNode[pod.Spec.NodeName], pod)
        }

        for _, node := range skyhook.GetNodes() {
                nodeState, err := node.State()
                if err != nil {
                        return false, fmt.Errorf("error getting node state: %w", err)
                }

                for _, pod := range podsbyNode[node.GetNode().Name] {
                        found := false

                        runningPackage, err := GetPackage(&pod)
                        if err != nil {
                                errs = append(errs, fmt.Errorf("error getting package from pod [%s:%s] while validating packages: %w", pod.Namespace, pod.Name, err))
                        }

                        // check if the package is part of the skyhook spec, if not we need to delete it
                        for _, v := range skyhook.GetSkyhook().Spec.Packages {
                                if podMatchesPackage(r.opts, &v, pod, skyhook.GetSkyhook(), runningPackage.Stage) {
                                        found = true
                                }
                        }

                        // Increment the stage count for metrics
                        if _, ok := stages[runningPackage.Name]; !ok {
                                stages[runningPackage.Name] = make(map[string]map[v1alpha1.Stage]int)
                                if _, ok := stages[runningPackage.Name][runningPackage.Version]; !ok {
                                        stages[runningPackage.Name][runningPackage.Version] = make(map[v1alpha1.Stage]int)
                                        for _, stage := range v1alpha1.Stages {
                                                stages[runningPackage.Name][runningPackage.Version][stage] = 0
                                        }
                                }
                        }
                        stages[runningPackage.Name][runningPackage.Version][runningPackage.Stage]++

                        // uninstall is by definition not part of the skyhook spec, so we cant delete it (because it used to be but was removed, hence uninstalling it)
                        if runningPackage.Stage == v1alpha1.StageUninstall {
                                found = true
                        }

                        if !found {
                                update = true

                                err := r.InvalidPackage(ctx, &pod)
                                if err != nil {
                                        errs = append(errs, fmt.Errorf("error invalidating package: %w", err))
                                }
                                continue
                        }

                        // Check if package exists in node state, ie a package running that the node state doesn't know about
                        // something that is often done to try to fix bad node state is to clear the node state completely
                        // which if a package is running, we want to terminate it gracefully. Ofthen what leads to this is
                        // the package is in a crashloop and the operator want to restart it the whole package.
                        // when we apply a package it just check if there is a running package on the node for the state of the package
                        // this can cause to leave a pod running in say config mode, and it there is a depends on you might not correctly
                        // run thins in the correct order.
                        deleteMe := false
                        packageStatus, exists := nodeState[runningPackage.GetUniqueName()]
                        if !exists { // package not in node state, so we need to delete it
                                deleteMe = true
                        } else { // package in node state, so we need to check if it's running
                                // need check if the stats match, if not we need to delete it
                                if packageStatus.Stage != runningPackage.Stage {
                                        deleteMe = true
                                }
                        }

                        if deleteMe {
                                update = true
                                err := r.InvalidPackage(ctx, &pod)
                                if err != nil {
                                        errs = append(errs, fmt.Errorf("error invalidating package: %w", err))
                                }
                        }
                }
        }

        return update, utilerrors.NewAggregate(errs)
}

// InvalidPackage invalidates a package and updates the pod, which will trigger the pod to be deleted
func (r *SkyhookReconciler) InvalidPackage(ctx context.Context, pod *corev1.Pod) error {
        err := InvalidatePackage(pod)
        if err != nil {
                return fmt.Errorf("error invalidating package: %w", err)
        }

        err = r.Update(ctx, pod)
        if err != nil {
                return fmt.Errorf("error updating pod: %w", err)
        }

        return nil
}

// ProcessInterrupt will check and do the interrupt if need, and returns
// false means we are waiting
// true means we are good to proceed
func (r *SkyhookReconciler) ProcessInterrupt(ctx context.Context, skyhookNode wrapper.SkyhookNode, _package *v1alpha1.Package, interrupt *v1alpha1.Interrupt, runInterrupt bool) (bool, error) {

        if !skyhookNode.HasInterrupt(*_package) {
                return true, nil
        }

        // default starting stage
        stage := v1alpha1.StageApply
        nextStage := skyhookNode.NextStage(_package)
        if nextStage != nil {
                stage = *nextStage
        }

        // wait tell this is done if its happening
        status, found := skyhookNode.PackageStatus(_package.GetUniqueName())
        if found && status.State == v1alpha1.StateSkipped {
                return false, nil
        }

