bump containers/image to v5.0.0, buildah to v1.11.4

Move to containers/image v5 and containers/buildah to v1.11.4.

Replace an equality check with a type assertion when checking for a
docker.ErrUnauthorizedForCredentials in `podman login`.

Signed-off-by: Nalin Dahyabhai <nalin@redhat.com>

vendor/github.com/containers/image/v5/pkg/compression/compression.go

@@ -0,0 +1,149 @@
+package compression
+
+import (
+	"bytes"
+	"compress/bzip2"
+	"fmt"
+	"io"
+	"io/ioutil"
+
+	"github.com/containers/image/v5/pkg/compression/internal"
+	"github.com/containers/image/v5/pkg/compression/types"
+	"github.com/klauspost/pgzip"
+	"github.com/pkg/errors"
+	"github.com/sirupsen/logrus"
+	"github.com/ulikunitz/xz"
+)
+
+// Algorithm is a compression algorithm that can be used for CompressStream.
+type Algorithm = types.Algorithm
+
+var (
+	// Gzip compression.
+	Gzip = internal.NewAlgorithm("gzip", []byte{0x1F, 0x8B, 0x08}, GzipDecompressor, gzipCompressor)
+	// Bzip2 compression.
+	Bzip2 = internal.NewAlgorithm("bzip2", []byte{0x42, 0x5A, 0x68}, Bzip2Decompressor, bzip2Compressor)
+	// Xz compression.
+	Xz = internal.NewAlgorithm("Xz", []byte{0xFD, 0x37, 0x7A, 0x58, 0x5A, 0x00}, XzDecompressor, xzCompressor)
+	// Zstd compression.
+	Zstd = internal.NewAlgorithm("zstd", []byte{0x28, 0xb5, 0x2f, 0xfd}, ZstdDecompressor, zstdCompressor)
+
+	compressionAlgorithms = map[string]Algorithm{
+		Gzip.Name():  Gzip,
+		Bzip2.Name(): Bzip2,
+		Xz.Name():    Xz,
+		Zstd.Name():  Zstd,
+	}
+)
+
+// AlgorithmByName returns the compressor by its name
+func AlgorithmByName(name string) (Algorithm, error) {
+	algorithm, ok := compressionAlgorithms[name]
+	if ok {
+		return algorithm, nil
+	}
+	return Algorithm{}, fmt.Errorf("cannot find compressor for %q", name)
+}
+
+// DecompressorFunc returns the decompressed stream, given a compressed stream.
+// The caller must call Close() on the decompressed stream (even if the compressed input stream does not need closing!).
+type DecompressorFunc = internal.DecompressorFunc
+
+// GzipDecompressor is a DecompressorFunc for the gzip compression algorithm.
+func GzipDecompressor(r io.Reader) (io.ReadCloser, error) {
+	return pgzip.NewReader(r)
+}
+
+// Bzip2Decompressor is a DecompressorFunc for the bzip2 compression algorithm.
+func Bzip2Decompressor(r io.Reader) (io.ReadCloser, error) {
+	return ioutil.NopCloser(bzip2.NewReader(r)), nil
+}
+
+// XzDecompressor is a DecompressorFunc for the xz compression algorithm.
+func XzDecompressor(r io.Reader) (io.ReadCloser, error) {
+	r, err := xz.NewReader(r)
+	if err != nil {
+		return nil, err
+	}
+	return ioutil.NopCloser(r), nil
+}
+
+// gzipCompressor is a CompressorFunc for the gzip compression algorithm.
+func gzipCompressor(r io.Writer, level *int) (io.WriteCloser, error) {
+	if level != nil {
+		return pgzip.NewWriterLevel(r, *level)
+	}
+	return pgzip.NewWriter(r), nil
+}
+
+// bzip2Compressor is a CompressorFunc for the bzip2 compression algorithm.
+func bzip2Compressor(r io.Writer, level *int) (io.WriteCloser, error) {
+	return nil, fmt.Errorf("bzip2 compression not supported")
+}
+
+// xzCompressor is a CompressorFunc for the xz compression algorithm.
+func xzCompressor(r io.Writer, level *int) (io.WriteCloser, error) {
+	return xz.NewWriter(r)
+}
+
+// CompressStream returns the compressor by its name
+func CompressStream(dest io.Writer, algo Algorithm, level *int) (io.WriteCloser, error) {
+	return internal.AlgorithmCompressor(algo)(dest, level)
+}
+
+// DetectCompressionFormat returns a DecompressorFunc if the input is recognized as a compressed format, nil otherwise.
+// Because it consumes the start of input, other consumers must use the returned io.Reader instead to also read from the beginning.
+func DetectCompressionFormat(input io.Reader) (Algorithm, DecompressorFunc, io.Reader, error) {
+	buffer := [8]byte{}
+
+	n, err := io.ReadAtLeast(input, buffer[:], len(buffer))
+	if err != nil && err != io.EOF && err != io.ErrUnexpectedEOF {
+		// This is a “real” error. We could just ignore it this time, process the data we have, and hope that the source will report the same error again.
+		// Instead, fail immediately with the original error cause instead of a possibly secondary/misleading error returned later.
+		return Algorithm{}, nil, nil, err
+	}
+
+	var retAlgo Algorithm
+	var decompressor DecompressorFunc
+	for _, algo := range compressionAlgorithms {
+		if bytes.HasPrefix(buffer[:n], internal.AlgorithmPrefix(algo)) {
+			logrus.Debugf("Detected compression format %s", algo.Name())
+			retAlgo = algo
+			decompressor = internal.AlgorithmDecompressor(algo)
+			break
+		}
+	}
+	if decompressor == nil {
+		logrus.Debugf("No compression detected")
+	}
+
+	return retAlgo, decompressor, io.MultiReader(bytes.NewReader(buffer[:n]), input), nil
+}
+
+// DetectCompression returns a DecompressorFunc if the input is recognized as a compressed format, nil otherwise.
+// Because it consumes the start of input, other consumers must use the returned io.Reader instead to also read from the beginning.
+func DetectCompression(input io.Reader) (DecompressorFunc, io.Reader, error) {
+	_, d, r, e := DetectCompressionFormat(input)
+	return d, r, e
+}
+
+// AutoDecompress takes a stream and returns an uncompressed version of the
+// same stream.
+// The caller must call Close() on the returned stream (even if the input does not need,
+// or does not even support, closing!).
+func AutoDecompress(stream io.Reader) (io.ReadCloser, bool, error) {
+	decompressor, stream, err := DetectCompression(stream)
+	if err != nil {
+		return nil, false, errors.Wrapf(err, "Error detecting compression")
+	}
+	var res io.ReadCloser
+	if decompressor != nil {
+		res, err = decompressor(stream)
+		if err != nil {
+			return nil, false, errors.Wrapf(err, "Error initializing decompression")
+		}
+	} else {
+		res = ioutil.NopCloser(stream)
+	}
+	return res, decompressor != nil, nil
+}