Extend further validation of config values (#8469)

- This PR allows config KVS to be validated properly
  without being affected by ENV overrides, rejects
  invalid values during set operation

- Expands unit tests and refactors the error handling
  for notification targets, returns error instead of
  ignoring targets for invalid KVS

- Does all the prep-work for implementing safe-mode
  style operation for MinIO server, introduces a new
  global variable to toggle safe mode based operations
  NOTE: this PR itself doesn't provide safe mode operations

cmd/admin-handlers-config-kv.go

@@ -19,6 +19,7 @@ package cmd
 import (
 	"bufio"
 	"bytes"
+	"context"
 	"encoding/json"
 	"io"
 	"net/http"
@@ -29,11 +30,29 @@ import (
 	"github.com/minio/minio/pkg/madmin"
 )
 
+func validateAdminReqConfigKV(ctx context.Context, w http.ResponseWriter, r *http.Request) ObjectLayer {
+	// Get current object layer instance.
+	objectAPI := globalObjectAPI
+	if objectAPI == nil {
+		writeErrorResponseJSON(ctx, w, errorCodes.ToAPIErr(ErrServerNotInitialized), r.URL)
+		return nil
+	}
+
+	// Validate request signature.
+	adminAPIErr := checkAdminRequestAuthType(ctx, r, "")
+	if adminAPIErr != ErrNone {
+		writeErrorResponseJSON(ctx, w, errorCodes.ToAPIErr(adminAPIErr), r.URL)
+		return nil
+	}
+
+	return objectAPI
+}
+
 // DelConfigKVHandler - DELETE /minio/admin/v2/del-config-kv
 func (a adminAPIHandlers) DelConfigKVHandler(w http.ResponseWriter, r *http.Request) {
 	ctx := newContext(r, w, "DelConfigKVHandler")
 
-	objectAPI := validateAdminReq(ctx, w, r)
+	objectAPI := validateAdminReqConfigKV(ctx, w, r)
 	if objectAPI == nil {
 		return
 	}
@@ -66,6 +85,7 @@ func (a adminAPIHandlers) DelConfigKVHandler(w http.ResponseWriter, r *http.Requ
 	oldCfg := cfg.Clone()
 	scanner := bufio.NewScanner(bytes.NewReader(kvBytes))
 	for scanner.Scan() {
+		// Skip any empty lines
 		if scanner.Text() == "" {
 			continue
 		}
@@ -89,7 +109,7 @@ func (a adminAPIHandlers) DelConfigKVHandler(w http.ResponseWriter, r *http.Requ
 func (a adminAPIHandlers) SetConfigKVHandler(w http.ResponseWriter, r *http.Request) {
 	ctx := newContext(r, w, "SetConfigKVHandler")
 
-	objectAPI := validateAdminReq(ctx, w, r)
+	objectAPI := validateAdminReqConfigKV(ctx, w, r)
 	if objectAPI == nil {
 		return
 	}
@@ -123,6 +143,7 @@ func (a adminAPIHandlers) SetConfigKVHandler(w http.ResponseWriter, r *http.Requ
 	oldCfg := cfg.Clone()
 	scanner := bufio.NewScanner(bytes.NewReader(kvBytes))
 	for scanner.Scan() {
+		// Skip any empty lines
 		if scanner.Text() == "" {
 			continue
 		}
@@ -158,16 +179,22 @@ func (a adminAPIHandlers) SetConfigKVHandler(w http.ResponseWriter, r *http.Requ
 func (a adminAPIHandlers) GetConfigKVHandler(w http.ResponseWriter, r *http.Request) {
 	ctx := newContext(r, w, "GetConfigKVHandler")
 
-	objectAPI := validateAdminReq(ctx, w, r)
+	objectAPI := validateAdminReqConfigKV(ctx, w, r)
 	if objectAPI == nil {
 		return
 	}
 
+	cfg, err := getValidConfig(objectAPI)
+	if err != nil {
+		writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, err), r.URL)
+		return
+	}
+
 	vars := mux.Vars(r)
 	var buf = &bytes.Buffer{}
 	key := vars["key"]
 	if key != "" {
-		kvs, err := globalServerConfig.GetKVS(key)
+		kvs, err := cfg.GetKVS(key)
 		if err != nil {
 			writeErrorResponseJSON(ctx, w, toAdminAPIErr(ctx, err), r.URL)
 			return
@@ -181,7 +208,7 @@ func (a adminAPIHandlers) GetConfigKVHandler(w http.ResponseWriter, r *http.Requ
 			}
 		}
 	} else {
-		buf.WriteString(globalServerConfig.String())
+		buf.WriteString(cfg.String())
 	}
 
 	password := globalActiveCred.SecretKey
@@ -197,7 +224,7 @@ func (a adminAPIHandlers) GetConfigKVHandler(w http.ResponseWriter, r *http.Requ
 func (a adminAPIHandlers) ClearConfigHistoryKVHandler(w http.ResponseWriter, r *http.Request) {
 	ctx := newContext(r, w, "ClearConfigHistoryKVHandler")
 
-	objectAPI := validateAdminReq(ctx, w, r)
+	objectAPI := validateAdminReqConfigKV(ctx, w, r)
 	if objectAPI == nil {
 		return
 	}
@@ -232,7 +259,7 @@ func (a adminAPIHandlers) ClearConfigHistoryKVHandler(w http.ResponseWriter, r *
 func (a adminAPIHandlers) RestoreConfigHistoryKVHandler(w http.ResponseWriter, r *http.Request) {
 	ctx := newContext(r, w, "RestoreConfigHistoryKVHandler")
 
-	objectAPI := validateAdminReq(ctx, w, r)
+	objectAPI := validateAdminReqConfigKV(ctx, w, r)
 	if objectAPI == nil {
 		return
 	}
@@ -260,6 +287,7 @@ func (a adminAPIHandlers) RestoreConfigHistoryKVHandler(w http.ResponseWriter, r
 	oldCfg := cfg.Clone()
 	scanner := bufio.NewScanner(bytes.NewReader(kvBytes))
 	for scanner.Scan() {
+		// Skip any empty lines
 		if scanner.Text() == "" {
 			continue
 		}
@@ -290,7 +318,7 @@ func (a adminAPIHandlers) RestoreConfigHistoryKVHandler(w http.ResponseWriter, r
 func (a adminAPIHandlers) ListConfigHistoryKVHandler(w http.ResponseWriter, r *http.Request) {
 	ctx := newContext(r, w, "ListConfigHistoryKVHandler")
 
-	objectAPI := validateAdminReq(ctx, w, r)
+	objectAPI := validateAdminReqConfigKV(ctx, w, r)
 	if objectAPI == nil {
 		return
 	}
@@ -314,7 +342,7 @@ func (a adminAPIHandlers) ListConfigHistoryKVHandler(w http.ResponseWriter, r *h
 func (a adminAPIHandlers) HelpConfigKVHandler(w http.ResponseWriter, r *http.Request) {
 	ctx := newContext(r, w, "HelpConfigKVHandler")
 
-	objectAPI := validateAdminReq(ctx, w, r)
+	objectAPI := validateAdminReqConfigKV(ctx, w, r)
 	if objectAPI == nil {
 		return
 	}
@@ -340,7 +368,7 @@ func (a adminAPIHandlers) HelpConfigKVHandler(w http.ResponseWriter, r *http.Req
 func (a adminAPIHandlers) SetConfigHandler(w http.ResponseWriter, r *http.Request) {
 	ctx := newContext(r, w, "SetConfigHandler")
 
-	objectAPI := validateAdminReq(ctx, w, r)
+	objectAPI := validateAdminReqConfigKV(ctx, w, r)
 	if objectAPI == nil {
 		return
 	}
@@ -391,7 +419,7 @@ func (a adminAPIHandlers) SetConfigHandler(w http.ResponseWriter, r *http.Reques
 func (a adminAPIHandlers) GetConfigHandler(w http.ResponseWriter, r *http.Request) {
 	ctx := newContext(r, w, "GetConfigHandler")
 
-	objectAPI := validateAdminReq(ctx, w, r)
+	objectAPI := validateAdminReqConfigKV(ctx, w, r)
 	if objectAPI == nil {
 		return
 	}

cmd/admin-handlers.go

@@ -933,7 +933,7 @@ func (a adminAPIHandlers) BackgroundHealStatusHandler(w http.ResponseWriter, r *
 
 func validateAdminReq(ctx context.Context, w http.ResponseWriter, r *http.Request) ObjectLayer {
 	// Get current object layer instance.
-	objectAPI := newObjectLayerFn()
+	objectAPI := globalObjectAPI
 	if objectAPI == nil || globalNotificationSys == nil || globalIAMSys == nil {
 		writeErrorResponseJSON(ctx, w, errorCodes.ToAPIErr(ErrServerNotInitialized), r.URL)
 		return nil

cmd/admin-handlers_test.go

@@ -90,7 +90,11 @@ func prepareAdminXLTestBed() (*adminXLTestBed, error) {
 	globalPolicySys = NewPolicySys()
 	globalPolicySys.Init(buckets, objLayer)
 
-	globalNotificationSys = NewNotificationSys(globalServerConfig, globalEndpoints)
+	globalNotificationSys, err = NewNotificationSys(globalServerConfig, globalEndpoints)
+	if err != nil {
+		return nil, err
+	}
+
 	globalNotificationSys.Init(buckets, objLayer)
 
 	// Setup admin mgmt REST API handlers.

cmd/admin-heal-ops.go

@@ -660,7 +660,7 @@ func (h *healSequence) traverseAndHeal() {
 func (h *healSequence) healMinioSysMeta(metaPrefix string) func() error {
 	return func() error {
 		// Get current object layer instance.
-		objectAPI := newObjectLayerFn()
+		objectAPI := globalObjectAPI
 		if objectAPI == nil {
 			return errServerNotInitialized
 		}
@@ -692,7 +692,7 @@ func (h *healSequence) healDiskFormat() error {
 	}
 
 	// Get current object layer instance.
-	objectAPI := newObjectLayerFn()
+	objectAPI := globalObjectAPI
 	if objectAPI == nil {
 		return errServerNotInitialized
 	}
@@ -712,7 +712,7 @@ func (h *healSequence) healBuckets() error {
 	}
 
 	// Get current object layer instance.
-	objectAPI := newObjectLayerFn()
+	objectAPI := globalObjectAPI
 	if objectAPI == nil {
 		return errServerNotInitialized
 	}
@@ -734,7 +734,7 @@ func (h *healSequence) healBuckets() error {
 // healBucket - traverses and heals given bucket
 func (h *healSequence) healBucket(bucket string) error {
 	// Get current object layer instance.
-	objectAPI := newObjectLayerFn()
+	objectAPI := globalObjectAPI
 	if objectAPI == nil {
 		return errServerNotInitialized
 	}
@@ -771,7 +771,7 @@ func (h *healSequence) healObject(bucket, object string) error {
 	}
 
 	// Get current object layer instance.
-	objectAPI := newObjectLayerFn()
+	objectAPI := globalObjectAPI
 	if objectAPI == nil {
 		return errServerNotInitialized
 	}

cmd/api-router.go

@@ -37,8 +37,18 @@ type objectAPIHandlers struct {
 func registerAPIRouter(router *mux.Router, encryptionEnabled, allowSSEKMS bool) {
 	// Initialize API.
 	api := objectAPIHandlers{
-		ObjectAPI: newObjectLayerFn,
+		ObjectAPI: func() ObjectLayer {
-		CacheAPI:  newCacheObjectsFn,
+			if !globalSafeMode {
+				return globalObjectAPI
+			}
+			return nil
+		},
+		CacheAPI: func() CacheObjectLayer {
+			if !globalSafeMode {
+				return globalCacheObjectAPI
+			}
+			return nil
+		},
 		EncryptionEnabled: func() bool {
 			return encryptionEnabled
 		},

cmd/background-heal-ops.go

@@ -107,7 +107,7 @@ func startBackgroundHealing() {
 
 	var objAPI ObjectLayer
 	for {
-		objAPI = newObjectLayerFn()
+		objAPI = globalObjectAPI
 		if objAPI == nil {
 			time.Sleep(time.Second)
 			continue
@@ -135,7 +135,7 @@ func initBackgroundHealing() {
 // failure error occurred.
 func bgHealDiskFormat(ctx context.Context, opts madmin.HealOpts) (madmin.HealResultItem, error) {
 	// Get current object layer instance.
-	objectAPI := newObjectLayerFn()
+	objectAPI := globalObjectAPI
 	if objectAPI == nil {
 		return madmin.HealResultItem{}, errServerNotInitialized
 	}
@@ -165,7 +165,7 @@ func bgHealDiskFormat(ctx context.Context, opts madmin.HealOpts) (madmin.HealRes
 // bghealBucket - traverses and heals given bucket
 func bgHealBucket(ctx context.Context, bucket string, opts madmin.HealOpts) (madmin.HealResultItem, error) {
 	// Get current object layer instance.
-	objectAPI := newObjectLayerFn()
+	objectAPI := globalObjectAPI
 	if objectAPI == nil {
 		return madmin.HealResultItem{}, errServerNotInitialized
 	}
@@ -176,7 +176,7 @@ func bgHealBucket(ctx context.Context, bucket string, opts madmin.HealOpts) (mad
 // bgHealObject - heal the given object and record result
 func bgHealObject(ctx context.Context, bucket, object string, opts madmin.HealOpts) (madmin.HealResultItem, error) {
 	// Get current object layer instance.
-	objectAPI := newObjectLayerFn()
+	objectAPI := globalObjectAPI
 	if objectAPI == nil {
 		return madmin.HealResultItem{}, errServerNotInitialized
 	}

cmd/background-newdisks-heal-ops.go

@@ -36,7 +36,7 @@ func monitorLocalDisksAndHeal() {
 	// Wait until the object layer is ready
 	var objAPI ObjectLayer
 	for {
-		objAPI = newObjectLayerFn()
+		objAPI = globalObjectAPI
 		if objAPI == nil {
 			time.Sleep(time.Second)
 			continue

cmd/common-main.go

@@ -162,8 +162,9 @@ func handleCommonEnvVars() {
 		logger.Fatal(config.ErrInvalidBrowserValue(err), "Invalid MINIO_BROWSER value in environment variable")
 	}
 
