mirror of https://github.com/docker/docs.git
769 lines
17 KiB
Go
769 lines
17 KiB
Go
package layer
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import (
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"bytes"
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"io"
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"io/ioutil"
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"os"
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"path/filepath"
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"runtime"
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"strings"
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"testing"
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"github.com/docker/distribution/digest"
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"github.com/docker/docker/daemon/graphdriver"
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"github.com/docker/docker/daemon/graphdriver/vfs"
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"github.com/docker/docker/pkg/archive"
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"github.com/docker/docker/pkg/idtools"
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"github.com/docker/docker/pkg/stringid"
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)
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func init() {
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graphdriver.ApplyUncompressedLayer = archive.UnpackLayer
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vfs.CopyWithTar = archive.CopyWithTar
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}
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func newVFSGraphDriver(td string) (graphdriver.Driver, error) {
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uidMap := []idtools.IDMap{
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{
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ContainerID: 0,
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HostID: os.Getuid(),
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Size: 1,
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},
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}
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gidMap := []idtools.IDMap{
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{
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ContainerID: 0,
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HostID: os.Getgid(),
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Size: 1,
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},
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}
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return graphdriver.GetDriver("vfs", td, nil, uidMap, gidMap)
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}
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func newTestGraphDriver(t *testing.T) (graphdriver.Driver, func()) {
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td, err := ioutil.TempDir("", "graph-")
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if err != nil {
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t.Fatal(err)
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}
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driver, err := newVFSGraphDriver(td)
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if err != nil {
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t.Fatal(err)
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}
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return driver, func() {
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os.RemoveAll(td)
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}
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}
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func newTestStore(t *testing.T) (Store, string, func()) {
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td, err := ioutil.TempDir("", "layerstore-")
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if err != nil {
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t.Fatal(err)
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}
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graph, graphcleanup := newTestGraphDriver(t)
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fms, err := NewFSMetadataStore(td)
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if err != nil {
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t.Fatal(err)
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}
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ls, err := NewStoreFromGraphDriver(fms, graph)
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if err != nil {
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t.Fatal(err)
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}
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return ls, td, func() {
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graphcleanup()
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os.RemoveAll(td)
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}
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}
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type layerInit func(root string) error
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func createLayer(ls Store, parent ChainID, layerFunc layerInit) (Layer, error) {
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containerID := stringid.GenerateRandomID()
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mount, err := ls.CreateRWLayer(containerID, parent, "", nil, nil)
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if err != nil {
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return nil, err
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}
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path, err := mount.Mount("")
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if err != nil {
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return nil, err
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}
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if err := layerFunc(path); err != nil {
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return nil, err
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}
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ts, err := mount.TarStream()
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if err != nil {
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return nil, err
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}
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defer ts.Close()
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layer, err := ls.Register(ts, parent)
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if err != nil {
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return nil, err
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}
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if err := mount.Unmount(); err != nil {
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return nil, err
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}
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if _, err := ls.ReleaseRWLayer(mount); err != nil {
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return nil, err
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}
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return layer, nil
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}
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type FileApplier interface {
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ApplyFile(root string) error
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}
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type testFile struct {
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name string
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content []byte
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permission os.FileMode
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}
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func newTestFile(name string, content []byte, perm os.FileMode) FileApplier {
