Update to benefit from Go 1.16

copy/copy.go

@@ -5,7 +5,6 @@ import (
 	"context"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"os"
 	"reflect"
 	"strings"
@@ -199,7 +198,7 @@ func Image(ctx context.Context, policyContext *signature.PolicyContext, destRef,
 		return nil, err
 	}
 
-	reportWriter := ioutil.Discard
+	reportWriter := io.Discard
 
 	if options.ReportWriter != nil {
 		reportWriter = options.ReportWriter
@@ -232,7 +231,7 @@ func Image(ctx context.Context, policyContext *signature.PolicyContext, destRef,
 	// createProgressBar() will print a single line instead.
 	progressOutput := reportWriter
 	if !isTTY(reportWriter) {
-		progressOutput = ioutil.Discard
+		progressOutput = io.Discard
 	}
 
 	c := &copier{
@@ -1091,7 +1090,7 @@ func customPartialBlobDecorFunc(s decor.Statistics) string {
 }
 
 // createProgressBar creates a mpb.Bar in pool.  Note that if the copier's reportWriter
-// is ioutil.Discard, the progress bar's output will be discarded
+// is io.Discard, the progress bar's output will be discarded
 // NOTE: Every progress bar created within a progress pool must either successfully
 // complete or be aborted, or pool.Wait() will hang. That is typically done
 // using "defer bar.Abort(false)", which must happen BEFORE pool.Wait() is called.
@@ -1143,7 +1142,7 @@ func (c *copier) createProgressBar(pool *mpb.Progress, partial bool, info types.
 			),
 		)
 	}
-	if c.progressOutput == ioutil.Discard {
+	if c.progressOutput == io.Discard {
 		c.Printf("Copying %s %s\n", kind, info.Digest)
 	}
 	return bar
@@ -1669,7 +1668,7 @@ func (c *copier) copyBlobFromStream(ctx context.Context, srcStream io.Reader, sr
 	// sent there if we are not already at EOF.
 	if getOriginalLayerCopyWriter != nil {
 		logrus.Debugf("Consuming rest of the original blob to satisfy getOriginalLayerCopyWriter")
-		_, err := io.Copy(ioutil.Discard, originalLayerReader)
+		_, err := io.Copy(io.Discard, originalLayerReader)
 		if err != nil {
 			return types.BlobInfo{}, errors.Wrapf(err, "reading input blob %s", srcInfo.Digest)
 		}

copy/sign_test.go

@@ -2,7 +2,7 @@ package copy
 
 import (
 	"context"
-	"io/ioutil"
+	"io"
 	"os"
 	"testing"
 
@@ -48,7 +48,7 @@ func TestCreateSignature(t *testing.T) {
 	defer dirDest.Close()
 	c := &copier{
 		dest:         imagedestination.FromPublic(dirDest),
-		reportWriter: ioutil.Discard,
+		reportWriter: io.Discard,
 	}
 	_, err = c.createSignature(manifestBlob, testKeyFingerprint, "", nil)
 	assert.Error(t, err)
@@ -62,7 +62,7 @@ func TestCreateSignature(t *testing.T) {
 	defer dockerDest.Close()
 	c = &copier{
 		dest:         imagedestination.FromPublic(dockerDest),
-		reportWriter: ioutil.Discard,
+		reportWriter: io.Discard,
 	}
 
