feat(oci-layout): support in oras cp

cmd/oras/cp.go

@@ -30,15 +30,12 @@ import (
 )
 
 type copyOptions struct {
-	src option.Remote
-	dst option.Remote
 	option.Common
 	option.Platform
-	recursive bool
+	option.BinaryTarget
 
+	recursive   bool
 	concurrency int
-	srcRef      string
-	dstRef      string
 	extraRefs   []string
 }
 
@@ -52,54 +49,62 @@ func copyCmd() *cobra.Command {
 
 ** This command is in preview and under development. **
 
-Example - Copy the artifact tagged with 'v1' from repository 'localhost:5000/net-monitor' to repository 'localhost:5000/net-monitor-copy' 
-  oras cp localhost:5000/net-monitor:v1 localhost:5000/net-monitor-copy:v1
+Example - Copy an artifact between registries:
+  oras cp localhost:5000/net-monitor:v1 localhost:6000/net-monitor-copy:v1
 
-Example - Copy the artifact tagged with 'v1' and its referrers from repository 'localhost:5000/net-monitor' to 'localhost:5000/net-monitor-copy'
-  oras cp -r localhost:5000/net-monitor:v1 localhost:5000/net-monitor-copy:v1
+Example - Download an artifact into an OCI layout folder:
+  oras cp --to-oci-layout localhost:5000/net-monitor:v1 ./downloaded:v1
 
-Example - Copy the artifact tagged with 'v1' from repository 'localhost:5000/net-monitor' to 'localhost:5000/net-monitor-copy' with certain platform
-  oras cp --platform linux/arm/v5 localhost:5000/net-monitor:v1 localhost:5000/net-monitor-copy:v1 
+Example - Upload an artifact from an OCI layout folder:
+  oras cp --from-oci-layout ./to-upload:v1 localhost:5000/net-monitor:v1
 
-Example - Copy the artifact tagged with 'v1' from repository 'localhost:5000/net-monitor' to 'localhost:5000/net-monitor-copy' with multiple tags
-  oras cp localhost:5000/net-monitor:v1 localhost:5000/net-monitor-copy:v1,tag2,tag3
+Example - Upload an artifact from an OCI layout tar archive:
+  oras cp --from-oci-layout ./to-upload.tar:v1 localhost:5000/net-monitor:v1
 
-Example - Copy the artifact tagged with 'v1' from repository 'localhost:5000/net-monitor' to 'localhost:5000/net-monitor-copy' with multiple tags and concurrency level tuned
-  oras cp --concurrency 6 localhost:5000/net-monitor:v1 localhost:5000/net-monitor-copy:v1,tag2,tag3
+Example - Copy an artifact and its referrers:
+  oras cp -r localhost:5000/net-monitor:v1 localhost:6000/net-monitor-copy:v1
+
+Example - Copy certain platform of an artifact:
+  oras cp --platform linux/arm/v5 localhost:5000/net-monitor:v1 localhost:6000/net-monitor-copy:v1
+
+Example - Copy an artifact with multiple tags:
+  oras cp localhost:5000/net-monitor:v1 localhost:6000/net-monitor-copy:tag1,tag2,tag3
+
+Example - Copy an artifact with multiple tags with concurrency tuned:
+  oras cp --concurrency 10 localhost:5000/net-monitor:v1 localhost:5000/net-monitor-copy:tag1,tag2,tag3
 `,
 		Args: cobra.ExactArgs(2),
 		PreRunE: func(cmd *cobra.Command, args []string) error {
+			opts.From.RawReference = args[0]
+			refs := strings.Split(args[1], ",")
+			opts.To.RawReference = refs[0]
+			opts.extraRefs = refs[1:]
 			return option.Parse(&opts)
 		},
 		RunE: func(cmd *cobra.Command, args []string) error {
-			opts.srcRef = args[0]
-			refs := strings.Split(args[1], ",")
-			opts.dstRef = refs[0]
-			opts.extraRefs = refs[1:]
 			return runCopy(opts)
 		},
 	}
-
 	cmd.Flags().BoolVarP(&opts.recursive, "recursive", "r", false, "recursively copy the artifact and its referrer artifacts")
-	opts.src.ApplyFlagsWithPrefix(cmd.Flags(), "from", "source")
-	opts.dst.ApplyFlagsWithPrefix(cmd.Flags(), "to", "destination")
 	cmd.Flags().IntVarP(&opts.concurrency, "concurrency", "", 3, "concurrency level")
 	option.ApplyFlags(&opts, cmd.Flags())
-
 	return cmd
 }
 
 func runCopy(opts copyOptions) error {
 	ctx, _ := opts.SetLoggerLevel()
 
