op.#SaveImage: export the image ID

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>

docs/reference/docker/README.md

@@ -57,8 +57,7 @@ Load a docker image into a docker engine
 
 | Name             | Type              | Description        |
 | -------------    |:-------------:    |:-------------:     |
-|*ref*             | `string`          |Image ref           |
-|*digest*          | `string`          |Image digest        |
+|*id*              | `string`          |Image ID            |
 
 ## docker.#Pull
 

environment/pipeline.go

@@ -914,22 +914,13 @@ func (p *Pipeline) SaveImage(ctx context.Context, op *compiler.Value, st llb.Sta
 		return st, err
 	}
 
-	if digest, ok := resp.ExporterResponse["containerimage.digest"]; ok {
-		imageRef := fmt.Sprintf(
-			"%s@%s",
-			resp.ExporterResponse["image.name"],
-			digest,
-		)
-
+	if id, ok := resp.ExporterResponse["containerimage.config.digest"]; ok {
 		st = st.File(
 			llb.Mkdir("/dagger", fs.FileMode(0755)),
 			llb.WithCustomName(p.vertexNamef("Mkdir /dagger")),
 		).File(
-			llb.Mkfile("/dagger/image_digest", fs.FileMode(0644), []byte(digest)),
-			llb.WithCustomName(p.vertexNamef("Storing image digest to /dagger/image_digest")),
-		).File(
-			llb.Mkfile("/dagger/image_ref", fs.FileMode(0644), []byte(imageRef)),
-			llb.WithCustomName(p.vertexNamef("Storing image ref to /dagger/image_ref")),
+			llb.Mkfile("/dagger/image_id", fs.FileMode(0644), []byte(id)),
+			llb.WithCustomName(p.vertexNamef("Storing image id to /dagger/image_id")),
 		)
 	}
 

stdlib/docker/docker.cue

@@ -155,28 +155,15 @@ import (
 		command: "docker load -i /src/image.tar"
 	}
 
-	// Image ref
-	ref: {
+	// Image ID
+	id: {
 		string
 
 		#up: [
 			op.#Load & {from: save},
 
 			op.#Export & {
-				source: "/dagger/image_ref"
-			},
-		]
-	} & dagger.#Output
-
-	// Image digest
-	digest: {
-		string
-
-		#up: [
-			op.#Load & {from: save},
-
-			op.#Export & {
-				source: "/dagger/image_digest"
+				source: "/dagger/image_id"
 			},
 		]
 	} & dagger.#Output