diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ae866df9..337f1e81 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -9,7 +9,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     env:
-      DOCKER_BUILDTAGS: "include_oss include_gcs"
+      BUILDTAGS: "include_oss,include_gcs"
       CGO_ENABLED: 1
       GO111MODULE: "auto"
       GOPATH: ${{ github.workspace }}
diff --git a/BUILDING.md b/BUILDING.md
index 2981d016..4c43b03c 100644
--- a/BUILDING.md
+++ b/BUILDING.md
@@ -114,4 +114,4 @@ the registry binary generated in the "./bin" directory:
 ### Optional build tags
 
 Optional [build tags](http://golang.org/pkg/go/build/) can be provided using
-the environment variable `DOCKER_BUILDTAGS`.
+the environment variable `BUILDTAGS`.
diff --git a/Dockerfile b/Dockerfile
index d6c19395..42b87c06 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -22,12 +22,12 @@ RUN --mount=target=. \
 FROM base AS build
 ARG TARGETPLATFORM
 ARG LDFLAGS="-s -w"
-ARG BUILDTAGS="include_oss include_gcs"
+ARG BUILDTAGS="include_oss,include_gcs"
 RUN --mount=type=bind,target=/go/src/github.com/docker/distribution,rw \
     --mount=type=cache,target=/root/.cache/go-build \
     --mount=target=/go/pkg/mod,type=cache \
     --mount=type=bind,source=/tmp/.ldflags,target=/tmp/.ldflags,from=version \
-      set -x ; xx-go build -trimpath -ldflags "$(cat /tmp/.ldflags) ${LDFLAGS}" -tags="${BUILDTAGS}" -o /usr/bin/registry ./cmd/registry \
+      set -x ; xx-go build -tags "${BUILDTAGS}" -trimpath -ldflags "$(cat /tmp/.ldflags) ${LDFLAGS}" -o /usr/bin/registry ./cmd/registry \
       && xx-verify --static /usr/bin/registry
 
 FROM scratch AS binary
diff --git a/Makefile b/Makefile
index 75e11820..660ad5c7 100644
--- a/Makefile
+++ b/Makefile
@@ -5,7 +5,6 @@ ROOTDIR=$(dir $(abspath $(lastword $(MAKEFILE_LIST))))
 VERSION=$(shell git describe --match 'v[0-9]*' --dirty='.m' --always)
 REVISION=$(shell git rev-parse HEAD)$(shell if ! git diff --no-ext-diff --quiet --exit-code; then echo .m; fi)
 
-
 PKG=github.com/docker/distribution
 
 # Project packages.
@@ -50,7 +49,7 @@ version/version.go:
 
 check: ## run all linters (TODO: enable "unused", "varcheck", "ineffassign", "unconvert", "staticheck", "goimports", "structcheck")
 	@echo "$(WHALE) $@"
-	@GO111MODULE=off golangci-lint run
+	@GO111MODULE=off golangci-lint --build-tags "${BUILDTAGS}" run
 
 test: ## run tests, except integration test with test.short
 	@echo "$(WHALE) $@"
diff --git a/registry/storage/driver/gcs/gcs.go b/registry/storage/driver/gcs/gcs.go
index 66d0d1ad..e504ffc4 100644
--- a/registry/storage/driver/gcs/gcs.go
+++ b/registry/storage/driver/gcs/gcs.go
@@ -1,18 +1,17 @@
+//go:build include_gcs
+// +build include_gcs
+
 // Package gcs provides a storagedriver.StorageDriver implementation to
 // store blobs in Google cloud storage.
 //
 // This package leverages the google.golang.org/cloud/storage client library
-//for interfacing with gcs.
+// for interfacing with gcs.
 //
 // Because gcs is a key, value store the Stat call does not support last modification
 // time for directories (directories are an abstraction for key, value stores)
 //
 // Note that the contents of incomplete uploads are not accessible even though
 // Stat returns their length
-//
-//go:build include_gcs
-// +build include_gcs
-
 package gcs
 
