Merge pull request #2662 from dmcgowan/enable-structcheck

Enable static checks

.gometalinter.json

@@ -4,6 +4,10 @@
   "Sort": ["linter", "severity", "path", "line"],
   "EnableGC": true,
   "Enable": [
+    "structcheck",
+    "staticcheck",
+    "unconvert",
+
     "gofmt",
     "goimports",
     "golint",

digestset/set_test.go

@@ -41,7 +41,7 @@ func TestLookup(t *testing.T) {
 	}
 	assertEqualDigests(t, dgst, digests[3])
 
-	dgst, err = dset.Lookup("1234")
+	_, err = dset.Lookup("1234")
 	if err == nil {
 		t.Fatal("Expected ambiguous error looking up: 1234")
 	}
@@ -49,7 +49,7 @@ func TestLookup(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	dgst, err = dset.Lookup("9876")
+	_, err = dset.Lookup("9876")
 	if err == nil {
 		t.Fatal("Expected not found error looking up: 9876")
 	}
@@ -57,7 +57,7 @@ func TestLookup(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	dgst, err = dset.Lookup("sha256:1234")
+	_, err = dset.Lookup("sha256:1234")
 	if err == nil {
 		t.Fatal("Expected ambiguous error looking up: sha256:1234")
 	}

health/health.go

@@ -215,7 +215,7 @@ func RegisterFunc(name string, check func() error) {
 // RegisterPeriodicFunc allows the convenience of registering a PeriodicChecker
 // from an arbitrary func() error.
 func (registry *Registry) RegisterPeriodicFunc(name string, period time.Duration, check CheckFunc) {
-	registry.Register(name, PeriodicChecker(CheckFunc(check), period))
+	registry.Register(name, PeriodicChecker(check, period))
 }
 
 // RegisterPeriodicFunc allows the convenience of registering a PeriodicChecker
@@ -227,7 +227,7 @@ func RegisterPeriodicFunc(name string, period time.Duration, check CheckFunc) {
 // RegisterPeriodicThresholdFunc allows the convenience of registering a
 // PeriodicChecker from an arbitrary func() error.
 func (registry *Registry) RegisterPeriodicThresholdFunc(name string, period time.Duration, threshold int, check CheckFunc) {
-	registry.Register(name, PeriodicThresholdChecker(CheckFunc(check), period, threshold))
+	registry.Register(name, PeriodicThresholdChecker(check, period, threshold))
 }
 
 // RegisterPeriodicThresholdFunc allows the convenience of registering a

manifest/schema1/config_builder_test.go

@@ -59,7 +59,7 @@ func TestEmptyTar(t *testing.T) {
 	if err != nil {
 		t.Fatalf("NewReader returned error: %v", err)
 	}
-	n, err := gzipReader.Read(decompressed[:])
+	n, _ := gzipReader.Read(decompressed[:])
 	if n != 1024 {
 		t.Fatalf("read returned %d bytes; expected 1024", n)
 	}

manifest/schema2/manifest_test.go

@@ -56,7 +56,7 @@ func TestManifest(t *testing.T) {
 		t.Fatalf("error creating DeserializedManifest: %v", err)
 	}
 
-	mediaType, canonical, err := deserialized.Payload()
+	mediaType, canonical, _ := deserialized.Payload()
 
 	if mediaType != MediaTypeManifest {
 		t.Fatalf("unexpected media type: %s", mediaType)

notifications/sinks_test.go

@@ -31,7 +31,7 @@ func TestBroadcaster(t *testing.T) {
 			wg.Add(1)
 			go func(block ...Event) {
 				if err := b.Write(block...); err != nil {
-					t.Fatalf("error writing block of length %d: %v", len(block), err)
+					t.Errorf("error writing block of length %d: %v", len(block), err)
 				}
 				wg.Done()
 			}(block...)
@@ -41,6 +41,9 @@ func TestBroadcaster(t *testing.T) {
 	}
 
 	wg.Wait() // Wait until writes complete
+	if t.Failed() {
+		t.FailNow()
+	}
 	checkClose(t, b)
 
 	// Iterate through the sinks and check that they all have the expected length.
@@ -79,7 +82,7 @@ func TestEventQueue(t *testing.T) {
 			wg.Add(1)
 			go func(block ...Event) {
 				if err := eq.Write(block...); err != nil {
-					t.Fatalf("error writing event block: %v", err)
+					t.Errorf("error writing event block: %v", err)
 				}
 				wg.Done()
 			}(block...)
@@ -89,6 +92,9 @@ func TestEventQueue(t *testing.T) {
 	}
 
 	wg.Wait()
+	if t.Failed() {
+		t.FailNow()
+	}
 	checkClose(t, eq)
 
 	ts.mu.Lock()
@@ -177,7 +183,7 @@ func TestRetryingSink(t *testing.T) {
 			go func(block ...Event) {
 				defer wg.Done()
 				if err := s.Write(block...); err != nil {
-					t.Fatalf("error writing event block: %v", err)
+					t.Errorf("error writing event block: %v", err)
 				}
 			}(block...)
 
