зеркало из https://github.com/microsoft/docker.git
505 строки
13 KiB
Go
505 строки
13 KiB
Go
package v1
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"io/ioutil"
|
|
"os"
|
|
"path/filepath"
|
|
"runtime"
|
|
"strconv"
|
|
"sync"
|
|
"time"
|
|
|
|
"encoding/json"
|
|
|
|
"github.com/Sirupsen/logrus"
|
|
"github.com/docker/distribution/digest"
|
|
"github.com/docker/docker/distribution/metadata"
|
|
"github.com/docker/docker/image"
|
|
imagev1 "github.com/docker/docker/image/v1"
|
|
"github.com/docker/docker/layer"
|
|
"github.com/docker/docker/pkg/ioutils"
|
|
"github.com/docker/docker/reference"
|
|
)
|
|
|
|
type graphIDRegistrar interface {
|
|
RegisterByGraphID(string, layer.ChainID, layer.DiffID, string, int64) (layer.Layer, error)
|
|
Release(layer.Layer) ([]layer.Metadata, error)
|
|
}
|
|
|
|
type graphIDMounter interface {
|
|
CreateRWLayerByGraphID(string, string, layer.ChainID) error
|
|
}
|
|
|
|
type checksumCalculator interface {
|
|
ChecksumForGraphID(id, parent, oldTarDataPath, newTarDataPath string) (diffID layer.DiffID, size int64, err error)
|
|
}
|
|
|
|
const (
|
|
graphDirName = "graph"
|
|
tarDataFileName = "tar-data.json.gz"
|
|
migrationFileName = ".migration-v1-images.json"
|
|
migrationTagsFileName = ".migration-v1-tags"
|
|
migrationDiffIDFileName = ".migration-diffid"
|
|
migrationSizeFileName = ".migration-size"
|
|
migrationTarDataFileName = ".migration-tardata"
|
|
containersDirName = "containers"
|
|
configFileNameLegacy = "config.json"
|
|
configFileName = "config.v2.json"
|
|
repositoriesFilePrefixLegacy = "repositories-"
|
|
)
|
|
|
|
var (
|
|
errUnsupported = errors.New("migration is not supported")
|
|
)
|
|
|
|
// Migrate takes an old graph directory and transforms the metadata into the
|
|
// new format.
|
|
func Migrate(root, driverName string, ls layer.Store, is image.Store, rs reference.Store, ms metadata.Store) error {
|
|
graphDir := filepath.Join(root, graphDirName)
|
|
if _, err := os.Lstat(graphDir); os.IsNotExist(err) {
|
|
return nil
|
|
}
|
|
|
|
mappings, err := restoreMappings(root)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if cc, ok := ls.(checksumCalculator); ok {
|
|
CalculateLayerChecksums(root, cc, mappings)
|
|
}
|
|
|
|
if registrar, ok := ls.(graphIDRegistrar); !ok {
|
|
return errUnsupported
|
|
} else if err := migrateImages(root, registrar, is, ms, mappings); err != nil {
|
|
return err
|
|
}
|
|
|
|
err = saveMappings(root, mappings)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if mounter, ok := ls.(graphIDMounter); !ok {
|
|
return errUnsupported
|
|
} else if err := migrateContainers(root, mounter, is, mappings); err != nil {
|
|
return err
|
|
}
|
|
|
|
if err := migrateRefs(root, driverName, rs, mappings); err != nil {
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// CalculateLayerChecksums walks an old graph directory and calculates checksums
|
|
// for each layer. These checksums are later used for migration.
