build: prefer local image resolution for docker driver

build/build.go

@@ -593,7 +593,10 @@ func toSolveOpt(ctx context.Context, node builder.Node, multiDriver bool, opt Op
 	}
 
 	if opt.Pull {
-		so.FrontendAttrs["image-resolve-mode"] = "pull"
+		so.FrontendAttrs["image-resolve-mode"] = pb.AttrImageResolveModeForcePull
+	} else if nodeDriver.IsMobyDriver() {
+		// moby driver always resolves local images by default
+		so.FrontendAttrs["image-resolve-mode"] = pb.AttrImageResolveModePreferLocal
 	}
 	if opt.Target != "" {
 		so.FrontendAttrs["target"] = opt.Target

tests/build.go

@@ -32,6 +32,7 @@ var buildTests = []func(t *testing.T, sb integration.Sandbox){
 	testBuildLocalExport,
 	testBuildRegistryExport,
 	testBuildTarExport,
+	testBuildMobyFromLocalImage,
 }
 
 func testBuild(t *testing.T, sb integration.Sandbox) {
@@ -139,6 +140,53 @@ func testImageIDOutput(t *testing.T, sb integration.Sandbox) {
 	require.Equal(t, dgst, digest.Digest(md.ConfigDigest))
 }
 
+func testBuildMobyFromLocalImage(t *testing.T, sb integration.Sandbox) {
+	if !isDockerWorker(sb) {
+		t.Skip("skipping test for non-docker workers")
+	}
+
+	// pull image
+	cmd := dockerCmd(sb, withArgs("pull", "-q", "busybox:latest"))
+	stdout := bytes.NewBuffer(nil)
+	cmd.Stdout = stdout
+	cmd.Stderr = os.Stderr
+	require.NoError(t, cmd.Run())
+	require.Equal(t, "docker.io/library/busybox:latest", strings.TrimSpace(stdout.String()))
+
+	// create local tag
+	cmd = dockerCmd(sb, withArgs("tag", "busybox:latest", "buildx-test:busybox"))
+	cmd.Stderr = os.Stderr
+	require.NoError(t, cmd.Run())
+
+	// build image
+	dockerfile := []byte(`FROM buildx-test:busybox`)
+	dir := tmpdir(t, fstest.CreateFile("Dockerfile", dockerfile, 0600))
+	cmd = buildxCmd(
+		sb,
+		withArgs("build", "-q", "--output=type=cacheonly", dir),
+	)
+	cmd.Stderr = os.Stderr
+	require.NoError(t, cmd.Run())
+
+	// create local tag matching a remote one
+	cmd = dockerCmd(sb, withArgs("tag", "busybox:latest", "busybox:1.36"))
+	cmd.Stderr = os.Stderr
+	require.NoError(t, cmd.Run())
+
+	// build image and check that it uses the local tag
+	dockerfile = []byte(`
+FROM busybox:1.36
+RUN busybox | head -1 | grep v1.35.0
+`)
+	dir = tmpdir(t, fstest.CreateFile("Dockerfile", dockerfile, 0600))
+	cmd = buildxCmd(
+		sb,
+		withArgs("build", "-q", "--output=type=cacheonly", dir),
+	)
+	cmd.Stderr = os.Stderr
+	require.NoError(t, cmd.Run())
+}
+
 func createTestProject(t *testing.T) string {
 	dockerfile := []byte(`
 FROM busybox:latest AS base

tests/integration.go

@@ -3,6 +3,7 @@ package tests
 import (
 	"os"
 	"os/exec"
+	"strings"
 	"testing"
 
 	"github.com/containerd/continuity/fs/fstest"
@@ -55,3 +56,20 @@ func buildxCmd(sb integration.Sandbox, opts ...cmdOpt) *exec.Cmd {
 
 	return cmd
 }
+
+func dockerCmd(sb integration.Sandbox, opts ...cmdOpt) *exec.Cmd {
+	cmd := exec.Command("docker")
+	cmd.Env = append([]string{}, os.Environ()...)
+	for _, opt := range opts {
+		opt(cmd)
+	}
+	if context := sb.DockerAddress(); context != "" {
+		cmd.Env = append(cmd.Env, "DOCKER_CONTEXT="+context)
+	}
+	return cmd
+}
+
+func isDockerWorker(sb integration.Sandbox) bool {
+	sbDriver, _, _ := strings.Cut(sb.Name(), "+")
+	return sbDriver == "docker"
+}