        // Theres is a race condition when a node reboots and api cleans up the interrupt pod
        // so we need to check if the pod exists and if it does, we need to recreate it
        if status != nil && (status.State == v1alpha1.StateInProgress || status.State == v1alpha1.StateErroring) && status.Stage == v1alpha1.StageInterrupt {
                // call interrupt to recreate the pod if missing
                err := r.Interrupt(ctx, skyhookNode, _package, interrupt)
                if err != nil {
                        return false, err
                }
        }

        // drain and cordon node before applying package that has an interrupt
        if stage == v1alpha1.StageApply {
                ready, err := r.EnsureNodeIsReadyForInterrupt(ctx, skyhookNode, _package)
                if err != nil {
                        return false, err
                }

                if !ready {
                        return false, nil
                }
        }

        // time to interrupt (once other packages have finished)
        if stage == v1alpha1.StageInterrupt && runInterrupt {
                err := r.Interrupt(ctx, skyhookNode, _package, interrupt)
                if err != nil {
                        return false, err
                }

                return false, nil
        }

        //skipping
        if stage == v1alpha1.StageInterrupt && !runInterrupt {
                err := skyhookNode.Upsert(_package.PackageRef, _package.Image, v1alpha1.StateSkipped, stage, 0, _package.ContainerSHA)
                if err != nil {
                        return false, fmt.Errorf("error upserting to skip interrupt: %w", err)
                }
                return false, nil
        }

        // wait tell this is done if its happening
        if status != nil && status.Stage == v1alpha1.StageInterrupt && status.State != v1alpha1.StateComplete {
                return false, nil
        }

        return true, nil
}

func (r *SkyhookReconciler) EnsureNodeIsReadyForInterrupt(ctx context.Context, skyhookNode wrapper.SkyhookNode, _package *v1alpha1.Package) (bool, error) {
        // cordon node
        skyhookNode.Cordon()

        hasWork, err := r.HasNonInterruptWork(ctx, skyhookNode)
        if err != nil {
                return false, err
        }
        if hasWork { // keep waiting...
                return false, nil
        }

        ready, err := r.DrainNode(ctx, skyhookNode, _package)
        if err != nil {
                return false, fmt.Errorf("error draining node [%s]: %w", skyhookNode.GetNode().Name, err)
        }

        return ready, nil
}

// ApplyPackage starts a pod on node for the package
func (r *SkyhookReconciler) ApplyPackage(ctx context.Context, logger logr.Logger, clusterState *clusterState, skyhookNode wrapper.SkyhookNode, _package *v1alpha1.Package, runInterrupt bool) error {

        if _package == nil {
                return errors.New("can not apply nil package")
        }

        // default starting stage
        stage := v1alpha1.StageApply

        // These modes don't have anything that comes before them so we must specify them as the
        // starting point. The next stage function will return nil until these modes complete.
        // Config is a special case as sometimes apply will come before it and other times it wont
        // which is why it needs to be here as well
        if packageStatus, found := skyhookNode.PackageStatus(_package.GetUniqueName()); found {
                switch packageStatus.Stage {
                case v1alpha1.StageConfig, v1alpha1.StageUpgrade, v1alpha1.StageUninstall:
                        stage = packageStatus.Stage
                }
        }

        // if stage != v1alpha1.StageApply {
        //         // If a node gets rest by a user, the about method will return the wrong node state. Above sources it from the skyhook status.
        //         // check if the node has nothing, reset it then apply the package.
        //         nodeState, err := skyhookNode.State()
        //         if err != nil {
        //                 return fmt.Errorf("error getting node state: %w", err)
        //         }

        //         _, found := nodeState[_package.GetUniqueName()]
        //         if !found {
        //                 stage = v1alpha1.StageApply
        //         }
        // }

        nextStage := skyhookNode.NextStage(_package)
        if nextStage != nil {
                stage = *nextStage
        }

        // test if pod exists, if so, bailout
        exists, err := r.PodExists(ctx, skyhookNode.GetNode().Name, skyhookNode.GetSkyhook().Name, _package)
        if err != nil {
                return err
        }

