Implement global verbose flag to set logger verbosity

and if plugin root command already implement a verbose flag pass the flag value down to plugin

Author: mpanchajanya

docs/plugindev/style_guide.md

@@ -208,9 +208,6 @@ Available input components:
 
 ### Feedback principles
 
-Useful for everyone, critical to the usability of screen-readers and automation
-Support verbosity flags (`-v`, `--verbose`).
-
 `--format` to define preferred output
 
 * Useful for humans and machine users, ie table, value, json, csv, yaml, etc

pkg/command/root.go

@@ -33,6 +33,9 @@ import (
 	"github.com/vmware-tanzu/tanzu-plugin-runtime/plugin"
 )
 
+// verbose flag to set the log level
+var verbose int
+
 // NewRootCmd creates a root command.
 func NewRootCmd() (*cobra.Command, error) { //nolint: gocyclo,funlen
 	var rootCmd = newRootCmd()
@@ -42,6 +45,9 @@ func NewRootCmd() (*cobra.Command, error) { //nolint: gocyclo,funlen
 	// Configure defined environment variables found in the config file
 	cliconfig.ConfigureEnvVariables()
 
+	// Initialize the global verbose flag to set the log level verbosity (acceptable values 1 - 9)
+	rootCmd.PersistentFlags().IntVar(&verbose, "verbose", 0, "number for the log level verbosity(acceptable values 1 - 9)")
+
 	rootCmd.AddCommand(
 		newVersionCmd(),
 		newPluginCmd(),
@@ -58,6 +64,7 @@ func NewRootCmd() (*cobra.Command, error) { //nolint: gocyclo,funlen
 		newCEIPParticipationCmd(),
 		newGenAllDocsCmd(),
 	)
+
 	if _, err := ensureCLIInstanceID(); err != nil {
 		return nil, errors.Wrap(err, "failed to ensure CLI ID")
 	}
@@ -240,8 +247,74 @@ func newRootCmd() *cobra.Command {
 		// silencing usage for now as we are getting double usage from plugins on errors
 		SilenceUsage: true,
 		PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
-			// Sets the verbosity of the logger if TANZU_CLI_LOG_LEVEL is set
-			setLoggerVerbosity()
+
+			fmt.Println(args, "args", verbose)
+
+			// Validate the verbose flag
+			if verbose < 0 {
+				log.Errorf("Invalid value for verbose flag. It should be 0 or greater")
+				os.Exit(1)
+			}
+
+			// For CLI commands: Default the verbose value to -1 If the flag is not set by user
+			// For Plugin commands: This won't be executed since flags are not parsed by cli but send to plugin as args
+			if !cmd.Flags().Changed("verbose") {
+				verbose = -1
+			}
+
+			/**
+			Manually parse the flags when plugin command is triggered
+			1. For CLI commands; all flags have been parsed and removed from the list of args and this loop will not run
+			2. For Plugin commands; Since CLI doesn't parse args and sends all args to plugin this loop will run to verify if verbose flag is set by the user and then passes to plugin.
+			*/
+			for i := 0; i < len(args); i++ {
+				arg := args[i]
+				if arg == "--verbose" {
+					if i+1 < len(args) {
+						nextArg := args[i+1]
+						// Check if the next argument is another flag
+						if strings.HasPrefix(nextArg, "-") {
+							log.Errorf("Missing value for verbose flag")
+							os.Exit(1)
+						}
+						// Try to convert the next argument to an integer
+						if v, err := strconv.Atoi(nextArg); err == nil {
+							verbose = v
+							// If it's not an integer, check if it's a boolean
+						} else if v, err := strconv.ParseBool(nextArg); err == nil {
+							// TODO: Determine what verbose value need to set when plugin verbose is boolean true or false
+							if v {
+								verbose = 3 // Default log level is 3
+							} else {
+								verbose = 0
+							}
+						} else {
+							log.Errorf("Invalid value for verbose flag: %v\n", err)
+							os.Exit(1)
+						}
+						// Skip the next argument
+						i++
+					} else {
+						log.Errorf("Missing value for verbose flag")
+						os.Exit(1)
+					}
+				}
+			}
+
+			// Sets the verbosity of the logger
+
+			log.Infof("verbose %v", verbose)
+			setLoggerVerbosity(verbose)
+
+			//TODO: Remove test logs
+			log.Info("I am level default")
+			log.V(0).Info("I am level 0")
+			log.V(1).Info("I am level 1")
+			log.V(2).Info("I am level 2")
+			log.V(3).Info("I am level 3")
+			log.V(4).Info("I am level 4")
+			log.V(5).Info("I am level 5")
+			log.V(6).Info("I am level 6")
 
 			// Ensure mutual exclusion in current contexts just in case if any plugins with old
 			// plugin-runtime sets k8s context as current when tanzu context is already set as current
@@ -291,13 +364,22 @@ func newRootCmd() *cobra.Command {
 }
 
 // setLoggerVerbosity sets the verbosity of the logger if TANZU_CLI_LOG_LEVEL is set
-func setLoggerVerbosity() {
-	// Configure the log level if env variable TANZU_CLI_LOG_LEVEL is set
-	logLevel := os.Getenv(log.EnvTanzuCLILogLevel)
-	if logLevel != "" {
-		logValue, err := strconv.ParseInt(logLevel, 10, 32)
-		if err == nil {
-			log.SetVerbosity(int32(logValue))
+func setLoggerVerbosity(verbosity int) {
+	// If verbose global flag is passed set the log level verbosity  if not then check if env variable TANZU_CLI_LOG_LEVEL is set
+	if verbosity >= 0 {
+		// Set the log level verbosity with the verbosity value
+		log.SetVerbosity(int32(verbosity))
+
+		// Set the TANZU_CLI_LOG_LEVEL env with the verbosity value
+		_ = os.Setenv(log.EnvTanzuCLILogLevel, strconv.Itoa(verbosity))
+	} else {
+		// Configure the log level if env variable TANZU_CLI_LOG_LEVEL is set
+		logLevel := os.Getenv(log.EnvTanzuCLILogLevel)
+		if logLevel != "" {
+			logValue, err := strconv.ParseInt(logLevel, 10, 32)
+			if err == nil {
+				log.SetVerbosity(int32(logValue))
+			}
 		}
 	}
 }