 	// Signing with an unknown key fails

directory/directory_dest.go

@@ -3,7 +3,6 @@ package directory
 import (
 	"context"
 	"io"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"runtime"
@@ -62,7 +61,7 @@ func newImageDestination(sys *types.SystemContext, ref dirReference) (types.Imag
 				return nil, errors.Wrapf(err, "checking if path exists %q", d.ref.versionPath())
 			}
 			if versionExists {
-				contents, err := ioutil.ReadFile(d.ref.versionPath())
+				contents, err := os.ReadFile(d.ref.versionPath())
 				if err != nil {
 					return nil, err
 				}
@@ -86,7 +85,7 @@ func newImageDestination(sys *types.SystemContext, ref dirReference) (types.Imag
 		}
 	}
 	// create version file
-	err = ioutil.WriteFile(d.ref.versionPath(), []byte(version), 0644)
+	err = os.WriteFile(d.ref.versionPath(), []byte(version), 0644)
 	if err != nil {
 		return nil, errors.Wrapf(err, "creating version file %q", d.ref.versionPath())
 	}
@@ -149,7 +148,7 @@ func (d *dirImageDestination) HasThreadSafePutBlob() bool {
 // to any other readers for download using the supplied digest.
 // If stream.Read() at any time, ESPECIALLY at end of input, returns an error, PutBlob MUST 1) fail, and 2) delete any data stored so far.
 func (d *dirImageDestination) PutBlob(ctx context.Context, stream io.Reader, inputInfo types.BlobInfo, cache types.BlobInfoCache, isConfig bool) (types.BlobInfo, error) {
-	blobFile, err := ioutil.TempFile(d.ref.path, "dir-put-blob")
+	blobFile, err := os.CreateTemp(d.ref.path, "dir-put-blob")
 	if err != nil {
 		return types.BlobInfo{}, err
 	}
@@ -232,15 +231,15 @@ func (d *dirImageDestination) TryReusingBlob(ctx context.Context, info types.Blo
 // If the destination is in principle available, refuses this manifest type (e.g. it does not recognize the schema),
 // but may accept a different manifest type, the returned error must be an ManifestTypeRejectedError.
 func (d *dirImageDestination) PutManifest(ctx context.Context, manifest []byte, instanceDigest *digest.Digest) error {
-	return ioutil.WriteFile(d.ref.manifestPath(instanceDigest), manifest, 0644)
+	return os.WriteFile(d.ref.manifestPath(instanceDigest), manifest, 0644)
 }
 
 // PutSignatures writes a set of signatures to the destination.
 // If instanceDigest is not nil, it contains a digest of the specific manifest instance to write or overwrite the signatures for
 // (when the primary manifest is a manifest list); this should always be nil if the primary manifest is not a manifest list.
 func (d *dirImageDestination) PutSignatures(ctx context.Context, signatures [][]byte, instanceDigest *digest.Digest) error {
 	for i, sig := range signatures {
-		if err := ioutil.WriteFile(d.ref.signaturePath(i, instanceDigest), sig, 0644); err != nil {
+		if err := os.WriteFile(d.ref.signaturePath(i, instanceDigest), sig, 0644); err != nil {
 			return err
 		}
 	}
@@ -272,7 +271,7 @@ func pathExists(path string) (bool, error) {
 
 // returns true if directory is empty
 func isDirEmpty(path string) (bool, error) {
-	files, err := ioutil.ReadDir(path)
+	files, err := os.ReadDir(path)
 	if err != nil {
 		return false, err
 	}
@@ -281,7 +280,7 @@ func isDirEmpty(path string) (bool, error) {
 
 // deletes the contents of a directory
 func removeDirContents(path string) error {
-	files, err := ioutil.ReadDir(path)
+	files, err := os.ReadDir(path)
 	if err != nil {
 		return err
 	}

directory/directory_src.go

@@ -3,7 +3,6 @@ package directory
 import (
 	"context"
 	"io"
-	"io/ioutil"
 	"os"
 
 	"github.com/containers/image/v5/manifest"
@@ -37,7 +36,7 @@ func (s *dirImageSource) Close() error {
 // If instanceDigest is not nil, it contains a digest of the specific manifest instance to retrieve (when the primary manifest is a manifest list);
 // this never happens if the primary manifest is not a manifest list (e.g. if the source never returns manifest lists).
 func (s *dirImageSource) GetManifest(ctx context.Context, instanceDigest *digest.Digest) ([]byte, string, error) {
-	m, err := ioutil.ReadFile(s.ref.manifestPath(instanceDigest))
+	m, err := os.ReadFile(s.ref.manifestPath(instanceDigest))
 	if err != nil {
 		return nil, "", err
 	}
@@ -71,7 +70,7 @@ func (s *dirImageSource) GetBlob(ctx context.Context, info types.BlobInfo, cache
 func (s *dirImageSource) GetSignatures(ctx context.Context, instanceDigest *digest.Digest) ([][]byte, error) {
 	signatures := [][]byte{}
 	for i := 0; ; i++ {
-		signature, err := ioutil.ReadFile(s.ref.signaturePath(i, instanceDigest))
+		signature, err := os.ReadFile(s.ref.signaturePath(i, instanceDigest))
 		if err != nil {
 			if os.IsNotExist(err) {
 				break

directory/directory_test.go

@@ -3,7 +3,7 @@ package directory
 import (
 	"bytes"
 	"context"
-	"io/ioutil"
+	"io"
 	"os"
 	"testing"
 
