package graph import ( "errors" "io" "io/ioutil" "os" "path" "testing" "time" "github.com/docker/docker/autogen/dockerversion" "github.com/docker/docker/daemon/graphdriver" "github.com/docker/docker/image" "github.com/docker/docker/pkg/stringid" ) func TestMount(t *testing.T) { graph, driver := tempGraph(t) defer os.RemoveAll(graph.root) defer driver.Cleanup() archive, err := fakeTar() if err != nil { t.Fatal(err) } image, err := graph.Create(archive, "", "", "Testing", "", nil, nil) if err != nil { t.Fatal(err) } tmp, err := ioutil.TempDir("", "docker-test-graph-mount-") if err != nil { t.Fatal(err) } defer os.RemoveAll(tmp) rootfs := path.Join(tmp, "rootfs") if err := os.MkdirAll(rootfs, 0700); err != nil { t.Fatal(err) } rw := path.Join(tmp, "rw") if err := os.MkdirAll(rw, 0700); err != nil { t.Fatal(err) } if _, err := driver.Get(image.ID, ""); err != nil { t.Fatal(err) } } func TestInit(t *testing.T) { graph, _ := tempGraph(t) defer nukeGraph(graph) // Root should exist if _, err := os.Stat(graph.root); err != nil { t.Fatal(err) } // Map() should be empty if l, err := graph.Map(); err != nil { t.Fatal(err) } else if len(l) != 0 { t.Fatalf("len(Map()) should return %d, not %d", 0, len(l)) } } // Test that Register can be interrupted cleanly without side effects func TestInterruptedRegister(t *testing.T) { graph, _ := tempGraph(t) defer nukeGraph(graph) badArchive, w := io.Pipe() // Use a pipe reader as a fake archive which never yields data image := &Image{ ID: stringid.GenerateRandomID(), Comment: "testing", Created: time.Now(), } w.CloseWithError(errors.New("But I'm not a tarball!")) // (Nobody's perfect, darling) graph.Register(image, badArchive) if _, err := graph.Get(image.ID); err == nil { t.Fatal("Image should not exist after Register is interrupted") } // Registering the same image again should succeed if the first register was interrupted goodArchive, err := fakeTar() if err != nil { t.Fatal(err) } if err := graph.Register(image, goodArchive); err != nil { t.Fatal(err) } } // FIXME: Do more extensive tests (ex: create multiple, delete, recreate; // create multiple, check the amount of images and paths, etc..) func TestGraphCreate(t *testing.T) { graph, _ := tempGraph(t) defer nukeGraph(graph) archive, err := fakeTar() if err != nil { t.Fatal(err) } img, err := graph.Create(archive, "", "", "Testing", "", nil, nil) if err != nil { t.Fatal(err) } if err := image.ValidateID(img.ID); err != nil { t.Fatal(err) } if img.Comment != "Testing" { t.Fatalf("Wrong comment: should be '%s', not '%s'", "Testing", img.Comment) } if img.DockerVersion != dockerversion.VERSION { t.Fatalf("Wrong docker_version: should be '%s', not '%s'", dockerversion.VERSION, img.DockerVersion) } images, err := graph.Map() if err != nil { t.Fatal(err) } else if l := len(images); l != 1 { t.Fatalf("Wrong number of images. Should be %d, not %d", 1, l) } if images[img.ID] == nil { t.Fatalf("Could not find image with id %s", img.ID) } } func TestRegister(t *testing.T) { graph, _ := tempGraph(t) defer nukeGraph(graph) archive, err := fakeTar() if err != nil { t.Fatal(err) } image := &Image{ ID: stringid.GenerateRandomID(), Comment: "testing", Created: time.Now(), } err = graph.Register(image, archive) if err != nil { t.Fatal(err) } if images, err := graph.Map(); err != nil { t.Fatal(err) } else if l := len(images); l != 1 { t.Fatalf("Wrong number of images. Should be %d, not %d", 1, l) } if resultImg, err := graph.Get(image.ID); err != nil { t.Fatal(err) } else { if resultImg.ID != image.ID { t.Fatalf("Wrong image ID. Should be '%s', not '%s'", image.ID, resultImg.ID) } if resultImg.Comment != image.Comment { t.Fatalf("Wrong image comment. Should be '%s', not '%s'", image.Comment, resultImg.Comment) } } } // Test that an image can be deleted by its shorthand prefix func TestDeletePrefix(t *testing.T) { graph, _ := tempGraph(t) defer nukeGraph(graph) img := createTestImage(graph, t) if err := graph.Delete(stringid.TruncateID(img.ID)); err != nil { t.Fatal(err) } assertNImages(graph, t, 0) } func TestDelete(t *testing.T) { graph, _ := tempGraph(t) defer nukeGraph(graph) archive, err := fakeTar() if err != nil { t.Fatal(err) } assertNImages(graph, t, 0) img, err := graph.Create(archive, "", "", "Bla bla", "", nil, nil) if err != nil { t.Fatal(err) } assertNImages(graph, t, 1) if err := graph.Delete(img.ID); err != nil { t.Fatal(err) } assertNImages(graph, t, 0) archive, err = fakeTar() if err != nil { t.Fatal(err) } // Test 2 create (same name) / 1 delete img1, err := graph.Create(archive, "", "", "Testing", "", nil, nil) if err != nil { t.Fatal(err) } archive, err = fakeTar() if err != nil { t.Fatal(err) } if _, err = graph.Create(archive, "", "", "Testing", "", nil, nil); err != nil { t.Fatal(err) } assertNImages(graph, t, 2) if err := graph.Delete(img1.ID); err != nil { t.Fatal(err) } assertNImages(graph, t, 1) // Test delete wrong name if err := graph.Delete("Not_foo"); err == nil { t.Fatalf("Deleting wrong ID should return an error") } assertNImages(graph, t, 1) archive, err = fakeTar() if err != nil { t.Fatal(err) } // Test delete twice (pull -> rm -> pull -> rm) if err := graph.Register(img1, archive); err != nil { t.Fatal(err) } if err := graph.Delete(img1.ID); err != nil { t.Fatal(err) } assertNImages(graph, t, 1) } func TestByParent(t *testing.T) { archive1, _ := fakeTar() archive2, _ := fakeTar() archive3, _ := fakeTar() graph, _ := tempGraph(t) defer nukeGraph(graph) parentImage := &Image{ ID: stringid.GenerateRandomID(), Comment: "parent", Created: time.Now(), Parent: "", } childImage1 := &Image{ ID: stringid.GenerateRandomID(), Comment: "child1", Created: time.Now(), Parent: parentImage.ID, } childImage2 := &Image{ ID: stringid.GenerateRandomID(), Comment: "child2", Created: time.Now(), Parent: parentImage.ID, } _ = graph.Register(parentImage, archive1) _ = graph.Register(childImage1, archive2) _ = graph.Register(childImage2, archive3) byParent, err := graph.ByParent() if err != nil { t.Fatal(err) } numChildren := len(byParent[parentImage.ID]) if numChildren != 2 { t.Fatalf("Expected 2 children, found %d", numChildren) } } func createTestImage(graph *Graph, t *testing.T) *Image { archive, err := fakeTar() if err != nil { t.Fatal(err) } img, err := graph.Create(archive, "", "", "Test image", "", nil, nil) if err != nil { t.Fatal(err) } return img } func assertNImages(graph *Graph, t *testing.T, n int) { if images, err := graph.Map(); err != nil { t.Fatal(err) } else if actualN := len(images); actualN != n { t.Fatalf("Expected %d images, found %d", n, actualN) } } func tempGraph(t *testing.T) (*Graph, graphdriver.Driver) { tmp, err := ioutil.TempDir("", "docker-graph-") if err != nil { t.Fatal(err) } driver, err := graphdriver.New(tmp, nil) if err != nil { t.Fatal(err) } graph, err := NewGraph(tmp, driver) if err != nil { t.Fatal(err) } return graph, driver } func nukeGraph(graph *Graph) { graph.driver.Cleanup() os.RemoveAll(graph.root) }