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export.go
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export.go
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package containerimage
import (
"context"
"fmt"
"strconv"
"strings"
"time"
"github.com/containerd/containerd/content"
"github.com/containerd/containerd/errdefs"
"github.com/containerd/containerd/images"
"github.com/containerd/containerd/leases"
"github.com/containerd/containerd/platforms"
"github.com/containerd/containerd/remotes/docker"
"github.com/containerd/containerd/rootfs"
"github.com/moby/buildkit/cache/blobs"
"github.com/moby/buildkit/exporter"
"github.com/moby/buildkit/session"
"github.com/moby/buildkit/snapshot"
"github.com/moby/buildkit/util/leaseutil"
"github.com/moby/buildkit/util/push"
digest "github.com/opencontainers/go-digest"
"github.com/opencontainers/image-spec/identity"
ocispec "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/pkg/errors"
)
const (
keyImageName = "name"
keyPush = "push"
keyPushByDigest = "push-by-digest"
keyInsecure = "registry.insecure"
keyUnpack = "unpack"
keyDanglingPrefix = "dangling-name-prefix"
keyNameCanonical = "name-canonical"
keyLayerCompression = "compression"
ociTypes = "oci-mediatypes"
)
type Opt struct {
SessionManager *session.Manager
ImageWriter *ImageWriter
Images images.Store
RegistryHosts docker.RegistryHosts
LeaseManager leases.Manager
}
type imageExporter struct {
opt Opt
}
// New returns a new containerimage exporter instance that supports exporting
// to an image store and pushing the image to registry.
// This exporter supports following values in returned kv map:
// - containerimage.digest - The digest of the root manifest for the image.
func New(opt Opt) (exporter.Exporter, error) {
im := &imageExporter{opt: opt}
return im, nil
}
func (e *imageExporter) Resolve(ctx context.Context, opt map[string]string) (exporter.ExporterInstance, error) {
i := &imageExporterInstance{
imageExporter: e,
layerCompression: blobs.DefaultCompression,
}
for k, v := range opt {
switch k {
case keyImageName:
i.targetName = v
case keyPush:
if v == "" {
i.push = true
continue
}
b, err := strconv.ParseBool(v)
if err != nil {
return nil, errors.Wrapf(err, "non-bool value specified for %s", k)
}
i.push = b
case keyPushByDigest:
if v == "" {
i.pushByDigest = true
continue
}
b, err := strconv.ParseBool(v)
if err != nil {
return nil, errors.Wrapf(err, "non-bool value specified for %s", k)
}
i.pushByDigest = b
case keyInsecure:
if v == "" {
i.insecure = true
continue
}
b, err := strconv.ParseBool(v)
if err != nil {
return nil, errors.Wrapf(err, "non-bool value specified for %s", k)
}
i.insecure = b
case keyUnpack:
if v == "" {
i.unpack = true
continue
}
b, err := strconv.ParseBool(v)
if err != nil {
return nil, errors.Wrapf(err, "non-bool value specified for %s", k)
}
i.unpack = b
case ociTypes:
if v == "" {
i.ociTypes = true
continue
}
b, err := strconv.ParseBool(v)
if err != nil {
return nil, errors.Wrapf(err, "non-bool value specified for %s", k)
}
i.ociTypes = b
case keyDanglingPrefix:
i.danglingPrefix = v
case keyNameCanonical:
if v == "" {
i.nameCanonical = true
continue
}
b, err := strconv.ParseBool(v)
if err != nil {
return nil, errors.Wrapf(err, "non-bool value specified for %s", k)
}
i.nameCanonical = b
case keyLayerCompression:
switch v {
case "gzip":
i.layerCompression = blobs.Gzip
case "uncompressed":
i.layerCompression = blobs.Uncompressed
default:
return nil, errors.Errorf("unsupported layer compression type: %v", v)
}
default:
if i.meta == nil {
i.meta = make(map[string][]byte)
}
i.meta[k] = []byte(v)
}
}
return i, nil
}
type imageExporterInstance struct {
*imageExporter
targetName string
push bool
pushByDigest bool
unpack bool
insecure bool
ociTypes bool
nameCanonical bool
danglingPrefix string
layerCompression blobs.CompressionType
meta map[string][]byte
}
func (e *imageExporterInstance) Name() string {
return "exporting to image"
}
func (e *imageExporterInstance) Export(ctx context.Context, src exporter.Source) (map[string]string, error) {
if src.Metadata == nil {
src.Metadata = make(map[string][]byte)
}
for k, v := range e.meta {
src.Metadata[k] = v
}
ctx, done, err := leaseutil.WithLease(ctx, e.opt.LeaseManager, leaseutil.MakeTemporary)
if err != nil {
return nil, err
}
defer done(context.TODO())
desc, err := e.opt.ImageWriter.Commit(ctx, src, e.ociTypes, e.layerCompression)
if err != nil {
return nil, err
}
defer func() {
e.opt.ImageWriter.ContentStore().Delete(context.TODO(), desc.Digest)
}()
resp := make(map[string]string)
if n, ok := src.Metadata["image.name"]; e.targetName == "*" && ok {
e.targetName = string(n)
}
nameCanonical := e.nameCanonical
if e.targetName == "" && e.danglingPrefix != "" {
e.targetName = e.danglingPrefix + "@" + desc.Digest.String()
nameCanonical = false
}
if e.targetName != "" {
targetNames := strings.Split(e.targetName, ",")
for _, targetName := range targetNames {
if e.opt.Images != nil {
tagDone := oneOffProgress(ctx, "naming to "+targetName)
img := images.Image{
Target: *desc,
CreatedAt: time.Now(),
}
sfx := []string{""}
if nameCanonical {
sfx = append(sfx, "@"+desc.Digest.String())
}
for _, sfx := range sfx {
img.Name = targetName + sfx
if _, err := e.opt.Images.Update(ctx, img); err != nil {
if !errdefs.IsNotFound(err) {
return nil, tagDone(err)
}
if _, err := e.opt.Images.Create(ctx, img); err != nil {
return nil, tagDone(err)
}
}
}
tagDone(nil)
if e.unpack {
if err := e.unpackImage(ctx, img); err != nil {
return nil, err
}
}
}
if e.push {
if err := push.Push(ctx, e.opt.SessionManager, e.opt.ImageWriter.ContentStore(), desc.Digest, targetName, e.insecure, e.opt.RegistryHosts, e.pushByDigest); err != nil {
return nil, err
}
}
}
resp["image.name"] = e.targetName
}
resp["containerimage.digest"] = desc.Digest.String()
return resp, nil
}
func (e *imageExporterInstance) unpackImage(ctx context.Context, img images.Image) (err0 error) {
unpackDone := oneOffProgress(ctx, "unpacking to "+img.Name)
defer func() {
unpackDone(err0)
}()
var (
contentStore = e.opt.ImageWriter.ContentStore()
applier = e.opt.ImageWriter.Applier()
snapshotter = e.opt.ImageWriter.Snapshotter()
)
// fetch manifest by default platform
manifest, err := images.Manifest(ctx, contentStore, img.Target, platforms.Default())
if err != nil {
return err
}
layers, err := getLayers(ctx, contentStore, manifest)
if err != nil {
return err
}
// get containerd snapshotter
ctrdSnapshotter, release := snapshot.NewContainerdSnapshotter(snapshotter)
defer release()
var chain []digest.Digest
for _, layer := range layers {
if _, err := rootfs.ApplyLayer(ctx, layer, chain, ctrdSnapshotter, applier); err != nil {
return err
}
chain = append(chain, layer.Diff.Digest)
}
var (
keyGCLabel = fmt.Sprintf("containerd.io/gc.ref.snapshot.%s", snapshotter.Name())
valueGCLabel = identity.ChainID(chain).String()
)
cinfo := content.Info{
Digest: manifest.Config.Digest,
Labels: map[string]string{keyGCLabel: valueGCLabel},
}
_, err = contentStore.Update(ctx, cinfo, fmt.Sprintf("labels.%s", keyGCLabel))
return err
}
func getLayers(ctx context.Context, contentStore content.Store, manifest ocispec.Manifest) ([]rootfs.Layer, error) {
diffIDs, err := images.RootFS(ctx, contentStore, manifest.Config)
if err != nil {
return nil, errors.Wrap(err, "failed to resolve rootfs")
}
if len(diffIDs) != len(manifest.Layers) {
return nil, errors.Errorf("mismatched image rootfs and manifest layers")
}
layers := make([]rootfs.Layer, len(diffIDs))
for i := range diffIDs {
layers[i].Diff = ocispec.Descriptor{
MediaType: ocispec.MediaTypeImageLayer,
Digest: diffIDs[i],
}
layers[i].Blob = manifest.Layers[i]
}
return layers, nil
}