 import (
@@ -62,7 +61,6 @@ var rangeHeader = regexp.MustCompile(`^bytes=([0-9])+-([0-9]+)$`)
 // driverParameters is a struct that encapsulates all of the driver parameters after all values have been set
 type driverParameters struct {
 	bucket        string
-	config        *jwt.Config
 	email         string
 	privateKey    []byte
 	client        *http.Client
@@ -88,6 +86,8 @@ func (factory *gcsDriverFactory) Create(parameters map[string]interface{}) (stor
 	return FromParameters(parameters)
 }
 
+var _ storagedriver.StorageDriver = &driver{}
+
 // driver is a storagedriver.StorageDriver implementation backed by GCS
 // Objects are stored at absolute keys in the provided bucket.
 type driver struct {
@@ -298,7 +298,7 @@ func (d *driver) Reader(context context.Context, path string, offset int64) (io.
 				if err != nil {
 					return nil, err
 				}
-				if offset == int64(obj.Size) {
+				if offset == obj.Size {
 					return ioutil.NopCloser(bytes.NewReader([]byte{})), nil
 				}
 				return nil, storagedriver.InvalidOffsetError{Path: path, Offset: offset}
@@ -614,10 +614,10 @@ func (d *driver) Stat(context context.Context, path string) (storagedriver.FileI
 	//try to get as folder
 	dirpath := d.pathToDirKey(path)
 
-	var query *storage.Query
-	query = &storage.Query{}
-	query.Prefix = dirpath
-	query.MaxResults = 1
+	query := &storage.Query{
+		Prefix:     dirpath,
+		MaxResults: 1,
+	}
 
 	objects, err := storageListObjects(gcsContext, d.bucket, query)
 	if err != nil {
@@ -639,7 +639,7 @@ func (d *driver) Stat(context context.Context, path string) (storagedriver.FileI
 }
 
 // List returns a list of the objects that are direct descendants of the
-//given path.
+// given path.
 func (d *driver) List(context context.Context, path string) ([]string, error) {
 	var query *storage.Query
 	query = &storage.Query{}
diff --git a/registry/storage/driver/gcs/gcs_test.go b/registry/storage/driver/gcs/gcs_test.go
index 4ae9aa3f..ee4a67a8 100644
--- a/registry/storage/driver/gcs/gcs_test.go
+++ b/registry/storage/driver/gcs/gcs_test.go
@@ -59,7 +59,7 @@ func init() {
 			panic(fmt.Sprintf("Error reading JWT config : %s", err))
 		}
 		email = jwtConfig.Email
-		privateKey = []byte(jwtConfig.PrivateKey)
+		privateKey = jwtConfig.PrivateKey
 		if len(privateKey) == 0 {
 			panic("Error reading JWT config : missing private_key property")
 		}
@@ -260,6 +260,9 @@ func TestEmptyRootList(t *testing.T) {
 		}
 	}()
 	keys, err := emptyRootDriver.List(ctx, "/")
+	if err != nil {
+		t.Fatalf("unexpected error listing empty root content: %v", err)
+	}
 	for _, path := range keys {
 		if !storagedriver.PathRegexp.MatchString(path) {
 			t.Fatalf("unexpected string in path: %q != %q", path, storagedriver.PathRegexp)
@@ -267,6 +270,9 @@ func TestEmptyRootList(t *testing.T) {
 	}
 