-	for _, domainName := range strings.Split(env.Get(config.EnvDomain, ""), config.ValueSeparator) {
+	domains := env.Get(config.EnvDomain, "")
-		if domainName != "" {
+	if len(domains) != 0 {
+		for _, domainName := range strings.Split(domains, config.ValueSeparator) {
 			if _, ok := dns2.IsDomainName(domainName); !ok {
 				logger.Fatal(config.ErrInvalidDomainValue(nil).Msg("Unknown value `%s`", domainName),
 					"Invalid MINIO_DOMAIN value in environment variable")
@@ -172,9 +173,9 @@ func handleCommonEnvVars() {
 		}
 	}
 
-	minioEndpointsEnv, ok := env.Lookup(config.EnvPublicIPs)
+	publicIPs := env.Get(config.EnvPublicIPs, "")
-	if ok {
+	if len(publicIPs) != 0 {
-		minioEndpoints := strings.Split(minioEndpointsEnv, config.ValueSeparator)
+		minioEndpoints := strings.Split(publicIPs, config.ValueSeparator)
 		var domainIPs = set.NewStringSet()
 		for _, endpoint := range minioEndpoints {
 			if net.ParseIP(endpoint) == nil {

cmd/config-current.go

@@ -18,7 +18,6 @@ package cmd
 
 import (
 	"context"
-	"fmt"
 	"strings"
 	"sync"
 
@@ -46,6 +45,12 @@ var (
 )
 
 func validateConfig(s config.Config) error {
+	// Disable merging env values with config for validation.
+	env.SetEnvOff()
+
+	// Enable env values upon return.
+	defer env.SetEnvOn()
+
 	if _, err := config.LookupCreds(s[config.CredentialsSubSys][config.Default]); err != nil {
 		return err
 	}
@@ -91,25 +96,23 @@ func validateConfig(s config.Config) error {
 	return notify.TestNotificationTargets(s, GlobalServiceDoneCh, globalRootCAs)
 }
 
-func lookupConfigs(s config.Config) {
+func lookupConfigs(s config.Config) (err error) {
-	var err error
-
 	if !globalActiveCred.IsValid() {
 		// Env doesn't seem to be set, we fallback to lookup creds from the config.
 		globalActiveCred, err = config.LookupCreds(s[config.CredentialsSubSys][config.Default])
 		if err != nil {
-			logger.Fatal(err, "Invalid credentials configuration")
+			return config.Errorf("Invalid credentials configuration: %s", err)
 		}
 	}
 
 	etcdCfg, err := etcd.LookupConfig(s[config.EtcdSubSys][config.Default], globalRootCAs)
 	if err != nil {
-		logger.Fatal(err, "Unable to initialize etcd config")
+		return config.Errorf("Unable to initialize etcd config: %s", err)
 	}
 
 	globalEtcdClient, err = etcd.New(etcdCfg)
 	if err != nil {
-		logger.Fatal(err, "Unable to initialize etcd config")
+		return config.Errorf("Unable to initialize etcd config: %s", err)
 	}
 
 	if len(globalDomainNames) != 0 && !globalDomainIPs.IsEmpty() && globalEtcdClient != nil {
@@ -120,52 +123,51 @@ func lookupConfigs(s config.Config) {
 			dns.CoreDNSPath(etcdCfg.CoreDNSPath),
 		)
 		if err != nil {
-			logger.Fatal(err, "Unable to initialize DNS config for %s.", globalDomainNames)
+			return config.Errorf("Unable to initialize DNS config for %s: %s", globalDomainNames, err)
 		}
 	}
 
 	globalServerRegion, err = config.LookupRegion(s[config.RegionSubSys][config.Default])
 	if err != nil {
-		logger.Fatal(err, "Invalid region configuration")
+		return config.Errorf("Invalid region configuration: %s", err)
 	}
 
 	globalWORMEnabled, err = config.LookupWorm(s[config.WormSubSys][config.Default])
 	if err != nil {
-		logger.Fatal(config.ErrInvalidWormValue(err),
+		return config.Errorf("Invalid worm configuration: %s", err)
-			"Invalid worm configuration")
+
 	}
 
 	if globalIsXL {
 		globalStorageClass, err = storageclass.LookupConfig(s[config.StorageClassSubSys][config.Default],
 			globalXLSetDriveCount)
 		if err != nil {
-			logger.FatalIf(err, "Unable to initialize storage class config")
+			return config.Errorf("Unable to initialize storage class config: %s", err)
 		}
 	}
 
 	globalCacheConfig, err = cache.LookupConfig(s[config.CacheSubSys][config.Default])
 	if err != nil {
-		logger.FatalIf(err, "Unable to setup cache")
+		return config.Errorf("Unable to setup cache: %s", err)
 	}
 
 	if globalCacheConfig.Enabled {
 		if cacheEncKey := env.Get(cache.EnvCacheEncryptionMasterKey, ""); cacheEncKey != "" {
 			globalCacheKMS, err = crypto.ParseMasterKey(cacheEncKey)
 			if err != nil {
-				logger.FatalIf(config.ErrInvalidCacheEncryptionKey(err),
+				return config.Errorf("Unable to setup encryption cache: %s", err)
-					"Unable to setup encryption cache")
 			}
 		}
 	}
 
 	kmsCfg, err := crypto.LookupConfig(s[config.KmsVaultSubSys][config.Default])
 	if err != nil {
-		logger.FatalIf(err, "Unable to setup KMS config")
+		return config.Errorf("Unable to setup KMS config: %s", err)
 	}
 
 	GlobalKMS, err = crypto.NewKMS(kmsCfg)
 	if err != nil {
-		logger.FatalIf(err, "Unable to setup KMS with current KMS config")
+		return config.Errorf("Unable to setup KMS with current KMS config: %s", err)
 	}
 
 	// Enable auto-encryption if enabled
@@ -173,19 +175,19 @@ func lookupConfigs(s config.Config) {
 
 	globalCompressConfig, err = compress.LookupConfig(s[config.CompressionSubSys][config.Default])
 	if err != nil {
-		logger.FatalIf(err, "Unable to setup Compression")
+		return config.Errorf("Unable to setup Compression: %s", err)
 	}
 
 	globalOpenIDConfig, err = openid.LookupConfig(s[config.IdentityOpenIDSubSys][config.Default],
 		NewCustomHTTPTransport(), xhttp.DrainBody)
 	if err != nil {
-		logger.FatalIf(err, "Unable to initialize OpenID")
+		return config.Errorf("Unable to initialize OpenID: %s", err)
 	}
 
 	opaCfg, err := opa.LookupConfig(s[config.PolicyOPASubSys][config.Default],
 		NewCustomHTTPTransport(), xhttp.DrainBody)
 	if err != nil {
-		logger.FatalIf(err, "Unable to initialize OPA")
+		return config.Errorf("Unable to initialize OPA: %s", err)
 	}
 
 	globalOpenIDValidators = getOpenIDValidators(globalOpenIDConfig)
@@ -194,7 +196,7 @@ func lookupConfigs(s config.Config) {
 	globalLDAPConfig, err = xldap.Lookup(s[config.IdentityLDAPSubSys][config.Default],
 		globalRootCAs)
 	if err != nil {
-		logger.FatalIf(err, "Unable to parse LDAP configuration")
+		return config.Errorf("Unable to parse LDAP configuration: %s", err)
 	}
 
 	// Load logger targets based on user's configuration
@@ -202,7 +204,7 @@ func lookupConfigs(s config.Config) {
 
 	loggerCfg, err := logger.LookupConfig(s)
 	if err != nil {
-		logger.FatalIf(err, "Unable to initialize logger")
+		return config.Errorf("Unable to initialize logger: %s", err)
 	}
 
 	for _, l := range loggerCfg.HTTP {
@@ -221,6 +223,8 @@ func lookupConfigs(s config.Config) {
 
 	// Enable console logging
 	logger.AddTarget(globalConsoleSys.Console())
+
+	return nil
 }
 
 var helpMap = map[string]config.HelpKV{
@@ -255,18 +259,18 @@ func GetHelp(subSys, key string, envOnly bool) (config.HelpKV, error) {
 	}
 	subSystemValue := strings.SplitN(subSys, config.SubSystemSeparator, 2)
 	if len(subSystemValue) == 0 {
-		return nil, config.Error(fmt.Sprintf("invalid number of arguments %s", subSys))
+		return nil, config.Errorf("invalid number of arguments %s", subSys)
 	}
 
 	if !config.SubSystems.Contains(subSystemValue[0]) {
-		return nil, config.Error(fmt.Sprintf("unknown sub-system %s", subSys))
+		return nil, config.Errorf("unknown sub-system %s", subSys)
 	}
 
 	help := helpMap[subSystemValue[0]]
 	if key != "" {
 		value, ok := help[key]
 		if !ok {
-			return nil, config.Error(fmt.Sprintf("unknown key %s for sub-system %s", key, subSys))
+			return nil, config.Errorf("unknown key %s for sub-system %s", key, subSys)
 		}
 		help = config.HelpKV{
 			key: value,
@@ -341,7 +345,9 @@ func newSrvConfig(objAPI ObjectLayer) error {
 	srvCfg := newServerConfig()
 
 	// Override any values from ENVs.
-	lookupConfigs(srvCfg)
+	if err := lookupConfigs(srvCfg); err != nil {
+		return err
+	}
 
 	// hold the mutex lock before a new config is assigned.
 	globalServerConfigMu.Lock()
@@ -378,7 +384,9 @@ func loadConfig(objAPI ObjectLayer) error {
 	}
 
 	// Override any values from ENVs.
-	lookupConfigs(srvCfg)
+	if err = lookupConfigs(srvCfg); err != nil {
+		return err
+	}
 
 	// hold the mutex lock before a new config is assigned.
 	globalServerConfigMu.Lock()

cmd/config-migrate.go

@@ -445,7 +445,7 @@ func migrateV5ToV6() error {
 
 	if cv5.Logger.ElasticSearch.URL != "" {
 		var url *xnet.URL
-		url, err = xnet.ParseURL(cv5.Logger.ElasticSearch.URL)
+		url, err = xnet.ParseHTTPURL(cv5.Logger.ElasticSearch.URL)
 		if err != nil {
 			return err
 		}

cmd/config/cache/config.go

@@ -89,6 +89,9 @@ func parseCacheDrives(drives []string) ([]string, error) {
 	}
 
 	for _, d := range endpoints {
+		if len(d) == 0 {
+			return nil, config.ErrInvalidCacheDrivesValue(nil).Msg("cache dir cannot be an empty path")
+		}
 		if !filepath.IsAbs(d) {
 			return nil, config.ErrInvalidCacheDrivesValue(nil).Msg("cache dir should be absolute path: %s", d)
 		}

cmd/config/cache/config_test.go

@@ -30,11 +30,15 @@ func TestParseCacheDrives(t *testing.T) {
 		expectedPatterns []string
 		success          bool
 	}{
-		// valid input
+		// Invalid input
 
 		{"bucket1/*;*.png;images/trip/barcelona/*", []string{}, false},
 		{"bucket1", []string{}, false},
+		{";;;", []string{}, false},
+		{",;,;,;", []string{}, false},
 	}
+
+	// Valid inputs
 	if runtime.GOOS == "windows" {
 		testCases = append(testCases, struct {
 			driveStr         string
@@ -91,8 +95,12 @@ func TestParseCacheExclude(t *testing.T) {
 		expectedPatterns []string
 		success          bool
 	}{
-		// valid input
+		// Invalid input
 		{"/home/drive1;/home/drive2;/home/drive3", []string{}, false},
+		{"/", []string{}, false},
+		{";;;", []string{}, false},
+
+		// valid input
 		{"bucket1/*;*.png;images/trip/barcelona/*", []string{"bucket1/*", "*.png", "images/trip/barcelona/*"}, true},
 		{"bucket1", []string{"bucket1"}, true},
 	}

cmd/config/certs.go

@@ -119,8 +119,8 @@ func LoadX509KeyPair(certFile, keyFile string) (tls.Certificate, error) {
 		return tls.Certificate{}, ErrSSLUnexpectedData(nil).Msg("The private key contains additional data")
 	}
 	if x509.IsEncryptedPEMBlock(key) {
-		password, ok := env.Lookup(EnvCertPassword)
+		password := env.Get(EnvCertPassword, "")
-		if !ok {
+		if len(password) == 0 {
 			return tls.Certificate{}, ErrSSLNoPassword(nil)
 		}
 		decryptedKey, decErr := x509.DecryptPEMBlock(key, []byte(password))

cmd/config/compress/compress.go

@@ -56,11 +56,15 @@ var (
 )
 
 // Parses the given compression exclude list `extensions` or `content-types`.
-func parseCompressIncludes(includes []string) ([]string, error) {
+func parseCompressIncludes(include string) ([]string, error) {
+	includes := strings.Split(include, config.ValueSeparator)
 	for _, e := range includes {
 		if len(e) == 0 {
 			return nil, config.ErrInvalidCompressionIncludesValue(nil).Msg("extension/mime-type cannot be empty")
 		}
+		if e == "/" {
+			return nil, config.ErrInvalidCompressionIncludesValue(nil).Msg("extension/mime-type cannot be '/'")
+		}
 	}
 	return includes, nil
 }
@@ -90,22 +94,21 @@ func LookupConfig(kvs config.KVS) (Config, error) {
 	compressMimeTypesLegacy := env.Get(EnvCompressMimeTypesLegacy, kvs.Get(MimeTypes))
 	if compressExtensions != "" || compressMimeTypes != "" || compressMimeTypesLegacy != "" {
 		if compressExtensions != "" {
-			extensions, err := parseCompressIncludes(strings.Split(compressExtensions, config.ValueSeparator))
+			extensions, err := parseCompressIncludes(compressExtensions)
 			if err != nil {
 				return cfg, fmt.Errorf("%s: Invalid MINIO_COMPRESS_EXTENSIONS value (`%s`)", err, extensions)
 			}
 			cfg.Extensions = extensions
 		}
 		if compressMimeTypes != "" {
-			mimeTypes, err := parseCompressIncludes(strings.Split(compressMimeTypes, config.ValueSeparator))
+			mimeTypes, err := parseCompressIncludes(compressMimeTypes)
 			if err != nil {
 				return cfg, fmt.Errorf("%s: Invalid MINIO_COMPRESS_MIME_TYPES value (`%s`)", err, mimeTypes)
 			}
 			cfg.MimeTypes = mimeTypes
 		}
 		if compressMimeTypesLegacy != "" {
-			mimeTypes, err := parseCompressIncludes(strings.Split(compressMimeTypesLegacy,
+			mimeTypes, err := parseCompressIncludes(compressMimeTypesLegacy)
-				config.ValueSeparator))
 			if err != nil {
 				return cfg, fmt.Errorf("%s: Invalid MINIO_COMPRESS_MIME_TYPES value (`%s`)", err, mimeTypes)
 			}

cmd/config/compress/compress_test.go

@@ -0,0 +1,57 @@
+/*
+ * MinIO Cloud Storage, (C) 2019 MinIO, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package compress
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestParseCompressIncludes(t *testing.T) {
+	testCases := []struct {
+		str              string
+		expectedPatterns []string
+		success          bool
+	}{
+		// invalid input
+		{",,,", []string{}, false},
+		{"", []string{}, false},
+		{",", []string{}, false},
+		{"/", []string{}, false},
+		{"text/*,/", []string{}, false},
+
+		// valid input
+		{".txt,.log", []string{".txt", ".log"}, true},
+		{"text/*,application/json", []string{"text/*", "application/json"}, true},
+	}
+
+	for _, testCase := range testCases {
+		testCase := testCase
+		t.Run(testCase.str, func(t *testing.T) {
+			gotPatterns, err := parseCompressIncludes(testCase.str)
+			if !testCase.success && err == nil {
+				t.Error("expected failure but success instead")
+			}
+			if testCase.success && err != nil {
+				t.Errorf("expected success but failed instead %s", err)
+			}
+			if testCase.success && !reflect.DeepEqual(testCase.expectedPatterns, gotPatterns) {
+				t.Errorf("expected patterns %s but got %s", testCase.expectedPatterns, gotPatterns)
+			}
+		})
+	}
+}

cmd/config/config.go

@@ -29,6 +29,12 @@ import (
 // Error config error type
 type Error string
 
+// Errorf - formats according to a format specifier and returns
+// the string as a value that satisfies error of type config.Error
+func Errorf(format string, a ...interface{}) error {
+	return Error(fmt.Sprintf(format, a...))
+}
+
 func (e Error) Error() string {
 	return string(e)
 }
@@ -403,10 +409,6 @@ func (c Config) SetKVS(s string, defaultKVS map[string]KVS) error {
 			kvs[prevK] = strings.Join([]string{kvs[prevK], sanitizeValue(kv[0])}, KvSpaceSeparator)
 			continue
 		}
-		if len(kv[1]) == 0 {
-			err := fmt.Sprintf("value for key '%s' cannot be empty", kv[0])
-			return Error(err)
-		}
 		prevK = kv[0]
 		kvs[kv[0]] = sanitizeValue(kv[1])
 	}

cmd/config/etcd/etcd.go

@@ -19,6 +19,7 @@ package etcd
 import (
 	"crypto/tls"
 	"crypto/x509"
+	"fmt"
 	"strings"
 	"time"
 
@@ -75,6 +76,25 @@ func New(cfg Config) (*clientv3.Client, error) {
 	return clientv3.New(cfg.Config)
 }
 
+func parseEndpoints(endpoints string) ([]string, bool, error) {
+	etcdEndpoints := strings.Split(endpoints, config.ValueSeparator)
+
+	var etcdSecure bool
+	for _, endpoint := range etcdEndpoints {
+		u, err := xnet.ParseHTTPURL(endpoint)
+		if err != nil {
+			return nil, false, err
+		}
+		if etcdSecure && u.Scheme == "http" {
+			return nil, false, fmt.Errorf("all endpoints should be https or http: %s", endpoint)
+		}
+		// If one of the endpoint is https, we will use https directly.
+		etcdSecure = etcdSecure || u.Scheme == "https"
+	}
+
+	return etcdEndpoints, etcdSecure, nil
+}
+
 // LookupConfig - Initialize new etcd config.
 func LookupConfig(kv config.KVS, rootCAs *x509.CertPool) (Config, error) {
 	cfg := Config{}
@@ -96,22 +116,12 @@ func LookupConfig(kv config.KVS, rootCAs *x509.CertPool) (Config, error) {
 		return cfg, nil
 	}
 
-	cfg.Enabled = true
+	etcdEndpoints, etcdSecure, err := parseEndpoints(endpoints)
-	etcdEndpoints := strings.Split(endpoints, config.ValueSeparator)
+	if err != nil {
-
+		return cfg, err
-	var etcdSecure bool
-	for _, endpoint := range etcdEndpoints {
-		if endpoint == "" {
-			continue
-		}
-		u, err := xnet.ParseURL(endpoint)
-		if err != nil {
-			return cfg, err
-		}
-		// If one of the endpoint is https, we will use https directly.
-		etcdSecure = etcdSecure || u.Scheme == "https"
 	}
 
+	cfg.Enabled = true
 	cfg.DialTimeout = defaultDialTimeout
 	cfg.DialKeepAliveTime = defaultDialKeepAlive
 	cfg.Endpoints = etcdEndpoints

cmd/config/etcd/etcd_test.go

@@ -0,0 +1,66 @@
+/*
+ * MinIO Cloud Storage, (C) 2019 MinIO, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package etcd
+
+import (
+	"reflect"
+	"testing"
+)
+
+// TestParseEndpoints - tests parseEndpoints function with valid and invalid inputs.
+func TestParseEndpoints(t *testing.T) {
+	testCases := []struct {
+		s         string
+		endpoints []string
+		secure    bool
+		success   bool
+	}{
+		// Invalid inputs
+		{"https://localhost:2379,http://localhost:2380", nil, false, false},
+		{",,,", nil, false, false},
+		{"", nil, false, false},
+		{"ftp://localhost:2379", nil, false, false},
+		{"http://localhost:2379000", nil, false, false},
+
+		// Valid inputs
+		{"https://localhost:2379,https://localhost:2380", []string{
+			"https://localhost:2379", "https://localhost:2380"},
+			true, true},
+		{"http://localhost:2379", []string{"http://localhost:2379"}, false, true},
+	}
+
+	for _, testCase := range testCases {
+		testCase := testCase
+		t.Run(testCase.s, func(t *testing.T) {
+			endpoints, secure, err := parseEndpoints(testCase.s)
+			if err != nil && testCase.success {
+				t.Errorf("expected to succeed but failed with %s", err)
+			}
+			if !testCase.success && err == nil {
+				t.Error("expected failure but succeeded instead")
+			}
+			if testCase.success {
+				if !reflect.DeepEqual(endpoints, testCase.endpoints) {
+					t.Errorf("expected %s, got %s", testCase.endpoints, endpoints)
+				}
+				if secure != testCase.secure {
+					t.Errorf("expected %t, got %t", testCase.secure, secure)
+				}
+			}
+		})
+	}
+}

cmd/config/identity/openid/jwt.go

@@ -284,7 +284,7 @@ func LookupConfig(kv config.KVS, transport *http.Transport, closeRespFn func(io.
 
 	configURL := env.Get(EnvIdentityOpenIDURL, kv.Get(ConfigURL))
 	if configURL != "" {
-		c.URL, err = xnet.ParseURL(configURL)
+		c.URL, err = xnet.ParseHTTPURL(configURL)
 		if err != nil {
 			return c, err
 		}
@@ -315,7 +315,7 @@ func LookupConfig(kv config.KVS, transport *http.Transport, closeRespFn func(io.
 		closeRespFn: closeRespFn,
 	}
 
-	c.JWKS.URL, err = xnet.ParseURL(jwksURL)
+	c.JWKS.URL, err = xnet.ParseHTTPURL(jwksURL)
 	if err != nil {
 		return c, err
 	}

cmd/config/identity/openid/jwt_test.go

@@ -53,7 +53,7 @@ func TestJWT(t *testing.T) {
 		}
 	}
 
-	u1, err := xnet.ParseURL("http://localhost:8443")
+	u1, err := xnet.ParseHTTPURL("http://localhost:8443")
 	if err != nil {
 		t.Fatal(err)
 	}

cmd/config/identity/openid/validators_test.go

@@ -87,7 +87,7 @@ func TestValidators(t *testing.T) {
 		t.Fatalf("Unexpected number of vids %v", vids)
 	}
 
-	u, err := xnet.ParseURL(ts.URL)
+	u, err := xnet.ParseHTTPURL(ts.URL)
 	if err != nil {
 		t.Fatal(err)
 	}

cmd/config/notify/parse.go

@@ -17,7 +17,6 @@
 package notify
 
 import (
-	"context"
 	"crypto/tls"
 	"crypto/x509"
 	"strconv"
@@ -61,7 +60,57 @@ func RegisterNotificationTargets(cfg config.Config, doneCh <-chan struct{}, root
 		return nil, err
 	}
 
-	for id, args := range GetNotifyAMQP(cfg) {
+	amqpTargets, err := GetNotifyAMQP(cfg[config.NotifyAMQPSubSys])
+	if err != nil {
+		return nil, err
+	}
+
+	esTargets, err := GetNotifyES(cfg[config.NotifyESSubSys])
+	if err != nil {
+		return nil, err
+	}
+
+	kafkaTargets, err := GetNotifyKafka(cfg[config.NotifyKafkaSubSys])
+	if err != nil {
+		return nil, err
+	}
+
+	mqttTargets, err := GetNotifyMQTT(cfg[config.NotifyMQTTSubSys], rootCAs)
+	if err != nil {
+		return nil, err
+	}
+
+	mysqlTargets, err := GetNotifyMySQL(cfg[config.NotifyMySQLSubSys])
+	if err != nil {
+		return nil, err
+	}
+
+	natsTargets, err := GetNotifyNATS(cfg[config.NotifyNATSSubSys])
+	if err != nil {
+		return nil, err
+	}
+
+	nsqTargets, err := GetNotifyNSQ(cfg[config.NotifyNSQSubSys])
+	if err != nil {
+		return nil, err
+	}
+
+	postgresTargets, err := GetNotifyPostgres(cfg[config.NotifyPostgresSubSys])
+	if err != nil {
+		return nil, err
+	}
+
+	redisTargets, err := GetNotifyRedis(cfg[config.NotifyRedisSubSys])
+	if err != nil {
+		return nil, err
+	}
+
+	webhookTargets, err := GetNotifyWebhook(cfg[config.NotifyWebhookSubSys], rootCAs)
+	if err != nil {
+		return nil, err
+	}
+
+	for id, args := range amqpTargets {
 		if !args.Enable {
 			continue
 		}
@@ -78,7 +127,7 @@ func RegisterNotificationTargets(cfg config.Config, doneCh <-chan struct{}, root
 		}
 	}
 
-	for id, args := range GetNotifyES(cfg) {
+	for id, args := range esTargets {
 		if !args.Enable {
 			continue
 		}
@@ -96,7 +145,7 @@ func RegisterNotificationTargets(cfg config.Config, doneCh <-chan struct{}, root
 		}
 	}
 
-	for id, args := range GetNotifyKafka(cfg) {
+	for id, args := range kafkaTargets {
 		if !args.Enable {
 			continue
 		}
@@ -114,7 +163,7 @@ func RegisterNotificationTargets(cfg config.Config, doneCh <-chan struct{}, root
 		}
 	}
 
-	for id, args := range GetNotifyMQTT(cfg, rootCAs) {
+	for id, args := range mqttTargets {
 		if !args.Enable {
 			continue
 		}
@@ -132,7 +181,7 @@ func RegisterNotificationTargets(cfg config.Config, doneCh <-chan struct{}, root
 		}
 	}
 
-	for id, args := range GetNotifyMySQL(cfg) {
+	for id, args := range mysqlTargets {
 		if !args.Enable {
 			continue
 		}
@@ -149,7 +198,7 @@ func RegisterNotificationTargets(cfg config.Config, doneCh <-chan struct{}, root
 		}
 	}
 
-	for id, args := range GetNotifyNATS(cfg) {
+	for id, args := range natsTargets {
 		if !args.Enable {
 			continue
 		}
@@ -166,7 +215,7 @@ func RegisterNotificationTargets(cfg config.Config, doneCh <-chan struct{}, root
 		}
 	}
 
-	for id, args := range GetNotifyNSQ(cfg) {
+	for id, args := range nsqTargets {
 		if !args.Enable {
 			continue
 		}
@@ -183,7 +232,7 @@ func RegisterNotificationTargets(cfg config.Config, doneCh <-chan struct{}, root
 		}
 	}
 
-	for id, args := range GetNotifyPostgres(cfg) {
+	for id, args := range postgresTargets {
 		if !args.Enable {
 			continue
 		}
@@ -200,7 +249,7 @@ func RegisterNotificationTargets(cfg config.Config, doneCh <-chan struct{}, root
 		}
 	}
 
-	for id, args := range GetNotifyRedis(cfg) {
+	for id, args := range redisTargets {
 		if !args.Enable {
 			continue
 		}
@@ -217,7 +266,7 @@ func RegisterNotificationTargets(cfg config.Config, doneCh <-chan struct{}, root
 		}
 	}
 
-	for id, args := range GetNotifyWebhook(cfg, rootCAs) {
+	for id, args := range webhookTargets {
 		if !args.Enable {
 			continue
 		}
@@ -307,17 +356,16 @@ var (
 )
 
 // GetNotifyKafka - returns a map of registered notification 'kafka' targets
-func GetNotifyKafka(s config.Config) map[string]target.KafkaArgs {
+func GetNotifyKafka(kafkaKVS map[string]config.KVS) (map[string]target.KafkaArgs, error) {
 	kafkaTargets := make(map[string]target.KafkaArgs)
-	for k, kv := range mergeTargets(s[config.NotifyKafkaSubSys], target.EnvKafkaState, DefaultKafkaKVS) {
+	for k, kv := range mergeTargets(kafkaKVS, target.EnvKafkaState, DefaultKafkaKVS) {
 		stateEnv := target.EnvKafkaState
 		if k != config.Default {
 			stateEnv = stateEnv + config.Default + k
 		}
 		enabled, err := config.ParseBool(env.Get(stateEnv, kv.Get(config.State)))
 		if err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 		if !enabled {
 			continue
@@ -328,6 +376,9 @@ func GetNotifyKafka(s config.Config) map[string]target.KafkaArgs {
 			brokersEnv = brokersEnv + config.Default + k
 		}
 		kafkaBrokers := env.Get(brokersEnv, kv.Get(target.KafkaBrokers))
+		if len(kafkaBrokers) == 0 {
+			return nil, config.Error("kafka 'brokers' cannot be empty")
+		}
 		for _, s := range strings.Split(kafkaBrokers, config.ValueSeparator) {
 			var host *xnet.Host
 			host, err = xnet.ParseHost(s)
@@ -337,8 +388,7 @@ func GetNotifyKafka(s config.Config) map[string]target.KafkaArgs {
 			brokers = append(brokers, *host)
 		}
 		if err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 
 		queueLimitEnv := target.EnvKafkaQueueLimit
@@ -347,8 +397,7 @@ func GetNotifyKafka(s config.Config) map[string]target.KafkaArgs {
 		}
 		queueLimit, err := strconv.ParseUint(env.Get(queueLimitEnv, kv.Get(target.KafkaQueueLimit)), 10, 64)
 		if err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 
 		clientAuthEnv := target.EnvKafkaTLSClientAuth
@@ -357,8 +406,7 @@ func GetNotifyKafka(s config.Config) map[string]target.KafkaArgs {
 		}
 		clientAuth, err := strconv.Atoi(env.Get(clientAuthEnv, kv.Get(target.KafkaTLSClientAuth)))
 		if err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 
 		topicEnv := target.EnvKafkaTopic
@@ -408,14 +456,13 @@ func GetNotifyKafka(s config.Config) map[string]target.KafkaArgs {
 		kafkaArgs.SASL.Password = env.Get(saslPasswordEnv, kv.Get(target.KafkaSASLPassword))
 
 		if err = kafkaArgs.Validate(); err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 
 		kafkaTargets[k] = kafkaArgs
 	}
 
-	return kafkaTargets
+	return kafkaTargets, nil
 }
 
 // DefaultMQTTKVS - default MQTT config
@@ -436,9 +483,9 @@ var (
 )
 
 // GetNotifyMQTT - returns a map of registered notification 'mqtt' targets
-func GetNotifyMQTT(s config.Config, rootCAs *x509.CertPool) map[string]target.MQTTArgs {
+func GetNotifyMQTT(mqttKVS map[string]config.KVS, rootCAs *x509.CertPool) (map[string]target.MQTTArgs, error) {
 	mqttTargets := make(map[string]target.MQTTArgs)
-	for k, kv := range mergeTargets(s[config.NotifyMQTTSubSys], target.EnvMQTTState, DefaultMQTTKVS) {
+	for k, kv := range mergeTargets(mqttKVS, target.EnvMQTTState, DefaultMQTTKVS) {
 		stateEnv := target.EnvMQTTState
 		if k != config.Default {
 			stateEnv = stateEnv + config.Default + k
@@ -446,8 +493,7 @@ func GetNotifyMQTT(s config.Config, rootCAs *x509.CertPool) map[string]target.MQ
 
 		enabled, err := config.ParseBool(env.Get(stateEnv, kv.Get(config.State)))
 		if err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 		if !enabled {
 			continue
@@ -459,8 +505,7 @@ func GetNotifyMQTT(s config.Config, rootCAs *x509.CertPool) map[string]target.MQ
 		}
 		brokerURL, err := xnet.ParseURL(env.Get(brokerEnv, kv.Get(target.MqttBroker)))
 		if err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 
 		reconnectIntervalEnv := target.EnvMQTTReconnectInterval
@@ -470,8 +515,7 @@ func GetNotifyMQTT(s config.Config, rootCAs *x509.CertPool) map[string]target.MQ
 		reconnectInterval, err := time.ParseDuration(env.Get(reconnectIntervalEnv,
 			kv.Get(target.MqttReconnectInterval)))
 		if err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 
 		keepAliveIntervalEnv := target.EnvMQTTKeepAliveInterval
@@ -481,8 +525,7 @@ func GetNotifyMQTT(s config.Config, rootCAs *x509.CertPool) map[string]target.MQ
 		keepAliveInterval, err := time.ParseDuration(env.Get(keepAliveIntervalEnv,
 			kv.Get(target.MqttKeepAliveInterval)))
 		if err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 
 		queueLimitEnv := target.EnvMQTTQueueLimit
@@ -491,8 +534,7 @@ func GetNotifyMQTT(s config.Config, rootCAs *x509.CertPool) map[string]target.MQ
 		}
 		queueLimit, err := strconv.ParseUint(env.Get(queueLimitEnv, kv.Get(target.MqttQueueLimit)), 10, 64)
 		if err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 
 		qosEnv := target.EnvMQTTQoS
@@ -503,8 +545,7 @@ func GetNotifyMQTT(s config.Config, rootCAs *x509.CertPool) map[string]target.MQ
 		// Parse uint8 value
 		qos, err := strconv.ParseUint(env.Get(qosEnv, kv.Get(target.MqttQoS)), 10, 8)
 		if err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 
 		topicEnv := target.EnvMQTTTopic
@@ -542,12 +583,11 @@ func GetNotifyMQTT(s config.Config, rootCAs *x509.CertPool) map[string]target.MQ
 		}
 
 		if err = mqttArgs.Validate(); err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 		mqttTargets[k] = mqttArgs
 	}
-	return mqttTargets
+	return mqttTargets, nil
 }
 
 // DefaultMySQLKVS - default KV for MySQL
@@ -569,9 +609,9 @@ var (
 )
 
 // GetNotifyMySQL - returns a map of registered notification 'mysql' targets
-func GetNotifyMySQL(s config.Config) map[string]target.MySQLArgs {
+func GetNotifyMySQL(mysqlKVS map[string]config.KVS) (map[string]target.MySQLArgs, error) {
 	mysqlTargets := make(map[string]target.MySQLArgs)
-	for k, kv := range mergeTargets(s[config.NotifyMySQLSubSys], target.EnvMySQLState, DefaultMySQLKVS) {
+	for k, kv := range mergeTargets(mysqlKVS, target.EnvMySQLState, DefaultMySQLKVS) {
 		stateEnv := target.EnvMySQLState
 		if k != config.Default {
 			stateEnv = stateEnv + config.Default + k
@@ -579,8 +619,7 @@ func GetNotifyMySQL(s config.Config) map[string]target.MySQLArgs {
 
 		enabled, err := config.ParseBool(env.Get(stateEnv, kv.Get(config.State)))
 		if err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 		if !enabled {
 			continue
@@ -593,8 +632,7 @@ func GetNotifyMySQL(s config.Config) map[string]target.MySQLArgs {
 
 		host, err := xnet.ParseURL(env.Get(hostEnv, kv.Get(target.MySQLHost)))
 		if err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 
 		queueLimitEnv := target.EnvMySQLQueueLimit
@@ -603,8 +641,7 @@ func GetNotifyMySQL(s config.Config) map[string]target.MySQLArgs {
 		}
 		queueLimit, err := strconv.ParseUint(env.Get(queueLimitEnv, kv.Get(target.MySQLQueueLimit)), 10, 64)
 		if err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 
 		formatEnv := target.EnvMySQLFormat
@@ -653,12 +690,11 @@ func GetNotifyMySQL(s config.Config) map[string]target.MySQLArgs {
 			QueueLimit: queueLimit,
 		}
 		if err = mysqlArgs.Validate(); err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 		mysqlTargets[k] = mysqlArgs
 	}
-	return mysqlTargets
+	return mysqlTargets, nil
 }
 
 // DefaultNATSKVS - NATS KV for nats config.
@@ -683,9 +719,9 @@ var (
 )
 
 // GetNotifyNATS - returns a map of registered notification 'nats' targets
-func GetNotifyNATS(s config.Config) map[string]target.NATSArgs {
+func GetNotifyNATS(natsKVS map[string]config.KVS) (map[string]target.NATSArgs, error) {
 	natsTargets := make(map[string]target.NATSArgs)
-	for k, kv := range mergeTargets(s[config.NotifyNATSSubSys], target.EnvNATSState, DefaultNATSKVS) {
+	for k, kv := range mergeTargets(natsKVS, target.EnvNATSState, DefaultNATSKVS) {
 		stateEnv := target.EnvNATSState
 		if k != config.Default {
 			stateEnv = stateEnv + config.Default + k
@@ -693,8 +729,7 @@ func GetNotifyNATS(s config.Config) map[string]target.NATSArgs {
 
 		enabled, err := config.ParseBool(env.Get(stateEnv, kv.Get(config.State)))
 		if err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 		if !enabled {
 			continue
@@ -707,8 +742,7 @@ func GetNotifyNATS(s config.Config) map[string]target.NATSArgs {
 
 		address, err := xnet.ParseHost(env.Get(addressEnv, kv.Get(target.NATSAddress)))
 		if err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 
 		pingIntervalEnv := target.EnvNATSPingInterval
@@ -718,8 +752,7 @@ func GetNotifyNATS(s config.Config) map[string]target.NATSArgs {
 
 		pingInterval, err := strconv.ParseInt(env.Get(pingIntervalEnv, kv.Get(target.NATSPingInterval)), 10, 64)
 		if err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 
 		queueLimitEnv := target.EnvNATSQueueLimit
@@ -729,8 +762,7 @@ func GetNotifyNATS(s config.Config) map[string]target.NATSArgs {
 
 		queueLimit, err := strconv.ParseUint(env.Get(queueLimitEnv, kv.Get(target.NATSQueueLimit)), 10, 64)
 		if err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 
 		secureEnv := target.EnvNATSSecure
@@ -794,8 +826,7 @@ func GetNotifyNATS(s config.Config) map[string]target.NATSArgs {
 			maxPubAcksInflight, err := strconv.Atoi(env.Get(maxPubAcksInflightEnv,
 				kv.Get(target.NATSStreamingMaxPubAcksInFlight)))
 			if err != nil {
-				logger.LogIf(context.Background(), err)
+				return nil, err
-				continue
 			}
 			clusterIDEnv := target.EnvNATSStreamingClusterID
 			if k != config.Default {
@@ -808,13 +839,12 @@ func GetNotifyNATS(s config.Config) map[string]target.NATSArgs {
 		}
 
 		if err = natsArgs.Validate(); err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 
 		natsTargets[k] = natsArgs
 	}
-	return natsTargets
+	return natsTargets, nil
 }
 
 // DefaultNSQKVS - NSQ KV for config
@@ -832,9 +862,9 @@ var (
 )
 
 // GetNotifyNSQ - returns a map of registered notification 'nsq' targets
-func GetNotifyNSQ(s config.Config) map[string]target.NSQArgs {
+func GetNotifyNSQ(nsqKVS map[string]config.KVS) (map[string]target.NSQArgs, error) {
 	nsqTargets := make(map[string]target.NSQArgs)
-	for k, kv := range mergeTargets(s[config.NotifyNSQSubSys], target.EnvNSQState, DefaultNSQKVS) {
+	for k, kv := range mergeTargets(nsqKVS, target.EnvNSQState, DefaultNSQKVS) {
 		stateEnv := target.EnvNSQState
 		if k != config.Default {
 			stateEnv = stateEnv + config.Default + k
@@ -842,8 +872,7 @@ func GetNotifyNSQ(s config.Config) map[string]target.NSQArgs {
 
 		enabled, err := config.ParseBool(env.Get(stateEnv, kv.Get(config.State)))
 		if err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 		if !enabled {
 			continue
@@ -855,8 +884,7 @@ func GetNotifyNSQ(s config.Config) map[string]target.NSQArgs {
 		}
 		nsqdAddress, err := xnet.ParseHost(env.Get(addressEnv, kv.Get(target.NSQAddress)))
 		if err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 		tlsEnableEnv := target.EnvNSQTLSEnable
 		if k != config.Default {
@@ -873,8 +901,7 @@ func GetNotifyNSQ(s config.Config) map[string]target.NSQArgs {
 		}
 		queueLimit, err := strconv.ParseUint(env.Get(queueLimitEnv, kv.Get(target.NSQQueueLimit)), 10, 64)
 		if err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 
 		topicEnv := target.EnvNSQTopic
@@ -897,13 +924,12 @@ func GetNotifyNSQ(s config.Config) map[string]target.NSQArgs {
 		nsqArgs.TLS.SkipVerify = env.Get(tlsSkipVerifyEnv, kv.Get(target.NSQTLSSkipVerify)) == config.StateOn
 
 		if err = nsqArgs.Validate(); err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 
 		nsqTargets[k] = nsqArgs
 	}
-	return nsqTargets
+	return nsqTargets, nil
 }
 
 // DefaultPostgresKVS - default Postgres KV for server config.
@@ -925,9 +951,9 @@ var (
 )
 
 // GetNotifyPostgres - returns a map of registered notification 'postgres' targets
-func GetNotifyPostgres(s config.Config) map[string]target.PostgreSQLArgs {
+func GetNotifyPostgres(postgresKVS map[string]config.KVS) (map[string]target.PostgreSQLArgs, error) {
 	psqlTargets := make(map[string]target.PostgreSQLArgs)
-	for k, kv := range mergeTargets(s[config.NotifyPostgresSubSys], target.EnvPostgresState, DefaultPostgresKVS) {
+	for k, kv := range mergeTargets(postgresKVS, target.EnvPostgresState, DefaultPostgresKVS) {
 		stateEnv := target.EnvPostgresState
 		if k != config.Default {
 			stateEnv = stateEnv + config.Default + k
@@ -935,8 +961,7 @@ func GetNotifyPostgres(s config.Config) map[string]target.PostgreSQLArgs {
 
 		enabled, err := config.ParseBool(env.Get(stateEnv, kv.Get(config.State)))
 		if err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 		if !enabled {
 			continue
@@ -949,8 +974,7 @@ func GetNotifyPostgres(s config.Config) map[string]target.PostgreSQLArgs {
 
 		host, err := xnet.ParseHost(env.Get(hostEnv, kv.Get(target.PostgresHost)))
 		if err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 
 		queueLimitEnv := target.EnvPostgresQueueLimit
@@ -960,8 +984,7 @@ func GetNotifyPostgres(s config.Config) map[string]target.PostgreSQLArgs {
 
 		queueLimit, err := strconv.Atoi(env.Get(queueLimitEnv, kv.Get(target.PostgresQueueLimit)))
 		if err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 
 		formatEnv := target.EnvPostgresFormat
@@ -1018,12 +1041,12 @@ func GetNotifyPostgres(s config.Config) map[string]target.PostgreSQLArgs {
 			QueueLimit:       uint64(queueLimit),
 		}
 		if err = psqlArgs.Validate(); err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 		psqlTargets[k] = psqlArgs
 	}
-	return psqlTargets
+
+	return psqlTargets, nil
 }
 
 // DefaultRedisKVS - default KV for redis config
@@ -1041,9 +1064,9 @@ var (
 )
 
 // GetNotifyRedis - returns a map of registered notification 'redis' targets
-func GetNotifyRedis(s config.Config) map[string]target.RedisArgs {
+func GetNotifyRedis(redisKVS map[string]config.KVS) (map[string]target.RedisArgs, error) {
 	redisTargets := make(map[string]target.RedisArgs)
-	for k, kv := range mergeTargets(s[config.NotifyRedisSubSys], target.EnvRedisState, DefaultRedisKVS) {
+	for k, kv := range mergeTargets(redisKVS, target.EnvRedisState, DefaultRedisKVS) {
 		stateEnv := target.EnvRedisState
 		if k != config.Default {
 			stateEnv = stateEnv + config.Default + k
@@ -1051,8 +1074,7 @@ func GetNotifyRedis(s config.Config) map[string]target.RedisArgs {
 
 		enabled, err := config.ParseBool(env.Get(stateEnv, kv.Get(config.State)))
 		if err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 		if !enabled {
 			continue
@@ -1064,8 +1086,7 @@ func GetNotifyRedis(s config.Config) map[string]target.RedisArgs {
 		}
 		addr, err := xnet.ParseHost(env.Get(addressEnv, kv.Get(target.RedisAddress)))
 		if err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 		queueLimitEnv := target.EnvRedisQueueLimit
 		if k != config.Default {
@@ -1073,8 +1094,7 @@ func GetNotifyRedis(s config.Config) map[string]target.RedisArgs {
 		}
 		queueLimit, err := strconv.Atoi(env.Get(queueLimitEnv, kv.Get(target.RedisQueueLimit)))
 		if err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 		formatEnv := target.EnvRedisFormat
 		if k != config.Default {
@@ -1102,12 +1122,11 @@ func GetNotifyRedis(s config.Config) map[string]target.RedisArgs {
 			QueueLimit: uint64(queueLimit),
 		}
 		if err = redisArgs.Validate(); err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 		redisTargets[k] = redisArgs
 	}
-	return redisTargets
+	return redisTargets, nil
 }
 
 // DefaultWebhookKVS - default KV for webhook config
@@ -1123,17 +1142,16 @@ var (
 )
 
 // GetNotifyWebhook - returns a map of registered notification 'webhook' targets
-func GetNotifyWebhook(s config.Config, rootCAs *x509.CertPool) map[string]target.WebhookArgs {
+func GetNotifyWebhook(webhookKVS map[string]config.KVS, rootCAs *x509.CertPool) (map[string]target.WebhookArgs, error) {
 	webhookTargets := make(map[string]target.WebhookArgs)
-	for k, kv := range mergeTargets(s[config.NotifyWebhookSubSys], target.EnvWebhookState, DefaultWebhookKVS) {
+	for k, kv := range mergeTargets(webhookKVS, target.EnvWebhookState, DefaultWebhookKVS) {
 		stateEnv := target.EnvWebhookState
 		if k != config.Default {
 			stateEnv = stateEnv + config.Default + k
 		}
 		enabled, err := config.ParseBool(env.Get(stateEnv, kv.Get(config.State)))
 		if err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 		if !enabled {
 			continue
@@ -1142,10 +1160,9 @@ func GetNotifyWebhook(s config.Config, rootCAs *x509.CertPool) map[string]target
 		if k != config.Default {
 			urlEnv = urlEnv + config.Default + k
 		}
-		url, err := xnet.ParseURL(env.Get(urlEnv, kv.Get(target.WebhookEndpoint)))
+		url, err := xnet.ParseHTTPURL(env.Get(urlEnv, kv.Get(target.WebhookEndpoint)))
 		if err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 		queueLimitEnv := target.EnvWebhookQueueLimit
 		if k != config.Default {
@@ -1153,8 +1170,7 @@ func GetNotifyWebhook(s config.Config, rootCAs *x509.CertPool) map[string]target
 		}
 		queueLimit, err := strconv.Atoi(env.Get(queueLimitEnv, kv.Get(target.WebhookQueueLimit)))
 		if err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 		queueDirEnv := target.EnvWebhookQueueDir
 		if k != config.Default {
@@ -1174,12 +1190,11 @@ func GetNotifyWebhook(s config.Config, rootCAs *x509.CertPool) map[string]target
 			QueueLimit: uint64(queueLimit),
 		}
 		if err = webhookArgs.Validate(); err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 		webhookTargets[k] = webhookArgs
 	}
-	return webhookTargets
+	return webhookTargets, nil
 }
 
 // DefaultESKVS - default KV config for Elasticsearch target
@@ -1196,17 +1211,16 @@ var (
 )
 
 // GetNotifyES - returns a map of registered notification 'elasticsearch' targets
-func GetNotifyES(s config.Config) map[string]target.ElasticsearchArgs {
+func GetNotifyES(esKVS map[string]config.KVS) (map[string]target.ElasticsearchArgs, error) {
 	esTargets := make(map[string]target.ElasticsearchArgs)
-	for k, kv := range mergeTargets(s[config.NotifyESSubSys], target.EnvElasticState, DefaultESKVS) {
+	for k, kv := range mergeTargets(esKVS, target.EnvElasticState, DefaultESKVS) {
 		stateEnv := target.EnvElasticState
 		if k != config.Default {
 			stateEnv = stateEnv + config.Default + k
 		}
 		enabled, err := config.ParseBool(env.Get(stateEnv, kv.Get(config.State)))
 		if err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 		if !enabled {
 			continue
@@ -1217,10 +1231,9 @@ func GetNotifyES(s config.Config) map[string]target.ElasticsearchArgs {
 			urlEnv = urlEnv + config.Default + k
 		}
 
-		url, err := xnet.ParseURL(env.Get(urlEnv, kv.Get(target.ElasticURL)))
+		url, err := xnet.ParseHTTPURL(env.Get(urlEnv, kv.Get(target.ElasticURL)))
 		if err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 
 		queueLimitEnv := target.EnvElasticQueueLimit
@@ -1230,8 +1243,7 @@ func GetNotifyES(s config.Config) map[string]target.ElasticsearchArgs {
 
 		queueLimit, err := strconv.Atoi(env.Get(queueLimitEnv, kv.Get(target.ElasticQueueLimit)))
 		if err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 
 		formatEnv := target.EnvElasticFormat
@@ -1258,12 +1270,11 @@ func GetNotifyES(s config.Config) map[string]target.ElasticsearchArgs {
 			QueueLimit: uint64(queueLimit),
 		}
 		if err = esArgs.Validate(); err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 		esTargets[k] = esArgs
 	}
-	return esTargets
+	return esTargets, nil
 }
 
 // DefaultAMQPKVS - default KV for AMQP config
@@ -1287,30 +1298,27 @@ var (
 )
 
 // GetNotifyAMQP - returns a map of registered notification 'amqp' targets
-func GetNotifyAMQP(s config.Config) map[string]target.AMQPArgs {
+func GetNotifyAMQP(amqpKVS map[string]config.KVS) (map[string]target.AMQPArgs, error) {
 	amqpTargets := make(map[string]target.AMQPArgs)
-	for k, kv := range mergeTargets(s[config.NotifyAMQPSubSys], target.EnvAMQPState, DefaultAMQPKVS) {
+	for k, kv := range mergeTargets(amqpKVS, target.EnvAMQPState, DefaultAMQPKVS) {
 		stateEnv := target.EnvAMQPState
 		if k != config.Default {
 			stateEnv = stateEnv + config.Default + k
 		}
 		enabled, err := config.ParseBool(env.Get(stateEnv, kv.Get(config.State)))
 		if err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 		if !enabled {
 			continue
 		}
-
 		urlEnv := target.EnvAMQPURL
 		if k != config.Default {
 			urlEnv = urlEnv + config.Default + k
 		}
 		url, err := xnet.ParseURL(env.Get(urlEnv, kv.Get(target.AmqpURL)))
 		if err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 		deliveryModeEnv := target.EnvAMQPDeliveryMode
 		if k != config.Default {
@@ -1318,8 +1326,7 @@ func GetNotifyAMQP(s config.Config) map[string]target.AMQPArgs {
 		}
 		deliveryMode, err := strconv.Atoi(env.Get(deliveryModeEnv, kv.Get(target.AmqpDeliveryMode)))
 		if err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 		exchangeEnv := target.EnvAMQPExchange
 		if k != config.Default {
@@ -1367,8 +1374,7 @@ func GetNotifyAMQP(s config.Config) map[string]target.AMQPArgs {
 		}
 		queueLimit, err := strconv.ParseUint(env.Get(queueLimitEnv, kv.Get(target.AmqpQueueLimit)), 10, 64)
 		if err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 		amqpArgs := target.AMQPArgs{
 			Enable:       enabled,
@@ -1387,10 +1393,9 @@ func GetNotifyAMQP(s config.Config) map[string]target.AMQPArgs {
 			QueueLimit:   queueLimit,
 		}
 		if err = amqpArgs.Validate(); err != nil {
-			logger.LogIf(context.Background(), err)
+			return nil, err
-			continue
 		}
 		amqpTargets[k] = amqpArgs
 	}
-	return amqpTargets
+	return amqpTargets, nil
 }

cmd/config/policy/opa/config.go

@@ -124,7 +124,7 @@ func LookupConfig(kv config.KVS, transport *http.Transport, closeRespFn func(io.
 		authToken = env.Get(EnvPolicyOpaAuthToken, kv.Get(AuthToken))
 	}
 
-	u, err := xnet.ParseURL(opaURL)
+	u, err := xnet.ParseHTTPURL(opaURL)
 	if err != nil {
 		return args, err
 	}

cmd/crypto/config.go

@@ -21,6 +21,7 @@ import (
 
 	"github.com/minio/minio/cmd/config"
 	"github.com/minio/minio/pkg/env"
+	xnet "github.com/minio/minio/pkg/net"
 )
 
 // KMSConfig has the KMS config for hashicorp vault
@@ -148,9 +149,21 @@ func LookupConfig(kvs config.KVS) (KMSConfig, error) {
 	if !stateBool {
 		return kmsCfg, nil
 	}
-	vcfg := VaultConfig{}
+	vcfg := VaultConfig{
-	// Lookup Hashicorp-Vault configuration & overwrite config entry if ENV var is present
+		Auth: VaultAuth{
-	vcfg.Endpoint = env.Get(EnvKMSVaultEndpoint, kvs.Get(KMSVaultEndpoint))
+			Type: "approle",
+		},
+	}
+	endpointStr := env.Get(EnvKMSVaultEndpoint, kvs.Get(KMSVaultEndpoint))
+	if endpointStr != "" {
+		// Lookup Hashicorp-Vault configuration & overwrite config entry if ENV var is present
+		endpoint, err := xnet.ParseHTTPURL(endpointStr)
+		if err != nil {
+			return kmsCfg, err
+		}
+		endpointStr = endpoint.String()
+	}
+	vcfg.Endpoint = endpointStr
 	vcfg.CAPath = env.Get(EnvKMSVaultCAPath, kvs.Get(KMSVaultCAPath))
 	vcfg.Auth.Type = env.Get(EnvKMSVaultAuthType, kvs.Get(KMSVaultAuthType))
 	vcfg.Auth.AppRole.ID = env.Get(EnvKMSVaultAppRoleID, kvs.Get(KMSVaultAppRoleID))
@@ -177,7 +190,7 @@ func LookupConfig(kvs config.KVS) (KMSConfig, error) {
 // NewKMS - initialize a new KMS.
 func NewKMS(cfg KMSConfig) (kms KMS, err error) {
 	// Lookup KMS master keys - only available through ENV.
-	if masterKeyLegacy, ok := env.Lookup(EnvKMSMasterKeyLegacy); ok {
+	if masterKeyLegacy := env.Get(EnvKMSMasterKeyLegacy, ""); len(masterKeyLegacy) != 0 {
 		if !cfg.Vault.IsEmpty() { // Vault and KMS master key provided
 			return kms, errors.New("Ambiguous KMS configuration: vault configuration and a master key are provided at the same time")
 		}
@@ -185,7 +198,7 @@ func NewKMS(cfg KMSConfig) (kms KMS, err error) {
 		if err != nil {
 			return kms, err
 		}
-	} else if masterKey, ok := env.Lookup(EnvKMSMasterKey); ok {
+	} else if masterKey := env.Get(EnvKMSMasterKey, ""); len(masterKey) != 0 {
 		if !cfg.Vault.IsEmpty() { // Vault and KMS master key provided
 			return kms, errors.New("Ambiguous KMS configuration: vault configuration and a master key are provided at the same time")
 		}