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return &testFile{
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name: name,
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content: content,
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permission: perm,
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}
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}
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func (tf *testFile) ApplyFile(root string) error {
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fullPath := filepath.Join(root, tf.name)
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if err := os.MkdirAll(filepath.Dir(fullPath), 0755); err != nil {
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return err
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}
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// Check if already exists
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if stat, err := os.Stat(fullPath); err == nil && stat.Mode().Perm() != tf.permission {
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if err := os.Chmod(fullPath, tf.permission); err != nil {
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return err
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}
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}
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if err := ioutil.WriteFile(fullPath, tf.content, tf.permission); err != nil {
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return err
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}
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return nil
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}
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func initWithFiles(files ...FileApplier) layerInit {
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return func(root string) error {
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for _, f := range files {
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if err := f.ApplyFile(root); err != nil {
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return err
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}
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}
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return nil
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}
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}
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func getCachedLayer(l Layer) *roLayer {
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if rl, ok := l.(*referencedCacheLayer); ok {
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return rl.roLayer
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}
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return l.(*roLayer)
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}
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func getMountLayer(l RWLayer) *mountedLayer {
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return l.(*referencedRWLayer).mountedLayer
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}
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func createMetadata(layers ...Layer) []Metadata {
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metadata := make([]Metadata, len(layers))
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for i := range layers {
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size, err := layers[i].Size()
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if err != nil {
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panic(err)
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}
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metadata[i].ChainID = layers[i].ChainID()
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metadata[i].DiffID = layers[i].DiffID()
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metadata[i].Size = size
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metadata[i].DiffSize = getCachedLayer(layers[i]).size
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}
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return metadata
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}
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func assertMetadata(t *testing.T, metadata, expectedMetadata []Metadata) {
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if len(metadata) != len(expectedMetadata) {
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t.Fatalf("Unexpected number of deletes %d, expected %d", len(metadata), len(expectedMetadata))
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}
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for i := range metadata {
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if metadata[i] != expectedMetadata[i] {
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t.Errorf("Unexpected metadata\n\tExpected: %#v\n\tActual: %#v", expectedMetadata[i], metadata[i])
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}
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}
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if t.Failed() {
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t.FailNow()
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}
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}
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func releaseAndCheckDeleted(t *testing.T, ls Store, layer Layer, removed ...Layer) {
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layerCount := len(ls.(*layerStore).layerMap)
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expectedMetadata := createMetadata(removed...)
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metadata, err := ls.Release(layer)
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if err != nil {
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t.Fatal(err)
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}
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assertMetadata(t, metadata, expectedMetadata)
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if expected := layerCount - len(removed); len(ls.(*layerStore).layerMap) != expected {
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t.Fatalf("Unexpected number of layers %d, expected %d", len(ls.(*layerStore).layerMap), expected)
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}
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}
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func cacheID(l Layer) string {
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return getCachedLayer(l).cacheID
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}
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func assertLayerEqual(t *testing.T, l1, l2 Layer) {
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if l1.ChainID() != l2.ChainID() {
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t.Fatalf("Mismatched ID: %s vs %s", l1.ChainID(), l2.ChainID())
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}
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if l1.DiffID() != l2.DiffID() {
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t.Fatalf("Mismatched DiffID: %s vs %s", l1.DiffID(), l2.DiffID())
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}
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size1, err := l1.Size()
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if err != nil {
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t.Fatal(err)
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}
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size2, err := l2.Size()
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if err != nil {
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t.Fatal(err)
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}
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if size1 != size2 {
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t.Fatalf("Mismatched size: %d vs %d", size1, size2)
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}
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if cacheID(l1) != cacheID(l2) {
