Implement tape pull

tape/app/app.go

@@ -74,6 +74,14 @@ func Run() int {
 				tape:                    tape,
 				InputManifestDirOptions: InputManifestDirOptions{}},
 		},
+		{
+			name:  "pull",
+			short: "Pull an artefact",
+			options: &TapePullCommand{
+				tape:                     tape,
+				OutputManifestDirOptions: OutputManifestDirOptions{},
+			},
+		},
 	}
 
 	for _, c := range commands {

tape/app/pull.go

@@ -0,0 +1,38 @@
+package app
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/docker/labs-brown-tape/oci"
+)
+
+type TapePullCommand struct {
+	tape *TapeCommand
+	OutputManifestDirOptions
+
+	Image string `short:"I" long:"image" description:"Name of the image to pull" required:"true"`
+}
+
+func (c *TapePullCommand) Execute(args []string) error {
+	ctx := context.WithValue(c.tape.ctx, "command", "pull")
+	if len(args) != 0 {
+		return fmt.Errorf("unexpected arguments: %v", args)
+	}
+
+	if err := c.tape.Init(); err != nil {
+		return err
+	}
+
+	client := oci.NewClient(nil)
+
+	artefacts, err := client.SelectArtefacts(ctx, c.Image) // oci.ContentMediaType, oci.AttestMediaType)
+	if err != nil {
+		return err
+	}
+
+	for i := range artefacts {
+		fmt.Println(artefacts[i].MediaType, artefacts[i].Annotations)
+	}
+	return nil
+}