update vendor

Signed-off-by: Roland.Ma <rolandma@yunify.com>

vendor/github.com/deislabs/oras/pkg/content/utils.go

@@ -0,0 +1,171 @@
+package content
+
+import (
+	"archive/tar"
+	"compress/gzip"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"strings"
+	"time"
+
+	digest "github.com/opencontainers/go-digest"
+	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
+	"github.com/pkg/errors"
+)
+
+// ResolveName resolves name from descriptor
+func ResolveName(desc ocispec.Descriptor) (string, bool) {
+	name, ok := desc.Annotations[ocispec.AnnotationTitle]
+	return name, ok
+}
+
+// tarDirectory walks the directory specified by path, and tar those files with a new
+// path prefix.
+func tarDirectory(root, prefix string, w io.Writer, stripTimes bool) error {
+	tw := tar.NewWriter(w)
+	defer tw.Close()
+	if err := filepath.Walk(root, func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+
+		// Rename path
+		name, err := filepath.Rel(root, path)
+		if err != nil {
+			return err
+		}
+		name = filepath.Join(prefix, name)
+		name = filepath.ToSlash(name)
+
+		// Generate header
+		var link string
+		mode := info.Mode()
+		if mode&os.ModeSymlink != 0 {
+			if link, err = os.Readlink(path); err != nil {
+				return err
+			}
+		}
+		header, err := tar.FileInfoHeader(info, link)
+		if err != nil {
+			return errors.Wrap(err, path)
+		}
+		header.Name = name
+		header.Uid = 0
+		header.Gid = 0
+		header.Uname = ""
+		header.Gname = ""
+
+		if stripTimes {
+			header.ModTime = time.Time{}
+			header.AccessTime = time.Time{}
+			header.ChangeTime = time.Time{}
+		}
+
+		// Write file
+		if err := tw.WriteHeader(header); err != nil {
+			return errors.Wrap(err, "tar")
+		}
+		if mode.IsRegular() {
+			file, err := os.Open(path)
+			if err != nil {
+				return err
+			}
+			defer file.Close()
+			if _, err := io.Copy(tw, file); err != nil {
+				return errors.Wrap(err, path)
+			}
+		}
+
+		return nil
+	}); err != nil {
+		return err
+	}
+	return nil
+}
+
+// extractTarDirectory extracts tar file to a directory specified by the `root`
+// parameter. The file name prefix is ensured to be the string specified by the
+// `prefix` parameter and is trimmed.
+func extractTarDirectory(root, prefix string, r io.Reader) error {
+	tr := tar.NewReader(r)
+	for {
+		header, err := tr.Next()
+		if err != nil {
+			if err == io.EOF {
+				return nil
+			}
+			return err
+		}
+
+		// Name check
+		name := header.Name
+		path, err := filepath.Rel(prefix, name)
+		if err != nil {
+			return err
+		}
+		if strings.HasPrefix(path, "../") {
+			return fmt.Errorf("%q does not have prefix %q", name, prefix)
+		}
+		path = filepath.Join(root, path)
+
+		// Create content
+		switch header.Typeflag {
+		case tar.TypeReg:
+			err = writeFile(path, tr, header.FileInfo().Mode())
+		case tar.TypeDir:
+			err = os.MkdirAll(path, header.FileInfo().Mode())
+		case tar.TypeLink:
+			err = os.Link(header.Linkname, path)
+		case tar.TypeSymlink:
+			err = os.Symlink(header.Linkname, path)
+		default:
+			continue // Non-regular files are skipped
+		}
+		if err != nil {
+			return err
+		}
+
+		// Change access time and modification time if possible (error ignored)
+		os.Chtimes(path, header.AccessTime, header.ModTime)
+	}
+}
+
+func writeFile(path string, r io.Reader, perm os.FileMode) error {
+	file, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, perm)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+	_, err = io.Copy(file, r)
+	return err
+}
+
+func extractTarGzip(root, prefix, filename, checksum string) error {
+	file, err := os.Open(filename)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+	zr, err := gzip.NewReader(file)
+	if err != nil {
+		return err
+	}
+	defer zr.Close()
+	var r io.Reader = zr
+	var verifier digest.Verifier
+	if checksum != "" {
+		if digest, err := digest.Parse(checksum); err == nil {
+			verifier = digest.Verifier()
+			r = io.TeeReader(r, verifier)
+		}
+	}
+	if err := extractTarDirectory(root, prefix, r); err != nil {
+		return err
+	}
+	if verifier != nil && !verifier.Verified() {
+		return errors.New("content digest mismatch")
+	}
+	return nil
+}