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moby--moby/graph_test.go

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package docker
import (
"archive/tar"
"bytes"
"errors"
"io"
"io/ioutil"
"os"
"path"
"testing"
"time"
)
func TestInit(t *testing.T) {
graph := tempGraph(t)
defer os.RemoveAll(graph.Root)
// Root should exist
if _, err := os.Stat(graph.Root); err != nil {
t.Fatal(err)
}
// All() should be empty
if l, err := graph.All(); err != nil {
t.Fatal(err)
} else if len(l) != 0 {
t.Fatalf("List() 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 os.RemoveAll(graph.Root)
badArchive, w := io.Pipe() // Use a pipe reader as a fake archive which never yields data
image := &Image{
Id: GenerateId(),
Comment: "testing",
Created: time.Now(),
}
go graph.Register(badArchive, image)
time.Sleep(200 * time.Millisecond)
w.CloseWithError(errors.New("But I'm not a tarball!")) // (Nobody's perfect, darling)
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(goodArchive, image); 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..)
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func TestGraphCreate(t *testing.T) {
graph := tempGraph(t)
defer os.RemoveAll(graph.Root)
archive, err := fakeTar()
if err != nil {
t.Fatal(err)
}
image, err := graph.Create(archive, nil, "Testing", "")
if err != nil {
t.Fatal(err)
}
if err := ValidateId(image.Id); err != nil {
t.Fatal(err)
}
if image.Comment != "Testing" {
t.Fatalf("Wrong comment: should be '%s', not '%s'", "Testing", image.Comment)
}
if image.DockerVersion != VERSION {
t.Fatalf("Wrong docker_version: should be '%s', not '%s'", VERSION, image.DockerVersion)
}
if images, err := graph.All(); 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)
}
}
func TestRegister(t *testing.T) {
graph := tempGraph(t)
defer os.RemoveAll(graph.Root)
archive, err := fakeTar()
if err != nil {
t.Fatal(err)
}
image := &Image{
Id: GenerateId(),
Comment: "testing",
Created: time.Now(),
}
err = graph.Register(archive, image)
if err != nil {
t.Fatal(err)
}
if images, err := graph.All(); 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)
}
}
}
func TestMount(t *testing.T) {
graph := tempGraph(t)
defer os.RemoveAll(graph.Root)
archive, err := fakeTar()
if err != nil {
t.Fatal(err)
}
image, err := graph.Create(archive, nil, "Testing", "")
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 := image.Mount(rootfs, rw); err != nil {
t.Fatal(err)
}
// FIXME: test for mount contents
defer func() {
if err := Unmount(rootfs); err != nil {
t.Error(err)
}
}()
}
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// Test that an image can be deleted by its shorthand prefix
func TestDeletePrefix(t *testing.T) {
graph := tempGraph(t)
defer os.RemoveAll(graph.Root)
img := createTestImage(graph, t)
if err := graph.Delete(TruncateId(img.Id)); err != nil {
t.Fatal(err)
}
assertNImages(graph, t, 0)
}
func createTestImage(graph *Graph, t *testing.T) *Image {
archive, err := fakeTar()
if err != nil {
t.Fatal(err)
}
img, err := graph.Create(archive, nil, "Test image", "")
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if err != nil {
t.Fatal(err)
}
return img
}
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func TestDelete(t *testing.T) {
graph := tempGraph(t)
defer os.RemoveAll(graph.Root)
archive, err := fakeTar()
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if err != nil {
t.Fatal(err)
}
assertNImages(graph, t, 0)
img, err := graph.Create(archive, nil, "Bla bla", "")
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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)
// Test 2 create (same name) / 1 delete
img1, err := graph.Create(archive, nil, "Testing", "")
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if err != nil {
t.Fatal(err)
}
if _, err = graph.Create(archive, nil, "Testing", ""); err != nil {
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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)
// Test delete twice (pull -> rm -> pull -> rm)
if err := graph.Register(archive, img1); err != nil {
t.Fatal(err)
}
if err := graph.Delete(img1.Id); err != nil {
t.Fatal(err)
}
assertNImages(graph, t, 1)
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}
func assertNImages(graph *Graph, t *testing.T, n int) {
if images, err := graph.All(); err != nil {
t.Fatal(err)
} else if actualN := len(images); actualN != n {
t.Fatalf("Expected %d images, found %d", n, actualN)
}
}
/*
* HELPER FUNCTIONS
*/
func tempGraph(t *testing.T) *Graph {
tmp, err := ioutil.TempDir("", "docker-graph-")
if err != nil {
t.Fatal(err)
}
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graph, err := NewGraph(tmp)
if err != nil {
t.Fatal(err)
}
return graph
}
func testArchive(t *testing.T) Archive {
archive, err := fakeTar()
if err != nil {
t.Fatal(err)
}
return archive
}
func fakeTar() (io.Reader, error) {
content := []byte("Hello world!\n")
buf := new(bytes.Buffer)
tw := tar.NewWriter(buf)
for _, name := range []string{"/etc/postgres/postgres.conf", "/etc/passwd", "/var/log/postgres/postgres.conf"} {
hdr := new(tar.Header)
hdr.Size = int64(len(content))
hdr.Name = name
if err := tw.WriteHeader(hdr); err != nil {
return nil, err
}
tw.Write([]byte(content))
}
tw.Close()
return buf, nil
}