 	// Prepare source
-	src, err := opts.src.NewRepository(opts.srcRef, opts.Common)
+	src, err := opts.From.NewReadonlyTarget(ctx, opts.Common)
 	if err != nil {
 		return err
 	}
+	if opts.From.Reference == "" {
+		return errors.NewErrInvalidReferenceStr(opts.From.RawReference)
+	}
 
 	// Prepare destination
-	dst, err := opts.dst.NewRepository(opts.dstRef, opts.Common)
+	dst, err := opts.To.NewTarget(opts.Common)
 	if err != nil {
 		return err
 	}
@@ -121,14 +126,10 @@ func runCopy(opts copyOptions) error {
 		return display.PrintStatus(desc, "Exists ", opts.Verbose)
 	}
 
-	if src.Reference.Reference == "" {
-		return errors.NewErrInvalidReference(src.Reference)
-	}
-
 	var desc ocispec.Descriptor
-	if ref := dst.Reference.Reference; ref == "" {
+	if ref := opts.To.Reference; ref == "" {
 		// push to the destination with digest only if no tag specified
-		desc, err = src.Resolve(ctx, src.Reference.Reference)
+		desc, err = src.Resolve(ctx, opts.From.Reference)
 		if err != nil {
 			return err
 		}
@@ -139,27 +140,27 @@ func runCopy(opts copyOptions) error {
 		}
 	} else {
 		if opts.recursive {
-			desc, err = oras.ExtendedCopy(ctx, src, opts.srcRef, dst, opts.dstRef, extendedCopyOptions)
+			desc, err = oras.ExtendedCopy(ctx, src, opts.From.Reference, dst, opts.To.Reference, extendedCopyOptions)
 		} else {
 			copyOptions := oras.CopyOptions{
 				CopyGraphOptions: extendedCopyOptions.CopyGraphOptions,
 			}
 			if opts.Platform.Platform != nil {
 				copyOptions.WithTargetPlatform(opts.Platform.Platform)
 			}
-			desc, err = oras.Copy(ctx, src, opts.srcRef, dst, opts.dstRef, copyOptions)
+			desc, err = oras.Copy(ctx, src, opts.From.Reference, dst, opts.To.Reference, copyOptions)
 		}
 	}
 	if err != nil {
 		return err
 	}
 
-	fmt.Println("Copied", opts.srcRef, "=>", opts.dstRef)
+	fmt.Println("Copied", opts.From.AnnotatedReference(), "=>", opts.To.AnnotatedReference())
 
 	if len(opts.extraRefs) != 0 {
 		tagNOpts := oras.DefaultTagNOptions
 		tagNOpts.Concurrency = opts.concurrency
-		if err = oras.TagN(ctx, &display.TagManifestStatusPrinter{Repository: dst}, opts.dstRef, opts.extraRefs, tagNOpts); err != nil {
+		if _, err = oras.TagN(ctx, display.NewTagManifestStatusPrinter(dst), opts.To.Reference, opts.extraRefs, tagNOpts); err != nil {
 			return err
 		}
 	}

cmd/oras/internal/display/print.go

@@ -22,8 +22,9 @@ import (
 	"sync"
 
 	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
+	"oras.land/oras-go/v2"
 	"oras.land/oras-go/v2/content"
-	"oras.land/oras-go/v2/registry/remote"
+	"oras.land/oras-go/v2/registry"
 )
 
 var printLock sync.Mutex
@@ -74,14 +75,38 @@ func PrintSuccessorStatus(ctx context.Context, desc ocispec.Descriptor, status s
 	return nil
 }
 
-type TagManifestStatusPrinter struct {
-	*remote.Repository
+// NewTagManifestStatusPrinter creates a wrapper type for printing tag status.
+func NewTagManifestStatusPrinter(target oras.Target) oras.Target {
+	if repo, ok := target.(registry.Repository); ok {
+		return &tagManifestStatusForRepo{
+			Repository: repo,
+		}
+	}
+	return &tagManifestStatusForTarget{
+		Target: target,
+	}
+}
+
+type tagManifestStatusForRepo struct {
+	registry.Repository
 }
 