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t.Fatalf("Mismatched cache id: %s vs %s", cacheID(l1), cacheID(l2))
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}
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p1 := l1.Parent()
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p2 := l2.Parent()
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if p1 != nil && p2 != nil {
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assertLayerEqual(t, p1, p2)
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} else if p1 != nil || p2 != nil {
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t.Fatalf("Mismatched parents: %v vs %v", p1, p2)
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}
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}
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func TestMountAndRegister(t *testing.T) {
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ls, _, cleanup := newTestStore(t)
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defer cleanup()
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li := initWithFiles(newTestFile("testfile.txt", []byte("some test data"), 0644))
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layer, err := createLayer(ls, "", li)
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if err != nil {
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t.Fatal(err)
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}
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size, _ := layer.Size()
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t.Logf("Layer size: %d", size)
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mount2, err := ls.CreateRWLayer("new-test-mount", layer.ChainID(), "", nil, nil)
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if err != nil {
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t.Fatal(err)
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}
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path2, err := mount2.Mount("")
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if err != nil {
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t.Fatal(err)
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}
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b, err := ioutil.ReadFile(filepath.Join(path2, "testfile.txt"))
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if err != nil {
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t.Fatal(err)
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}
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if expected := "some test data"; string(b) != expected {
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t.Fatalf("Wrong file data, expected %q, got %q", expected, string(b))
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}
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if err := mount2.Unmount(); err != nil {
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t.Fatal(err)
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}
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if _, err := ls.ReleaseRWLayer(mount2); err != nil {
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t.Fatal(err)
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}
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}
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func TestLayerRelease(t *testing.T) {
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// TODO Windows: Figure out why this is failing
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if runtime.GOOS == "windows" {
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t.Skip("Failing on Windows")
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}
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ls, _, cleanup := newTestStore(t)
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defer cleanup()
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layer1, err := createLayer(ls, "", initWithFiles(newTestFile("layer1.txt", []byte("layer 1 file"), 0644)))
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if err != nil {
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t.Fatal(err)
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}
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layer2, err := createLayer(ls, layer1.ChainID(), initWithFiles(newTestFile("layer2.txt", []byte("layer 2 file"), 0644)))
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if err != nil {
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t.Fatal(err)
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}
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if _, err := ls.Release(layer1); err != nil {
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t.Fatal(err)
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}
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layer3a, err := createLayer(ls, layer2.ChainID(), initWithFiles(newTestFile("layer3.txt", []byte("layer 3a file"), 0644)))
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if err != nil {
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t.Fatal(err)
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}
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layer3b, err := createLayer(ls, layer2.ChainID(), initWithFiles(newTestFile("layer3.txt", []byte("layer 3b file"), 0644)))
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if err != nil {
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t.Fatal(err)
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}
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if _, err := ls.Release(layer2); err != nil {
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t.Fatal(err)
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}
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t.Logf("Layer1: %s", layer1.ChainID())
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t.Logf("Layer2: %s", layer2.ChainID())
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t.Logf("Layer3a: %s", layer3a.ChainID())
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t.Logf("Layer3b: %s", layer3b.ChainID())
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if expected := 4; len(ls.(*layerStore).layerMap) != expected {
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t.Fatalf("Unexpected number of layers %d, expected %d", len(ls.(*layerStore).layerMap), expected)
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}
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releaseAndCheckDeleted(t, ls, layer3b, layer3b)
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releaseAndCheckDeleted(t, ls, layer3a, layer3a, layer2, layer1)
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}
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func TestStoreRestore(t *testing.T) {
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// TODO Windows: Figure out why this is failing
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if runtime.GOOS == "windows" {
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t.Skip("Failing on Windows")
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}
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ls, _, cleanup := newTestStore(t)
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defer cleanup()
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layer1, err := createLayer(ls, "", initWithFiles(newTestFile("layer1.txt", []byte("layer 1 file"), 0644)))
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if err != nil {
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t.Fatal(err)
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}
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layer2, err := createLayer(ls, layer1.ChainID(), initWithFiles(newTestFile("layer2.txt", []byte("layer 2 file"), 0644)))
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if err != nil {
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t.Fatal(err)
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}
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if _, err := ls.Release(layer1); err != nil {
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t.Fatal(err)
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}