@@ -92,7 +92,7 @@ func TestGetPutBlob(t *testing.T) {
 		rc, size, err := src.GetBlob(context.Background(), types.BlobInfo{Digest: digest, Size: int64(len(expectedBlob))}, cache)
 		assert.NoError(t, err)
 		defer rc.Close()
-		b, err := ioutil.ReadAll(rc)
+		b, err := io.ReadAll(rc)
 		assert.NoError(t, err)
 		assert.Equal(t, expectedBlob, b)
 		assert.Equal(t, int64(len(expectedBlob)), size)

directory/directory_transport_test.go

@@ -2,7 +2,6 @@ package directory
 
 import (
 	"context"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"testing"
@@ -145,7 +144,7 @@ func TestReferenceNewImage(t *testing.T) {
 	dest, err := ref.NewImageDestination(context.Background(), nil)
 	require.NoError(t, err)
 	defer dest.Close()
-	mFixture, err := ioutil.ReadFile("../manifest/fixtures/v2s1.manifest.json")
+	mFixture, err := os.ReadFile("../manifest/fixtures/v2s1.manifest.json")
 	require.NoError(t, err)
 	err = dest.PutManifest(context.Background(), mFixture, nil)
 	assert.NoError(t, err)

docker/archive/transport_test.go

@@ -3,7 +3,6 @@ package archive
 import (
 	"context"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path/filepath"
 	"testing"
@@ -271,7 +270,7 @@ func TestReferenceDeleteImage(t *testing.T) {
 
 	for i, suffix := range []string{"", ":some-reference", ":@0"} {
 		testFile := filepath.Join(tmpDir, fmt.Sprintf("file%d.tar", i))
-		err := ioutil.WriteFile(testFile, []byte("nonempty"), 0644)
+		err := os.WriteFile(testFile, []byte("nonempty"), 0644)
 		require.NoError(t, err, suffix)
 
 		ref, err := ParseReference(testFile + suffix)

docker/docker_client.go

@@ -7,7 +7,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"net/url"
 	"os"
@@ -654,7 +653,7 @@ func (c *dockerClient) getBearerTokenOAuth2(ctx context.Context, challenge chall
 	params.Add("refresh_token", c.auth.IdentityToken)
 	params.Add("client_id", "containers/image")
 
-	authReq.Body = ioutil.NopCloser(bytes.NewBufferString(params.Encode()))
+	authReq.Body = io.NopCloser(bytes.NewBufferString(params.Encode()))
 	authReq.Header.Add("User-Agent", c.userAgent)
 	authReq.Header.Add("Content-Type", "application/x-www-form-urlencoded")
 	logrus.Debugf("%s %s", authReq.Method, authReq.URL.Redacted())

docker/docker_image_dest.go

@@ -7,7 +7,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"net/url"
 	"os"
@@ -592,7 +591,7 @@ func (d *dockerImageDestination) putOneSignature(url *url.URL, signature []byte)
 		if err != nil {
 			return err
 		}
-		err = ioutil.WriteFile(url.Path, signature, 0644)
+		err = os.WriteFile(url.Path, signature, 0644)
 		if err != nil {
 			return err
 		}

docker/docker_image_src.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"fmt"
 	"io"
-	"io/ioutil"
 	"mime"
 	"mime/multipart"
 	"net/http"
@@ -308,15 +307,15 @@ func splitHTTP200ResponseToPartial(streams chan io.ReadCloser, errs chan error,
 				break
 			}
 			toSkip := c.Offset - currentOffset
-			if _, err := io.Copy(ioutil.Discard, io.LimitReader(body, int64(toSkip))); err != nil {
+			if _, err := io.Copy(io.Discard, io.LimitReader(body, int64(toSkip))); err != nil {
 				errs <- err
 				break
 			}
 			currentOffset += toSkip
 		}
 		s := signalCloseReader{
 			closed:        make(chan interface{}),
-			stream:        ioutil.NopCloser(io.LimitReader(body, int64(c.Length))),
+			stream:        io.NopCloser(io.LimitReader(body, int64(c.Length))),
 			consumeStream: true,
 		}
 		streams <- s
@@ -515,7 +514,7 @@ func (s *dockerImageSource) getOneSignature(ctx context.Context, url *url.URL) (
 	switch url.Scheme {
 	case "file":
 		logrus.Debugf("Reading %s", url.Path)
-		sig, err := ioutil.ReadFile(url.Path)
+		sig, err := os.ReadFile(url.Path)
 		if err != nil {
 			if os.IsNotExist(err) {
 				return nil, true, nil
@@ -765,7 +764,7 @@ func (s signalCloseReader) Read(p []byte) (int, error) {
 func (s signalCloseReader) Close() error {
 	defer close(s.closed)
 	if s.consumeStream {
-		if _, err := io.Copy(ioutil.Discard, s.stream); err != nil {
+		if _, err := io.Copy(io.Discard, s.stream); err != nil {
 			s.stream.Close()
 			return err
 		}