@@ -186,6 +192,9 @@ func TestRetryingSink(t *testing.T) {
 	}
 
 	wg.Wait()
+	if t.Failed() {
+		t.FailNow()
+	}
 	checkClose(t, s)
 
 	ts.mu.Lock()

registry/api/v2/routes.go

@@ -14,15 +14,6 @@ const (
 	RouteNameCatalog         = "catalog"
 )
 
-var allEndpoints = []string{
-	RouteNameManifest,
-	RouteNameCatalog,
-	RouteNameTags,
-	RouteNameBlob,
-	RouteNameBlobUpload,
-	RouteNameBlobUploadChunk,
-}
-
 // Router builds a gorilla router with named routes for the various API
 // methods. This can be used directly by both server implementations and
 // clients.

registry/auth/htpasswd/htpasswd.go

@@ -38,7 +38,7 @@ func (htpasswd *htpasswd) authenticateUser(username string, password string) err
 		return auth.ErrAuthenticationFailure
 	}
 
-	err := bcrypt.CompareHashAndPassword([]byte(credentials), []byte(password))
+	err := bcrypt.CompareHashAndPassword(credentials, []byte(password))
 	if err != nil {
 		return auth.ErrAuthenticationFailure
 	}

registry/client/auth/session.go

@@ -68,7 +68,6 @@ func NewAuthorizer(manager challenge.Manager, handlers ...AuthenticationHandler)
 type endpointAuthorizer struct {
 	challenges challenge.Manager
 	handlers   []AuthenticationHandler
-	transport  http.RoundTripper
 }
 
 func (ea *endpointAuthorizer) ModifyRequest(req *http.Request) error {
@@ -121,7 +120,6 @@ type clock interface {
 }
 
 type tokenHandler struct {
-	header    http.Header
 	creds     CredentialStore
 	transport http.RoundTripper
 	clock     clock

registry/client/repository.go

@@ -83,7 +83,6 @@ func NewRegistry(baseURL string, transport http.RoundTripper) (Registry, error)
 type registry struct {
 	client *http.Client
 	ub     *v2.URLBuilder
-	context context.Context
 }
 
 // Repositories returns a lexigraphically sorted catalog given a base URL.  The 'entries' slice will be filled up to the size
@@ -154,7 +153,6 @@ func NewRepository(name reference.Named, baseURL string, transport http.RoundTri
 type repository struct {
 	client *http.Client
 	ub     *v2.URLBuilder
-	context context.Context
 	name   reference.Named
 }
 

registry/client/transport/http_reader.go

@@ -5,7 +5,6 @@ import (
 	"fmt"
 	"io"
 	"net/http"
-	"os"
 	"regexp"
 	"strconv"
 )
@@ -97,7 +96,7 @@ func (hrs *httpReadSeeker) Seek(offset int64, whence int) (int64, error) {
 
 	lastReaderOffset := hrs.readerOffset
 
-	if whence == os.SEEK_SET && hrs.rc == nil {
+	if whence == io.SeekStart && hrs.rc == nil {
 		// If no request has been made yet, and we are seeking to an
 		// absolute position, set the read offset as well to avoid an
 		// unnecessary request.
@@ -113,14 +112,14 @@ func (hrs *httpReadSeeker) Seek(offset int64, whence int) (int64, error) {
 	newOffset := hrs.seekOffset
 
 	switch whence {
-	case os.SEEK_CUR:
+	case io.SeekCurrent:
 		newOffset += offset
-	case os.SEEK_END:
+	case io.SeekEnd:
 		if hrs.size < 0 {
 			return 0, errors.New("content length not known")
 		}
 		newOffset = hrs.size + offset
-	case os.SEEK_SET:
+	case io.SeekStart:
 		newOffset = offset
 	}
 

registry/handlers/api_test.go

@@ -512,8 +512,8 @@ func testBlobAPI(t *testing.T, env *testEnv, args blobArgs) *testEnv {
 
 	// ------------------------------------------
 	// Now, actually do successful upload.
-	layerLength, _ := layerFile.Seek(0, os.SEEK_END)
+	layerLength, _ := layerFile.Seek(0, io.SeekEnd)
-	layerFile.Seek(0, os.SEEK_SET)
+	layerFile.Seek(0, io.SeekStart)
 
 	uploadURLBase, _ = startPushLayer(t, env, imageName)
 	pushLayer(t, env.builder, imageName, layerDigest, uploadURLBase, layerFile)
@@ -674,12 +674,12 @@ func testBlobDelete(t *testing.T, env *testEnv, args blobArgs) {
 
