only look for required image in bake metadata

pkg/compose/build_bake.go

@@ -140,11 +140,10 @@
 		Targets: map[string]bakeTarget{},
 	}
 	var (
-		group          bakeGroup
-		privileged     bool
-		read           []string
-		expectedImages = make(map[string]string, len(serviceToBeBuild)) // service name -> expected image
-		targets        = make(map[string]string, len(serviceToBeBuild)) // service name -> build target
+		group      bakeGroup
+		privileged bool
+		read       []string
+		targets    = make(map[string]string, len(serviceToBeBuild)) // service name -> build target
 	)
 
 	// produce a unique ID for service used as bake target
@@ -173,9 +172,6 @@
 			args[k] = *v
 		}
 
-		image := api.GetImageNameOrDefault(service, project.Name)
-		expectedImages[serviceName] = image
-
 		entitlements := build.Entitlements
 		if slices.Contains(build.Entitlements, "security.insecure") {
 			privileged = true
@@ -213,7 +209,7 @@
 			DockerfileInline: strings.ReplaceAll(build.DockerfileInline, "${", "$${"),
 			Args:             args,
 			Labels:           build.Labels,
-			Tags:             append(build.Tags, image),
+			Tags:             append(build.Tags, api.GetImageNameOrDefault(service, project.Name)),
 
 			CacheFrom: build.CacheFrom,
 			// CacheTo:    TODO
@@ -360,10 +356,11 @@
 
 	cw := progress.ContextWriter(ctx)
 	results := map[string]string{}
-	for service, name := range expectedImages {
-		built, ok := md[targets[service]]
+	for name := range serviceToBeBuild {
+		target := targets[name]
+		built, ok := md[target]
 		if !ok {
-			return nil, fmt.Errorf("build result not found in Bake metadata for service %s", service)
+			return nil, fmt.Errorf("build result not found in Bake metadata for service %s", name)
 		}
 		results[name] = built.Digest
 		cw.Event(progress.BuiltEvent(name))

pkg/e2e/build_test.go

@@ -536,3 +536,31 @@ func TestBuildDependsOn(t *testing.T) {
 	out := res.Combined()
 	assert.Check(t, strings.Contains(out, "test1  Built"))
 }
+
+func TestBuildSubset(t *testing.T) {
+	c := NewParallelCLI(t)
+
+	t.Cleanup(func() {
+		c.RunDockerComposeCmd(t, "-f", "fixtures/build-test/subset/compose.yaml", "down", "--rmi=local")
+	})
+
+	res := c.RunDockerComposeCmd(t, "-f", "fixtures/build-test/subset/compose.yaml", "build", "main")
+	out := res.Combined()
+	assert.Check(t, strings.Contains(out, "main  Built"))
+}
+
+func TestBuildDependentImage(t *testing.T) {
+	c := NewParallelCLI(t)
+
+	t.Cleanup(func() {
+		c.RunDockerComposeCmd(t, "-f", "fixtures/build-test/dependencies/compose.yaml", "down", "--rmi=local")
+	})
+
+	res := c.RunDockerComposeCmd(t, "-f", "fixtures/build-test/dependencies/compose.yaml", "build", "firstbuild")
+	out := res.Combined()
+	assert.Check(t, strings.Contains(out, "firstbuild  Built"))
+
+	res = c.RunDockerComposeCmd(t, "-f", "fixtures/build-test/dependencies/compose.yaml", "build", "secondbuild")
+	out = res.Combined()
+	assert.Check(t, strings.Contains(out, "secondbuild  Built"))
+}

pkg/e2e/fixtures/build-test/dependencies/compose.yaml

@@ -0,0 +1,26 @@
+services:
+  firstbuild:
+    build:
+      dockerfile_inline: |
+        FROM alpine
+      additional_contexts:
+        dep1: service:dep1
+    entrypoint: ["echo", "Hello from firstbuild"]
+    depends_on:
+      - dep1
+
+  secondbuild:
+    build:
+      dockerfile_inline: |
+        FROM alpine
+      additional_contexts:
+        dep1: service:dep1
+    entrypoint: ["echo", "Hello from secondbuild"]
+    depends_on:
+      - dep1
+
+  dep1:
+    build:
+      dockerfile_inline: |
+        FROM alpine
+    entrypoint: ["echo", "Hello from dep1"]

pkg/e2e/fixtures/build-test/subset/compose.yaml

@@ -0,0 +1,14 @@
+services:
+  main:
+    build:
+      dockerfile_inline: |
+        FROM alpine
+    entrypoint: ["echo", "Hello from main"]
+    depends_on:
+      - dep1
+
+  dep1:
+    build:
+      dockerfile_inline: |
+        FROM alpine
+    entrypoint: ["echo", "Hello from dep1"]