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export.go
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export.go
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package oci
import (
"context"
"strconv"
"time"
"github.com/containerd/containerd/images"
"github.com/containerd/containerd/images/oci"
"github.com/docker/distribution/reference"
"github.com/moby/buildkit/exporter"
"github.com/moby/buildkit/exporter/containerimage"
"github.com/moby/buildkit/session"
"github.com/moby/buildkit/session/filesync"
"github.com/moby/buildkit/util/dockerexporter"
"github.com/moby/buildkit/util/progress"
ocispec "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/pkg/errors"
)
type ExporterVariant string
const (
keyImageName = "name"
VariantOCI = "oci"
VariantDocker = "docker"
ociTypes = "oci-mediatypes"
)
type Opt struct {
SessionManager *session.Manager
ImageWriter *containerimage.ImageWriter
Variant ExporterVariant
}
type imageExporter struct {
opt Opt
}
func New(opt Opt) (exporter.Exporter, error) {
im := &imageExporter{opt: opt}
return im, nil
}
func normalize(name string) (string, error) {
if name == "" {
return "", nil
}
parsed, err := reference.ParseNormalizedNamed(name)
if err != nil {
return "", errors.Wrapf(err, "failed to parse %s", name)
}
return reference.TagNameOnly(parsed).String(), nil
}
func (e *imageExporter) Resolve(ctx context.Context, opt map[string]string) (exporter.ExporterInstance, error) {
id := session.FromContext(ctx)
if id == "" {
return nil, errors.New("could not access local files without session")
}
timeoutCtx, cancel := context.WithTimeout(ctx, 5*time.Second)
defer cancel()
caller, err := e.opt.SessionManager.Get(timeoutCtx, id)
if err != nil {
return nil, err
}
var ot *bool
i := &imageExporterInstance{imageExporter: e, caller: caller}
for k, v := range opt {
switch k {
case keyImageName:
i.name = v
if i.name != "*" {
i.name, err = normalize(i.name)
if err != nil {
return nil, err
}
}
case ociTypes:
ot = new(bool)
if v == "" {
*ot = true
continue
}
b, err := strconv.ParseBool(v)
if err != nil {
return nil, errors.Wrapf(err, "non-bool value specified for %s", k)
}
*ot = b
default:
if i.meta == nil {
i.meta = make(map[string][]byte)
}
i.meta[k] = []byte(v)
}
}
if ot == nil {
i.ociTypes = e.opt.Variant == VariantOCI
} else {
i.ociTypes = *ot
}
return i, nil
}
type imageExporterInstance struct {
*imageExporter
meta map[string][]byte
caller session.Caller
name string
ociTypes bool
}
func (e *imageExporterInstance) Name() string {
return "exporting to oci image format"
}
func (e *imageExporterInstance) Export(ctx context.Context, src exporter.Source) (map[string]string, error) {
if e.opt.Variant == VariantDocker && len(src.Refs) > 0 {
return nil, errors.Errorf("docker exporter does not currently support exporting manifest lists")
}
if src.Metadata == nil {
src.Metadata = make(map[string][]byte)
}
for k, v := range e.meta {
src.Metadata[k] = v
}
desc, err := e.opt.ImageWriter.Commit(ctx, src, e.ociTypes)
if err != nil {
return nil, err
}
defer func() {
e.opt.ImageWriter.ContentStore().Delete(context.TODO(), desc.Digest)
}()
if desc.Annotations == nil {
desc.Annotations = map[string]string{}
}
desc.Annotations[ocispec.AnnotationCreated] = time.Now().UTC().Format(time.RFC3339)
resp := make(map[string]string)
if n, ok := src.Metadata["image.name"]; e.name == "*" && ok {
if e.name, err = normalize(string(n)); err != nil {
return nil, err
}
}
if e.name != "" {
resp["image.name"] = e.name
}
exp, err := getExporter(e.opt.Variant, e.name)
if err != nil {
return nil, err
}
w, err := filesync.CopyFileWriter(ctx, e.caller)
if err != nil {
return nil, err
}
report := oneOffProgress(ctx, "sending tarball")
if err := exp.Export(ctx, e.opt.ImageWriter.ContentStore(), *desc, w); err != nil {
w.Close()
return nil, report(err)
}
return resp, report(w.Close())
}
func oneOffProgress(ctx context.Context, id string) func(err error) error {
pw, _, _ := progress.FromContext(ctx)
now := time.Now()
st := progress.Status{
Started: &now,
}
pw.Write(id, st)
return func(err error) error {
// TODO: set error on status
now := time.Now()
st.Completed = &now
pw.Write(id, st)
pw.Close()
return err
}
}
func getExporter(variant ExporterVariant, name string) (images.Exporter, error) {
switch variant {
case VariantOCI:
if name != "" {
return nil, errors.New("oci exporter cannot export named image")
}
return oci.ResolveV1ExportOpt(oci.WithAllPlatforms(true))
case VariantDocker:
return &dockerexporter.DockerExporter{Name: name}, nil
default:
return nil, errors.Errorf("invalid variant %q", variant)
}
}