 // PushReference overrides Repository.PushReference method to print off which tag(s) were added successfully.
-func (p *TagManifestStatusPrinter) PushReference(ctx context.Context, expected ocispec.Descriptor, content io.Reader, reference string) error {
+func (p *tagManifestStatusForRepo) PushReference(ctx context.Context, expected ocispec.Descriptor, content io.Reader, reference string) error {
 	if err := p.Repository.PushReference(ctx, expected, content, reference); err != nil {
 		return err
 	}
 	return Print("Tagged", reference)
 }
+
+type tagManifestStatusForTarget struct {
+	oras.Target
+}
+
+// Tag tags a descriptor with a reference string.
+func (p *tagManifestStatusForTarget) Tag(ctx context.Context, desc ocispec.Descriptor, reference string) error {
+	if err := p.Target.Tag(ctx, desc, reference); err != nil {
+		return err
+	}
+	return Print("Tagged", reference)
+}

cmd/oras/internal/errors/errors.go

@@ -23,5 +23,10 @@ import (
 
 // NewErrInvalidReference creates a new error based on the reference string.
 func NewErrInvalidReference(ref registry.Reference) error {
+	return NewErrInvalidReferenceStr(ref.String())
+}
+
+// NewErrInvalidReferenceStr creates a new error based on the reference string.
+func NewErrInvalidReferenceStr(ref string) error {
 	return fmt.Errorf("%s: invalid image reference, expecting <name:tag|name@digest>", ref)
 }

cmd/oras/internal/fileref/unix.go

@@ -23,15 +23,15 @@ import (
 )
 
 // Parse parses file reference on unix.
-func Parse(reference string, defaultMediaType string) (filePath, mediaType string, err error) {
+func Parse(reference string, defaultMetadata string) (filePath, metadata string, err error) {
 	i := strings.LastIndex(reference, ":")
 	if i < 0 {
-		filePath, mediaType = reference, defaultMediaType
+		filePath, metadata = reference, defaultMetadata
 	} else {
-		filePath, mediaType = reference[:i], reference[i+1:]
+		filePath, metadata = reference[:i], reference[i+1:]
 	}
 	if filePath == "" {
 		return "", "", fmt.Errorf("found empty file path in %q", reference)
 	}
-	return filePath, mediaType, nil
+	return filePath, metadata, nil
 }

cmd/oras/internal/fileref/windows.go

@@ -23,24 +23,24 @@ import (
 	"unicode"
 )
 
-// Parse parses file reference on windows.
-func Parse(reference string, defaultMediaType string) (filePath, mediaType string, err error) {
-	filePath, mediaType = doParse(reference, defaultMediaType)
+// Parse parses file reference into filePath and metadata.
+func Parse(reference string, defaultMetadata string) (filePath, metadata string, err error) {
+	filePath, metadata = doParse(reference, defaultMetadata)
 	if filePath == "" {
 		return "", "", fmt.Errorf("found empty file path in %q", reference)
 	}
-	if strings.ContainsAny(filePath, `<>:"|?*`) {
+	if strings.ContainsAny(filePath, `<>"|?*`) {
 		// Reference: https://learn.microsoft.com/windows/win32/fileio/naming-a-file#naming-conventions
 		return "", "", fmt.Errorf("reserved characters found in the file path: %s", filePath)
 	}
-	return filePath, mediaType, nil
+	return filePath, metadata, nil
 }
 
-func doParse(reference string, mediaType string) (filePath, mediatype string) {
+func doParse(reference string, defaultMetadata string) (filePath, metadata string) {
 	i := strings.LastIndex(reference, ":")
 	if i < 0 || (i == 1 && len(reference) > 2 && unicode.IsLetter(rune(reference[0])) && reference[2] == '\\') {
 		// Relative file path with disk prefix is NOT supported, e.g. `c:file1`
-		return reference, mediaType
+		return reference, defaultMetadata
 	}
 	return reference[:i], reference[i+1:]
 }

cmd/oras/internal/fileref/windows_test.go

@@ -82,6 +82,8 @@ func TestParse(t *testing.T) {
 		wantMediatype string
 		wantErr       bool
 	}{
+		{"valid file name", args{`c:\some-folder\test`, ""}, `c:\some-folder\test`, "", false},
+		{"valid file name and media type", args{`c:\some-folder\test`, "type"}, `c:\some-folder\test`, "type", false},
 		{"no input", args{"", ""}, "", "", true},
 		{"empty file name", args{":", ""}, "", "", true},
 		{"reserved character1 in file name", args{"<", "a"}, "", "", true},
@@ -97,7 +99,6 @@ func TestParse(t *testing.T) {
 		{"reserved character4 in file name, with media type", args{`":`, "a"}, "", "", true},
 		{"reserved character5 in file name, with media type", args{"|:", "a"}, "", "", true},
 		{"reserved character6 in file name, with media type", args{"?:", "a"}, "", "", true},
-		{"reserved character7 in file name, with media type", args{"::", "a"}, "", "", true},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {