refactor: create tty copy handler

Signed-off-by: Terry Howe <[email protected]>

cmd/oras/internal/display/handler.go

@@ -175,6 +175,9 @@ func NewManifestPushHandler(printer *output.Printer) metadata.ManifestPushHandle
 }
 
 // NewCopyHandler returns copy handlers.
-func NewCopyHandler(printer *output.Printer, fetcher fetcher.Fetcher) (status.CopyHandler, metadata.CopyHandler) {
+func NewCopyHandler(printer *output.Printer, tty *os.File, fetcher fetcher.Fetcher) (status.CopyHandler, metadata.CopyHandler) {
+	if tty != nil {
+		return status.NewTTYCopyHandler(tty, fetcher), text.NewCopyHandler(printer)
+	}
 	return status.NewTextCopyHandler(printer, fetcher), text.NewCopyHandler(printer)
 }

cmd/oras/internal/display/status/interface.go

@@ -60,4 +60,6 @@ type CopyHandler interface {
 	PreCopy(ctx context.Context, desc ocispec.Descriptor) error
 	PostCopy(ctx context.Context, desc ocispec.Descriptor) error
 	OnMounted(ctx context.Context, desc ocispec.Descriptor) error
+	StartTracking(gt oras.GraphTarget) (oras.GraphTarget, error)
+	StopTracking()
 }

cmd/oras/internal/display/status/text.go

@@ -147,6 +147,15 @@ func NewTextCopyHandler(printer *output.Printer, fetcher content.Fetcher) CopyHa
 	}
 }
 
+// StartTracking starts a tracked target from a graph target.
+func (ch *TextCopyHandler) StartTracking(gt oras.GraphTarget) (oras.GraphTarget, error) {
+	return gt, nil
+}
+
+// StopTracking ends the copy tracking for the target.
+func (ch *TextCopyHandler) StopTracking() {
+}
+
 // OnCopySkipped is called when an object already exists.
 func (ch *TextCopyHandler) OnCopySkipped(_ context.Context, desc ocispec.Descriptor) error {
 	ch.committed.Store(desc.Digest.String(), desc.Annotations[ocispec.AnnotationTitle])

cmd/oras/internal/display/status/tty.go

@@ -143,3 +143,64 @@ func (ph *TTYPullHandler) TrackTarget(gt oras.GraphTarget) (oras.GraphTarget, St
 	ph.tracked = tracked
 	return tracked, tracked.Close, nil
 }
+
+// TTYCopyHandler handles tty status output for copy events.
+type TTYCopyHandler struct {
+	tty       *os.File
+	committed *sync.Map
+	tracked   track.GraphTarget
+	fetcher   content.Fetcher
+}
+
+// NewTTYCopyHandler returns a new handler for copy command.
+func NewTTYCopyHandler(tty *os.File, fetcher content.Fetcher) CopyHandler {
+	return &TTYCopyHandler{
+		tty:       tty,
+		fetcher:   fetcher,
+		committed: &sync.Map{},
+	}
+}
+
+// StartTracking returns a tracked target from a graph target.
+func (ch *TTYCopyHandler) StartTracking(gt oras.GraphTarget) (oras.GraphTarget, error) {
+	tracked, err := track.NewTarget(gt, copyPromptCopying, copyPromptCopied, ch.tty)
+	ch.tracked = tracked
+	return tracked, err
+}
+
+// StopTracking ends the copy tracking for the target.
+func (ch *TTYCopyHandler) StopTracking() {
+	_ = ch.tracked.Close()
+}
+
+// OnCopySkipped is called when an object already exists.
+func (ch *TTYCopyHandler) OnCopySkipped(_ context.Context, desc ocispec.Descriptor) error {
+	ch.committed.Store(desc.Digest.String(), desc.Annotations[ocispec.AnnotationTitle])
+	return ch.tracked.Prompt(desc, copyPromptExists)
+}
+
+// PreCopy implements PreCopy of CopyHandler.
+func (ch *TTYCopyHandler) PreCopy(_ context.Context, _ ocispec.Descriptor) error {
+	return nil
+}
+
+// PostCopy implements PostCopy of CopyHandler.
+func (ch *TTYCopyHandler) PostCopy(ctx context.Context, desc ocispec.Descriptor) error {
+	ch.committed.Store(desc.Digest.String(), desc.Annotations[ocispec.AnnotationTitle])
+	successors, err := graph.FilteredSuccessors(ctx, desc, ch.tracked, DeduplicatedFilter(ch.committed))
+	if err != nil {
+		return err
+	}
+	for _, successor := range successors {
+		if err = ch.tracked.Prompt(successor, copyPromptSkipped); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// OnMounted implements OnMounted of CopyHandler.
+func (ch *TTYCopyHandler) OnMounted(_ context.Context, desc ocispec.Descriptor) error {
+	ch.committed.Store(desc.Digest.String(), desc.Annotations[ocispec.AnnotationTitle])
+	return ch.tracked.Prompt(desc, copyPromptMounted)
+}

