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ocilayout.go
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/
ocilayout.go
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package ocilayout
import (
"io"
"io/ioutil"
"os"
"path/filepath"
"github.com/pivotal/image-relocation/pkg/image"
"github.com/pivotal/image-relocation/pkg/registry"
"github.com/pivotal/image-relocation/pkg/registry/ggcr"
"github.com/deislabs/cnab-go/imagestore"
)
// ociLayout is an image store which stores images as an OCI image layout.
type ociLayout struct {
layout registry.Layout
logs io.Writer
}
func Create(options ...imagestore.Option) (imagestore.Store, error) {
parms := imagestore.Create(options...)
layoutDir := filepath.Join(parms.ArchiveDir, "artifacts", "layout")
if err := os.MkdirAll(layoutDir, 0755); err != nil {
return nil, err
}
layout, err := ggcr.NewRegistryClient().NewLayout(layoutDir)
if err != nil {
return nil, err
}
return &ociLayout{
layout: layout,
logs: parms.Logs,
}, nil
}
func LocateOciLayout(archiveDir string) (imagestore.Store, error) {
layoutDir := filepath.Join(archiveDir, "artifacts", "layout")
if _, err := os.Stat(layoutDir); os.IsNotExist(err) {
return nil, err
}
layout, err := ggcr.NewRegistryClient().ReadLayout(layoutDir)
if err != nil {
return nil, err
}
return &ociLayout{
layout: layout,
logs: ioutil.Discard,
}, nil
}
func (o *ociLayout) Add(im string) (string, error) {
n, err := image.NewName(im)
if err != nil {
return "", err
}
dig, err := o.layout.Add(n)
if err != nil {
return "", err
}
return dig.String(), nil
}
func (o *ociLayout) Push(dig image.Digest, src image.Name, dst image.Name) error {
if dig == image.EmptyDigest {
var err error
dig, err = o.layout.Find(src)
if err != nil {
return err
}
}
return o.layout.Push(dig, dst)
}