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layer3, err := createLayer(ls, layer2.ChainID(), initWithFiles(newTestFile("layer3.txt", []byte("layer 3 file"), 0644)))
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if err != nil {
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t.Fatal(err)
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}
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if _, err := ls.Release(layer2); err != nil {
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t.Fatal(err)
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}
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m, err := ls.CreateRWLayer("some-mount_name", layer3.ChainID(), "", nil, nil)
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if err != nil {
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t.Fatal(err)
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}
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path, err := m.Mount("")
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if err != nil {
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t.Fatal(err)
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}
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if err := ioutil.WriteFile(filepath.Join(path, "testfile.txt"), []byte("nothing here"), 0644); err != nil {
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t.Fatal(err)
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}
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if err := m.Unmount(); err != nil {
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t.Fatal(err)
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}
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ls2, err := NewStoreFromGraphDriver(ls.(*layerStore).store, ls.(*layerStore).driver)
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if err != nil {
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t.Fatal(err)
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}
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layer3b, err := ls2.Get(layer3.ChainID())
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if err != nil {
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t.Fatal(err)
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}
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assertLayerEqual(t, layer3b, layer3)
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// Create again with same name, should return error
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if _, err := ls2.CreateRWLayer("some-mount_name", layer3b.ChainID(), "", nil, nil); err == nil {
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t.Fatal("Expected error creating mount with same name")
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} else if err != ErrMountNameConflict {
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t.Fatal(err)
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}
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m2, err := ls2.GetRWLayer("some-mount_name")
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if err != nil {
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t.Fatal(err)
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}
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if mountPath, err := m2.Mount(""); err != nil {
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t.Fatal(err)
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} else if path != mountPath {
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t.Fatalf("Unexpected path %s, expected %s", mountPath, path)
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}
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if mountPath, err := m2.Mount(""); err != nil {
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t.Fatal(err)
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} else if path != mountPath {
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t.Fatalf("Unexpected path %s, expected %s", mountPath, path)
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}
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if err := m2.Unmount(); err != nil {
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t.Fatal(err)
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}
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b, err := ioutil.ReadFile(filepath.Join(path, "testfile.txt"))
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if err != nil {
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t.Fatal(err)
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}
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if expected := "nothing here"; string(b) != expected {
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t.Fatalf("Unexpected content %q, expected %q", string(b), expected)
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}
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if err := m2.Unmount(); err != nil {
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t.Fatal(err)
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}
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if metadata, err := ls2.ReleaseRWLayer(m2); err != nil {
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t.Fatal(err)
|
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} else if len(metadata) != 0 {
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t.Fatalf("Unexpectedly deleted layers: %#v", metadata)
|
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}
|
|
|
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if metadata, err := ls2.ReleaseRWLayer(m2); err != nil {
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t.Fatal(err)
|
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} else if len(metadata) != 0 {
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t.Fatalf("Unexpectedly deleted layers: %#v", metadata)
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}
|
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|
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releaseAndCheckDeleted(t, ls2, layer3b, layer3, layer2, layer1)
|
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}
|
|
|
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func TestTarStreamStability(t *testing.T) {
|
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// TODO Windows: Figure out why this is failing
|
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if runtime.GOOS == "windows" {
|
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t.Skip("Failing on Windows")
|
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}
|
|
ls, _, cleanup := newTestStore(t)
|
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defer cleanup()
|
|
|
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files1 := []FileApplier{
|
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newTestFile("/etc/hosts", []byte("mydomain 10.0.0.1"), 0644),
|
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newTestFile("/etc/profile", []byte("PATH=/usr/bin"), 0644),
|
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}
|
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addedFile := newTestFile("/etc/shadow", []byte("root:::::::"), 0644)
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files2 := []FileApplier{
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newTestFile("/etc/hosts", []byte("mydomain 10.0.0.2"), 0644),
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newTestFile("/etc/profile", []byte("PATH=/usr/bin"), 0664),
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newTestFile("/root/.bashrc", []byte("PATH=/usr/sbin:/usr/bin"), 0644),
|
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}
|
|
|
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tar1, err := tarFromFiles(files1...)
|
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if err != nil {
|
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t.Fatal(err)
|
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}
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|
|
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tar2, err := tarFromFiles(files2...)