 	// ----------------
 	// Reupload previously deleted blob
-	layerFile.Seek(0, os.SEEK_SET)
+	layerFile.Seek(0, io.SeekStart)
 
 	uploadURLBase, _ := startPushLayer(t, env, imageName)
 	pushLayer(t, env.builder, imageName, layerDigest, uploadURLBase, layerFile)
 
-	layerFile.Seek(0, os.SEEK_SET)
+	layerFile.Seek(0, io.SeekStart)
 	canonicalDigester := digest.Canonical.Digester()
 	if _, err := io.Copy(canonicalDigester.Hash(), layerFile); err != nil {
 		t.Fatalf("error copying to digest: %v", err)
@@ -693,7 +693,7 @@ func testBlobDelete(t *testing.T, env *testEnv, args blobArgs) {
 		t.Fatalf("unexpected error checking head on existing layer: %v", err)
 	}
 
-	layerLength, _ := layerFile.Seek(0, os.SEEK_END)
+	layerLength, _ := layerFile.Seek(0, io.SeekEnd)
 	checkResponse(t, "checking head on reuploaded layer", resp, http.StatusOK)
 	checkHeaders(t, resp, http.Header{
 		"Content-Length":        []string{fmt.Sprint(layerLength)},

registry/handlers/mail.go

@@ -36,7 +36,7 @@ func (mail *mailer) sendMail(subject, message string) error {
 		auth,
 		mail.From,
 		mail.To,
-		[]byte(msg),
+		msg,
 	)
 	if err != nil {
 		return err

registry/proxy/proxyblobstore.go

@@ -16,7 +16,7 @@ import (
 )
 
 // todo(richardscothern): from cache control header or config file
-const blobTTL = time.Duration(24 * 7 * time.Hour)
+const blobTTL = 24 * 7 * time.Hour
 
 type proxyBlobStore struct {
 	localStore     distribution.BlobStore

registry/proxy/proxyblobstore_test.go

@@ -350,24 +350,30 @@ func testProxyStoreServe(t *testing.T, te *testEnv, numClients int) {
 				w := httptest.NewRecorder()
 				r, err := http.NewRequest("GET", "", nil)
 				if err != nil {
-					t.Fatal(err)
+					t.Error(err)
+					return
 				}
 
 				err = te.store.ServeBlob(te.ctx, w, r, remoteBlob.Digest)
 				if err != nil {
-					t.Fatalf(err.Error())
+					t.Errorf(err.Error())
+					return
 				}
 
 				bodyBytes := w.Body.Bytes()
 				localDigest := digest.FromBytes(bodyBytes)
 				if localDigest != remoteBlob.Digest {
-					t.Fatalf("Mismatching blob fetch from proxy")
+					t.Errorf("Mismatching blob fetch from proxy")
+					return
 				}
 			}
 		}()
 	}
 
 	wg.Wait()
+	if t.Failed() {
+		t.FailNow()
+	}
 
 	remoteBlobCount := len(te.inRemote)
 	sbsMu.Lock()
@@ -404,7 +410,6 @@ func testProxyStoreServe(t *testing.T, te *testEnv, numClients int) {
 		}
 	}
 
-	localStats = te.LocalStats()
 	remoteStats = te.RemoteStats()
 
 	// Ensure remote unchanged

registry/proxy/proxymanifeststore.go

@@ -12,7 +12,7 @@ import (
 )
 
 // todo(richardscothern): from cache control header or config
-const repositoryTTL = time.Duration(24 * 7 * time.Hour)
+const repositoryTTL = 24 * 7 * time.Hour
 
 type proxyManifestStore struct {
 	ctx             context.Context

registry/storage/blob_test.go

@@ -7,7 +7,6 @@ import (
 	"fmt"
 	"io"
 	"io/ioutil"
-	"os"
 	"path"
 	"reflect"
 	"testing"
@@ -96,7 +95,7 @@ func TestSimpleBlobUpload(t *testing.T) {
 	}
 
 	// Do a resume, get unknown upload
-	blobUpload, err = bs.Resume(ctx, blobUpload.ID())
+	_, err = bs.Resume(ctx, blobUpload.ID())
 	if err != distribution.ErrBlobUploadUnknown {
 		t.Fatalf("unexpected error resuming upload, should be unknown: %v", err)
 	}
@@ -278,7 +277,7 @@ func TestSimpleBlobRead(t *testing.T) {
 		t.Fatalf("expected not found error when testing for existence: %v", err)
 	}
 
