func (ls *layerStore) applyTar(tx MetadataTransaction, ts io.Reader, parent string, layer *roLayer) error {
digester := digest.Canonical.New()
tr := io.TeeReader(ts, digester.Hash())
tsw, err := tx.TarSplitWriter(true)
if err != nil {
return err
}
metaPacker := storage.NewJSONPacker(tsw)
defer tsw.Close()
// we're passing nil here for the file putter, because the ApplyDiff will
// handle the extraction of the archive
rdr, err := asm.NewInputTarStream(tr, metaPacker, nil)
if err != nil {
return err
}
applySize, err := ls.driver.ApplyDiff(layer.cacheID, parent, archive.Reader(rdr))
if err != nil {
return err
}
// Discard trailing data but ensure metadata is picked up to reconstruct stream
io.Copy(ioutil.Discard, rdr) // ignore error as reader may be closed
layer.size = applySize
layer.diffID = DiffID(digester.Digest())
logrus.Debugf("Applied tar %s to %s, size: %d", layer.diffID, layer.cacheID, applySize)
return nil
}
func (graph *Graph) disassembleAndApplyTarLayer(img *image.Image, layerData archive.Reader, root string) error {
// this is saving the tar-split metadata
mf, err := os.OpenFile(filepath.Join(root, tarDataFileName), os.O_CREATE|os.O_WRONLY|os.O_TRUNC, os.FileMode(0600))
if err != nil {
return err
}
mfz := gzip.NewWriter(mf)
metaPacker := storage.NewJSONPacker(mfz)
defer mf.Close()
defer mfz.Close()
inflatedLayerData, err := archive.DecompressStream(layerData)
if err != nil {
return err
}
// we're passing nil here for the file putter, because the ApplyDiff will
// handle the extraction of the archive
rdr, err := asm.NewInputTarStream(inflatedLayerData, metaPacker, nil)
if err != nil {
return err
}
if img.Size, err = graph.driver.ApplyDiff(img.ID, img.Parent, archive.Reader(rdr)); err != nil {
return err
}
return nil
}
func tarFromFilesInGraph(graph graphdriver.Driver, graphID, parentID string, files ...FileApplier) ([]byte, error) {
t, err := tarFromFiles(files...)
if err != nil {
return nil, err
}
if err := graph.Create(graphID, parentID, ""); err != nil {
return nil, err
}
if _, err := graph.ApplyDiff(graphID, parentID, archive.Reader(bytes.NewReader(t))); err != nil {
return nil, err
}
ar, err := graph.Diff(graphID, parentID)
if err != nil {
return nil, err
}
defer ar.Close()
return ioutil.ReadAll(ar)
}
func (graph *Graph) disassembleAndApplyTarLayer(id, parent string, layerData io.Reader, root string) (size int64, err error) {
var ar io.Reader
if graph.tarSplitDisabled {
ar = layerData
} else {
// this is saving the tar-split metadata
mf, err := os.OpenFile(filepath.Join(root, tarDataFileName), os.O_CREATE|os.O_WRONLY|os.O_TRUNC, os.FileMode(0600))
if err != nil {
return 0, err
}
mfz := gzip.NewWriter(mf)
metaPacker := storage.NewJSONPacker(mfz)
defer mf.Close()
defer mfz.Close()
inflatedLayerData, err := archive.DecompressStream(layerData)
if err != nil {
return 0, err
}
// we're passing nil here for the file putter, because the ApplyDiff will
// handle the extraction of the archive
rdr, err := asm.NewInputTarStream(inflatedLayerData, metaPacker, nil)
if err != nil {
return 0, err
}
ar = archive.Reader(rdr)
}
if size, err = graph.driver.ApplyDiff(id, parent, ar); err != nil {
return 0, err
}
return
}
func TestLayerMigration(t *testing.T) {
td, err := ioutil.TempDir("", "migration-test-")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(td)
layer1Files := []FileApplier{
newTestFile("/root/.bashrc", []byte("# Boring configuration"), 0644),
newTestFile("/etc/profile", []byte("# Base configuration"), 0644),
}
layer2Files := []FileApplier{
newTestFile("/root/.bashrc", []byte("# Updated configuration"), 0644),
}
tar1, err := tarFromFiles(layer1Files...)
