Add flag that prints timestamps in skaffold logs. (#5181)

* Add a flag that prints timestamps in skaffold logs.

* Add flag definition.

* Run ./hack/generate-man.sh

* gofmt cmd/skaffold/app/cmd/cmd.go

Author: jtzwu

cmd/skaffold/app/cmd/cmd.go

@@ -45,6 +45,7 @@ var (
 	forceColors       bool
 	overwrite         bool
 	interactive       bool
+	timestamps        bool
 	shutdownAPIServer func() error
 )
 
@@ -76,7 +77,7 @@ func NewSkaffoldCommand(out, err io.Writer) *cobra.Command {
 			cmd.Root().SetOutput(out)
 
 			// Setup logs
-			if err := setUpLogs(err, v); err != nil {
+			if err := setUpLogs(err, v, timestamps); err != nil {
 				return err
 			}
 
@@ -182,6 +183,7 @@ func NewSkaffoldCommand(out, err io.Writer) *cobra.Command {
 	rootCmd.PersistentFlags().BoolVar(&forceColors, "force-colors", false, "Always print color codes (hidden)")
 	rootCmd.PersistentFlags().BoolVar(&interactive, "interactive", true, "Allow user prompts for more information")
 	rootCmd.PersistentFlags().BoolVar(&update.EnableCheck, "update-check", true, "Check for a more recent version of Skaffold")
+	rootCmd.PersistentFlags().BoolVar(&timestamps, "timestamps", false, "Print timestamps in logs.")
 	rootCmd.PersistentFlags().MarkHidden("force-colors")
 
 	setFlagsFromEnvVariables(rootCmd)
@@ -231,13 +233,16 @@ func FlagToEnvVarName(f *pflag.Flag) string {
 	return fmt.Sprintf("SKAFFOLD_%s", strings.Replace(strings.ToUpper(f.Name), "-", "_", -1))
 }
 
-func setUpLogs(stdErr io.Writer, level string) error {
+func setUpLogs(stdErr io.Writer, level string, timestamp bool) error {
 	logrus.SetOutput(stdErr)
 	lvl, err := logrus.ParseLevel(level)
 	if err != nil {
 		return fmt.Errorf("parsing log level: %w", err)
 	}
 	logrus.SetLevel(lvl)
+	logrus.SetFormatter(&logrus.TextFormatter{
+		FullTimestamp: timestamp,
+	})
 	return nil
 }
 

docs/content/en/docs/references/cli/_index.md

@@ -100,6 +100,7 @@ Env vars:
 
 * `SKAFFOLD_COLOR` (same as `--color`)
 * `SKAFFOLD_INTERACTIVE` (same as `--interactive`)
+* `SKAFFOLD_TIMESTAMPS` (same as `--timestamps`)
 * `SKAFFOLD_UPDATE_CHECK` (same as `--update-check`)
 * `SKAFFOLD_VERBOSITY` (same as `--verbosity`)
 
@@ -747,6 +748,7 @@ The following options can be passed to any command:
 
       --color=34: Specify the default output color in ANSI escape codes
       --interactive=true: Allow user prompts for more information
+      --timestamps=false: Print timestamps in logs.
       --update-check=true: Check for a more recent version of Skaffold
   -v, --verbosity='warning': Log level (debug, info, warn, error, fatal, panic)