Prevent login spam on large clusters

Added conditional to project list that will suppress project
list output on login if the list is greater than 50.

Bug 1542326

pkg/oc/cli/cmd/login/loginoptions.go

@@ -34,6 +34,8 @@ import (
 
 const defaultClusterURL = "https://localhost:8443"
 
+const projectsItemsSurpressThreshold = 50 
+
 // LoginOptions is a helper for the login and setup process, gathers all information required for a
 // successful login and eventual update of config files.
 // Depending on the Reader present it can be interactive, asking for terminal input in
@@ -316,16 +318,21 @@ func (o *LoginOptions) gatherProjectInfo() error {
 			return err
 		}
 		o.Project = current.Name
-
-		fmt.Fprintf(o.Out, "You have access to the following projects and can switch between them with '%s project <projectname>':\n\n", o.CommandName)
-		for _, p := range projects.List() {
-			if o.Project == p {
-				fmt.Fprintf(o.Out, "  * %s\n", p)
-			} else {
-				fmt.Fprintf(o.Out, "    %s\n", p)
+
+		// Surpress project listing if the number of projects available to the user is greater than the threshold. Prevents unnecessarily noisy logins on clusters with large numbers of projects
+		if len(projectsItems) > projectsItemsSurpressThreshold {
+			fmt.Fprintf(o.Out, "You have access to %d projects, the list has been surpressed. You can list all projects with '%s projects'\n", len(projectsItems), o.CommandName)
+		} else {
+			fmt.Fprintf(o.Out, "You have access to the following projects and can switch between them with '%s project <projectname>':\n\n", o.CommandName)
+			for _, p := range projects.List() {
+				if o.Project == p {
+					fmt.Fprintf(o.Out, "  * %s\n", p)
+				} else {
+					fmt.Fprintf(o.Out, "    %s\n", p)
+				}
 			}
+			fmt.Fprintln(o.Out)
 		}
-		fmt.Fprintln(o.Out)
 		fmt.Fprintf(o.Out, "Using project %q.\n", o.Project)
 	}