From 6818659c1466d81abb8fdaf5d90757ebbde27bee Mon Sep 17 00:00:00 2001
From: Sam Alba <sam.alba@gmail.com>
Date: Fri, 16 Apr 2021 16:18:33 -0700
Subject: [PATCH 1/2] op: push-container stores metadata on fs, under /dagger/

Signed-off-by: Sam Alba <sam.alba@gmail.com>
---
 dagger/pipeline.go | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/dagger/pipeline.go b/dagger/pipeline.go
index c8f76b81..2778be08 100644
--- a/dagger/pipeline.go
+++ b/dagger/pipeline.go
@@ -627,7 +627,7 @@ func (p *Pipeline) PushContainer(ctx context.Context, op *compiler.Value, st llb
 	// Add the default tag "latest" to a reference if it only has a repo name.
 	ref = reference.TagNameOnly(ref)
 
-	_, err = p.s.Export(ctx, p.State(), &p.image, bk.ExportEntry{
+	resp, err := p.s.Export(ctx, p.State(), &p.image, bk.ExportEntry{
 		Type: bk.ExporterImage,
 		Attrs: map[string]string{
 			"name": ref.String(),
@@ -635,6 +635,29 @@ func (p *Pipeline) PushContainer(ctx context.Context, op *compiler.Value, st llb
 		},
 	})
 
+	if err != nil {
+		return st, err
+	}
+
+	if digest, ok := resp.ExporterResponse["containerimage.digest"]; ok {
+		imageRef := fmt.Sprintf(
+			"%s@%s",
+			resp.ExporterResponse["image.name"],
+			digest,
+		)
+
+		return 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")),
+		), nil
+	}
+
 	return st, err
 }
 

From 7d76a87ae23c7323f3144cd3287e1a914cda16d1 Mon Sep 17 00:00:00 2001
From: Sam Alba <sam.alba@gmail.com>
Date: Fri, 16 Apr 2021 16:20:27 -0700
Subject: [PATCH 2/2] examples/jamstack: implemented image_ref

Signed-off-by: Sam Alba <sam.alba@gmail.com>
---
 examples/jamstack/ecr_image.cue | 37 +++++++++++++++++++--------------
 1 file changed, 21 insertions(+), 16 deletions(-)

diff --git a/examples/jamstack/ecr_image.cue b/examples/jamstack/ecr_image.cue
index 20963737..01ce4cba 100644
--- a/examples/jamstack/ecr_image.cue
+++ b/examples/jamstack/ecr_image.cue
@@ -25,21 +25,26 @@ import (
 		target: pushTarget
 	}
 
-	push: #up: [
-		// Build the docker image
-		op.#DockerBuild & {
-			context: source
-			if dockerfilePath != _|_ {
-				"dockerfilePath": dockerfilePath
-			}
-			buildArg: buildArgs
-		},
-		// Push the image to the registry
-		op.#PushContainer & {
-			ref: pushTarget
-		},
-	]
+	ref: {
+		string
 
-	// FIXME: ref does not include the sha256: https://github.com/dagger/dagger/issues/303
-	ref: pushTarget
+		#up: [
+			// Build the docker image
+			op.#DockerBuild & {
+				context: source
+				if dockerfilePath != _|_ {
+					"dockerfilePath": dockerfilePath
+				}
+				buildArg: buildArgs
+			},
+			// Push the image to the registry
+			op.#PushContainer & {
+				ref: pushTarget
+			},
+			op.#Export & {
+				source: "/dagger/image_ref"
+				format: "string"
+			},
+		]
+	}
 }