|
|
func CalculateLayerChecksums(root string, ls checksumCalculator, mappings map[string]image.ID) {
|
|
graphDir := filepath.Join(root, graphDirName)
|
|
// spawn some extra workers also for maximum performance because the process is bounded by both cpu and io
|
|
workers := runtime.NumCPU() * 3
|
|
workQueue := make(chan string, workers)
|
|
|
|
wg := sync.WaitGroup{}
|
|
|
|
for i := 0; i < workers; i++ {
|
|
wg.Add(1)
|
|
go func() {
|
|
for id := range workQueue {
|
|
start := time.Now()
|
|
if err := calculateLayerChecksum(graphDir, id, ls); err != nil {
|
|
logrus.Errorf("could not calculate checksum for %q, %q", id, err)
|
|
}
|
|
elapsed := time.Since(start)
|
|
logrus.Debugf("layer %s took %.2f seconds", id, elapsed.Seconds())
|
|
}
|
|
wg.Done()
|
|
}()
|
|
}
|
|
|
|
dir, err := ioutil.ReadDir(graphDir)
|
|
if err != nil {
|
|
logrus.Errorf("could not read directory %q", graphDir)
|
|
return
|
|
}
|
|
for _, v := range dir {
|
|
v1ID := v.Name()
|
|
if err := imagev1.ValidateID(v1ID); err != nil {
|
|
continue
|
|
}
|
|
if _, ok := mappings[v1ID]; ok { // support old migrations without helper files
|
|
continue
|
|
}
|
|
workQueue <- v1ID
|
|
}
|
|
close(workQueue)
|
|
wg.Wait()
|
|
}
|
|
|
|
func calculateLayerChecksum(graphDir, id string, ls checksumCalculator) error {
|
|
diffIDFile := filepath.Join(graphDir, id, migrationDiffIDFileName)
|
|
if _, err := os.Lstat(diffIDFile); err == nil {
|
|
return nil
|
|
} else if !os.IsNotExist(err) {
|
|
return err
|
|
}
|
|
|
|
parent, err := getParent(filepath.Join(graphDir, id))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
diffID, size, err := ls.ChecksumForGraphID(id, parent, filepath.Join(graphDir, id, tarDataFileName), filepath.Join(graphDir, id, migrationTarDataFileName))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if err := ioutil.WriteFile(filepath.Join(graphDir, id, migrationSizeFileName), []byte(strconv.Itoa(int(size))), 0600); err != nil {
|
|
return err
|
|
}
|
|
|
|
if err := ioutils.AtomicWriteFile(filepath.Join(graphDir, id, migrationDiffIDFileName), []byte(diffID), 0600); err != nil {
|
|
return err
|
|
}
|
|
|
|
logrus.Infof("calculated checksum for layer %s: %s", id, diffID)
|
|
return nil
|
|
}
|
|
|
|
func restoreMappings(root string) (map[string]image.ID, error) {
|
|
mappings := make(map[string]image.ID)
|
|
|
|
mfile := filepath.Join(root, migrationFileName)
|
|
f, err := os.Open(mfile)
|
|
if err != nil && !os.IsNotExist(err) {
|
|
return nil, err
|
|
} else if err == nil {
|
|
err := json.NewDecoder(f).Decode(&mappings)
|
|
if err != nil {
|
|
f.Close()
|
|
return nil, err
|
|
}
|
|
f.Close()
|
|
}
|
|
|
|
return mappings, nil
|
|
}
|
|
|
|
func saveMappings(root string, mappings map[string]image.ID) error {
|
|
mfile := filepath.Join(root, migrationFileName)
|
|
f, err := os.OpenFile(mfile, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer f.Close()
|
|
if err := json.NewEncoder(f).Encode(mappings); err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func migrateImages(root string, ls graphIDRegistrar, is image.Store, ms metadata.Store, mappings map[string]image.ID) error {
|
|
graphDir := filepath.Join(root, graphDirName)
|
|
|
|
dir, err := ioutil.ReadDir(graphDir)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
for _, v := range dir {
|
|
v1ID := v.Name()
|
|
if err := imagev1.ValidateID(v1ID); err != nil {
|
|
continue
|
|
}
|
|
if _, exists := mappings[v1ID]; exists {
|
|
continue
|
|
}
|
|
if err := migrateImage(v1ID, root, ls, is, ms, mappings); err != nil {
|
|
continue
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func migrateContainers(root string, ls graphIDMounter, is image.Store, imageMappings map[string]image.ID) error {
|
|
containersDir := filepath.Join(root, containersDirName)
|
|
