fix digest storage (#80)

builder/docker/artifact_import.go

@@ -109,7 +109,7 @@ func (a *ImportArtifact) stateHCPPackerRegistryMetadata() interface{} {
 	img.Labels["PackerArtifactID"] = a.Id()
 	// Digest exists in state if we ran the packer push postprocessor.
 	digest, ok := data["Digest"].(string)
-	if ok {
+	if ok && digest != "" {
 		img.Labels["ImageDigest"] = digest
 	}
 

post-processor/docker-push/post-processor.go

@@ -139,18 +139,19 @@ func (p *PostProcessor) PostProcess(ctx context.Context, ui packersdk.Ui, artifa
 	// continue.
 	data := artifact.State("generated_data")
 
+	newGenData := map[string]interface{}{}
 	castData, ok := data.(map[interface{}]interface{})
 	if ok {
-		castData["Digest"] = digest
-		// The RPC turns our original map[string]interface{} into a
-		// map[interface]interface so we need to turn it back
-		newGenData := map[string]interface{}{}
 		for k, v := range castData {
 			newGenData[k.(string)] = v
 		}
-		stateData["generated_data"] = newGenData
 	}
 
+	newGenData["Digest"] = digest
+	// The RPC turns our original map[string]interface{} into a
+	// map[interface]interface so we need to turn it back
+	stateData["generated_data"] = newGenData
+
 	artifact = &docker.ImportArtifact{
 		BuilderIdValue: BuilderIdImport,
 		Driver:         driver,

post-processor/docker-tag/post-processor.go

@@ -108,13 +108,6 @@ func (p *PostProcessor) PostProcess(ctx context.Context, ui packersdk.Ui, artifa
 		}
 	}
 
-	// Store digest in state's generated data.
-	digest, err := driver.Digest(artifact.Id())
-	if err != nil {
-		err := fmt.Errorf("Error determining pushed Docker image digest")
-		ui.Error(err.Error())
-	}
-
 	// If artifact is a docker input artifact, re-store the state data.
 	// Otherwise, write what we want to the state data.
 	stateData := map[string]interface{}{"docker_tags": RepoTags}
@@ -125,7 +118,6 @@ func (p *PostProcessor) PostProcess(ctx context.Context, ui packersdk.Ui, artifa
 
 	castData, ok := data.(map[interface{}]interface{})
 	if ok {
-		castData["Digest"] = digest
 		// The RPC turns our original map[string]interface{} into a
 		// map[interface]interface so we need to turn it back
 		newGenData := map[string]interface{}{}