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moby--moby/layer/migration_test.go
Derek McGowan 500e77bad0 Add layer store
Layer store manages read-only and read-write layers on a union file system.
Read only layers are always referenced by content addresses.
Read-write layer identifiers are handled by the caller but upon registering
its difference, the committed read-only layer will be referenced by content
hash.

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)
Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
2015-11-24 09:40:23 -08:00

385 lines
9.1 KiB
Go

package layer
import (
"bytes"
"compress/gzip"
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"testing"
"github.com/docker/docker/daemon/graphdriver"
"github.com/docker/docker/pkg/archive"
"github.com/docker/docker/pkg/stringid"
"github.com/vbatts/tar-split/tar/asm"
"github.com/vbatts/tar-split/tar/storage"
)
func writeTarSplitFile(name string, tarContent []byte) error {
f, err := os.OpenFile(name, os.O_TRUNC|os.O_CREATE|os.O_WRONLY, 0644)
if err != nil {
return err
}
defer f.Close()
fz := gzip.NewWriter(f)
metaPacker := storage.NewJSONPacker(fz)
defer fz.Close()
rdr, err := asm.NewInputTarStream(bytes.NewReader(tarContent), metaPacker, nil)
if err != nil {
return err
}
if _, err := io.Copy(ioutil.Discard, rdr); err != nil {
return err
}
return nil
}
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 := NewStore(fms, graph)
if err != nil {
t.Fatal(err)
}
layer1a, err := ls.(*layerStore).RegisterByGraphID(graphID1, "", tf1)
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)
}
layer2b, err := ls.(*layerStore).RegisterByGraphID(graphID2, layer1a.ChainID(), tf2)
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 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 TestLayerMigrationNoTarsplit(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),
}
graph, err := newVFSGraphDriver(filepath.Join(td, "graphdriver-"))
if err != nil {
t.Fatal(err)
}
graphID1 := stringid.GenerateRandomID()
graphID2 := stringid.GenerateRandomID()
tar1, err := tarFromFilesInGraph(graph, graphID1, "", layer1Files...)
if err != nil {
t.Fatal(err)
}
tar2, err := tarFromFilesInGraph(graph, graphID2, graphID1, layer2Files...)
if err != nil {
t.Fatal(err)
}
fms, err := NewFSMetadataStore(filepath.Join(td, "layers"))
if err != nil {
t.Fatal(err)
}
ls, err := NewStore(fms, graph)
if err != nil {
t.Fatal(err)
}
layer1a, err := ls.(*layerStore).RegisterByGraphID(graphID1, "", "")
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)
}
layer2b, err := ls.(*layerStore).RegisterByGraphID(graphID2, layer1a.ChainID(), "")
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)
}
rwLayer1, err := ls.(*layerStore).MountByGraphID("migration-mount", containerID, layer1.ChainID())
if err != nil {
t.Fatal(err)
}
changes, err := ls.Changes("migration-mount")
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,
})
if expectedCount := 1; rwLayer1.(*mountedLayer).activityCount != expectedCount {
t.Fatalf("Wrong activity count %d, expected %d", rwLayer1.(*mountedLayer).activityCount, expectedCount)
}
rwLayer2, err := ls.Mount("migration-mount", layer1.ChainID(), "", nil)
if err != nil {
t.Fatal(err)
}
if rwLayer1 != rwLayer2 {
t.Fatalf("Wrong rwlayer %v, expected %v", rwLayer2, rwLayer1)
}
if expectedCount := 2; rwLayer2.(*mountedLayer).activityCount != expectedCount {
t.Fatalf("Wrong activity count %d, expected %d", rwLayer2.(*mountedLayer).activityCount, expectedCount)
}
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 := ls.Unmount("migration-mount"); err != nil {
t.Fatal(err)
}
if _, err := ls.DeleteMount("migration-mount"); err == nil {
t.Fatal("Expected error deleting active mount")
}
if err := ls.Unmount("migration-mount"); err != nil {
t.Fatal(err)
}
metadata, err := ls.DeleteMount("migration-mount")
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))
}