dir, err := ioutil.ReadDir(containersDir)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
for _, v := range dir {
|
|
id := v.Name()
|
|
|
|
if _, err := os.Stat(filepath.Join(containersDir, id, configFileName)); err == nil {
|
|
continue
|
|
}
|
|
|
|
containerJSON, err := ioutil.ReadFile(filepath.Join(containersDir, id, configFileNameLegacy))
|
|
if err != nil {
|
|
logrus.Errorf("migrate container error: %v", err)
|
|
continue
|
|
}
|
|
|
|
var c map[string]*json.RawMessage
|
|
if err := json.Unmarshal(containerJSON, &c); err != nil {
|
|
logrus.Errorf("migrate container error: %v", err)
|
|
continue
|
|
}
|
|
|
|
imageStrJSON, ok := c["Image"]
|
|
if !ok {
|
|
return fmt.Errorf("invalid container configuration for %v", id)
|
|
}
|
|
|
|
var image string
|
|
if err := json.Unmarshal([]byte(*imageStrJSON), &image); err != nil {
|
|
logrus.Errorf("migrate container error: %v", err)
|
|
continue
|
|
}
|
|
|
|
imageID, ok := imageMappings[image]
|
|
if !ok {
|
|
logrus.Errorf("image not migrated %v", imageID) // non-fatal error
|
|
continue
|
|
}
|
|
|
|
c["Image"] = rawJSON(imageID)
|
|
|
|
containerJSON, err = json.Marshal(c)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if err := ioutil.WriteFile(filepath.Join(containersDir, id, configFileName), containerJSON, 0600); err != nil {
|
|
return err
|
|
}
|
|
|
|
img, err := is.Get(imageID)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if err := ls.CreateRWLayerByGraphID(id, id, img.RootFS.ChainID()); err != nil {
|
|
logrus.Errorf("migrate container error: %v", err)
|
|
continue
|
|
}
|
|
|
|
logrus.Infof("migrated container %s to point to %s", id, imageID)
|
|
|
|
}
|
|
return nil
|
|
}
|
|
|
|
type refAdder interface {
|
|
AddTag(ref reference.Named, id image.ID, force bool) error
|
|
AddDigest(ref reference.Canonical, id image.ID, force bool) error
|
|
}
|
|
|
|
func migrateRefs(root, driverName string, rs refAdder, mappings map[string]image.ID) error {
|
|
migrationFile := filepath.Join(root, migrationTagsFileName)
|
|
if _, err := os.Lstat(migrationFile); !os.IsNotExist(err) {
|
|
return err
|
|
}
|
|
|
|
type repositories struct {
|
|
Repositories map[string]map[string]string
|
|
}
|
|
|
|
var repos repositories
|
|
|
|
f, err := os.Open(filepath.Join(root, repositoriesFilePrefixLegacy+driverName))
|
|
if err != nil {
|
|
if os.IsNotExist(err) {
|
|
return nil
|
|
}
|
|
return err
|
|
}
|
|
defer f.Close()
|
|
if err := json.NewDecoder(f).Decode(&repos); err != nil {
|
|
return err
|
|
}
|
|
|
|
for name, repo := range repos.Repositories {
|
|
for tag, id := range repo {
|
|
if strongID, exists := mappings[id]; exists {
|
|
ref, err := reference.WithName(name)
|
|
if err != nil {
|
|
logrus.Errorf("migrate tags: invalid name %q, %q", name, err)
|
|
continue
|
|
}
|
|
if dgst, err := digest.ParseDigest(tag); err == nil {
|
|
canonical, err := reference.WithDigest(ref, dgst)
|
|
if err != nil {
|
|
logrus.Errorf("migrate tags: invalid digest %q, %q", dgst, err)
|
|
continue
|
|
}
|
|
if err := rs.AddDigest(canonical, strongID, false); err != nil {
|
|
logrus.Errorf("can't migrate digest %q for %q, err: %q", ref.String(), strongID, err)
|
|
}
|
|
} else {
|
|
tagRef, err := reference.WithTag(ref, tag)
|
|
if err != nil {
|
|
logrus.Errorf("migrate tags: invalid tag %q, %q", tag, err)
|
|
continue
|
|
}
|
|
if err := rs.AddTag(tagRef, strongID, false); err != nil {
|
|
logrus.Errorf("can't migrate tag %q for %q, err: %q", ref.String(), strongID, err)
|
|
}
|
|
}
|
|
logrus.Infof("migrated tag %s:%s to point to %s", name, tag, strongID)
|
|
}
|
|
}
|
|
}
|
|
|
|
mf, err := os.Create(migrationFile)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
mf.Close()
|
|
|
|
return nil
|
|
}
|
|
|
|
func getParent(confDir string) (string, error) {
|
|
jsonFile := filepath.Join(confDir, "json")
