Tests build with local cache export

   - to detect infinite loop caused by circular dependencies

Signed-off-by: Anca Iordache <[email protected]>
Signed-off-by: Tonis Tiigi <[email protected]>

client/client_test.go

@@ -61,6 +61,7 @@ func TestIntegration(t *testing.T) {
 	mirrors := integration.WithMirroredImages(integration.OfficialImages("busybox:latest", "alpine:latest"))
 
 	integration.Run(t, []integration.Test{
+		testLocalCacheExport,
 		testRelativeWorkDir,
 		testFileOpMkdirMkfile,
 		testFileOpCopyRm,
@@ -135,6 +136,41 @@ func newContainerd(cdAddress string) (*containerd.Client, error) {
 	return containerd.New(cdAddress, containerd.WithTimeout(60*time.Second), containerd.WithDefaultRuntime("io.containerd.runtime.v1.linux"))
 }
 
+func testLocalCacheExport(t *testing.T, sb integration.Sandbox) {
+	c, err := New(context.TODO(), sb.Address())
+	require.NoError(t, err)
+	defer c.Close()
+
+	tmpdir, err := ioutil.TempDir("", "buildkit-buildctl")
+	require.NoError(t, err)
+	defer os.RemoveAll(tmpdir)
+
+	err = ioutil.WriteFile(filepath.Join(tmpdir, "foo"), []byte("foodata"), 0600)
+	require.NoError(t, err)
+
+	buildbase := llb.Image("alpine:latest").File(llb.Copy(llb.Local("mylocal"), "foo", "foo"))
+	intermed := llb.Image("alpine:latest").File(llb.Copy(buildbase, "foo", "foo"))
+	final := llb.Scratch().File(llb.Copy(intermed, "foo", "foooooo"))
+
+	def, err := final.Marshal()
+	require.NoError(t, err)
+
+	_, err = c.Solve(context.TODO(), def, SolveOpt{
+		CacheExports: []CacheOptionsEntry{
+			{
+				Type: "local",
+				Attrs: map[string]string{
+					"dest": filepath.Join(tmpdir, "cache"),
+				},
+			},
+		},
+		LocalDirs: map[string]string{
+			"mylocal": tmpdir,
+		},
+	}, nil)
+	require.NoError(t, err)
+}
+
 func testBridgeNetworking(t *testing.T, sb integration.Sandbox) {
 	if os.Getenv("BUILDKIT_RUN_NETWORK_INTEGRATION_TESTS") == "" {
 		t.SkipNow()