|
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if err != nil {
|
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t.Fatal(err)
|
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}
|
|
|
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layer1, err := ls.Register(bytes.NewReader(tar1), "")
|
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if err != nil {
|
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t.Fatal(err)
|
|
}
|
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|
|
// hack layer to add file
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p, err := ls.(*layerStore).driver.Get(layer1.(*referencedCacheLayer).cacheID, "")
|
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if err != nil {
|
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t.Fatal(err)
|
|
}
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|
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if err := addedFile.ApplyFile(p); err != nil {
|
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t.Fatal(err)
|
|
}
|
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|
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if err := ls.(*layerStore).driver.Put(layer1.(*referencedCacheLayer).cacheID); err != nil {
|
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t.Fatal(err)
|
|
}
|
|
|
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layer2, err := ls.Register(bytes.NewReader(tar2), layer1.ChainID())
|
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if err != nil {
|
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t.Fatal(err)
|
|
}
|
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|
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id1 := layer1.ChainID()
|
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t.Logf("Layer 1: %s", layer1.ChainID())
|
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t.Logf("Layer 2: %s", layer2.ChainID())
|
|
|
|
if _, err := ls.Release(layer1); err != nil {
|
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t.Fatal(err)
|
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}
|
|
|
|
assertLayerDiff(t, tar2, layer2)
|
|
|
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layer1b, err := ls.Get(id1)
|
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if err != nil {
|
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t.Logf("Content of layer map: %#v", ls.(*layerStore).layerMap)
|
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t.Fatal(err)
|
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}
|
|
|
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if _, err := ls.Release(layer2); err != nil {
|
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t.Fatal(err)
|
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}
|
|
|
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assertLayerDiff(t, tar1, layer1b)
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|
|
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if _, err := ls.Release(layer1b); err != nil {
|
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t.Fatal(err)
|
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}
|
|
}
|
|
|
|
func assertLayerDiff(t *testing.T, expected []byte, layer Layer) {
|
|
expectedDigest := digest.FromBytes(expected)
|
|
|
|
if digest.Digest(layer.DiffID()) != expectedDigest {
|
|
t.Fatalf("Mismatched diff id for %s, got %s, expected %s", layer.ChainID(), layer.DiffID(), expected)
|
|
}
|
|
|
|
ts, err := layer.TarStream()
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
defer ts.Close()
|
|
|
|
actual, err := ioutil.ReadAll(ts)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
if len(actual) != len(expected) {
|
|
logByteDiff(t, actual, expected)
|
|
t.Fatalf("Mismatched tar stream size for %s, got %d, expected %d", layer.ChainID(), len(actual), len(expected))
|
|
}
|
|
|
|
actualDigest := digest.FromBytes(actual)
|
|
|
|
if actualDigest != expectedDigest {
|
|
logByteDiff(t, actual, expected)
|
|
t.Fatalf("Wrong digest of tar stream, got %s, expected %s", actualDigest, expectedDigest)
|
|
}
|
|
}
|
|
|
|
const maxByteLog = 4 * 1024
|
|
|
|
func logByteDiff(t *testing.T, actual, expected []byte) {
|
|
d1, d2 := byteDiff(actual, expected)
|
|
if len(d1) == 0 && len(d2) == 0 {
|
|
return
|
|
}
|
|
|
|
prefix := len(actual) - len(d1)
|
|
if len(d1) > maxByteLog || len(d2) > maxByteLog {
|
|
t.Logf("Byte diff after %d matching bytes", prefix)
|
|
} else {
|
|
t.Logf("Byte diff after %d matching bytes\nActual bytes after prefix:\n%x\nExpected bytes after prefix:\n%x", prefix, d1, d2)
|
|
}
|
|
}
|
|
|
|
// byteDiff returns the differing bytes after the matching prefix
|
|
func byteDiff(b1, b2 []byte) ([]byte, []byte) {
|
|
i := 0
|
|
for i < len(b1) && i < len(b2) {
|
|
if b1[i] != b2[i] {
|
|
break
|
|
}
|
|
i++
|
|
}
|
|
|
|
return b1[i:], b2[i:]
|
|
}
|
|
|
|
func tarFromFiles(files ...FileApplier) ([]byte, error) {
|
|
td, err := ioutil.TempDir("", "tar-")
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
defer os.RemoveAll(td)
|
|
|
|
for _, f := range files {
|
|
if err := f.ApplyFile(td); err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
r, err := archive.Tar(td, archive.Uncompressed)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
buf := bytes.NewBuffer(nil)
|
|
if _, err := io.Copy(buf, r); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return buf.Bytes(), nil
|
|
}
|
|
|
|
// assertReferences asserts that all the references are to the same
|
|
// image and represent the full set of references to that image.
