feat: Add --scopes/-S flag to specify additional ns to find relations…

…hips

Signed-off-by: Justin Toh <tohjustin@hotmail.com>

pkg/cmd/lineage/flags.go

@@ -7,11 +7,14 @@ import (
 const (
 	flagAllNamespaces          = "all-namespaces"
 	flagAllNamespacesShorthand = "A"
+	flagScopes                 = "scopes"
+	flagScopesShorthand        = "S"
 )
 
 // Flags composes common configuration flag structs used in the command.
 type Flags struct {
 	AllNamespaces *bool
+	Scopes        *[]string
 }
 
 // Copy returns a copy of Flags for mutation.
@@ -26,14 +29,19 @@ func (f *Flags) AddFlags(flags *pflag.FlagSet) {
 	if f.AllNamespaces != nil {
 		flags.BoolVarP(f.AllNamespaces, flagAllNamespaces, flagAllNamespacesShorthand, *f.AllNamespaces, "If present, list object relationships across all namespaces.")
 	}
+	if f.Scopes != nil {
+		flags.StringSliceVarP(f.Scopes, flagScopes, flagScopesShorthand, *f.Scopes, "Accepts a comma separated list of additional namespaces to find relationships. You can also use multiple flag options like -S namespace1 -S namespace2...")
+	}
 }
 
 // NewConfigFlags returns flags associated with command configuration,
 // with default values set.
 func NewFlags() *Flags {
 	allNamespaces := false
+	scopes := []string{}
 
 	return &Flags{
 		AllNamespaces: &allNamespaces,
+		Scopes:        &scopes,
 	}
 }

pkg/cmd/lineage/lineage.go

@@ -172,6 +172,7 @@ func (o *CmdOptions) Validate() error {
 	klog.V(4).Infof("Namespace: %s", o.Namespace)
 	klog.V(4).Infof("RequestObject: %v", o.RequestObject)
 	klog.V(4).Infof("Flags.AllNamespaces: %t", *o.Flags.AllNamespaces)
+	klog.V(4).Infof("Flags.Scopes: %v", *o.Flags.Scopes)
 	klog.V(4).Infof("ClientFlags.Context: %s", *o.ClientFlags.Context)
 	klog.V(4).Infof("ClientFlags.Namespace: %s", *o.ClientFlags.Namespace)
 	klog.V(4).Infof("PrintFlags.OutputFormat: %s", *o.PrintFlags.OutputFormat)
@@ -200,6 +201,9 @@ func (o *CmdOptions) Run() error {
 	if o.Flags.AllNamespaces != nil && *o.Flags.AllNamespaces {
 		namespaces = append(namespaces, "")
 	}
+	if o.Flags.Scopes != nil {
+		namespaces = append(namespaces, *o.Flags.Scopes...)
+	}
 
 	// Fetch all resources in the cluster
 	objects, err := o.KubeClient.List(ctx, client.ListOptions{Namespaces: namespaces})