-	rc, err := bs.Open(ctx, dgst)
+	_, err = bs.Open(ctx, dgst)
 	if err != distribution.ErrBlobUnknown {
 		t.Fatalf("expected not found error when opening non-existent blob: %v", err)
 	}
@@ -300,7 +299,7 @@ func TestSimpleBlobRead(t *testing.T) {
 		t.Fatalf("committed blob has incorrect length: %v != %v", desc.Size, randomLayerSize)
 	}
 
-	rc, err = bs.Open(ctx, desc.Digest) // note that we are opening with original digest.
+	rc, err := bs.Open(ctx, desc.Digest) // note that we are opening with original digest.
 	if err != nil {
 		t.Fatalf("error opening blob with %v: %v", dgst, err)
 	}
@@ -323,7 +322,7 @@ func TestSimpleBlobRead(t *testing.T) {
 	}
 
 	// Now seek back the blob, read the whole thing and check against randomLayerData
-	offset, err := rc.Seek(0, os.SEEK_SET)
+	offset, err := rc.Seek(0, io.SeekStart)
 	if err != nil {
 		t.Fatalf("error seeking blob: %v", err)
 	}
@@ -342,7 +341,7 @@ func TestSimpleBlobRead(t *testing.T) {
 	}
 
 	// Reset the randomLayerReader and read back the buffer
-	_, err = randomLayerReader.Seek(0, os.SEEK_SET)
+	_, err = randomLayerReader.Seek(0, io.SeekStart)
 	if err != nil {
 		t.Fatalf("error resetting layer reader: %v", err)
 	}
@@ -397,7 +396,7 @@ func TestBlobMount(t *testing.T) {
 		t.Fatalf("error getting seeker size of random data: %v", err)
 	}
 
-	nn, err := io.Copy(blobUpload, randomDataReader)
+	_, err = io.Copy(blobUpload, randomDataReader)
 	if err != nil {
 		t.Fatalf("unexpected error uploading layer data: %v", err)
 	}
@@ -460,7 +459,7 @@ func TestBlobMount(t *testing.T) {
 	defer rc.Close()
 
 	h := sha256.New()
-	nn, err = io.Copy(h, rc)
+	nn, err := io.Copy(h, rc)
 	if err != nil {
 		t.Fatalf("error reading layer: %v", err)
 	}
@@ -573,17 +572,17 @@ func simpleUpload(t *testing.T, bs distribution.BlobIngester, blob []byte, expec
 // the original state, returning the size. The state of the seeker should be
 // treated as unknown if an error is returned.
 func seekerSize(seeker io.ReadSeeker) (int64, error) {
-	current, err := seeker.Seek(0, os.SEEK_CUR)
+	current, err := seeker.Seek(0, io.SeekCurrent)
 	if err != nil {
 		return 0, err
 	}
 
-	end, err := seeker.Seek(0, os.SEEK_END)
+	end, err := seeker.Seek(0, io.SeekEnd)
 	if err != nil {
 		return 0, err
 	}
 
-	resumed, err := seeker.Seek(current, os.SEEK_SET)
+	resumed, err := seeker.Seek(current, io.SeekStart)
 	if err != nil {
 		return 0, err
 	}

registry/storage/blobwriter_resumable.go

@@ -29,7 +29,7 @@ func (bw *blobWriter) resumeDigest(ctx context.Context) error {
 		return errResumableDigestNotAvailable
 	}
 	offset := bw.fileWriter.Size()
-	if offset == int64(h.Len()) {
+	if offset == h.Len() {
 		// State of digester is already at the requested offset.
 		return nil
 	}
@@ -65,7 +65,7 @@ func (bw *blobWriter) resumeDigest(ctx context.Context) error {
 	}
 
 	// Mind the gap.
-	if gapLen := offset - int64(h.Len()); gapLen > 0 {
+	if gapLen := offset - h.Len(); gapLen > 0 {
 		return errResumableDigestNotAvailable
 	}
 
@@ -129,7 +129,7 @@ func (bw *blobWriter) storeHashState(ctx context.Context) error {
 		name:   bw.blobStore.repository.Named().String(),
 		id:     bw.id,
 		alg:    bw.digester.Digest().Algorithm(),
-		offset: int64(h.Len()),
+		offset: h.Len(),
 	})
 
 	if err != nil {

registry/storage/cache/cachecheck/suite.go

@@ -26,12 +26,12 @@ func checkBlobDescriptorCacheEmptyRepository(ctx context.Context, t *testing.T,
 		t.Fatalf("expected unknown blob error with empty store: %v", err)
 	}
 
-	cache, err := provider.RepositoryScoped("")
+	_, err := provider.RepositoryScoped("")
 	if err == nil {
 		t.Fatalf("expected an error when asking for invalid repo")
 	}
 
