355 lines
8.7 KiB
Go
355 lines
8.7 KiB
Go
package layer
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import (
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"compress/gzip"
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"encoding/json"
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"errors"
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"fmt"
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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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"regexp"
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"strconv"
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"strings"
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"github.com/docker/distribution"
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"github.com/docker/docker/pkg/ioutils"
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"github.com/opencontainers/go-digest"
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"github.com/sirupsen/logrus"
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)
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var (
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stringIDRegexp = regexp.MustCompile(`^[a-f0-9]{64}(-init)?$`)
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supportedAlgorithms = []digest.Algorithm{
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digest.SHA256,
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// digest.SHA384, // Currently not used
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// digest.SHA512, // Currently not used
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}
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)
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type fileMetadataStore struct {
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root string
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}
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type fileMetadataTransaction struct {
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store *fileMetadataStore
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ws *ioutils.AtomicWriteSet
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}
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// NewFSMetadataStore returns an instance of a metadata store
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// which is backed by files on disk using the provided root
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// as the root of metadata files.
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func NewFSMetadataStore(root string) (MetadataStore, error) {
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if err := os.MkdirAll(root, 0700); err != nil {
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return nil, err
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}
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return &fileMetadataStore{
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root: root,
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}, nil
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}
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func (fms *fileMetadataStore) getLayerDirectory(layer ChainID) string {
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dgst := digest.Digest(layer)
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return filepath.Join(fms.root, string(dgst.Algorithm()), dgst.Hex())
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}
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func (fms *fileMetadataStore) getLayerFilename(layer ChainID, filename string) string {
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return filepath.Join(fms.getLayerDirectory(layer), filename)
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}
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func (fms *fileMetadataStore) getMountDirectory(mount string) string {
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return filepath.Join(fms.root, "mounts", mount)
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}
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func (fms *fileMetadataStore) getMountFilename(mount, filename string) string {
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return filepath.Join(fms.getMountDirectory(mount), filename)
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}
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func (fms *fileMetadataStore) StartTransaction() (MetadataTransaction, error) {
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tmpDir := filepath.Join(fms.root, "tmp")
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if err := os.MkdirAll(tmpDir, 0755); err != nil {
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return nil, err
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}
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ws, err := ioutils.NewAtomicWriteSet(tmpDir)
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if err != nil {
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return nil, err
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}
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return &fileMetadataTransaction{
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store: fms,
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ws: ws,
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}, nil
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}
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func (fm *fileMetadataTransaction) SetSize(size int64) error {
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content := fmt.Sprintf("%d", size)
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return fm.ws.WriteFile("size", []byte(content), 0644)
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}
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func (fm *fileMetadataTransaction) SetParent(parent ChainID) error {
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return fm.ws.WriteFile("parent", []byte(digest.Digest(parent).String()), 0644)
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}
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func (fm *fileMetadataTransaction) SetDiffID(diff DiffID) error {
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return fm.ws.WriteFile("diff", []byte(digest.Digest(diff).String()), 0644)
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}
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func (fm *fileMetadataTransaction) SetCacheID(cacheID string) error {
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return fm.ws.WriteFile("cache-id", []byte(cacheID), 0644)
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}
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func (fm *fileMetadataTransaction) SetDescriptor(ref distribution.Descriptor) error {
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jsonRef, err := json.Marshal(ref)
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if err != nil {
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return err
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}
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return fm.ws.WriteFile("descriptor.json", jsonRef, 0644)
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}
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func (fm *fileMetadataTransaction) TarSplitWriter(compressInput bool) (io.WriteCloser, error) {
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f, err := fm.ws.FileWriter("tar-split.json.gz", os.O_TRUNC|os.O_CREATE|os.O_WRONLY, 0644)
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if err != nil {
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return nil, err
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}
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var wc io.WriteCloser
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if compressInput {
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wc = gzip.NewWriter(f)
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} else {
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wc = f
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}
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return ioutils.NewWriteCloserWrapper(wc, func() error {
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wc.Close()
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return f.Close()
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}), nil
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}
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func (fm *fileMetadataTransaction) Commit(layer ChainID) error {
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finalDir := fm.store.getLayerDirectory(layer)
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if err := os.MkdirAll(filepath.Dir(finalDir), 0755); err != nil {
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return err
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}
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return fm.ws.Commit(finalDir)
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}
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func (fm *fileMetadataTransaction) Cancel() error {
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return fm.ws.Cancel()
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}
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func (fm *fileMetadataTransaction) String() string {
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return fm.ws.String()
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}
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func (fms *fileMetadataStore) GetSize(layer ChainID) (int64, error) {
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content, err := ioutil.ReadFile(fms.getLayerFilename(layer, "size"))
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if err != nil {
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return 0, err
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}
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size, err := strconv.ParseInt(string(content), 10, 64)
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if err != nil {
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return 0, err
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}
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return size, nil
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}
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func (fms *fileMetadataStore) GetParent(layer ChainID) (ChainID, error) {
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content, err := ioutil.ReadFile(fms.getLayerFilename(layer, "parent"))
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if err != nil {
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if os.IsNotExist(err) {
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return "", nil
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}
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return "", err
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}
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dgst, err := digest.Parse(strings.TrimSpace(string(content)))
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if err != nil {
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return "", err
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}
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return ChainID(dgst), nil
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}
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func (fms *fileMetadataStore) GetDiffID(layer ChainID) (DiffID, error) {
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content, err := ioutil.ReadFile(fms.getLayerFilename(layer, "diff"))
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if err != nil {
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return "", err
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}