cmd/oras/root/cp.go

@@ -19,11 +19,9 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
-	"oras.land/oras/cmd/oras/internal/display/status"
 	"slices"
 	"strings"
-	"sync"
-
+
 	"github.com/opencontainers/go-digest"
 	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/spf13/cobra"
@@ -35,7 +33,7 @@ import (
 	"oras.land/oras/cmd/oras/internal/argument"
 	"oras.land/oras/cmd/oras/internal/command"
 	"oras.land/oras/cmd/oras/internal/display"
-	"oras.land/oras/cmd/oras/internal/display/status/track"
+	"oras.land/oras/cmd/oras/internal/display/status"
 	oerrors "oras.land/oras/cmd/oras/internal/errors"
 	"oras.land/oras/cmd/oras/internal/option"
 	"oras.land/oras/internal/docker"
@@ -127,7 +125,7 @@ func runCopy(cmd *cobra.Command, opts *copyOptions) error {
 		return err
 	}
 	ctx = registryutil.WithScopeHint(ctx, dst, auth.ActionPull, auth.ActionPush)
-	copyHandler, handler := display.NewCopyHandler(opts.Printer, dst)
+	copyHandler, handler := display.NewCopyHandler(opts.Printer, opts.TTY, dst)
 
 	desc, err := doCopy(ctx, copyHandler, src, dst, opts)
 	if err != nil {
@@ -154,68 +152,31 @@ func runCopy(cmd *cobra.Command, opts *copyOptions) error {
 	return nil
 }
 
-func doCopy(ctx context.Context, copyHandler status.CopyHandler, src oras.ReadOnlyGraphTarget, dst oras.GraphTarget, opts *copyOptions) (ocispec.Descriptor, error) {
+func doCopy(ctx context.Context, copyHandler status.CopyHandler, src oras.ReadOnlyGraphTarget, dst oras.GraphTarget, opts *copyOptions) (desc ocispec.Descriptor, err error) {
 	// Prepare copy options
-	committed := &sync.Map{}
 	extendedCopyOptions := oras.DefaultExtendedCopyOptions
 	extendedCopyOptions.Concurrency = opts.concurrency
 	extendedCopyOptions.FindPredecessors = func(ctx context.Context, src content.ReadOnlyGraphStorage, desc ocispec.Descriptor) ([]ocispec.Descriptor, error) {
 		return registry.Referrers(ctx, src, desc, "")
 	}
 
-	const (
-		promptExists  = "Exists "
-		promptCopying = "Copying"
-		promptCopied  = "Copied "
-		promptSkipped = "Skipped"
-		promptMounted = "Mounted"
-	)
 	srcRepo, srcIsRemote := src.(*remote.Repository)
 	dstRepo, dstIsRemote := dst.(*remote.Repository)
 	if srcIsRemote && dstIsRemote && srcRepo.Reference.Registry == dstRepo.Reference.Registry {
 		extendedCopyOptions.MountFrom = func(ctx context.Context, desc ocispec.Descriptor) ([]string, error) {
 			return []string{srcRepo.Reference.Repository}, nil
 		}
 	}
-	if opts.TTY == nil {
-		// no TTY output
-		extendedCopyOptions.OnCopySkipped = copyHandler.OnCopySkipped
-		extendedCopyOptions.PreCopy = copyHandler.PreCopy
-		extendedCopyOptions.PostCopy = copyHandler.PostCopy
-		extendedCopyOptions.OnMounted = copyHandler.OnMounted
-	} else {
-		// TTY output
-		tracked, err := track.NewTarget(dst, promptCopying, promptCopied, opts.TTY)
-		if err != nil {
-			return ocispec.Descriptor{}, err
-		}
-		defer tracked.Close()
-		dst = tracked
-		extendedCopyOptions.OnCopySkipped = func(ctx context.Context, desc ocispec.Descriptor) error {
-			committed.Store(desc.Digest.String(), desc.Annotations[ocispec.AnnotationTitle])
-			return tracked.Prompt(desc, promptExists)
-		}
-		extendedCopyOptions.PostCopy = func(ctx context.Context, desc ocispec.Descriptor) error {
-			committed.Store(desc.Digest.String(), desc.Annotations[ocispec.AnnotationTitle])
-			successors, err := graph.FilteredSuccessors(ctx, desc, tracked, status.DeduplicatedFilter(committed))
-			if err != nil {
-				return err
-			}
-			for _, successor := range successors {
-				if err = tracked.Prompt(successor, promptSkipped); err != nil {
-					return err
-				}
-			}
-			return nil
-		}
-		extendedCopyOptions.OnMounted = func(ctx context.Context, desc ocispec.Descriptor) error {
-			committed.Store(desc.Digest.String(), desc.Annotations[ocispec.AnnotationTitle])
-			return tracked.Prompt(desc, promptMounted)
-		}
+	dst, err = copyHandler.StartTracking(dst)
+	if err != nil {
+		return desc, err
 	}
+	defer copyHandler.StopTracking()
+	extendedCopyOptions.OnCopySkipped = copyHandler.OnCopySkipped
+	extendedCopyOptions.PreCopy = copyHandler.PreCopy
+	extendedCopyOptions.PostCopy = copyHandler.PostCopy
+	extendedCopyOptions.OnMounted = copyHandler.OnMounted
 
-	var desc ocispec.Descriptor
-	var err error
 	rOpts := oras.DefaultResolveOptions
 	rOpts.TargetPlatform = opts.Platform.Platform
 	if opts.recursive {