-	cache, err = provider.RepositoryScoped("foo/bar")
+	cache, err := provider.RepositoryScoped("foo/bar")
 	if err != nil {
 		t.Fatalf("unexpected error getting repository: %v", err)
 	}

registry/storage/catalog_test.go

@@ -273,7 +273,7 @@ func BenchmarkPathCompareNative(B *testing.B) {
 
 	for i := 0; i < B.N; i++ {
 		c := a < b
-		c = c && false
+		_ = c && false
 	}
 }
 
@@ -285,7 +285,7 @@ func BenchmarkPathCompareNativeEqual(B *testing.B) {
 
 	for i := 0; i < B.N; i++ {
 		c := a < b
-		c = c && false
+		_ = c && false
 	}
 }
 

registry/storage/driver/azure/azure.go

@@ -169,7 +169,7 @@ func (d *driver) Reader(ctx context.Context, path string, offset int64) (io.Read
 		return nil, err
 	}
 	info := blobRef.Properties
-	size := int64(info.ContentLength)
+	size := info.ContentLength
 	if offset >= size {
 		return ioutil.NopCloser(bytes.NewReader(nil)), nil
 	}
@@ -238,7 +238,7 @@ func (d *driver) Stat(ctx context.Context, path string) (storagedriver.FileInfo,
 
 		return storagedriver.FileInfoInternal{FileInfoFields: storagedriver.FileInfoFields{
 			Path:    path,
-			Size:    int64(blobProperties.ContentLength),
+			Size:    blobProperties.ContentLength,
 			ModTime: time.Time(blobProperties.LastModified),
 			IsDir:   false,
 		}}, nil

registry/storage/driver/filesystem/driver.go

@@ -184,11 +184,11 @@ func (d *driver) Reader(ctx context.Context, path string, offset int64) (io.Read
 		return nil, err
 	}
 
-	seekPos, err := file.Seek(int64(offset), os.SEEK_SET)
+	seekPos, err := file.Seek(offset, io.SeekStart)
 	if err != nil {
 		file.Close()
 		return nil, err
-	} else if seekPos < int64(offset) {
+	} else if seekPos < offset {
 		file.Close()
 		return nil, storagedriver.InvalidOffsetError{Path: path, Offset: offset}
 	}
@@ -217,12 +217,12 @@ func (d *driver) Writer(ctx context.Context, subPath string, append bool) (stora
 			return nil, err
 		}
 	} else {
-		n, err := fp.Seek(0, os.SEEK_END)
+		n, err := fp.Seek(0, io.SeekEnd)
 		if err != nil {
 			fp.Close()
 			return nil, err
 		}
-		offset = int64(n)
+		offset = n
 	}
 
 	return newFileWriter(fp, offset), nil

registry/storage/driver/middleware/cloudfront/middleware.go

@@ -86,7 +86,7 @@ func newCloudFrontStorageMiddleware(storageDriver storagedriver.StorageDriver, o
 		return nil, fmt.Errorf("failed to read privatekey file: %s", err)
 	}
 
-	block, _ := pem.Decode([]byte(pkBytes))
+	block, _ := pem.Decode(pkBytes)
 	if block == nil {
 		return nil, fmt.Errorf("failed to decode private key as an rsa private key")
 	}

registry/storage/driver/middleware/redirect/middleware_test.go

@@ -1,6 +1,7 @@
 package middleware
 
 import (
+	"context"
 	"testing"
 
 	check "gopkg.in/check.v1"
@@ -36,7 +37,7 @@ func (s *MiddlewareSuite) TestHttpsPort(c *check.C) {
 	c.Assert(m.scheme, check.Equals, "https")
 	c.Assert(m.host, check.Equals, "example.com:5443")
 
-	url, err := middleware.URLFor(nil, "/rick/data", nil)
+	url, err := middleware.URLFor(context.TODO(), "/rick/data", nil)
 	c.Assert(err, check.Equals, nil)
 	c.Assert(url, check.Equals, "https://example.com:5443/rick/data")
 }
@@ -52,7 +53,7 @@ func (s *MiddlewareSuite) TestHTTP(c *check.C) {
 	c.Assert(m.scheme, check.Equals, "http")
 	c.Assert(m.host, check.Equals, "example.com")
 
-	url, err := middleware.URLFor(nil, "morty/data", nil)
+	url, err := middleware.URLFor(context.TODO(), "morty/data", nil)
 	c.Assert(err, check.Equals, nil)
 	c.Assert(url, check.Equals, "http://example.com/morty/data")
 }

registry/storage/driver/s3-aws/s3.go

@@ -197,14 +197,14 @@ func FromParameters(parameters map[string]interface{}) (*Driver, error) {
 		regionEndpoint = ""
 	}
 