cmd/crypto/legacy.go

@@ -22,6 +22,7 @@ import (
 
 	"github.com/minio/minio/cmd/config"
 	"github.com/minio/minio/pkg/env"
+	xnet "github.com/minio/minio/pkg/net"
 )
 
 const (
@@ -119,9 +120,16 @@ func lookupConfigLegacy(kvs config.KVS) (KMSConfig, error) {
 	if err != nil {
 		return KMSConfig{}, err
 	}
+
 	cfg := KMSConfig{
 		AutoEncryption: autoBool,
+		Vault: VaultConfig{
+			Auth: VaultAuth{
+				Type: "approle",
+			},
+		},
 	}
+
 	// Assume default as "on" for legacy config since we didn't have a _STATE
 	// flag to turn it off, but we should honor it nonetheless to turn it off
 	// if the vault endpoint is down and there is no way to start the server.
@@ -132,29 +140,37 @@ func lookupConfigLegacy(kvs config.KVS) (KMSConfig, error) {
 	if !stateBool {
 		return cfg, nil
 	}
-	vcfg := VaultConfig{}
+
-	// Lookup Hashicorp-Vault configuration & overwrite config entry if ENV var is present
+	endpointStr := env.Get(EnvKMSVaultEndpoint, kvs.Get(KMSVaultEndpoint))
-	vcfg.Endpoint = env.Get(EnvVaultEndpoint, kvs.Get(KMSVaultEndpoint))
+	if endpointStr != "" {
-	vcfg.CAPath = env.Get(EnvVaultCAPath, kvs.Get(KMSVaultCAPath))
+		// Lookup Hashicorp-Vault configuration & overwrite config entry if ENV var is present
-	vcfg.Auth.Type = env.Get(EnvVaultAuthType, kvs.Get(KMSVaultAuthType))
+		endpoint, err := xnet.ParseHTTPURL(endpointStr)
-	vcfg.Auth.AppRole.ID = env.Get(EnvVaultAppRoleID, kvs.Get(KMSVaultAppRoleID))
+		if err != nil {
-	vcfg.Auth.AppRole.Secret = env.Get(EnvVaultAppSecretID, kvs.Get(KMSVaultAppRoleSecret))
+			return cfg, err
-	vcfg.Key.Name = env.Get(EnvVaultKeyName, kvs.Get(KMSVaultKeyName))
+		}
-	vcfg.Namespace = env.Get(EnvVaultNamespace, kvs.Get(KMSVaultNamespace))
+		endpointStr = endpoint.String()
+	}
+
+	cfg.Vault.Endpoint = endpointStr
+	cfg.Vault.CAPath = env.Get(EnvVaultCAPath, kvs.Get(KMSVaultCAPath))
+	cfg.Vault.Auth.Type = env.Get(EnvVaultAuthType, kvs.Get(KMSVaultAuthType))
+	cfg.Vault.Auth.AppRole.ID = env.Get(EnvVaultAppRoleID, kvs.Get(KMSVaultAppRoleID))
+	cfg.Vault.Auth.AppRole.Secret = env.Get(EnvVaultAppSecretID, kvs.Get(KMSVaultAppRoleSecret))
+	cfg.Vault.Key.Name = env.Get(EnvVaultKeyName, kvs.Get(KMSVaultKeyName))
+	cfg.Vault.Namespace = env.Get(EnvVaultNamespace, kvs.Get(KMSVaultNamespace))
 	keyVersion := env.Get(EnvVaultKeyVersion, kvs.Get(KMSVaultKeyVersion))
 
 	if keyVersion != "" {
-		vcfg.Key.Version, err = strconv.Atoi(keyVersion)
+		cfg.Vault.Key.Version, err = strconv.Atoi(keyVersion)
 		if err != nil {
 			return cfg, fmt.Errorf("Invalid ENV variable: Unable to parse %s value (`%s`)",
 				EnvVaultKeyVersion, keyVersion)
 		}
 	}
 
-	if err = vcfg.Verify(); err != nil {
+	if err = cfg.Vault.Verify(); err != nil {
 		return cfg, err
 	}
 
-	cfg.Vault = vcfg
 	return cfg, nil
 }

cmd/daily-lifecycle-ops.go

@@ -55,7 +55,7 @@ func startDailyLifecycle() {
 
 	// Wait until the object API is ready
 	for {
-		objAPI = newObjectLayerFn()
+		objAPI = globalObjectAPI
 		if objAPI == nil {
 			time.Sleep(time.Second)
 			continue

cmd/disk-cache.go

@@ -553,23 +553,23 @@ func newServerCacheObjects(ctx context.Context, config cache.Config) (CacheObjec
 		migrating: migrateSw,
 		migMutex:  sync.Mutex{},
 		GetObjectInfoFn: func(ctx context.Context, bucket, object string, opts ObjectOptions) (ObjectInfo, error) {
-			return newObjectLayerFn().GetObjectInfo(ctx, bucket, object, opts)
+			return globalObjectAPI.GetObjectInfo(ctx, bucket, object, opts)
 		},
 		GetObjectNInfoFn: func(ctx context.Context, bucket, object string, rs *HTTPRangeSpec, h http.Header, lockType LockType, opts ObjectOptions) (gr *GetObjectReader, err error) {
-			return newObjectLayerFn().GetObjectNInfo(ctx, bucket, object, rs, h, lockType, opts)
+			return globalObjectAPI.GetObjectNInfo(ctx, bucket, object, rs, h, lockType, opts)
 		},
 		DeleteObjectFn: func(ctx context.Context, bucket, object string) error {
-			return newObjectLayerFn().DeleteObject(ctx, bucket, object)
+			return globalObjectAPI.DeleteObject(ctx, bucket, object)
 		},
 		DeleteObjectsFn: func(ctx context.Context, bucket string, objects []string) ([]error, error) {
 			errs := make([]error, len(objects))
 			for idx, object := range objects {
-				errs[idx] = newObjectLayerFn().DeleteObject(ctx, bucket, object)
+				errs[idx] = globalObjectAPI.DeleteObject(ctx, bucket, object)
 			}
 			return errs, nil
 		},
 		PutObjectFn: func(ctx context.Context, bucket, object string, data *PutObjReader, opts ObjectOptions) (objInfo ObjectInfo, err error) {
-			return newObjectLayerFn().PutObject(ctx, bucket, object, data, opts)
+			return globalObjectAPI.PutObject(ctx, bucket, object, data, opts)
 		},
 	}
 	if migrateSw {

cmd/endpoint.go

@@ -32,7 +32,6 @@ import (
 	"github.com/minio/cli"
 	"github.com/minio/minio-go/v6/pkg/set"
 	"github.com/minio/minio/cmd/config"
-	"github.com/minio/minio/cmd/config/etcd"
 	"github.com/minio/minio/cmd/logger"
 	"github.com/minio/minio/pkg/env"
 	"github.com/minio/minio/pkg/mountinfo"
@@ -590,10 +589,8 @@ func CreateEndpoints(serverAddr string, args ...[]string) (string, EndpointList,
 		return serverAddr, endpoints, setupType, err
 	}
 
-	_, dok := env.Lookup(config.EnvDomain)
+	publicIPs := env.Get(config.EnvPublicIPs, "")
-	_, eok := env.Lookup(etcd.EnvEtcdEndpoints)
+	if len(publicIPs) == 0 {
-	_, iok := env.Lookup(config.EnvPublicIPs)
-	if dok && eok && !iok {
 		updateDomainIPs(uniqueArgs)
 	}
 

cmd/gateway-common.go

@@ -374,15 +374,6 @@ func parseGatewaySSE(s string) (gatewaySSE, error) {
 
 // handle gateway env vars
 func handleGatewayEnvVars() {
-	gwsseVal, ok := env.Lookup("MINIO_GATEWAY_SSE")
-	if ok {
-		var err error
-		GlobalGatewaySSE, err = parseGatewaySSE(gwsseVal)
-		if err != nil {
-			logger.Fatal(err, "Unable to parse MINIO_GATEWAY_SSE value (`%s`)", gwsseVal)
-		}
-	}
-
 	accessKey := env.Get(config.EnvAccessKey, "")
 	secretKey := env.Get(config.EnvSecretKey, "")
 	cred, err := auth.CreateCredentials(accessKey, secretKey)
@@ -391,4 +382,13 @@ func handleGatewayEnvVars() {
 			"Unable to validate credentials inherited from the shell environment")
 	}
 	globalActiveCred = cred
+
+	gwsseVal := env.Get("MINIO_GATEWAY_SSE", "")
+	if len(gwsseVal) != 0 {
+		var err error
+		GlobalGatewaySSE, err = parseGatewaySSE(gwsseVal)
+		if err != nil {
+			logger.Fatal(err, "Unable to parse MINIO_GATEWAY_SSE value (`%s`)", gwsseVal)
+		}
+	}
 }

cmd/gateway-main.go

@@ -206,7 +206,9 @@ func StartGateway(ctx *cli.Context, gw Gateway) {
 		srvCfg := newServerConfig()
 
 		// Override any values from ENVs.
-		lookupConfigs(srvCfg)
+		if err := lookupConfigs(srvCfg); err != nil {
+			logger.FatalIf(err, "Unable to initialize server config")
+		}
 
 		// hold the mutex lock before a new config is assigned.
 		globalServerConfigMu.Lock()
@@ -232,7 +234,7 @@ func StartGateway(ctx *cli.Context, gw Gateway) {
 		// Create a new config system.
 		globalConfigSys = NewConfigSys()
 
-		// Load globalServerConfig from etcd
+		// Load globalServerConfig from disk
 		logger.LogIf(context.Background(), globalConfigSys.Init(newObject))
 
 		// Start watching disk for reloading config, this
@@ -267,7 +269,10 @@ func StartGateway(ctx *cli.Context, gw Gateway) {
 	globalLifecycleSys = NewLifecycleSys()
 
 	// Create new notification system.
-	globalNotificationSys = NewNotificationSys(globalServerConfig, globalEndpoints)
+	globalNotificationSys, err = NewNotificationSys(globalServerConfig, globalEndpoints)
+	if err != nil {
+		logger.FatalIf(err, "Unable to initialize notification system")
+	}
 
 	// Verify if object layer supports
 	// - encryption

cmd/gateway-startup-msg.go

@@ -28,9 +28,8 @@ import (
 func printGatewayStartupMessage(apiEndPoints []string, backendType string) {
 	strippedAPIEndpoints := stripStandardPorts(apiEndPoints)
 	// If cache layer is enabled, print cache capacity.
-	cacheObjectAPI := newCacheObjectsFn()
+	if globalCacheObjectAPI != nil {
-	if cacheObjectAPI != nil {
+		printCacheStorageInfo(globalCacheObjectAPI.StorageInfo(context.Background()))
-		printCacheStorageInfo(cacheObjectAPI.StorageInfo(context.Background()))
 	}
 	// Prints credential.
 	printGatewayCommonMsg(strippedAPIEndpoints)

cmd/global-heal.go

@@ -156,7 +156,7 @@ func execLeaderTasks(sets *xlSets) {
 func startGlobalHeal() {
 	var objAPI ObjectLayer
 	for {
-		objAPI = newObjectLayerFn()
+		objAPI = globalObjectAPI
 		if objAPI == nil {
 			time.Sleep(time.Second)
 			continue

cmd/globals.go

@@ -251,6 +251,11 @@ var (
 	globalBackgroundHealRoutine *healRoutine
 	globalBackgroundHealState   *allHealState
 
+	// Only enabled when one of the sub-systems fail
+	// to initialize, this allows for administrators to
+	// fix the system.
+	globalSafeMode bool
+
 	// Add new variable global values here.
 )
 

cmd/healthcheck-handler.go

@@ -52,9 +52,9 @@ func ReadinessCheckHandler(w http.ResponseWriter, r *http.Request) {
 func LivenessCheckHandler(w http.ResponseWriter, r *http.Request) {
 	ctx := newContext(r, w, "LivenessCheckHandler")
 
-	objLayer := newObjectLayerFn()
+	objLayer := globalObjectAPI
 	// Service not initialized yet
-	if objLayer == nil {
+	if objLayer == nil || globalSafeMode {
 		// Respond with 200 OK while server initializes to ensure a distributed cluster
 		// is able to start on orchestration platforms like Docker Swarm.
 		// Refer https://github.com/minio/minio/issues/8140 for more details.

cmd/iam-object-store.go

@@ -47,7 +47,7 @@ func (iamOS *IAMObjectStore) getObjectAPI() ObjectLayer {
 	if iamOS.objAPI != nil {
 		return iamOS.objAPI
 	}
-	return newObjectLayerFn()
+	return globalObjectAPI
 }
 
 func (iamOS *IAMObjectStore) setObjectAPI(objAPI ObjectLayer) {

cmd/iam.go

@@ -406,7 +406,7 @@ func (sys *IAMSys) Init(objAPI ObjectLayer) error {
 
 // DeletePolicy - deletes a canned policy from backend or etcd.
 func (sys *IAMSys) DeletePolicy(policyName string) error {
-	objectAPI := newObjectLayerFn()
+	objectAPI := globalObjectAPI
 	if objectAPI == nil {
 		return errServerNotInitialized
 	}
@@ -431,7 +431,7 @@ func (sys *IAMSys) DeletePolicy(policyName string) error {
 
 // InfoPolicy - expands the canned policy into its JSON structure.
 func (sys *IAMSys) InfoPolicy(policyName string) ([]byte, error) {
-	objectAPI := newObjectLayerFn()
+	objectAPI := globalObjectAPI
 	if objectAPI == nil {
 		return nil, errServerNotInitialized
 	}
@@ -448,7 +448,7 @@ func (sys *IAMSys) InfoPolicy(policyName string) ([]byte, error) {
 
