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conversion_store.go
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conversion_store.go
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package docker2aci
import (
"crypto/sha512"
"fmt"
"hash"
"io"
"io/ioutil"
"os"
"github.com/coreos/rkt/Godeps/_workspace/src/github.com/appc/spec/aci"
"github.com/coreos/rkt/Godeps/_workspace/src/github.com/appc/spec/schema"
"github.com/coreos/rkt/Godeps/_workspace/src/github.com/appc/spec/schema/types"
)
const (
hashPrefix = "sha512-"
)
type aciInfo struct {
path string
key string
ImageManifest *schema.ImageManifest
}
// ConversionStore is an simple implementation of the acirenderer.ACIRegistry
// interface. It stores the Docker layers converted to ACI so we can take
// advantage of acirenderer to generate a squashed ACI Image.
type ConversionStore struct {
acis map[string]*aciInfo
}
func NewConversionStore() *ConversionStore {
return &ConversionStore{acis: make(map[string]*aciInfo)}
}
func (ms *ConversionStore) WriteACI(path string) (string, error) {
f, err := os.Open(path)
if err != nil {
return "", err
}
defer f.Close()
cr, err := aci.NewCompressedReader(f)
if err != nil {
return "", err
}
h := sha512.New()
r := io.TeeReader(cr, h)
// read the file so we can get the hash
if _, err := io.Copy(ioutil.Discard, r); err != nil {
return "", fmt.Errorf("error reading ACI: %v", err)
}
im, err := aci.ManifestFromImage(f)
if err != nil {
return "", err
}
key := ms.HashToKey(h)
ms.acis[key] = &aciInfo{path: path, key: key, ImageManifest: im}
return key, nil
}
func (ms *ConversionStore) GetImageManifest(key string) (*schema.ImageManifest, error) {
aci, ok := ms.acis[key]
if !ok {
return nil, fmt.Errorf("aci with key: %s not found", key)
}
return aci.ImageManifest, nil
}
func (ms *ConversionStore) GetACI(name types.ACName, labels types.Labels) (string, error) {
for _, aci := range ms.acis {
// we implement this function to comply with the interface so don't
// bother implementing a proper label check
if aci.ImageManifest.Name.String() == name.String() {
return aci.key, nil
}
}
return "", fmt.Errorf("aci not found")
}
func (ms *ConversionStore) ReadStream(key string) (io.ReadCloser, error) {
img, ok := ms.acis[key]
if !ok {
return nil, fmt.Errorf("stream for key: %s not found", key)
}
f, err := os.Open(img.path)
if err != nil {
return nil, fmt.Errorf("error opening aci: %s", img.path)
}
tr, err := aci.NewCompressedReader(f)
if err != nil {
return nil, err
}
return ioutil.NopCloser(tr), nil
}
func (ms *ConversionStore) ResolveKey(key string) (string, error) {
return key, nil
}
func (ms *ConversionStore) HashToKey(h hash.Hash) string {
s := h.Sum(nil)
return fmt.Sprintf("%s%x", hashPrefix, s)
}