Rewrite cp

Signed-off-by: apostasie <spam_blackhole@farcloser.world>

Author: apostasie

cmd/nerdctl/container/container_cp_linux.go

@@ -115,16 +115,16 @@ func processCpOptions(cmd *cobra.Command, args []string) (types.ContainerCpOptio
 	}
 
 	container2host := srcSpec.Container != nil
-	var container string
+	var containerReq string
 	if container2host {
-		container = *srcSpec.Container
+		containerReq = *srcSpec.Container
 	} else {
-		container = *destSpec.Container
+		containerReq = *destSpec.Container
 	}
 	return types.ContainerCpOptions{
 		GOptions:       globalOptions,
 		Container2Host: container2host,
-		ContainerReq:   container,
+		ContainerReq:   containerReq,
 		DestPath:       destSpec.Path,
 		SrcPath:        srcSpec.Path,
 		FollowSymLink:  flagL,

pkg/cmd/container/cp_linux.go

@@ -39,17 +39,22 @@ func Cp(ctx context.Context, client *containerd.Client, options types.ContainerC
 				ctx,
 				client,
 				found.Container,
-				options.Container2Host,
-				options.DestPath,
-				options.SrcPath,
-				options.GOptions.Snapshotter,
-				options.FollowSymLink)
+				options)
 		},
 	}
 	count, err := walker.Walk(ctx, options.ContainerReq)
 
-	if count < 1 {
-		err = fmt.Errorf("could not find container: %s, with error: %w", options.ContainerReq, err)
+	if count == -1 {
+		if err == nil {
+			panic("nil error and count == -1 from ContainerWalker.Walk should never happen")
+		}
+		err = fmt.Errorf("unable to copy: %w", err)
+	} else if count == 0 {
+		if err != nil {
+			err = fmt.Errorf("unable to retrieve containers with error: %w", err)
+		} else {
+			err = fmt.Errorf("no container found for: %s", options.ContainerReq)
+		}
 	}
 
 	return err