Use errors.Is(...) instead of os.Is...() in migrate.go: golang/go#41122

migrate.go

@@ -487,7 +487,7 @@ func (m *Migrate) read(from int, to int, ret chan<- interface{}) {
 			}
 
 			prev, err := m.sourceDrv.Prev(suint(from))
-			if os.IsNotExist(err) && to == -1 {
+			if errors.Is(err, os.ErrNotExist) && to == -1 {
 				// apply nil migration
 				migr, err := m.newMigration(suint(from), -1)
 				if err != nil {
@@ -580,7 +580,7 @@ func (m *Migrate) readUp(from int, limit int, ret chan<- interface{}) {
 
 		// apply next migration
 		next, err := m.sourceDrv.Next(suint(from))
-		if os.IsNotExist(err) {
+		if errors.Is(err, os.ErrNotExist) {
 			// no limit, but no migrations applied?
 			if limit == -1 && count == 0 {
 				ret <- ErrNoChange
@@ -666,7 +666,7 @@ func (m *Migrate) readDown(from int, limit int, ret chan<- interface{}) {
 		}
 
 		prev, err := m.sourceDrv.Prev(suint(from))
-		if os.IsNotExist(err) {
+		if errors.Is(err, os.ErrNotExist) {
 			// no limit or haven't reached limit, apply "first" migration
 			if limit == -1 || limit-count > 0 {
 				firstVersion, err := m.sourceDrv.First()
@@ -785,9 +785,9 @@ func (m *Migrate) versionExists(version uint) (result error) {
 			}
 		}()
 	}
-	if os.IsExist(err) {
+	if errors.Is(err, os.ErrExist) {
 		return nil
-	} else if !os.IsNotExist(err) {
+	} else if !errors.Is(err, os.ErrNotExist) {
 		return err
 	}
 
@@ -800,9 +800,9 @@ func (m *Migrate) versionExists(version uint) (result error) {
 			}
 		}()
 	}
-	if os.IsExist(err) {
+	if errors.Is(err, os.ErrExist) {
 		return nil
-	} else if !os.IsNotExist(err) {
+	} else if !errors.Is(err, os.ErrNotExist) {
 		return err
 	}
 
@@ -836,7 +836,7 @@ func (m *Migrate) newMigration(version uint, targetVersion int) (*Migration, err
 
 	if targetVersion >= int(version) {
 		r, identifier, err := m.sourceDrv.ReadUp(version)
-		if os.IsNotExist(err) {
+		if errors.Is(err, os.ErrNotExist) {
 			// create "empty" migration
 			migr, err = NewMigration(nil, "", version, targetVersion)
 			if err != nil {
@@ -856,7 +856,7 @@ func (m *Migrate) newMigration(version uint, targetVersion int) (*Migration, err
 
 	} else {
 		r, identifier, err := m.sourceDrv.ReadDown(version)
-		if os.IsNotExist(err) {
+		if errors.Is(err, os.ErrNotExist) {
 			// create "empty" migration
 			migr, err = NewMigration(nil, "", version, targetVersion)
 			if err != nil {