mirror of https://github.com/docker/cli.git
114 lines
2.8 KiB
Go
114 lines
2.8 KiB
Go
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package ociindex
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import (
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"encoding/json"
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"io/ioutil"
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"os"
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"github.com/gofrs/flock"
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"github.com/opencontainers/image-spec/specs-go/v1"
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"github.com/pkg/errors"
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)
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const (
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// IndexJSONLockFileSuffix is the suffix of the lock file
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IndexJSONLockFileSuffix = ".lock"
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)
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// PutDescToIndex puts desc to index with tag.
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// Existing manifests with the same tag will be removed from the index.
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func PutDescToIndex(index *v1.Index, desc v1.Descriptor, tag string) error {
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if index == nil {
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index = &v1.Index{}
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}
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if index.SchemaVersion == 0 {
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index.SchemaVersion = 2
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}
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if tag != "" {
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if desc.Annotations == nil {
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desc.Annotations = make(map[string]string)
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}
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desc.Annotations[v1.AnnotationRefName] = tag
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// remove existing manifests with the same tag
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var manifests []v1.Descriptor
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for _, m := range index.Manifests {
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if m.Annotations[v1.AnnotationRefName] != tag {
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manifests = append(manifests, m)
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}
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}
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index.Manifests = manifests
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}
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index.Manifests = append(index.Manifests, desc)
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return nil
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}
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func PutDescToIndexJSONFileLocked(indexJSONPath string, desc v1.Descriptor, tag string) error {
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lockPath := indexJSONPath + IndexJSONLockFileSuffix
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lock := flock.New(lockPath)
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locked, err := lock.TryLock()
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if err != nil {
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return errors.Wrapf(err, "could not lock %s", lockPath)
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}
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if !locked {
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return errors.Errorf("could not lock %s", lockPath)
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}
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defer func() {
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lock.Unlock()
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os.RemoveAll(lockPath)
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}()
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f, err := os.OpenFile(indexJSONPath, os.O_RDWR|os.O_CREATE, 0644)
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if err != nil {
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return errors.Wrapf(err, "could not open %s", indexJSONPath)
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}
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defer f.Close()
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var idx v1.Index
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b, err := ioutil.ReadAll(f)
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if err != nil {
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return errors.Wrapf(err, "could not read %s", indexJSONPath)
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}
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if len(b) > 0 {
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if err := json.Unmarshal(b, &idx); err != nil {
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return errors.Wrapf(err, "could not unmarshal %s (%q)", indexJSONPath, string(b))
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}
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}
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if err = PutDescToIndex(&idx, desc, tag); err != nil {
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return err
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}
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b, err = json.Marshal(idx)
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if err != nil {
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return err
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}
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if _, err = f.WriteAt(b, 0); err != nil {
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return err
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}
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if err = f.Truncate(int64(len(b))); 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 ReadIndexJSONFileLocked(indexJSONPath string) (*v1.Index, error) {
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lockPath := indexJSONPath + IndexJSONLockFileSuffix
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lock := flock.New(lockPath)
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locked, err := lock.TryRLock()
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if err != nil {
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return nil, errors.Wrapf(err, "could not lock %s", lockPath)
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}
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if !locked {
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return nil, errors.Errorf("could not lock %s", lockPath)
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}
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defer func() {
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lock.Unlock()
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os.RemoveAll(lockPath)
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}()
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b, err := ioutil.ReadFile(indexJSONPath)
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if err != nil {
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return nil, errors.Wrapf(err, "could not read %s", indexJSONPath)
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}
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var idx v1.Index
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if err := json.Unmarshal(b, &idx); err != nil {
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return nil, errors.Wrapf(err, "could not unmarshal %s (%q)", indexJSONPath, string(b))
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}
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return &idx, nil
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}
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