pixiecore/cli: implement logging controls.

The v1compat CLI is now complete, with support for --debug. The v2 CLI
additionally supports optional timestamping, so that when you're using
a modern init system that captures logs for you (e.g. systemd), you
don't have stuttering timestamps.

pixiecore/cli/apicmd.go

@@ -41,6 +41,15 @@ the Pixiecore boot API. The specification can be found at <TODO>.`,
 		if err != nil {
 			fatalf("Error reading flag: %s", err)
 		}
+		debug, err := cmd.Flags().GetBool("debug")
+		if err != nil {
+			fatalf("Error reading flag: %s", err)
+		}
+		timestamps, err := cmd.Flags().GetBool("log-timestamps")
+		if err != nil {
+			fatalf("Error reading flag: %s", err)
+		}
+
 		booter, err := pixiecore.APIBooter(server, timeout)
 		if err != nil {
 			fatalf("Failed to create API booter: %s", err)
@@ -48,9 +57,15 @@ the Pixiecore boot API. The specification can be found at <TODO>.`,
 		s := &pixiecore.Server{
 			Booter: booter,
 			Ipxe:   Ipxe,
-			Log:    logStdout,
+			Log:    logWithStdFmt,
-			Debug:  debugLog,
 		}
+		if timestamps {
+			s.Log = logWithStdLog
+		}
+		if debug {
+			s.Debug = s.Log
+		}
+
 		fmt.Println(s.Serve())
 	}}
 

pixiecore/cli/bootcmd.go

@@ -38,6 +38,14 @@ var bootCmd = &cobra.Command{
 		if err != nil {
 			fatalf("Error reading flag: %s", err)
 		}
+		debug, err := cmd.Flags().GetBool("debug")
+		if err != nil {
+			fatalf("Error reading flag: %s", err)
+		}
+		timestamps, err := cmd.Flags().GetBool("log-timestamps")
+		if err != nil {
+			fatalf("Error reading flag: %s", err)
+		}
 
 		spec := &pixiecore.Spec{
 			Kernel:  pixiecore.ID(kernel),
@@ -56,9 +64,15 @@ var bootCmd = &cobra.Command{
 		s := &pixiecore.Server{
 			Booter: booter,
 			Ipxe:   Ipxe,
-			Log:    logStdout,
+			Log:    logWithStdFmt,
-			Debug:  debugLog,
 		}
+		if timestamps {
+			s.Log = logWithStdLog
+		}
+		if debug {
+			s.Debug = s.Log
+		}
+
 		fmt.Println(s.Serve())
 	},
 }

pixiecore/cli/cli.go

@@ -84,23 +84,13 @@ func (ipxeFirmwareFlag) Type() string {
 	return "filename"
 }
 
-var cfgFile string
-
 func init() {
 	cobra.OnInitialize(initConfig)
-	rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file")
+	rootCmd.PersistentFlags().BoolP("debug", "d", false, "Log more things that aren't directly related to booting a recognized client")
+	rootCmd.PersistentFlags().BoolP("log-timestamps", "t", false, "Add a timestamp to each log line")
 }
 
 func initConfig() {
-	if cfgFile != "" { // enable ability to specify config file via flag
-		viper.SetConfigFile(cfgFile)
-		if err := viper.ReadInConfig(); err != nil {
-			fmt.Printf("Error reading configuration file %q: %s\n", viper.ConfigFileUsed(), err)
-			os.Exit(1)
-		}
-		fmt.Println("Using config file:", viper.ConfigFileUsed())
-	}
-
 	viper.SetEnvPrefix("pixiecore")
 	viper.AutomaticEnv() // read in environment variables that match
 }

pixiecore/cli/logging.go

@@ -16,17 +16,20 @@ package cli
 
 import (
 	"fmt"
+	"log"
 	"sync"
 )
 
 var logSync sync.Mutex
 
-func logStdout(subsys, msg string) {
+func logWithStdLog(subsys, msg string) {
+	logSync.Lock()
+	defer logSync.Unlock()
+	log.Printf("[%s] %s", subsys, msg)
+}
+
+func logWithStdFmt(subsys, msg string) {
 	logSync.Lock()
 	defer logSync.Unlock()
 	fmt.Printf("[%s] %s\n", subsys, msg)
 }
-
-func debugLog(subsys, msg string) {
-	logStdout("DEBUG-"+subsys, msg)
-}

pixiecore/cli/v1compat.go

@@ -42,7 +42,7 @@ func v1compatCLI() bool {
 	initrdFile := fs.String("initrd", "", "Comma-separated list of initrds to pass to the kernel")
 	kernelCmdline := fs.String("cmdline", "", "Additional arguments for the kernel commandline")
 
-	//debug := fs.Bool("debug", false, "Log more things that aren't directly related to booting a recognized client")
+	debug := fs.Bool("debug", false, "Log more things that aren't directly related to booting a recognized client")
 
 	if err := fs.Parse(os.Args[1:]); err != nil {
 		// This error path includes passing -h or --help. We want the
@@ -81,14 +81,16 @@ func v1compatCLI() bool {
 		s := &pixiecore.Server{
 			Booter:   booter,
 			Ipxe:     Ipxe,
-			Log:      logStdout,
+			Log:      logWithStdLog,
-			Debug:    debugLog,
 			Address:  *listenAddr,
 			HTTPPort: *portHTTP,
 			DHCPPort: *portDHCP,
 			TFTPPort: *portTFTP,
 			PXEPort:  *portPXE,
 		}
+		if *debug {
+			s.Debug = logWithStdLog
+		}
 		fmt.Println(s.Serve())
 
 	case *kernelFile != "":
@@ -117,14 +119,16 @@ func v1compatCLI() bool {
 		s := &pixiecore.Server{
 			Booter:   booter,
 			Ipxe:     Ipxe,
-			Log:      logStdout,
+			Log:      logWithStdLog,
-			Debug:    debugLog,
 			Address:  *listenAddr,
 			HTTPPort: *portHTTP,
 			DHCPPort: *portDHCP,
 			TFTPPort: *portTFTP,
 			PXEPort:  *portPXE,
 		}
+		if *debug {
+			s.Debug = logWithStdLog
+		}
 		fmt.Println(s.Serve())
 
 	default: