Add flag to skip checking resource when fully deleting app

pkg/kapp/app/interfaces.go

@@ -24,7 +24,7 @@ type App interface {
 
 	CreateOrUpdate(map[string]string, bool) error
 	Exists() (bool, string, error)
-	Delete() error
+	Delete(checkResource bool) error
 	Rename(string, string) error
 	RenamePrevApp(string, map[string]string, bool) error
 

pkg/kapp/app/labeled_app.go

@@ -47,7 +47,7 @@ func (a *LabeledApp) UpdateUsedGVsAndGKs([]schema.GroupVersion, []schema.GroupKi
 func (a *LabeledApp) CreateOrUpdate(labels map[string]string, isDiffRun bool) error { return nil }
 func (a *LabeledApp) Exists() (bool, string, error)                                 { return true, "", nil }
 
-func (a *LabeledApp) Delete() error {
+func (a *LabeledApp) Delete(checkResource bool) error {
 	labelSelector, err := a.LabelSelector()
 	if err != nil {
 		return err
@@ -59,11 +59,13 @@ func (a *LabeledApp) Delete() error {
 	}
 
 	if len(rs) > 0 {
-		var resourceNames []string
-		for _, res := range rs {
-			resourceNames = append(resourceNames, res.Description())
+		if checkResource {
+			var resourceNames []string
+			for _, res := range rs {
+				resourceNames = append(resourceNames, res.Description())
+			}
+			return fmt.Errorf("Expected all resources to be gone, but found: %s", strings.Join(resourceNames, ", "))
 		}
-		return fmt.Errorf("Expected all resources to be gone, but found: %s", strings.Join(resourceNames, ", "))
 	}
 
 	return nil

pkg/kapp/app/recorded_app.go

@@ -353,7 +353,7 @@ func (a *RecordedApp) Exists() (bool, string, error) {
 	return true, "", nil
 }
 
-func (a *RecordedApp) Delete() error {
+func (a *RecordedApp) Delete(checkResource bool) error {
 	app, err := a.labeledApp()
 	if err != nil {
 		return err
@@ -364,7 +364,7 @@ func (a *RecordedApp) Delete() error {
 		return fmt.Errorf("Deleting app changes: %w", err)
 	}
 
-	err = app.Delete()
+	err = app.Delete(checkResource)
 	if err != nil {
 		return err
 	}

pkg/kapp/cmd/app/delete.go

@@ -29,6 +29,7 @@ type DeleteOptions struct {
 	ApplyFlags          ApplyFlags
 	ResourceTypesFlags  ResourceTypesFlags
 	PrevAppFlags        PrevAppFlags
+	DeleteFlags         DeleteFlags
 }
 
 type changesSummary struct {
@@ -56,6 +57,7 @@ func NewDeleteCmd(o *DeleteOptions, flagsFactory cmdcore.FlagsFactory) *cobra.Co
 	o.ApplyFlags.SetWithDefaults("", ApplyFlagsDeleteDefaults, cmd)
 	o.ResourceTypesFlags.Set(cmd)
 	o.PrevAppFlags.Set(cmd)
+	o.DeleteFlags.Set(cmd)
 	return cmd
 }
 
@@ -157,7 +159,7 @@ func (o *DeleteOptions) Run() error {
 			return err
 		}
 		if shouldFullyDeleteApp {
-			return app.Delete()
+			return app.Delete(o.DeleteFlags.DisableCheckingResourceDeletion)
 		}
 		return nil
 	})

pkg/kapp/cmd/app/delete_flags.go

@@ -0,0 +1,15 @@
+// Copyright 2020 VMware, Inc.
+// SPDX-License-Identifier: Apache-2.0
+
+package app
+
+import "github.com/spf13/cobra"
+
+type DeleteFlags struct {
+	DisableCheckingResourceDeletion bool
+}
+
+func (s *DeleteFlags) Set(cmd *cobra.Command) {
+	cmd.Flags().BoolVar(&s.DisableCheckingResourceDeletion, "dangerous-disable-checking-resource-deletion",
+		false, "Skip checking resource deletion when fully deleting app")
+}