-	regionName, ok := parameters["region"]
+	regionName := parameters["region"]
 	if regionName == nil || fmt.Sprint(regionName) == "" {
 		return nil, fmt.Errorf("No region parameter provided")
 	}
 	region := fmt.Sprint(regionName)
 	// Don't check the region value if a custom endpoint is provided.
 	if regionEndpoint == "" {
-		if _, ok = validRegions[region]; !ok {
+		if _, ok := validRegions[region]; !ok {
 			return nil, fmt.Errorf("Invalid region provided: %v", region)
 		}
 	}
@@ -398,6 +398,10 @@ func New(params DriverParameters) (*Driver, error) {
 	}
 
 	awsConfig := aws.NewConfig()
+	sess, err := session.NewSession()
+	if err != nil {
+		return nil, fmt.Errorf("failed to create new session: %v", err)
+	}
 	creds := credentials.NewChainCredentials([]credentials.Provider{
 		&credentials.StaticProvider{
 			Value: credentials.Value{
@@ -408,7 +412,7 @@ func New(params DriverParameters) (*Driver, error) {
 		},
 		&credentials.EnvProvider{},
 		&credentials.SharedCredentialsProvider{},
-		&ec2rolecreds.EC2RoleProvider{Client: ec2metadata.New(session.New())},
+		&ec2rolecreds.EC2RoleProvider{Client: ec2metadata.New(sess)},
 	})
 
 	if params.RegionEndpoint != "" {
@@ -426,7 +430,11 @@ func New(params DriverParameters) (*Driver, error) {
 		})
 	}
 
-	s3obj := s3.New(session.New(awsConfig))
+	sess, err = session.NewSession(awsConfig)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create new session with aws config: %v", err)
+	}
+	s3obj := s3.New(sess)
 
 	// enable S3 compatible signature v2 signing instead
 	if !params.V4Auth {
@@ -1150,10 +1158,10 @@ func (w *writer) Write(p []byte) (int, error) {
 				Bucket: aws.String(w.driver.Bucket),
 				Key:    aws.String(w.key),
 			})
-			defer resp.Body.Close()
 			if err != nil {
 				return 0, err
 			}
+			defer resp.Body.Close()
 			w.parts = nil
 			w.readyPart, err = ioutil.ReadAll(resp.Body)
 			if err != nil {

registry/storage/driver/s3-aws/s3_test.go

@@ -139,14 +139,14 @@ func TestEmptyRootList(t *testing.T) {
 	}
 	defer rootedDriver.Delete(ctx, filename)
 
-	keys, err := emptyRootDriver.List(ctx, "/")
+	keys, _ := emptyRootDriver.List(ctx, "/")
 	for _, path := range keys {
 		if !storagedriver.PathRegexp.MatchString(path) {
 			t.Fatalf("unexpected string in path: %q != %q", path, storagedriver.PathRegexp)
 		}
 	}
 
-	keys, err = slashRootDriver.List(ctx, "/")
+	keys, _ = slashRootDriver.List(ctx, "/")
 	for _, path := range keys {
 		if !storagedriver.PathRegexp.MatchString(path) {
 			t.Fatalf("unexpected string in path: %q != %q", path, storagedriver.PathRegexp)

registry/storage/driver/s3-aws/s3_v2_signer.go

@@ -209,9 +209,9 @@ func (v2 *signer) Sign() error {
 	v2.signature = base64.StdEncoding.EncodeToString(hash.Sum(nil))
 
 	if expires {
-		params["Signature"] = []string{string(v2.signature)}
+		params["Signature"] = []string{v2.signature}
 	} else {
-		headers["Authorization"] = []string{"AWS " + accessKey + ":" + string(v2.signature)}
+		headers["Authorization"] = []string{"AWS " + accessKey + ":" + v2.signature}
 	}
 
 	log.WithFields(log.Fields{

registry/storage/driver/s3-goamz/s3_test.go

@@ -125,14 +125,14 @@ func TestEmptyRootList(t *testing.T) {
 	}
 	defer rootedDriver.Delete(ctx, filename)
 
-	keys, err := emptyRootDriver.List(ctx, "/")
+	keys, _ := emptyRootDriver.List(ctx, "/")
 	for _, path := range keys {
 		if !storagedriver.PathRegexp.MatchString(path) {
 			t.Fatalf("unexpected string in path: %q != %q", path, storagedriver.PathRegexp)
 		}
 	}
 
-	keys, err = slashRootDriver.List(ctx, "/")
+	keys, _ = slashRootDriver.List(ctx, "/")
 	for _, path := range keys {
 		if !storagedriver.PathRegexp.MatchString(path) {
 			t.Fatalf("unexpected string in path: %q != %q", path, storagedriver.PathRegexp)

registry/storage/driver/swift/swift_test.go

@@ -148,14 +148,14 @@ func TestEmptyRootList(t *testing.T) {
 		t.Fatalf("unexpected error creating content: %v", err)
 	}
 