 // ListPolicies - lists all canned policies.
 func (sys *IAMSys) ListPolicies() (map[string][]byte, error) {
-	objectAPI := newObjectLayerFn()
+	objectAPI := globalObjectAPI
 	if objectAPI == nil {
 		return nil, errServerNotInitialized
 	}
@@ -471,7 +471,7 @@ func (sys *IAMSys) ListPolicies() (map[string][]byte, error) {
 
 // SetPolicy - sets a new name policy.
 func (sys *IAMSys) SetPolicy(policyName string, p iampolicy.Policy) error {
-	objectAPI := newObjectLayerFn()
+	objectAPI := globalObjectAPI
 	if objectAPI == nil {
 		return errServerNotInitialized
 	}
@@ -492,7 +492,7 @@ func (sys *IAMSys) SetPolicy(policyName string, p iampolicy.Policy) error {
 
 // DeleteUser - delete user (only for long-term users not STS users).
 func (sys *IAMSys) DeleteUser(accessKey string) error {
-	objectAPI := newObjectLayerFn()
+	objectAPI := globalObjectAPI
 	if objectAPI == nil {
 		return errServerNotInitialized
 	}
@@ -521,7 +521,7 @@ func (sys *IAMSys) DeleteUser(accessKey string) error {
 
 // SetTempUser - set temporary user credentials, these credentials have an expiry.
 func (sys *IAMSys) SetTempUser(accessKey string, cred auth.Credentials, policyName string) error {
-	objectAPI := newObjectLayerFn()
+	objectAPI := globalObjectAPI
 	if objectAPI == nil {
 		return errServerNotInitialized
 	}
@@ -561,7 +561,7 @@ func (sys *IAMSys) SetTempUser(accessKey string, cred auth.Credentials, policyNa
 
 // ListUsers - list all users.
 func (sys *IAMSys) ListUsers() (map[string]madmin.UserInfo, error) {
-	objectAPI := newObjectLayerFn()
+	objectAPI := globalObjectAPI
 	if objectAPI == nil {
 		return nil, errServerNotInitialized
 	}
@@ -587,7 +587,7 @@ func (sys *IAMSys) ListUsers() (map[string]madmin.UserInfo, error) {
 
 // GetUserInfo - get info on a user.
 func (sys *IAMSys) GetUserInfo(name string) (u madmin.UserInfo, err error) {
-	objectAPI := newObjectLayerFn()
+	objectAPI := globalObjectAPI
 	if objectAPI == nil {
 		return u, errServerNotInitialized
 	}
@@ -617,7 +617,7 @@ func (sys *IAMSys) GetUserInfo(name string) (u madmin.UserInfo, err error) {
 
 // SetUserStatus - sets current user status, supports disabled or enabled.
 func (sys *IAMSys) SetUserStatus(accessKey string, status madmin.AccountStatus) error {
-	objectAPI := newObjectLayerFn()
+	objectAPI := globalObjectAPI
 	if objectAPI == nil {
 		return errServerNotInitialized
 	}
@@ -653,7 +653,7 @@ func (sys *IAMSys) SetUserStatus(accessKey string, status madmin.AccountStatus)
 
 // SetUser - set user credentials and policy.
 func (sys *IAMSys) SetUser(accessKey string, uinfo madmin.UserInfo) error {
-	objectAPI := newObjectLayerFn()
+	objectAPI := globalObjectAPI
 	if objectAPI == nil {
 		return errServerNotInitialized
 	}
@@ -685,7 +685,7 @@ func (sys *IAMSys) SetUser(accessKey string, uinfo madmin.UserInfo) error {
 
 // SetUserSecretKey - sets user secret key
 func (sys *IAMSys) SetUserSecretKey(accessKey string, secretKey string) error {
-	objectAPI := newObjectLayerFn()
+	objectAPI := globalObjectAPI
 	if objectAPI == nil {
 		return errServerNotInitialized
 	}
@@ -724,7 +724,7 @@ func (sys *IAMSys) GetUser(accessKey string) (cred auth.Credentials, ok bool) {
 // AddUsersToGroup - adds users to a group, creating the group if
 // needed. No error if user(s) already are in the group.
 func (sys *IAMSys) AddUsersToGroup(group string, members []string) error {
-	objectAPI := newObjectLayerFn()
+	objectAPI := globalObjectAPI
 	if objectAPI == nil {
 		return errServerNotInitialized
 	}
@@ -782,7 +782,7 @@ func (sys *IAMSys) AddUsersToGroup(group string, members []string) error {
 // RemoveUsersFromGroup - remove users from group. If no users are
 // given, and the group is empty, deletes the group as well.
 func (sys *IAMSys) RemoveUsersFromGroup(group string, members []string) error {
-	objectAPI := newObjectLayerFn()
+	objectAPI := globalObjectAPI
 	if objectAPI == nil {
 		return errServerNotInitialized
 	}
@@ -863,7 +863,7 @@ func (sys *IAMSys) RemoveUsersFromGroup(group string, members []string) error {
 
 // SetGroupStatus - enable/disabled a group
 func (sys *IAMSys) SetGroupStatus(group string, enabled bool) error {
-	objectAPI := newObjectLayerFn()
+	objectAPI := globalObjectAPI
 	if objectAPI == nil {
 		return errServerNotInitialized
 	}
@@ -952,7 +952,7 @@ func (sys *IAMSys) ListGroups() (r []string, err error) {
 // PolicyDB. This function applies only long-term users. For STS
 // users, policy is set directly by called sys.policyDBSet().
 func (sys *IAMSys) PolicyDBSet(name, policy string, isGroup bool) error {
-	objectAPI := newObjectLayerFn()
+	objectAPI := globalObjectAPI
 	if objectAPI == nil {
 		return errServerNotInitialized
 	}
@@ -1007,7 +1007,7 @@ func (sys *IAMSys) PolicyDBGet(name string, isGroup bool) ([]string, error) {
 		return nil, errInvalidArgument
 	}
 
-	objectAPI := newObjectLayerFn()
+	objectAPI := globalObjectAPI
 	if objectAPI == nil {
 		return nil, errServerNotInitialized
 	}

cmd/lifecycle.go

@@ -59,7 +59,7 @@ func (sys *LifecycleSys) Get(bucketName string) (lifecycle lifecycle.Lifecycle,
 	if globalIsGateway {
 		// When gateway is enabled, no cached value
 		// is used to validate life cycle policies.
-		objAPI := newObjectLayerFn()
+		objAPI := globalObjectAPI
 		if objAPI == nil {
 			return
 		}

cmd/metrics.go

@@ -83,9 +83,9 @@ func (c *minioCollector) Collect(ch chan<- prometheus.Metric) {
 	minioVersionInfo.WithLabelValues(Version, CommitID).Set(float64(1.0))
 
 	// Fetch disk space info
-	objLayer := newObjectLayerFn()
+	objLayer := globalObjectAPI
 	// Service not initialized yet
-	if objLayer == nil {
+	if objLayer == nil || globalSafeMode {
 		return
 	}
 

cmd/notification.go

@@ -1098,10 +1098,10 @@ func (sys *NotificationSys) NetworkInfo() []madmin.ServerNetworkHardwareInfo {
 }
 
 // NewNotificationSys - creates new notification system object.
-func NewNotificationSys(cfg config.Config, endpoints EndpointList) *NotificationSys {
+func NewNotificationSys(cfg config.Config, endpoints EndpointList) (*NotificationSys, error) {
 	targetList, err := notify.GetNotificationTargets(cfg, GlobalServiceDoneCh, globalRootCAs)
 	if err != nil {
-		logger.FatalIf(err, "Unable to start notification sub system")
+		return nil, config.Errorf("Unable to start notification sub system: %s", err)
 	}
 
 	remoteHosts := getRemoteHosts(endpoints)
@@ -1113,7 +1113,7 @@ func NewNotificationSys(cfg config.Config, endpoints EndpointList) *Notification
 		bucketRulesMap:             make(map[string]event.RulesMap),
 		bucketRemoteTargetRulesMap: make(map[string]map[event.TargetID]event.RulesMap),
 		peerClients:                remoteClients,
-	}
+	}, nil
 }
 
 type eventArgs struct {

cmd/object-api-common.go

@@ -44,7 +44,7 @@ const (
 // Global object layer mutex, used for safely updating object layer.
 var globalObjLayerMutex *sync.RWMutex
 
-// Global object layer, only accessed by newObjectLayerFn().
+// Global object layer, only accessed by globalObjectAPI.
 var globalObjectAPI ObjectLayer
 
 //Global cacheObjects, only accessed by newCacheObjectsFn().

cmd/peer-rest-server.go

@@ -46,8 +46,8 @@ func getServerInfo() (*ServerInfoData, error) {
 		return nil, errServerNotInitialized
 	}
 
-	objLayer := newObjectLayerFn()
+	objLayer := globalObjectAPI
-	if objLayer == nil {
+	if objLayer == nil || globalSafeMode {
 		return nil, errServerNotInitialized
 	}
 
@@ -166,7 +166,7 @@ func (s *peerRESTServer) DeletePolicyHandler(w http.ResponseWriter, r *http.Requ
 		return
 	}
 
-	objAPI := newObjectLayerFn()
+	objAPI := globalObjectAPI
 	if objAPI == nil {
 		s.writeErrorResponse(w, errServerNotInitialized)
 		return
@@ -194,7 +194,7 @@ func (s *peerRESTServer) LoadPolicyHandler(w http.ResponseWriter, r *http.Reques
 		return
 	}
 
-	objAPI := newObjectLayerFn()
+	objAPI := globalObjectAPI
 	if objAPI == nil {
 		s.writeErrorResponse(w, errServerNotInitialized)
 		return
@@ -222,7 +222,7 @@ func (s *peerRESTServer) LoadPolicyMappingHandler(w http.ResponseWriter, r *http
 		return
 	}
 
-	objAPI := newObjectLayerFn()
+	objAPI := globalObjectAPI
 	if objAPI == nil {
 		s.writeErrorResponse(w, errServerNotInitialized)
 		return
@@ -251,7 +251,7 @@ func (s *peerRESTServer) DeleteUserHandler(w http.ResponseWriter, r *http.Reques
 		return
 	}
 
-	objAPI := newObjectLayerFn()
+	objAPI := globalObjectAPI
 	if objAPI == nil {
 		s.writeErrorResponse(w, errServerNotInitialized)
 		return
@@ -279,7 +279,7 @@ func (s *peerRESTServer) LoadUserHandler(w http.ResponseWriter, r *http.Request)
 		return
 	}
 
-	objAPI := newObjectLayerFn()
+	objAPI := globalObjectAPI
 	if objAPI == nil {
 		s.writeErrorResponse(w, errServerNotInitialized)
 		return
@@ -329,7 +329,7 @@ func (s *peerRESTServer) LoadGroupHandler(w http.ResponseWriter, r *http.Request
 		return
 	}
 
-	objAPI := newObjectLayerFn()
+	objAPI := globalObjectAPI
 	if objAPI == nil {
 		s.writeErrorResponse(w, errServerNotInitialized)
 		return
@@ -539,7 +539,7 @@ func (s *peerRESTServer) ReloadFormatHandler(w http.ResponseWriter, r *http.Requ
 		return
 	}
 
-	objAPI := newObjectLayerFn()
+	objAPI := globalObjectAPI
 	if objAPI == nil {
 		s.writeErrorResponse(w, errServerNotInitialized)
 		return

cmd/policy.go

@@ -69,7 +69,7 @@ func (sys *PolicySys) IsAllowed(args policy.Args) bool {
 	if globalIsGateway {
 		// When gateway is enabled, no cached value
 		// is used to validate bucket policies.
-		objAPI := newObjectLayerFn()
+		objAPI := globalObjectAPI
 		if objAPI != nil {
 			config, err := objAPI.GetBucketPolicy(context.Background(), args.BucketName)
 			if err == nil {

cmd/routers.go

@@ -22,17 +22,6 @@ import (
 	"github.com/gorilla/mux"
 )
 
-func newObjectLayerFn() (layer ObjectLayer) {
-	globalObjLayerMutex.RLock()
-	layer = globalObjectAPI
-	globalObjLayerMutex.RUnlock()
-	return
-}
-
-func newCacheObjectsFn() CacheObjectLayer {
-	return globalCacheObjectAPI
-}
-
 // Composed function registering routers for only distributed XL setup.
 func registerDistXLRouters(router *mux.Router, endpoints EndpointList) {
 	// Register storage rpc router only if its a distributed setup.

cmd/server-main.go

@@ -131,11 +131,8 @@ EXAMPLES:
 // Checks if endpoints are either available through environment
 // or command line, returns false if both fails.
 func endpointsPresent(ctx *cli.Context) bool {
-	_, ok := env.Lookup(config.EnvEndpoints)
+	endpoints := env.Get(config.EnvEndpoints, strings.Join(ctx.Args(), config.ValueSeparator))
-	if !ok {
+	return len(endpoints) != 0
-		ok = ctx.Args().Present()
-	}
-	return ok
 }
 
 func serverHandleCmdArgs(ctx *cli.Context) {
@@ -195,6 +192,55 @@ func serverHandleEnvVars() {
 
