args: Honor config-dir & quiet wherever they are (#3356)

setGlobalsFromContext() is added to set global variables after parsing
command line arguments. Thus, global flags will be honored wherever
they are placed in minio command.

cmd/globals.go

@@ -22,6 +22,8 @@ import (
 
 	humanize "github.com/dustin/go-humanize"
 	"github.com/fatih/color"
+	"github.com/minio/cli"
+	"github.com/minio/mc/pkg/console"
 	"github.com/minio/minio/pkg/objcache"
 )
 
@@ -53,11 +55,12 @@ const (
 )
 
 var (
-	globalQuiet    = false // Quiet flag set via command line.
-	globalIsDistXL = false // "Is Distributed?" flag.
-
+	globalQuiet     = false               // quiet flag set via command line.
+	globalConfigDir = mustGetConfigPath() // config-dir flag set via command line
 	// Add new global flags here.
 
+	globalIsDistXL = false // "Is Distributed?" flag.
+
 	// Maximum cache size.
 	globalMaxCacheSize = uint64(maxCacheSize)
 	// Cache expiry.
@@ -90,3 +93,19 @@ var (
 	colorBlue  = color.New(color.FgBlue).SprintfFunc()
 	colorGreen = color.New(color.FgGreen).SprintfFunc()
 )
+
+// Parse command arguments and set global variables accordingly
+func setGlobalsFromContext(c *cli.Context) {
+	// Set config dir
+	switch {
+	case c.IsSet("config-dir"):
+		globalConfigDir = c.String("config-dir")
+	case c.GlobalIsSet("config-dir"):
+		globalConfigDir = c.GlobalString("config-dir")
+	}
+	if globalConfigDir == "" {
+		console.Fatalf("Unable to get config file. Config directory is empty.")
+	}
+	// Set global quiet flag.
+	globalQuiet = c.Bool("quiet") || c.GlobalBool("quiet")
+}

cmd/main.go

@@ -17,7 +17,6 @@
 package cmd
 
 import (
-	"errors"
 	"fmt"
 	"os"
 	"sort"
@@ -148,19 +147,26 @@ func checkMainSyntax(c *cli.Context) {
 	}
 }
 
-// Main main for minio server.
-func Main() {
-	app := registerApp()
-	app.Before = func(c *cli.Context) error {
-		configDir := c.GlobalString("config-dir")
-		if configDir == "" {
-			fatalIf(errors.New("Config directory is empty"), "Unable to get config file.")
+// Check for updates and print a notification message
+func checkUpdate() {
+	// Do not print update messages, if quiet flag is set.
+	if !globalQuiet {
+		updateMsg, _, err := getReleaseUpdate(minioUpdateStableURL, 1*time.Second)
+		if err != nil {
+			// Ignore any errors during getReleaseUpdate(), possibly
+			// because of network errors.
+			return
 		}
-		// Sets new config directory.
-		setGlobalConfigPath(configDir)
+		if updateMsg.Update {
+			console.Println(updateMsg)
+		}
+	}
+}
 
-		// Valid input arguments to main.
-		checkMainSyntax(c)
+// Generic Minio initialization to create/load config, prepare loggers, etc..
+func minioInit() {
+	// Sets new config directory.
+	setGlobalConfigPath(globalConfigDir)
 
 	// Migrate any old version of config / state files to newer format.
 	migrate()
@@ -197,23 +203,14 @@ func Main() {
 	// Init the error tracing module.
 	initError()
 
-		// Set global quiet flag.
-		globalQuiet = c.Bool("quiet") || c.GlobalBool("quiet")
+}
 
-		// Do not print update messages, if quiet flag is set.
-		if !globalQuiet {
-			if c.Args().Get(0) != "update" {
-				updateMsg, _, err := getReleaseUpdate(minioUpdateStableURL, 1*time.Second)
-				if err != nil {
-					// Ignore any errors during getReleaseUpdate(), possibly
-					// because of network errors.
-					return nil
-				}
-				if updateMsg.Update {
-					console.Println(updateMsg)
-				}
-			}
-		}
+// Main main for minio server.
+func Main() {
+	app := registerApp()
+	app.Before = func(c *cli.Context) error {
+		// Valid input arguments to main.
+		checkMainSyntax(c)
 		return nil
 	}
 

cmd/server-main.go

@@ -363,8 +363,13 @@ func serverMain(c *cli.Context) {
 		cli.ShowCommandHelpAndExit(c, "server", 1)
 	}
 
-	// Set global quiet flag.
-	globalQuiet = c.Bool("quiet") || c.GlobalBool("quiet")
+	// Set global variables after parsing passed arguments
+	setGlobalsFromContext(c)
+
+	// Initialization routine, such as config loading, enable logging, ..
+	minioInit()
+
+	checkUpdate()
 
 	// Server address.
 	serverAddr := c.String("address")

cmd/update-main.go

@@ -265,8 +265,14 @@ func getReleaseUpdate(updateURL string, duration time.Duration) (updateMsg updat
 
 // main entry point for update command.
 func mainUpdate(ctx *cli.Context) {
-	// Set global quiet flag.
-	if ctx.Bool("quiet") || ctx.GlobalBool("quiet") {
+
+	// Set global variables after parsing passed arguments
+	setGlobalsFromContext(ctx)
+
+	// Initialization routine, such as config loading, enable logging, ..
+	minioInit()
+
+	if globalQuiet {
 		return
 	}
 

cmd/version-main.go

@@ -43,8 +43,14 @@ func mainVersion(ctx *cli.Context) {
 	if len(ctx.Args()) != 0 {
 		cli.ShowCommandHelpAndExit(ctx, "version", 1)
 	}
-	// Set global quiet flag.
-	if ctx.Bool("quiet") || ctx.GlobalBool("quiet") {
+
+	// Set global variables after parsing passed arguments
+	setGlobalsFromContext(ctx)
+
+	// Initialization routine, such as config loading, enable logging, ..
+	minioInit()
+
+	if globalQuiet {
 		return
 	}