        // wait tell this is done if its happening
        status, found := skyhookNode.PackageStatus(_package.GetUniqueName())

        if found && status.State == v1alpha1.StateSkipped { // skipped, so nothing to do
                return nil
        }

        if found && status.State == v1alpha1.StateInProgress { // running, so do nothing atm
                if exists {
                        return nil
                }
        }

        if exists {
                // nothing to do here, already running
                return nil
        }

        pod := createPodFromPackage(r.opts, _package, skyhookNode.GetSkyhook(), skyhookNode.GetNode().Name, stage)

        if err := SetPackages(pod, skyhookNode.GetSkyhook().Skyhook, _package.Image, stage, _package); err != nil {
                return fmt.Errorf("error setting package on pod: %w", err)
        }

        // setup ownership of the pod we created
        // helps run time know what to do when something happens to this pod we are about to create
        if err := ctrl.SetControllerReference(skyhookNode.GetSkyhook().Skyhook, pod, r.scheme); err != nil {
                return fmt.Errorf("error setting ownership: %w", err)
        }

        if err := r.Create(ctx, pod); err != nil {
                return fmt.Errorf("error creating pod: %w", err)
        }

        if err = skyhookNode.Upsert(_package.PackageRef, _package.Image, v1alpha1.StateInProgress, stage, 0, _package.ContainerSHA); err != nil {
                err = fmt.Errorf("error upserting package: %w", err) // want to keep going in this case, but don't want to lose the err
        }

        skyhookNode.SetStatus(v1alpha1.StatusInProgress)

        skyhookNode.GetSkyhook().AddCondition(metav1.Condition{
                Type:               fmt.Sprintf("%s/ApplyPackage", v1alpha1.METADATA_PREFIX),
                Status:             metav1.ConditionTrue,
                ObservedGeneration: skyhookNode.GetSkyhook().Generation,
                LastTransitionTime: metav1.Now(),
                Reason:             "ApplyPackage",
                Message:            fmt.Sprintf("Applying package [%s:%s] to node [%s]", _package.Name, _package.Version, skyhookNode.GetNode().Name),
        })

        r.recorder.Eventf(skyhookNode.GetNode(), EventTypeNormal, EventsReasonSkyhookApply, "Applying package [%s:%s] from [skyhook:%s] stage [%s]", _package.Name, _package.Version, skyhookNode.GetSkyhook().Name, stage)
        r.recorder.Eventf(skyhookNode.GetSkyhook(), EventTypeNormal, EventsReasonSkyhookApply, "Applying package [%s:%s] to node [%s] stage [%s]", _package.Name, _package.Version, skyhookNode.GetNode().Name, stage)

        skyhookNode.GetSkyhook().Updated = true

        return err
}

// HandleRuntimeRequired finds any nodes for which all runtime required Skyhooks are complete and remove their runtime required taint
// Will return an error if the patching of the nodes is not possible
func (r *SkyhookReconciler) HandleRuntimeRequired(ctx context.Context, clusterState *clusterState) error {
        node_to_skyhooks, skyhook_node_map := groupSkyhooksByNode(clusterState)
        to_remove := getRuntimeRequiredTaintCompleteNodes(node_to_skyhooks, skyhook_node_map)
        // Remove the runtime required taint from nodes in to_remove
        taint_to_remove := r.opts.GetRuntimeRequiredTaint()
        errs := make([]error, 0)
        for _, node := range to_remove {
                // check before removing taint that it even exists to begin with
                if !taints.TaintExists(node.Spec.Taints, &taint_to_remove) {
                        continue
                }
                // RemoveTaint will ALWAYS return nil for its error so no need to check it
                new_node, updated, _ := taints.RemoveTaint(node, &taint_to_remove)
                if updated {
                        err := r.Patch(ctx, new_node, client.MergeFrom(node))
                        if err != nil {
                                errs = append(errs, err)
                        }
                }
        }
        if len(errs) > 0 {
                return utilerrors.NewAggregate(errs)
        }
        return nil
}

// Group Skyhooks by what node they target
func groupSkyhooksByNode(clusterState *clusterState) (map[types.UID][]SkyhookNodes, map[types.UID]*corev1.Node) {
        node_to_skyhooks := make(map[types.UID][]SkyhookNodes)
        nodes := make(map[types.UID]*corev1.Node)
        for _, skyhook := range clusterState.skyhooks {
                // Ignore skyhooks that don't have runtime required
                if !skyhook.GetSkyhook().Spec.RuntimeRequired {
                        continue
                }
                for _, node := range skyhook.GetNodes() {
                        if _, ok := node_to_skyhooks[node.GetNode().UID]; !ok {
                                node_to_skyhooks[node.GetNode().UID] = make([]SkyhookNodes, 0)
                                nodes[node.GetNode().UID] = node.GetNode()
                        }
                        node_to_skyhooks[node.GetNode().UID] = append(node_to_skyhooks[node.GetNode().UID], skyhook)
                }

        }
        return node_to_skyhooks, nodes
}

// Get the nodes to remove runtime required taint from node that all skyhooks targeting that node have completed
func getRuntimeRequiredTaintCompleteNodes(node_to_skyhooks map[types.UID][]SkyhookNodes, nodes map[types.UID]*corev1.Node) []*corev1.Node {
        to_remove := make([]*corev1.Node, 0)
        for node_uid, skyhooks := range node_to_skyhooks {
                all_complete := true
                for _, skyhook := range skyhooks {
                        if !skyhook.IsComplete() {
                                all_complete = false
                                break
                        }
                }
                if all_complete {
                        to_remove = append(to_remove, nodes[node_uid])
                }
        }
        return to_remove
}

// setPodResources sets resources for all containers and init containers in the pod if override is set, else leaves empty for LimitRange
func setPodResources(pod *corev1.Pod, res *v1alpha1.ResourceRequirements) {
        if res == nil {
                return
        }
        if !res.CPURequest.IsZero() || !res.CPULimit.IsZero() || !res.MemoryRequest.IsZero() || !res.MemoryLimit.IsZero() {
                for i := range pod.Spec.InitContainers {
                        pod.Spec.InitContainers[i].Resources = corev1.ResourceRequirements{
                                Limits: corev1.ResourceList{
                                        corev1.ResourceCPU:    res.CPULimit,
                                        corev1.ResourceMemory: res.MemoryLimit,
                                },
                                Requests: corev1.ResourceList{
                                        corev1.ResourceCPU:    res.CPURequest,
                                        corev1.ResourceMemory: res.MemoryRequest,
                                },
                        }
                }
        }
}

// PartitionNodesIntoCompartments partitions nodes for each skyhook that uses deployment policies.
func partitionNodesIntoCompartments(clusterState *clusterState) error {
        for _, skyhook := range clusterState.skyhooks {
                // Skip skyhooks without a deployment policy (they use the default compartment created in BuildState)
                if skyhook.GetSkyhook().Spec.DeploymentPolicy == "" {
                        continue
                }

                // Skip if no compartments exist (e.g., deployment policy not found)
                // The webhook should prevent this at admission time, and the controller sets a condition at runtime,
                // but we guard here to prevent panics if the policy goes missing
                if len(skyhook.GetCompartments()) == 0 {
                        continue
                }

                // Clear all compartments before reassigning nodes to prevent stale nodes
                // This ensures nodes are only in their current compartment based on current labels
                for _, compartment := range skyhook.GetCompartments() {
                        compartment.ClearNodes()
                }

                for _, node := range skyhook.GetNodes() {
                        compartmentName, err := skyhook.AssignNodeToCompartment(node)
                        if err != nil {
                                return fmt.Errorf("error assigning node %s: %w", node.GetNode().Name, err)
                        }
                        if err := skyhook.AddCompartmentNode(compartmentName, node); err != nil {
                                return fmt.Errorf("error adding node %s to compartment %s: %w", node.GetNode().Name, compartmentName, err)
                        }
                }
        }

        return nil
}

// validateAndUpsertSkyhookData performs validation and configmap operations for a skyhook
func (r *SkyhookReconciler) validateAndUpsertSkyhookData(ctx context.Context, skyhook SkyhookNodes, clusterState *clusterState) (bool, ctrl.Result, error) {
        if yes, result, err := shouldReturn(r.ValidateRunningPackages(ctx, skyhook)); yes {
                return yes, result, err
        }

        if yes, result, err := shouldReturn(r.ValidateNodeConfigmaps(ctx, skyhook.GetSkyhook().Name, skyhook.GetNodes())); yes {
                return yes, result, err
        }

        if yes, result, err := shouldReturn(r.UpsertConfigmaps(ctx, skyhook, clusterState)); yes {
                return yes, result, err
        }

        return false, ctrl.Result{}, nil
}

NVIDIA / skyhook / 20494412809

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