 }
 
+func initAllSubsystems(newObject ObjectLayer) {
+	// Create a new config system.
+	globalConfigSys = NewConfigSys()
+
+	// Initialize config system.
+	if err := globalConfigSys.Init(newObject); err != nil {
+		logger.Fatal(err, "Unable to initialize config system")
+	}
+
+	// Create new IAM system.
+	globalIAMSys = NewIAMSys()
+
+	if err := globalIAMSys.Init(newObject); err != nil {
+		logger.Fatal(err, "Unable to initialize IAM system")
+	}
+
+	buckets, err := newObject.ListBuckets(context.Background())
+	if err != nil {
+		logger.Fatal(err, "Unable to list buckets")
+	}
+
+	// Create new notification system and initialize notification targets
+	globalNotificationSys, err = NewNotificationSys(globalServerConfig, globalEndpoints)
+	if err != nil {
+		logger.Fatal(err, "Unable to initialize notification targets")
+	}
+
+	// Initialize notification system.
+	if err = globalNotificationSys.Init(buckets, newObject); err != nil {
+		logger.Fatal(err, "Unable to initialize notification system")
+	}
+
+	// Create new policy system.
+	globalPolicySys = NewPolicySys()
+
+	// Initialize policy system.
+	if err = globalPolicySys.Init(buckets, newObject); err != nil {
+		logger.Fatal(err, "Unable to initialize policy system")
+	}
+
+	// Create new lifecycle system.
+	globalLifecycleSys = NewLifecycleSys()
+
+	// Initialize lifecycle system.
+	if err = globalLifecycleSys.Init(buckets, newObject); err != nil {
+		logger.Fatal(err, "Unable to initialize lifecycle system")
+	}
+}
+
 // serverMain handler called for 'minio server' command.
 func serverMain(ctx *cli.Context) {
 	if ctx.Args().First() == "help" || !endpointsPresent(ctx) {
@@ -304,13 +350,8 @@ func serverMain(ctx *cli.Context) {
 	// Re-enable logging
 	logger.Disable = false
 
-	// Create a new config system.
+	// Validate and initialize all subsystems.
-	globalConfigSys = NewConfigSys()
+	initAllSubsystems(newObject)
-
-	// Initialize config system.
-	if err = globalConfigSys.Init(newObject); err != nil {
-		logger.Fatal(err, "Unable to initialize config system")
-	}
 
 	if globalCacheConfig.Enabled {
 		logger.StartupMessage(color.Red(color.Bold("Disk caching is recommended only for gateway deployments")))
@@ -320,46 +361,6 @@ func serverMain(ctx *cli.Context) {
 		logger.FatalIf(err, "Unable to initialize disk caching")
 	}
 
-	// Create new IAM system.
-	globalIAMSys = NewIAMSys()
-	if err = globalIAMSys.Init(newObject); err != nil {
-		logger.Fatal(err, "Unable to initialize IAM system")
-	}
-
-	buckets, err := newObject.ListBuckets(context.Background())
-	if err != nil {
-		logger.Fatal(err, "Unable to list buckets on your backend")
-	}
-
-	// Create new policy system.
-	globalPolicySys = NewPolicySys()
-
-	// Initialize policy system.
-	if err = globalPolicySys.Init(buckets, newObject); err != nil {
-		logger.Fatal(err, "Unable to initialize policy system")
-	}
-
-	// Create new lifecycle system.
-	globalLifecycleSys = NewLifecycleSys()
-
-	// Initialize lifecycle system.
-	if err = globalLifecycleSys.Init(buckets, newObject); err != nil {
-		logger.Fatal(err, "Unable to initialize lifecycle system")
-	}
-
-	// Create new notification system.
-	globalNotificationSys = NewNotificationSys(globalServerConfig, globalEndpoints)
-
-	// Initialize notification system.
-	if err = globalNotificationSys.Init(buckets, newObject); err != nil {
-		logger.Fatal(err, "Unable to initialize notification system")
-	}
-
-	// Verify if object layer supports
-	// - encryption
-	// - compression
-	verifyObjectLayerFeatures("server", newObject)
-
 	initDailyLifecycle()
 
 	if globalIsXL {
@@ -368,9 +369,7 @@ func serverMain(ctx *cli.Context) {
 		initGlobalHeal()
 	}
 
-	globalObjLayerMutex.Lock()
 	globalObjectAPI = newObject
-	globalObjLayerMutex.Unlock()
 
 	// Prints the formatted startup message once object layer is initialized.
 	printStartupMessage(getAPIEndpoints())

cmd/server-startup-msg.go

@@ -50,12 +50,11 @@ func printStartupMessage(apiEndPoints []string) {
 
 	strippedAPIEndpoints := stripStandardPorts(apiEndPoints)
 	// If cache layer is enabled, print cache capacity.
-	cacheObjectAPI := newCacheObjectsFn()
+	if globalCacheObjectAPI != nil {
-	if cacheObjectAPI != nil {
+		printCacheStorageInfo(globalCacheObjectAPI.StorageInfo(context.Background()))
-		printCacheStorageInfo(cacheObjectAPI.StorageInfo(context.Background()))
 	}
 	// Object layer is initialized then print StorageInfo.
-	objAPI := newObjectLayerFn()
+	objAPI := globalObjectAPI
 	if objAPI != nil {
 		printStorageInfo(objAPI.StorageInfo(context.Background()))
 	}
@@ -97,7 +96,7 @@ func stripStandardPorts(apiEndpoints []string) (newAPIEndpoints []string) {
 	newAPIEndpoints = make([]string, len(apiEndpoints))
 	// Check all API endpoints for standard ports and strip them.
 	for i, apiEndpoint := range apiEndpoints {
-		u, err := xnet.ParseURL(apiEndpoint)
+		u, err := xnet.ParseHTTPURL(apiEndpoint)
 		if err != nil {
 			newAPIEndpoints[i] = apiEndpoint
 			continue

cmd/signals.go

@@ -55,7 +55,7 @@ func handleSignals() {
 		// send signal to various go-routines that they need to quit.
 		close(GlobalServiceDoneCh)
 
-		if objAPI := newObjectLayerFn(); objAPI != nil {
+		if objAPI := globalObjectAPI; objAPI != nil {
 			oerr = objAPI.Shutdown(context.Background())
 			logger.LogIf(context.Background(), oerr)
 		}
@@ -66,7 +66,7 @@ func handleSignals() {
 	for {
 		select {
 		case err := <-globalHTTPServerErrorCh:
-			if objAPI := newObjectLayerFn(); objAPI != nil {
+			if objAPI := globalObjectAPI; objAPI != nil {
 				objAPI.Shutdown(context.Background())
 			}
 			if err != nil {

cmd/storage-rest_test.go

@@ -498,7 +498,7 @@ func newStorageRESTHTTPServerClient(t *testing.T) (*httptest.Server, *storageRES
 	router := mux.NewRouter()
 	httpServer := httptest.NewServer(router)
 
-	url, err := xnet.ParseURL(httpServer.URL)
+	url, err := xnet.ParseHTTPURL(httpServer.URL)
 	if err != nil {
 		t.Fatalf("unexpected error %v", err)
 	}

cmd/test-utils_test.go

@@ -370,7 +370,11 @@ func UnstartedTestServer(t TestErrHandler, instanceType string) TestServer {
 	globalPolicySys = NewPolicySys()
 	globalPolicySys.Init(buckets, objLayer)
 
-	globalNotificationSys = NewNotificationSys(globalServerConfig, testServer.Disks)
+	globalNotificationSys, err = NewNotificationSys(globalServerConfig, testServer.Disks)
+	if err != nil {
+		t.Fatalf("Unable to initialize notification system %s", err)
+	}
+
 	globalNotificationSys.Init(buckets, objLayer)
 
 	globalLifecycleSys = NewLifecycleSys()
@@ -1636,7 +1640,10 @@ func newTestObjectLayer(endpoints EndpointList) (newObject ObjectLayer, err erro
 	globalIAMSys.Init(xl)
 
 	globalPolicySys = NewPolicySys()
-	globalNotificationSys = NewNotificationSys(globalServerConfig, endpoints)
+	globalNotificationSys, err = NewNotificationSys(globalServerConfig, endpoints)
+	if err != nil {
+		return xl, err
+	}
 
 	return xl, nil
 }
@@ -2168,8 +2175,18 @@ func registerAPIFunctions(muxRouter *mux.Router, objLayer ObjectLayer, apiFuncti
 	// to underlying cache layer to manage object layer operation and disk caching
 	// operation
 	api := objectAPIHandlers{
-		ObjectAPI:         newObjectLayerFn,
+		ObjectAPI: func() ObjectLayer {
-		CacheAPI:          newCacheObjectsFn,
+			if !globalSafeMode {
+				return globalObjectAPI
+			}
+			return nil
+		},
+		CacheAPI: func() CacheObjectLayer {
+			if !globalSafeMode {
+				return globalCacheObjectAPI
+			}
+			return nil
+		},
 		EncryptionEnabled: func() bool { return true },
 	}
 

cmd/web-router.go

@@ -62,8 +62,18 @@ const specialAssets = "index_bundle.*.js|loader.css|logo.svg|firefox.png|safari.
 func registerWebRouter(router *mux.Router) error {
 	// Initialize Web.
 	web := &webAPIHandlers{
-		ObjectAPI: newObjectLayerFn,
+		ObjectAPI: func() ObjectLayer {
-		CacheAPI:  newCacheObjectsFn,
+			if !globalSafeMode {
+				return globalObjectAPI
+			}
+			return nil
+		},
+		CacheAPI: func() CacheObjectLayer {
+			if !globalSafeMode {
+				return globalCacheObjectAPI
+			}
+			return nil
+		},
 	}
 
 	// Initialize a new json2 codec.

pkg/env/env.go

@@ -3,26 +3,47 @@ package env
 import (
 	"os"
 	"strings"
+	"sync"
 )
 
+var (
+	privateMutex sync.RWMutex
+	envOff       bool
+)
+
+// SetEnvOff - turns off env lookup
+func SetEnvOff() {
+	privateMutex.Lock()
+	defer privateMutex.Unlock()
+
+	envOff = true
+}
+
+// SetEnvOn - turns on env lookup
+func SetEnvOn() {
+	privateMutex.Lock()
+	defer privateMutex.Unlock()
+
+	envOff = false
+}
+
 // Get retrieves the value of the environment variable named
 // by the key. If the variable is present in the environment the
 // value (which may be empty) is returned. Otherwise it returns
 // the specified default value.
 func Get(key, defaultValue string) string {
+	privateMutex.RLock()
+	ok := envOff
+	privateMutex.RUnlock()
+	if ok {
+		return defaultValue
+	}
 	if v, ok := os.LookupEnv(key); ok {
 		return v
 	}
 	return defaultValue
 }
 
-// Lookup retrieves the value of the environment variable named
-// by the key. If the variable is present in the environment the
-// value (which may be empty) is returned and the boolean is true.
-// Otherwise the returned value will be empty and the boolean will
-// be false.
-func Lookup(key string) (string, bool) { return os.LookupEnv(key) }
-
 // List all envs with a given prefix.
 func List(prefix string) (envs []string) {
 	for _, env := range os.Environ() {

pkg/event/target/webhook.go

@@ -98,7 +98,7 @@ func (target *WebhookTarget) Save(eventData event.Event) error {
 	if target.store != nil {
 		return target.store.Put(eventData)
 	}
-	u, pErr := xnet.ParseURL(target.args.Endpoint.String())
+	u, pErr := xnet.ParseHTTPURL(target.args.Endpoint.String())
 	if pErr != nil {
 		return pErr
 	}
@@ -153,7 +153,7 @@ func (target *WebhookTarget) send(eventData event.Event) error {
 
 // Send - reads an event from store and sends it to webhook.
 func (target *WebhookTarget) Send(eventKey string) error {
-	u, pErr := xnet.ParseURL(target.args.Endpoint.String())
+	u, pErr := xnet.ParseHTTPURL(target.args.Endpoint.String())
 	if pErr != nil {
 		return pErr
 	}

pkg/net/url.go

@@ -19,6 +19,7 @@ package net
 import (
 	"encoding/json"
 	"errors"
+	"fmt"
 	"net"
 	"net/http"
 	"net/url"
@@ -103,6 +104,21 @@ func (u URL) DialHTTP() error {
 	return nil
 }
 
+// ParseHTTPURL - parses a string into HTTP URL, string is
+// expected to be of form http:// or https://
+func ParseHTTPURL(s string) (u *URL, err error) {
+	u, err = ParseURL(s)
+	if err != nil {
+		return nil, err
+	}
+	switch u.Scheme {
+	default:
+		return nil, fmt.Errorf("unexpected scheme found %s", u.Scheme)
+	case "http", "https":
+		return u, nil
+	}
+}
+
 // ParseURL - parses string into URL.
 func ParseURL(s string) (u *URL, err error) {
 	var uu *url.URL

pkg/net/url_test.go

@@ -133,6 +133,42 @@ func TestURLUnmarshalJSON(t *testing.T) {
 	}
 }
 
+func TestParseHTTPURL(t *testing.T) {
+	testCases := []struct {
+		s           string
+		expectedURL *URL
+		expectErr   bool
+	}{
+		{"http://play", &URL{Scheme: "http", Host: "play"}, false},
+		{"https://play.min.io:0", &URL{Scheme: "https", Host: "play.min.io:0"}, false},
+		{"https://147.75.201.93:9000/", &URL{Scheme: "https", Host: "147.75.201.93:9000", Path: "/"}, false},
+		{"https://s3.amazonaws.com/?location", &URL{Scheme: "https", Host: "s3.amazonaws.com", Path: "/", RawQuery: "location"}, false},
+		{"http://myminio:10000/mybucket//myobject/", &URL{Scheme: "http", Host: "myminio:10000", Path: "/mybucket/myobject/"}, false},
+		{"ftp://myftp.server:10000/myuser", nil, true},
+		{"https://my.server:10000000/myuser", nil, true},
+		{"myserver:1000", nil, true},
+		{"http://:1000/mybucket", nil, true},
+		{"https://147.75.201.93:90000/", nil, true},
+		{"http:/play", nil, true},
+	}
+
+	for _, testCase := range testCases {
+		testCase := testCase
+		t.Run(testCase.s, func(t *testing.T) {
+			url, err := ParseHTTPURL(testCase.s)
+			expectErr := (err != nil)
+			if expectErr != testCase.expectErr {
+				t.Fatalf("error: expected: %v, got: %v", testCase.expectErr, expectErr)
+			}
+			if !testCase.expectErr {
+				if !reflect.DeepEqual(url, testCase.expectedURL) {
+					t.Fatalf("host: expected: %#v, got: %#v", testCase.expectedURL, url)
+				}
+			}
+		})
+	}
+}
+
 func TestParseURL(t *testing.T) {
 	testCases := []struct {
 		s           string