builder/digitalocean: implement artifacts with the snapshot name

builder/digitalocean/artifact.go

+package digitalocean
+
+import (
+	"fmt"
+)
+
+type Artifact struct {
+	// The name of the snapshot
+	snapshotName string
+}
+
+func (*Artifact) BuilderId() string {
+	return BuilderId
+}
+
+func (*Artifact) Files() []string {
+	// No files with DigitalOcean
+	return nil
+}
+
+func (a *Artifact) Id() string {
+	return a.snapshotName
+}
+
+func (a *Artifact) String() string {
+	return fmt.Sprintf("A snapshot was created: %v", a.snapshotName)
+}

builder/digitalocean/artifact_test.go

+package digitalocean
+
+import (
+	"github.com/mitchellh/packer/packer"
+	"testing"
+)
+
+func TestArtifact_Impl(t *testing.T) {
+	var raw interface{}
+	raw = &Artifact{}
+	if _, ok := raw.(packer.Artifact); !ok {
+		t.Fatalf("Artifact should be artifact")
+	}
+}
+
+func TestArtifactString(t *testing.T) {
+	a := &Artifact{"packer-foobar"}
+	expected := "A snapshot was created: packer-foobar"
+
+	if a.String() != expected {
+		t.Fatalf("artifact string should match: %v", expected)
+	}
+}

builder/digitalocean/builder.go

@@ -148,7 +148,7 @@ func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packe
 
 	b.runner.Run(state)
 
-	return nil, nil
+	return &Artifact{b.config.SnapshotName}, nil
 }
 
 func (b *Builder) Cancel() {