-	keys, err := emptyRootDriver.List(ctx, "/")
+	keys, _ := emptyRootDriver.List(ctx, "/")
 	for _, path := range keys {
 		if !storagedriver.PathRegexp.MatchString(path) {
 			t.Fatalf("unexpected string in path: %q != %q", path, storagedriver.PathRegexp)
 		}
 	}
 
-	keys, err = slashRootDriver.List(ctx, "/")
+	keys, _ = slashRootDriver.List(ctx, "/")
 	for _, path := range keys {
 		if !storagedriver.PathRegexp.MatchString(path) {
 			t.Fatalf("unexpected string in path: %q != %q", path, storagedriver.PathRegexp)
@@ -234,11 +234,11 @@ func TestFilenameChunking(t *testing.T) {
 	}
 
 	// Test 0 and < 0 sizes
-	actual, err = chunkFilenames(nil, 0)
+	_, err = chunkFilenames(nil, 0)
 	if err == nil {
 		t.Fatal("expected error for size = 0")
 	}
-	actual, err = chunkFilenames(nil, -1)
+	_, err = chunkFilenames(nil, -1)
 	if err == nil {
 		t.Fatal("expected error for size = -1")
 	}

registry/storage/driver/testsuites/testsuites.go

@@ -136,7 +136,7 @@ func (suite *DriverSuite) deletePath(c *check.C, path string) {
 			err = nil
 		}
 		c.Assert(err, check.IsNil)
-		paths, err := suite.StorageDriver.List(suite.ctx, path)
+		paths, _ := suite.StorageDriver.List(suite.ctx, path)
 		if len(paths) == 0 {
 			break
 		}
@@ -651,7 +651,7 @@ func (suite *DriverSuite) TestURLFor(c *check.C) {
 	}
 	c.Assert(err, check.IsNil)
 
-	response, err = http.Head(url)
+	response, _ = http.Head(url)
 	c.Assert(response.StatusCode, check.Equals, 200)
 	c.Assert(response.ContentLength, check.Equals, int64(32))
 }
@@ -1116,7 +1116,7 @@ func (suite *DriverSuite) testFileStreams(c *check.C, size int64) {
 	c.Assert(err, check.IsNil)
 
 	tf.Sync()
-	tf.Seek(0, os.SEEK_SET)
+	tf.Seek(0, io.SeekStart)
 
 	writer, err := suite.StorageDriver.Writer(suite.ctx, filename, false)
 	c.Assert(err, check.IsNil)

registry/storage/filereader.go

@@ -7,7 +7,6 @@ import (
 	"fmt"
 	"io"
 	"io/ioutil"
-	"os"
 
 	storagedriver "github.com/docker/distribution/registry/storage/driver"
 )
@@ -81,12 +80,12 @@ func (fr *fileReader) Seek(offset int64, whence int) (int64, error) {
 	newOffset := fr.offset
 
 	switch whence {
-	case os.SEEK_CUR:
+	case io.SeekCurrent:
-		newOffset += int64(offset)
+		newOffset += offset
-	case os.SEEK_END:
+	case io.SeekEnd:
-		newOffset = fr.size + int64(offset)
+		newOffset = fr.size + offset
-	case os.SEEK_SET:
+	case io.SeekStart:
-		newOffset = int64(offset)
+		newOffset = offset
 	}
 
 	if newOffset < 0 {

registry/storage/filereader_test.go

@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"io"
 	mrand "math/rand"
-	"os"
 	"testing"
 
 	"github.com/docker/distribution/context"
@@ -72,7 +71,7 @@ func TestFileReaderSeek(t *testing.T) {
 	for _, repitition := range mrand.Perm(repititions - 1) {
 		targetOffset := int64(len(pattern) * repitition)
 		// Seek to a multiple of pattern size and read pattern size bytes
-		offset, err := fr.Seek(targetOffset, os.SEEK_SET)
+		offset, err := fr.Seek(targetOffset, io.SeekStart)
 		if err != nil {
 			t.Fatalf("unexpected error seeking: %v", err)
 		}
@@ -97,7 +96,7 @@ func TestFileReaderSeek(t *testing.T) {
 		}
 
 		// Check offset
-		current, err := fr.Seek(0, os.SEEK_CUR)
+		current, err := fr.Seek(0, io.SeekCurrent)
 		if err != nil {
 			t.Fatalf("error checking current offset: %v", err)
 		}
@@ -107,7 +106,7 @@ func TestFileReaderSeek(t *testing.T) {
 		}
 	}
 
-	start, err := fr.Seek(0, os.SEEK_SET)
+	start, err := fr.Seek(0, io.SeekStart)
 	if err != nil {
 		t.Fatalf("error seeking to start: %v", err)
 	}
@@ -116,7 +115,7 @@ func TestFileReaderSeek(t *testing.T) {
 		t.Fatalf("expected to seek to start: %v != 0", start)
 	}
 
-	end, err := fr.Seek(0, os.SEEK_END)
+	end, err := fr.Seek(0, io.SeekEnd)
 	if err != nil {
 		t.Fatalf("error checking current offset: %v", err)
 	}
@@ -128,13 +127,13 @@ func TestFileReaderSeek(t *testing.T) {
 	// 4. Seek before start, ensure error.
 
