change os.ISNotExist to use updated call

cmd/root.go

@@ -13,8 +13,10 @@ import (
 	"encoding/binary"
 	"encoding/hex"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"gitlab.com/elixxir/client/cmix"
+	"io/fs"
 	"io/ioutil"
 	"log"
 	"os"
@@ -536,7 +538,7 @@ func createClient() *api.Client {
 	backupPass := []byte(viper.GetString("backupPass"))
 
 	// create a new client if none exist
-	if _, err := os.Stat(storeDir); os.IsNotExist(err) {
+	if _, err := os.Stat(storeDir); errors.Is(err, fs.ErrNotExist) {
 		// Load NDF
 		ndfJSON, err := ioutil.ReadFile(viper.GetString("ndf"))
 		if err != nil {

cmix/identity/tracker.go

@@ -11,7 +11,7 @@ import (
 	"encoding/json"
 	"github.com/pkg/errors"
 	"io"
-	"os"
+	"io/fs"
 	"sync"
 	"time"
 
@@ -85,7 +85,7 @@ func NewOrLoadTracker(session storage.Session, addrSpace address.Space) *manager
 
 	// Load this structure
 	err := t.load()
-	if err != nil && os.IsNotExist(err) {
+	if err != nil && errors.Is(err, fs.ErrNotExist) {
 		oldTimestamp, err2 := getOldTimestampStore(t.session)
 		if err2 == nil {
 			jww.WARN.Printf("No tracked identities found, creating a new " +

e2e/manager.go

@@ -2,7 +2,6 @@ package e2e
 
 import (
 	"encoding/json"
-	"fmt"
 	"strings"
 	"time"
 
@@ -95,7 +94,6 @@ func LoadLegacy(kv *versioned.KV, net cmix.Client, myID *id.ID,
 	// this would be a case where LoadLegacy is most likely not the correct
 	// code-path the caller should be following.
 	if _, err := kv.Get(e2eRekeyParamsKey, e2eRekeyParamsVer); err != nil && !strings.Contains(err.Error(), "object not found") {
-		fmt.Printf("err: %v", err)
 		return nil, errors.New("E2E rekey params are already on disk, " +
 			"LoadLegacy should not be called")
 	}

e2e/parse/conversation/partner.go

@@ -14,8 +14,8 @@ import (
 	"gitlab.com/elixxir/client/storage/versioned"
 	"gitlab.com/xx_network/primitives/id"
 	"gitlab.com/xx_network/primitives/netTime"
+	"io/fs"
 	"math"
-	"os"
 	"strings"
 	"sync"
 )
@@ -51,7 +51,7 @@ type conversationDisk struct {
 // saved to KV, and returned.
 func LoadOrMakeConversation(kv *versioned.KV, partner *id.ID) *Conversation {
 	c, err := loadConversation(kv, partner)
-	if err != nil && !(os.IsNotExist(err) || strings.Contains(err.Error(), "object not found")) {
+	if err != nil && !(errors.Is(err, fs.ErrNotExist) || strings.Contains(err.Error(), "object not found")) {
 		jww.FATAL.Panicf("Failed to load conversation from storage: %+v", err)
 	} else if c == nil {
 		// Create new conversation and save to KV if one does not exist

storage/ud/store.go

@@ -8,6 +8,7 @@ import (
 	"gitlab.com/elixxir/client/storage/versioned"
 	"gitlab.com/elixxir/primitives/fact"
 	"gitlab.com/xx_network/primitives/netTime"
+	"io/fs"
 	"strings"
 )
 
@@ -113,7 +114,7 @@ func NewOrLoadStore(kv *versioned.KV) (*Store, error) {
 
 	if err := s.load(); err != nil {
 		if strings.Contains(err.Error(), "object not found") ||
-			strings.Contains(err.Error(), "no such file or directory") {
+			errors.Is(err, fs.ErrNotExist) {
 			return s, s.save()
 		}
 	}