|
|
imageJSON, err := ioutil.ReadFile(jsonFile)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
var parent struct {
|
|
Parent string
|
|
ParentID digest.Digest `json:"parent_id"`
|
|
}
|
|
if err := json.Unmarshal(imageJSON, &parent); err != nil {
|
|
return "", err
|
|
}
|
|
if parent.Parent == "" && parent.ParentID != "" { // v1.9
|
|
parent.Parent = parent.ParentID.Hex()
|
|
}
|
|
// compatibilityID for parent
|
|
parentCompatibilityID, err := ioutil.ReadFile(filepath.Join(confDir, "parent"))
|
|
if err == nil && len(parentCompatibilityID) > 0 {
|
|
parent.Parent = string(parentCompatibilityID)
|
|
}
|
|
return parent.Parent, nil
|
|
}
|
|
|
|
func migrateImage(id, root string, ls graphIDRegistrar, is image.Store, ms metadata.Store, mappings map[string]image.ID) (err error) {
|
|
defer func() {
|
|
if err != nil {
|
|
logrus.Errorf("migration failed for %v, err: %v", id, err)
|
|
}
|
|
}()
|
|
|
|
parent, err := getParent(filepath.Join(root, graphDirName, id))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
var parentID image.ID
|
|
if parent != "" {
|
|
var exists bool
|
|
if parentID, exists = mappings[parent]; !exists {
|
|
if err := migrateImage(parent, root, ls, is, ms, mappings); err != nil {
|
|
// todo: fail or allow broken chains?
|
|
return err
|
|
}
|
|
parentID = mappings[parent]
|
|
}
|
|
}
|
|
|
|
rootFS := image.NewRootFS()
|
|
var history []image.History
|
|
|
|
if parentID != "" {
|
|
parentImg, err := is.Get(parentID)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
rootFS = parentImg.RootFS
|
|
history = parentImg.History
|
|
}
|
|
|
|
diffIDData, err := ioutil.ReadFile(filepath.Join(root, graphDirName, id, migrationDiffIDFileName))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
diffID, err := digest.ParseDigest(string(diffIDData))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
sizeStr, err := ioutil.ReadFile(filepath.Join(root, graphDirName, id, migrationSizeFileName))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
size, err := strconv.ParseInt(string(sizeStr), 10, 64)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
layer, err := ls.RegisterByGraphID(id, rootFS.ChainID(), layer.DiffID(diffID), filepath.Join(root, graphDirName, id, migrationTarDataFileName), size)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
logrus.Infof("migrated layer %s to %s", id, layer.DiffID())
|
|
|
|
jsonFile := filepath.Join(root, graphDirName, id, "json")
|
|
imageJSON, err := ioutil.ReadFile(jsonFile)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
h, err := imagev1.HistoryFromConfig(imageJSON, false)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
history = append(history, h)
|
|
|
|
rootFS.Append(layer.DiffID())
|
|
|
|
config, err := imagev1.MakeConfigFromV1Config(imageJSON, rootFS, history)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
strongID, err := is.Create(config)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
logrus.Infof("migrated image %s to %s", id, strongID)
|
|
|
|
if parentID != "" {
|
|
if err := is.SetParent(strongID, parentID); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
checksum, err := ioutil.ReadFile(filepath.Join(root, graphDirName, id, "checksum"))
|
|
if err == nil { // best effort
|
|
dgst, err := digest.ParseDigest(string(checksum))
|
|
if err == nil {
|
|
V2MetadataService := metadata.NewV2MetadataService(ms)
|
|
V2MetadataService.Add(layer.DiffID(), metadata.V2Metadata{Digest: dgst})
|
|
}
|
|
}
|
|
_, err = ls.Release(layer)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
mappings[id] = strongID
|
|
return
|
|
}
|
|
|
|
func rawJSON(value interface{}) *json.RawMessage {
|
|
jsonval, err := json.Marshal(value)
|
|
if err != nil {
|
|
return nil
|
|
}
|
|
return (*json.RawMessage)(&jsonval)
|
|
}
|