dockerfile: add example mount test

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

frontend/dockerfile/dockerfile_mount_test.go

@@ -0,0 +1,51 @@
+// +build dfrunmount
+
+package dockerfile
+
+import (
+	"context"
+	"os"
+	"testing"
+
+	"github.com/containerd/continuity/fs/fstest"
+	"github.com/moby/buildkit/client"
+	"github.com/moby/buildkit/frontend/dockerfile/builder"
+	"github.com/moby/buildkit/util/testutil/integration"
+	"github.com/stretchr/testify/require"
+)
+
+var mountTests = []integration.Test{
+	testMountContext,
+}
+
+func init() {
+	allTests = append(allTests, mountTests...)
+}
+
+func testMountContext(t *testing.T, sb integration.Sandbox) {
+	f := getFrontend(t, sb)
+
+	dockerfile := []byte(`
+FROM busybox
+RUN --mount=target=/context [ "$(cat /context/testfile)" == "contents0" ]
+`)
+
+	dir, err := tmpdir(
+		fstest.CreateFile("Dockerfile", dockerfile, 0600),
+		fstest.CreateFile("testfile", []byte("contents0"), 0600),
+	)
+	require.NoError(t, err)
+	defer os.RemoveAll(dir)
+
+	c, err := client.New(context.TODO(), sb.Address())
+	require.NoError(t, err)
+	defer c.Close()
+
+	_, err = f.Solve(context.TODO(), c, client.SolveOpt{
+		LocalDirs: map[string]string{
+			builder.LocalNameDockerfile: dir,
+			builder.LocalNameContext:    dir,
+		},
+	}, nil)
+	require.NoError(t, err)
+}

frontend/dockerfile/dockerfile_test.go

@@ -37,43 +37,7 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
-var opts []integration.TestOpt
-
-type frontend interface {
-	Solve(context.Context, *client.Client, client.SolveOpt, chan *client.SolveStatus) (*client.SolveResponse, error)
-	DFCmdArgs(string, string) (string, string)
-	RequiresBuildctl(t *testing.T)
-}
-
-func init() {
-	frontends := map[string]interface{}{}
-
-	opts = []integration.TestOpt{
-		integration.WithMirroredImages(integration.OfficialImages("busybox:latest")),
-		integration.WithMirroredImages(map[string]string{
-			"tonistiigi/copy:v0.1.7": "docker.io/" + dockerfile2llb.DefaultCopyImage,
-		}),
-		integration.WithMatrix("frontend", frontends),
-	}
-
-	if os.Getenv("FRONTEND_BUILTIN_ONLY") == "1" {
-		frontends["builtin"] = &builtinFrontend{}
-	} else if os.Getenv("FRONTEND_CLIENT_ONLY") == "1" {
-		frontends["client"] = &clientFrontend{}
-	} else if gw := os.Getenv("FRONTEND_GATEWAY_ONLY"); gw != "" {
-		name := "buildkit_test/" + identity.NewID() + ":latest"
-		opts = append(opts, integration.WithMirroredImages(map[string]string{
-			name: gw,
-		}))
-		frontends["gateway"] = &gatewayFrontend{gw: name}
-	} else {
-		frontends["builtin"] = &builtinFrontend{}
-		frontends["client"] = &clientFrontend{}
-	}
-}
-
-func TestIntegration(t *testing.T) {
-	integration.Run(t, []integration.Test{
+var allTests = []integration.Test{
 	testNoSnapshotLeak,
 	testCmdShell,
 	testGlobalArg,
@@ -116,7 +80,45 @@ func TestIntegration(t *testing.T) {
 	testCopyThroughSymlinkMultiStage,
 	testCopyChownCreateDest,
 	testEmptyDestDir,
-	}, opts...)
+}
+
+var opts []integration.TestOpt
+
+type frontend interface {
+	Solve(context.Context, *client.Client, client.SolveOpt, chan *client.SolveStatus) (*client.SolveResponse, error)
+	DFCmdArgs(string, string) (string, string)
+	RequiresBuildctl(t *testing.T)
+}
+
+func init() {
+	frontends := map[string]interface{}{}
+
+	opts = []integration.TestOpt{
+		integration.WithMirroredImages(integration.OfficialImages("busybox:latest")),
+		integration.WithMirroredImages(map[string]string{
+			"tonistiigi/copy:v0.1.7": "docker.io/" + dockerfile2llb.DefaultCopyImage,
+		}),
+		integration.WithMatrix("frontend", frontends),
+	}
+
+	if os.Getenv("FRONTEND_BUILTIN_ONLY") == "1" {
+		frontends["builtin"] = &builtinFrontend{}
+	} else if os.Getenv("FRONTEND_CLIENT_ONLY") == "1" {
+		frontends["client"] = &clientFrontend{}
+	} else if gw := os.Getenv("FRONTEND_GATEWAY_ONLY"); gw != "" {
+		name := "buildkit_test/" + identity.NewID() + ":latest"
+		opts = append(opts, integration.WithMirroredImages(map[string]string{
+			name: gw,
+		}))
+		frontends["gateway"] = &gatewayFrontend{gw: name}
+	} else {
+		frontends["builtin"] = &builtinFrontend{}
+		frontends["client"] = &clientFrontend{}
+	}
+}
+
+func TestIntegration(t *testing.T) {
+	integration.Run(t, allTests, opts...)
 }
 
 func testEmptyDestDir(t *testing.T, sb integration.Sandbox) {