if err != nil {
t.Fatal(err)
}
tar2, err := tarFromFiles(layer2Files...)
if err != nil {
t.Fatal(err)
}
graph, err := newVFSGraphDriver(filepath.Join(td, "graphdriver-"))
if err != nil {
t.Fatal(err)
}
graphID1 := stringid.GenerateRandomID()
if err := graph.Create(graphID1, "", ""); err != nil {
t.Fatal(err)
}
if _, err := graph.ApplyDiff(graphID1, "", archive.Reader(bytes.NewReader(tar1))); err != nil {
t.Fatal(err)
}
tf1 := filepath.Join(td, "tar1.json.gz")
if err := writeTarSplitFile(tf1, tar1); err != nil {
t.Fatal(err)
}
fms, err := NewFSMetadataStore(filepath.Join(td, "layers"))
if err != nil {
t.Fatal(err)
}
ls, err := NewStoreFromGraphDriver(fms, graph)
if err != nil {
t.Fatal(err)
}
newTarDataPath := filepath.Join(td, ".migration-tardata")
diffID, size, err := ls.(*layerStore).ChecksumForGraphID(graphID1, "", tf1, newTarDataPath)
if err != nil {
t.Fatal(err)
}
layer1a, err := ls.(*layerStore).RegisterByGraphID(graphID1, "", diffID, newTarDataPath, size)
if err != nil {
t.Fatal(err)
}
layer1b, err := ls.Register(bytes.NewReader(tar1), "")
if err != nil {
t.Fatal(err)
}
assertReferences(t, layer1a, layer1b)
// Attempt register, should be same
layer2a, err := ls.Register(bytes.NewReader(tar2), layer1a.ChainID())
if err != nil {
t.Fatal(err)
}
graphID2 := stringid.GenerateRandomID()
if err := graph.Create(graphID2, graphID1, ""); err != nil {
t.Fatal(err)
}
if _, err := graph.ApplyDiff(graphID2, graphID1, archive.Reader(bytes.NewReader(tar2))); err != nil {
t.Fatal(err)
}
tf2 := filepath.Join(td, "tar2.json.gz")
if err := writeTarSplitFile(tf2, tar2); err != nil {
t.Fatal(err)
}
diffID, size, err = ls.(*layerStore).ChecksumForGraphID(graphID2, graphID1, tf2, newTarDataPath)
if err != nil {
t.Fatal(err)
}
layer2b, err := ls.(*layerStore).RegisterByGraphID(graphID2, layer1a.ChainID(), diffID, tf2, size)
if err != nil {
t.Fatal(err)
}
assertReferences(t, layer2a, layer2b)
if metadata, err := ls.Release(layer2a); err != nil {
t.Fatal(err)
} else if len(metadata) > 0 {
t.Fatalf("Unexpected layer removal after first release: %#v", metadata)
}
metadata, err := ls.Release(layer2b)
if err != nil {
t.Fatal(err)
}
assertMetadata(t, metadata, createMetadata(layer2a))
}
func TestMountMigration(t *testing.T) {
ls, _, cleanup := newTestStore(t)
defer cleanup()
baseFiles := []FileApplier{
newTestFile("/root/.bashrc", []byte("# Boring configuration"), 0644),
newTestFile("/etc/profile", []byte("# Base configuration"), 0644),
}
initFiles := []FileApplier{
newTestFile("/etc/hosts", []byte{}, 0644),
newTestFile("/etc/resolv.conf", []byte{}, 0644),
}
mountFiles := []FileApplier{
newTestFile("/etc/hosts", []byte("localhost 127.0.0.1"), 0644),
newTestFile("/root/.bashrc", []byte("# Updated configuration"), 0644),
newTestFile("/root/testfile1.txt", []byte("nothing valuable"), 0644),
}
initTar, err := tarFromFiles(initFiles...)
if err != nil {
t.Fatal(err)
}
mountTar, err := tarFromFiles(mountFiles...)
if err != nil {
t.Fatal(err)
}
graph := ls.(*layerStore).driver
layer1, err := createLayer(ls, "", initWithFiles(baseFiles...))