 	keys, err = slashRootDriver.List(ctx, "/")
+	if err != nil {
+		t.Fatalf("unexpected error listing slash root content: %v", err)
+	}
 	for _, path := range keys {
 		if !storagedriver.PathRegexp.MatchString(path) {
 			t.Fatalf("unexpected string in path: %q != %q", path, storagedriver.PathRegexp)
diff --git a/registry/storage/driver/oss/oss.go b/registry/storage/driver/oss/oss.go
index 8738b1e0..dfe6fd96 100644
--- a/registry/storage/driver/oss/oss.go
+++ b/registry/storage/driver/oss/oss.go
@@ -1,3 +1,6 @@
+//go:build include_oss
+// +build include_oss
+
 // Package oss provides a storagedriver.StorageDriver implementation to
 // store blobs in Aliyun OSS cloud storage.
 //
@@ -6,10 +9,6 @@
 //
 // Because OSS is a key, value store the Stat call does not support last modification
 // time for directories (directories are an abstraction for key, value stores)
-//
-//go:build include_oss
-// +build include_oss
-
 package oss
 
 import (
@@ -38,12 +37,11 @@ const driverName = "oss"
 const minChunkSize = 5 << 20
 
 const defaultChunkSize = 2 * minChunkSize
-const defaultTimeout = 2 * time.Minute // 2 minute timeout per chunk
 
 // listMax is the largest amount of objects you can request from OSS in a list call
 const listMax = 1000
 
-//DriverParameters A struct that encapsulates all of the driver parameters after all values have been set
+// DriverParameters A struct that encapsulates all of the driver parameters after all values have been set
 type DriverParameters struct {
 	AccessKeyID     string
 	AccessKeySecret string
@@ -68,6 +66,8 @@ func (factory *ossDriverFactory) Create(parameters map[string]interface{}) (stor
 	return FromParameters(parameters)
 }
 
+var _ storagedriver.StorageDriver = &driver{}
+
 type driver struct {
 	Client        *oss.Client
 	Bucket        *oss.Bucket
@@ -498,11 +498,6 @@ func parseError(path string, err error) error {
 	return err
 }
 
-func hasCode(err error, code string) bool {
-	ossErr, ok := err.(*oss.Error)
-	return ok && ossErr.Code == code
-}
-
 func (d *driver) getOptions() oss.Options {
 	return oss.Options{ServerSideEncryption: d.Encrypt}
 }
diff --git a/registry/storage/driver/oss/oss_test.go b/registry/storage/driver/oss/oss_test.go
index e042bb75..aedca987 100644
--- a/registry/storage/driver/oss/oss_test.go
+++ b/registry/storage/driver/oss/oss_test.go
@@ -128,6 +128,9 @@ func TestEmptyRootList(t *testing.T) {
 	defer rootedDriver.Delete(ctx, filename)
 
 	keys, err := emptyRootDriver.List(ctx, "/")
+	if err != nil {
+		t.Fatalf("unexpected error listing empty root content: %v", err)
+	}
 	for _, path := range keys {
 		if !storagedriver.PathRegexp.MatchString(path) {
 			t.Fatalf("unexpected string in path: %q != %q", path, storagedriver.PathRegexp)
@@ -135,6 +138,9 @@ func TestEmptyRootList(t *testing.T) {
 	}
 
 	keys, err = slashRootDriver.List(ctx, "/")
+	if err != nil {
+		t.Fatalf("unexpected error listing slash root content: %v", err)
+	}
 	for _, path := range keys {
 		if !storagedriver.PathRegexp.MatchString(path) {
 			t.Fatalf("unexpected string in path: %q != %q", path, storagedriver.PathRegexp)
diff --git a/registry/storage/driver/s3-aws/s3.go b/registry/storage/driver/s3-aws/s3.go
index 77b821f8..5f2dd753 100644
--- a/registry/storage/driver/s3-aws/s3.go
+++ b/registry/storage/driver/s3-aws/s3.go
@@ -137,6 +137,8 @@ func (factory *s3DriverFactory) Create(parameters map[string]interface{}) (stora
 	return FromParameters(parameters)
 }
 
+var _ storagedriver.StorageDriver = &driver{}
+
 type driver struct {
 	S3                          *s3.S3
 	Bucket                      string