 	// seek before start
-	before, err := fr.Seek(-1, os.SEEK_SET)
+	before, err := fr.Seek(-1, io.SeekStart)
 	if err == nil {
 		t.Fatalf("error expected, returned offset=%v", before)
 	}
 
 	// 5. Seek after end,
-	after, err := fr.Seek(1, os.SEEK_END)
+	after, err := fr.Seek(1, io.SeekEnd)
 	if err != nil {
 		t.Fatalf("unexpected error expected, returned offset=%v", after)
 	}

registry/storage/garbagecollect_test.go

@@ -164,7 +164,7 @@ func TestNoDeletionNoEffect(t *testing.T) {
 
 	registry := createRegistry(t, inmemoryDriver)
 	repo := makeRepository(t, registry, "palailogos")
-	manifestService, err := repo.Manifests(ctx)
+	manifestService, _ := repo.Manifests(ctx)
 
 	image1 := uploadRandomSchema1Image(t, repo)
 	image2 := uploadRandomSchema1Image(t, repo)
@@ -206,7 +206,7 @@ func TestDeleteManifestIfTagNotFound(t *testing.T) {
 
 	registry := createRegistry(t, inmemoryDriver)
 	repo := makeRepository(t, registry, "deletemanifests")
-	manifestService, err := repo.Manifests(ctx)
+	manifestService, _ := repo.Manifests(ctx)
 
 	// Create random layers
 	randomLayers1, err := testutil.CreateRandomLayers(3)
@@ -252,7 +252,7 @@ func TestDeleteManifestIfTagNotFound(t *testing.T) {
 	}
 
 	manifestEnumerator, _ := manifestService.(distribution.ManifestEnumerator)
-	err = manifestEnumerator.Enumerate(ctx, func(dgst digest.Digest) error {
+	manifestEnumerator.Enumerate(ctx, func(dgst digest.Digest) error {
 		repo.Tags(ctx).Tag(ctx, "test", distribution.Descriptor{Digest: dgst})
 		return nil
 	})
@@ -336,7 +336,7 @@ func TestDeletionHasEffect(t *testing.T) {
 
 	registry := createRegistry(t, inmemoryDriver)
 	repo := makeRepository(t, registry, "komnenos")
-	manifests, err := repo.Manifests(ctx)
+	manifests, _ := repo.Manifests(ctx)
 
 	image1 := uploadRandomSchema1Image(t, repo)
 	image2 := uploadRandomSchema1Image(t, repo)
@@ -346,7 +346,7 @@ func TestDeletionHasEffect(t *testing.T) {
 	manifests.Delete(ctx, image3.manifestDigest)
 
 	// Run GC
-	err = MarkAndSweep(context.Background(), inmemoryDriver, registry, GCOpts{
+	err := MarkAndSweep(context.Background(), inmemoryDriver, registry, GCOpts{
 		DryRun:         false,
 		RemoveUntagged: false,
 	})

registry/storage/purgeuploads.go

@@ -22,7 +22,7 @@ func newUploadData() uploadData {
 	return uploadData{
 		containingDir: "",
 		// default to far in future to protect against missing startedat
-		startedAt: time.Now().Add(time.Duration(10000 * time.Hour)),
+		startedAt: time.Now().Add(10000 * time.Hour),
 	}
 }
 

registry/storage/tagstore.go

@@ -179,7 +179,7 @@ func (ts *tagStore) Lookup(ctx context.Context, desc distribution.Descriptor) ([
 			tag:  tag,
 		}
 
-		tagLinkPath, err := pathFor(tagLinkPathSpec)
+		tagLinkPath, _ := pathFor(tagLinkPathSpec)
 		tagDigest, err := ts.blobStore.readlink(ctx, tagLinkPath)
 		if err != nil {
 			switch err.(type) {

testutil/tarfile.go

@@ -88,8 +88,7 @@ func CreateRandomLayers(n int) (map[digest.Digest]io.ReadSeeker, error) {
 			return nil, fmt.Errorf("unexpected error generating test layer file: %v", err)
 		}
 
-		dgst := digest.Digest(ds)
+		digestMap[ds] = rs
-		digestMap[dgst] = rs
 	}
 	return digestMap, nil
 }