Add gofumpt to golangci-lint

.golangci.yaml

@@ -4,5 +4,5 @@ run:
 linters:
   disable-all: true
   enable:
-    - gofmt
+    - gofumpt
     - goimports

fakestorage/config.go

@@ -6,7 +6,6 @@ import (
 )
 
 func (s *Server) updateServerConfig(r *http.Request) jsonResponse {
-
 	var configOptions struct {
 		ExternalUrl string `json:"externalUrl,omitempty"`
 		PublicHost  string `json:"publicHost,omitempty"`

fakestorage/server.go

@@ -345,7 +345,6 @@ func (s *Server) handleBatchCall(w http.ResponseWriter, r *http.Request) {
 		partHeaders.Set("Content-Type", "application/http")
 		partHeaders.Set("Content-ID", strings.Replace(contentID, "<", "<response-", 1))
 		partWriter, err := mw.CreatePart(partHeaders)
-
 		if err != nil {
 			continue
 		}

fakestorage/server_test.go

@@ -89,7 +89,7 @@ func TestNewServerLogging(t *testing.T) {
 
 func TestPublicURL(t *testing.T) {
 	t.Parallel()
-	var tests = []struct {
+	tests := []struct {
 		name     string
 		options  Options
 		expected string
@@ -858,7 +858,7 @@ func (m *fakeEventManager) Trigger(o *backend.Object, eventType notification.Eve
 }
 
 func runServersTest(t *testing.T, objs []Object, fn func(*testing.T, *Server)) {
-	var testScenarios = []struct {
+	testScenarios := []struct {
 		name    string
 		options Options
 	}{

internal/backend/storage.go

@@ -26,5 +26,7 @@ type Error string
 
 func (e Error) Error() string { return string(e) }
 
-const BucketNotFound = Error("bucket not found")
-const BucketNotEmpty = Error("bucket must be empty prior to deletion")
+const (
+	BucketNotFound = Error("bucket not found")
+	BucketNotEmpty = Error("bucket must be empty prior to deletion")
+)