|
|
func assertReferences(t *testing.T, references ...Layer) {
|
|
if len(references) == 0 {
|
|
return
|
|
}
|
|
base := references[0].(*referencedCacheLayer).roLayer
|
|
seenReferences := map[Layer]struct{}{
|
|
references[0]: {},
|
|
}
|
|
for i := 1; i < len(references); i++ {
|
|
other := references[i].(*referencedCacheLayer).roLayer
|
|
if base != other {
|
|
t.Fatalf("Unexpected referenced cache layer %s, expecting %s", other.ChainID(), base.ChainID())
|
|
}
|
|
if _, ok := base.references[references[i]]; !ok {
|
|
t.Fatalf("Reference not part of reference list: %v", references[i])
|
|
}
|
|
if _, ok := seenReferences[references[i]]; ok {
|
|
t.Fatalf("Duplicated reference %v", references[i])
|
|
}
|
|
}
|
|
if rc := len(base.references); rc != len(references) {
|
|
t.Fatalf("Unexpected number of references %d, expecting %d", rc, len(references))
|
|
}
|
|
}
|
|
|
|
func TestRegisterExistingLayer(t *testing.T) {
|
|
ls, _, cleanup := newTestStore(t)
|
|
defer cleanup()
|
|
|
|
baseFiles := []FileApplier{
|
|
newTestFile("/etc/profile", []byte("# Base configuration"), 0644),
|
|
}
|
|
|
|
layerFiles := []FileApplier{
|
|
newTestFile("/root/.bashrc", []byte("# Root configuration"), 0644),
|
|
}
|
|
|
|
li := initWithFiles(baseFiles...)
|
|
layer1, err := createLayer(ls, "", li)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
tar1, err := tarFromFiles(layerFiles...)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
layer2a, err := ls.Register(bytes.NewReader(tar1), layer1.ChainID())
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
layer2b, err := ls.Register(bytes.NewReader(tar1), layer1.ChainID())
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
assertReferences(t, layer2a, layer2b)
|
|
}
|
|
|
|
func TestTarStreamVerification(t *testing.T) {
|
|
// TODO Windows: Figure out why this is failing
|
|
if runtime.GOOS == "windows" {
|
|
t.Skip("Failing on Windows")
|
|
}
|
|
ls, tmpdir, cleanup := newTestStore(t)
|
|
defer cleanup()
|
|
|
|
files1 := []FileApplier{
|
|
newTestFile("/foo", []byte("abc"), 0644),
|
|
newTestFile("/bar", []byte("def"), 0644),
|
|
}
|
|
files2 := []FileApplier{
|
|
newTestFile("/foo", []byte("abc"), 0644),
|
|
newTestFile("/bar", []byte("def"), 0600), // different perm
|
|
}
|
|
|
|
tar1, err := tarFromFiles(files1...)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
tar2, err := tarFromFiles(files2...)
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
layer1, err := ls.Register(bytes.NewReader(tar1), "")
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
layer2, err := ls.Register(bytes.NewReader(tar2), "")
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
id1 := digest.Digest(layer1.ChainID())
|
|
id2 := digest.Digest(layer2.ChainID())
|
|
|
|
// Replace tar data files
|
|
src, err := os.Open(filepath.Join(tmpdir, id1.Algorithm().String(), id1.Hex(), "tar-split.json.gz"))
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
dst, err := os.Create(filepath.Join(tmpdir, id2.Algorithm().String(), id2.Hex(), "tar-split.json.gz"))
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
if _, err := io.Copy(dst, src); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
|
|
src.Close()
|
|
dst.Close()
|
|
|
|
ts, err := layer2.TarStream()
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
_, err = io.Copy(ioutil.Discard, ts)
|
|
if err == nil {
|
|
t.Fatal("expected data verification to fail")
|
|
}
|
|
if !strings.Contains(err.Error(), "could not verify layer data") {
|
|
t.Fatalf("wrong error returned from tarstream: %q", err)
|
|
}
|
|
}
|