if err != nil {
t.Fatal(err)
}
graphID1 := layer1.(*referencedCacheLayer).cacheID
containerID := stringid.GenerateRandomID()
containerInit := fmt.Sprintf("%s-init", containerID)
if err := graph.Create(containerInit, graphID1, ""); err != nil {
t.Fatal(err)
}
if _, err := graph.ApplyDiff(containerInit, graphID1, archive.Reader(bytes.NewReader(initTar))); err != nil {
t.Fatal(err)
}
if err := graph.Create(containerID, containerInit, ""); err != nil {
t.Fatal(err)
}
if _, err := graph.ApplyDiff(containerID, containerInit, archive.Reader(bytes.NewReader(mountTar))); err != nil {
t.Fatal(err)
}
if err := ls.(*layerStore).CreateRWLayerByGraphID("migration-mount", containerID, layer1.ChainID()); err != nil {
t.Fatal(err)
}
rwLayer1, err := ls.GetRWLayer("migration-mount")
if err != nil {
t.Fatal(err)
}
if _, err := rwLayer1.Mount(""); err != nil {
t.Fatal(err)
}
changes, err := rwLayer1.Changes()
if err != nil {
t.Fatal(err)
}
if expected := 5; len(changes) != expected {
t.Logf("Changes %#v", changes)
t.Fatalf("Wrong number of changes %d, expected %d", len(changes), expected)
}
sortChanges(changes)
assertChange(t, changes[0], archive.Change{
Path: "/etc",
Kind: archive.ChangeModify,
})
assertChange(t, changes[1], archive.Change{
Path: "/etc/hosts",
Kind: archive.ChangeModify,
})
assertChange(t, changes[2], archive.Change{
Path: "/root",
Kind: archive.ChangeModify,
})
assertChange(t, changes[3], archive.Change{
Path: "/root/.bashrc",
Kind: archive.ChangeModify,
})
assertChange(t, changes[4], archive.Change{
Path: "/root/testfile1.txt",
Kind: archive.ChangeAdd,
})
assertActivityCount(t, rwLayer1, 1)
if _, err := ls.CreateRWLayer("migration-mount", layer1.ChainID(), "", nil); err == nil {
t.Fatal("Expected error creating mount with same name")
} else if err != ErrMountNameConflict {
t.Fatal(err)
}
rwLayer2, err := ls.GetRWLayer("migration-mount")
if err != nil {
t.Fatal(err)
}
if getMountLayer(rwLayer1) != getMountLayer(rwLayer2) {
t.Fatal("Expected same layer from get with same name as from migrate")
}
if _, err := rwLayer2.Mount(""); err != nil {
t.Fatal(err)
}
assertActivityCount(t, rwLayer2, 1)
assertActivityCount(t, rwLayer1, 1)
if _, err := rwLayer2.Mount(""); err != nil {
t.Fatal(err)
}
assertActivityCount(t, rwLayer2, 2)
assertActivityCount(t, rwLayer1, 1)
if metadata, err := ls.Release(layer1); err != nil {
t.Fatal(err)
} else if len(metadata) > 0 {
t.Fatalf("Expected no layers to be deleted, deleted %#v", metadata)
}
if err := rwLayer1.Unmount(); err != nil {
t.Fatal(err)
}
assertActivityCount(t, rwLayer2, 2)
assertActivityCount(t, rwLayer1, 0)
if _, err := ls.ReleaseRWLayer(rwLayer1); err != nil {
t.Fatal(err)
}
if err := rwLayer2.Unmount(); err != nil {
t.Fatal(err)
}
if _, err := ls.ReleaseRWLayer(rwLayer2); err == nil {
t.Fatal("Expected error deleting active mount")
}
if err := rwLayer2.Unmount(); err != nil {
t.Fatal(err)
}
metadata, err := ls.ReleaseRWLayer(rwLayer2)
if err != nil {
t.Fatal(err)
}
if len(metadata) == 0 {
t.Fatal("Expected base layer to be deleted when deleting mount")
}
assertMetadata(t, metadata, createMetadata(layer1))
}