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dgst, err := digest.Parse(strings.TrimSpace(string(content)))
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if err != nil {
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return "", err
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}
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return DiffID(dgst), nil
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}
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func (fms *fileMetadataStore) GetCacheID(layer ChainID) (string, error) {
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contentBytes, err := ioutil.ReadFile(fms.getLayerFilename(layer, "cache-id"))
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if err != nil {
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return "", err
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}
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content := strings.TrimSpace(string(contentBytes))
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if !stringIDRegexp.MatchString(content) {
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return "", errors.New("invalid cache id value")
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}
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return content, nil
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}
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func (fms *fileMetadataStore) GetDescriptor(layer ChainID) (distribution.Descriptor, error) {
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content, err := ioutil.ReadFile(fms.getLayerFilename(layer, "descriptor.json"))
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if err != nil {
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if os.IsNotExist(err) {
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// only return empty descriptor to represent what is stored
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return distribution.Descriptor{}, nil
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}
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return distribution.Descriptor{}, err
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}
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var ref distribution.Descriptor
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err = json.Unmarshal(content, &ref)
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if err != nil {
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return distribution.Descriptor{}, err
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}
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return ref, err
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}
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func (fms *fileMetadataStore) TarSplitReader(layer ChainID) (io.ReadCloser, error) {
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fz, err := os.Open(fms.getLayerFilename(layer, "tar-split.json.gz"))
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if err != nil {
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return nil, err
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}
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f, err := gzip.NewReader(fz)
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if err != nil {
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fz.Close()
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return nil, err
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}
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return ioutils.NewReadCloserWrapper(f, func() error {
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f.Close()
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return fz.Close()
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}), nil
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}
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func (fms *fileMetadataStore) SetMountID(mount string, mountID string) error {
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if err := os.MkdirAll(fms.getMountDirectory(mount), 0755); err != nil {
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return err
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}
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return ioutil.WriteFile(fms.getMountFilename(mount, "mount-id"), []byte(mountID), 0644)
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}
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func (fms *fileMetadataStore) SetInitID(mount string, init string) error {
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if err := os.MkdirAll(fms.getMountDirectory(mount), 0755); err != nil {
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return err
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}
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return ioutil.WriteFile(fms.getMountFilename(mount, "init-id"), []byte(init), 0644)
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}
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func (fms *fileMetadataStore) SetMountParent(mount string, parent ChainID) error {
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if err := os.MkdirAll(fms.getMountDirectory(mount), 0755); err != nil {
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return err
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}
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return ioutil.WriteFile(fms.getMountFilename(mount, "parent"), []byte(digest.Digest(parent).String()), 0644)
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}
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func (fms *fileMetadataStore) GetMountID(mount string) (string, error) {
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contentBytes, err := ioutil.ReadFile(fms.getMountFilename(mount, "mount-id"))
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if err != nil {
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return "", err
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}
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content := strings.TrimSpace(string(contentBytes))
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if !stringIDRegexp.MatchString(content) {
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return "", errors.New("invalid mount id value")
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}
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return content, nil
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}
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func (fms *fileMetadataStore) GetInitID(mount string) (string, error) {
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contentBytes, err := ioutil.ReadFile(fms.getMountFilename(mount, "init-id"))
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if err != nil {
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if os.IsNotExist(err) {
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return "", nil
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}
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return "", err
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}
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content := strings.TrimSpace(string(contentBytes))
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if !stringIDRegexp.MatchString(content) {
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return "", errors.New("invalid init id value")
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}
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return content, nil
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}
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func (fms *fileMetadataStore) GetMountParent(mount string) (ChainID, error) {
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content, err := ioutil.ReadFile(fms.getMountFilename(mount, "parent"))
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if err != nil {
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if os.IsNotExist(err) {
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return "", nil
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}
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return "", err
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}
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dgst, err := digest.Parse(strings.TrimSpace(string(content)))
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if err != nil {
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return "", err
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}
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return ChainID(dgst), nil
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}
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func (fms *fileMetadataStore) List() ([]ChainID, []string, error) {
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var ids []ChainID
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for _, algorithm := range supportedAlgorithms {
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fileInfos, err := ioutil.ReadDir(filepath.Join(fms.root, string(algorithm)))
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if err != nil {
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if os.IsNotExist(err) {
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continue
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}
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return nil, nil, err
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}
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for _, fi := range fileInfos {
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if fi.IsDir() && fi.Name() != "mounts" {
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dgst := digest.NewDigestFromHex(string(algorithm), fi.Name())
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if err := dgst.Validate(); err != nil {
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logrus.Debugf("Ignoring invalid digest %s:%s", algorithm, fi.Name())
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} else {
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ids = append(ids, ChainID(dgst))
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}
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}
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}
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}
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fileInfos, err := ioutil.ReadDir(filepath.Join(fms.root, "mounts"))
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if err != nil {
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if os.IsNotExist(err) {
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return ids, []string{}, nil
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}
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return nil, nil, err
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}
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var mounts []string
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for _, fi := range fileInfos {
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if fi.IsDir() {
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mounts = append(mounts, fi.Name())
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}
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}
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return ids, mounts, nil
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}
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func (fms *fileMetadataStore) Remove(layer ChainID) error {
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return os.RemoveAll(fms.getLayerDirectory(layer))
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}
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func (fms *fileMetadataStore) RemoveMount(mount string) error {
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return os.RemoveAll(fms.getMountDirectory(mount))
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}
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