docker/docker_image_src_test.go

@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"context"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
 	"net/url"
@@ -51,11 +50,11 @@ location = "with-mirror.example.com"
 [[registry.mirror]]
 location = "@REGISTRY@/with-mirror"
 `, "@REGISTRY@", registry, -1)
-	registriesConf, err := ioutil.TempFile("", "docker-image-src")
+	registriesConf, err := os.CreateTemp("", "docker-image-src")
 	require.NoError(t, err)
 	defer registriesConf.Close()
 	defer os.Remove(registriesConf.Name())
-	err = ioutil.WriteFile(registriesConf.Name(), []byte(mirrorConfiguration), 0600)
+	err = os.WriteFile(registriesConf.Name(), []byte(mirrorConfiguration), 0600)
 	require.NoError(t, err)
 
 	for _, c := range []struct{ input, physical string }{
@@ -108,7 +107,7 @@ func readNextStream(streams chan io.ReadCloser, errs chan error) ([]byte, error)
 			return nil, nil
 		}
 		defer r.Close()
-		return ioutil.ReadAll(r)
+		return io.ReadAll(r)
 	case err := <-errs:
 		return nil, err
 	}
@@ -128,7 +127,7 @@ func verifyGetBlobAtOutput(t *testing.T, streams chan io.ReadCloser, errs chan e
 }
 
 func TestSplitHTTP200ResponseToPartial(t *testing.T) {
-	body := ioutil.NopCloser(bytes.NewReader([]byte("123456789")))
+	body := io.NopCloser(bytes.NewReader([]byte("123456789")))
 	defer body.Close()
 	streams := make(chan io.ReadCloser)
 	errs := make(chan error)
@@ -148,7 +147,7 @@ func TestSplitHTTP200ResponseToPartial(t *testing.T) {
 }
 
 func TestHandle206Response(t *testing.T) {
-	body := ioutil.NopCloser(bytes.NewReader([]byte("--AAA\r\n\r\n23\r\n--AAA\r\n\r\n5\r\n--AAA--")))
+	body := io.NopCloser(bytes.NewReader([]byte("--AAA\r\n\r\n23\r\n--AAA\r\n\r\n5\r\n--AAA--")))
 	defer body.Close()
 	streams := make(chan io.ReadCloser)
 	errs := make(chan error)
@@ -169,7 +168,7 @@ func TestHandle206Response(t *testing.T) {
 	}
 	verifyGetBlobAtOutput(t, streams, errs, expected)
 
-	body = ioutil.NopCloser(bytes.NewReader([]byte("HELLO")))
+	body = io.NopCloser(bytes.NewReader([]byte("HELLO")))
 	defer body.Close()
 	streams = make(chan io.ReadCloser)
 	errs = make(chan error)

docker/internal/tarfile/reader.go

@@ -4,7 +4,6 @@ import (
 	"archive/tar"
 	"encoding/json"
 	"io"
-	"io/ioutil"
 	"os"
 	"path"
 
@@ -53,7 +52,7 @@ func NewReaderFromFile(sys *types.SystemContext, path string) (*Reader, error) {
 // The caller should call .Close() on the returned archive when done.
 func NewReaderFromStream(sys *types.SystemContext, inputStream io.Reader) (*Reader, error) {
 	// Save inputStream to a temporary file
-	tarCopyFile, err := ioutil.TempFile(tmpdir.TemporaryDirectoryForBigFiles(sys), "docker-tar")
+	tarCopyFile, err := os.CreateTemp(tmpdir.TemporaryDirectoryForBigFiles(sys), "docker-tar")
 	if err != nil {
 		return nil, errors.Wrap(err, "creating temporary file")
 	}