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