cmd/dist, remotes: break out docker resolver
Allow usage of the experimental docker resolver as a package. There are very few changes to the consuming code, demonstrating the effectiveness of the abstraction. This move will allow future contributions to a more featured resolver implementation. Signed-off-by: Stephen J Day <stephen.day@docker.com>
This commit is contained in:
Stephen J Day
parent
4cc7cddf4b
commit
e1a361bff2
5 changed files with 314 additions and 302 deletions
8
cmd/dist/common.go
vendored
8
cmd/dist/common.go
vendored
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@ -1,6 +1,7 @@
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package main
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import (
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"context"
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"net"
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"path/filepath"
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"time"
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@ -8,6 +9,8 @@ import (
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"github.com/boltdb/bolt"
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"github.com/docker/containerd/content"
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"github.com/docker/containerd/images"
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"github.com/docker/containerd/remotes"
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"github.com/docker/containerd/remotes/docker"
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"github.com/urfave/cli"
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"google.golang.org/grpc"
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)
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@ -57,3 +60,8 @@ func getDB(ctx *cli.Context, readonly bool) (*bolt.DB, error) {
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return db, nil
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}
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// getResolver prepares the resolver from the environment and options.
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func getResolver(ctx context.Context) (remotes.Resolver, error) {
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return docker.NewResolver(), nil
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}
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294
cmd/dist/fetchobject.go
vendored
294
cmd/dist/fetchobject.go
vendored
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@ -2,31 +2,11 @@ package main
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import (
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contextpkg "context"
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"encoding/json"
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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"net/url"
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"os"
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"path"
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"strconv"
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"strings"
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"github.com/Sirupsen/logrus"
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"github.com/docker/containerd/log"
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"github.com/docker/containerd/reference"
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"github.com/docker/containerd/remotes"
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digest "github.com/opencontainers/go-digest"
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ocispec "github.com/opencontainers/image-spec/specs-go/v1"
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"github.com/pkg/errors"
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"github.com/urfave/cli"
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"golang.org/x/net/context/ctxhttp"
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)
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const (
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MediaTypeDockerSchema2Manifest = "application/vnd.docker.distribution.manifest.v2+json"
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MediaTypeDockerSchema2ManifestList = "application/vnd.docker.distribution.manifest.list.v2+json"
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)
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// TODO(stevvooe): Create "multi-fetch" mode that just takes a remote
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@ -85,277 +65,3 @@ var fetchObjectCommand = cli.Command{
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return nil
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},
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}
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// getResolver prepares the resolver from the environment and options.
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func getResolver(ctx contextpkg.Context) (remotes.Resolver, error) {
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return newDockerResolver(), nil
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}
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// NOTE(stevvooe): Most of the code below this point is prototype code to
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// demonstrate a very simplified docker.io fetcher. We have a lot of hard coded
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// values but we leave many of the details down to the fetcher, creating a lot
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// of room for ways to fetch content.
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type dockerFetcher struct {
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base url.URL
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token string
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}
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func (r *dockerFetcher) url(ps ...string) string {
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url := r.base
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url.Path = path.Join(url.Path, path.Join(ps...))
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return url.String()
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}
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func (r *dockerFetcher) Fetch(ctx contextpkg.Context, desc ocispec.Descriptor) (io.ReadCloser, error) {
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ctx = log.WithLogger(ctx, log.G(ctx).WithFields(
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logrus.Fields{
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"base": r.base.String(),
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"digest": desc.Digest,
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},
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))
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paths, err := getV2URLPaths(desc)
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if err != nil {
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return nil, err
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}
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for _, path := range paths {
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u := r.url(path)
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req, err := http.NewRequest(http.MethodGet, u, nil)
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if err != nil {
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return nil, err
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}
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req.Header.Set("Accept", strings.Join([]string{desc.MediaType, `*`}, ", "))
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resp, err := r.doRequest(ctx, req)
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if err != nil {
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return nil, err
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}
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if resp.StatusCode > 299 {
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if resp.StatusCode == http.StatusNotFound {
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continue // try one of the other urls.
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}
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resp.Body.Close()
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return nil, errors.Errorf("unexpected status code %v: %v", u, resp.Status)
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}
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return resp.Body, nil
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}
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return nil, errors.New("not found")
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}
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func (r *dockerFetcher) doRequest(ctx contextpkg.Context, req *http.Request) (*http.Response, error) {
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ctx = log.WithLogger(ctx, log.G(ctx).WithField("url", req.URL.String()))
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log.G(ctx).WithField("request.headers", req.Header).Debug("fetch content")
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if r.token != "" {
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req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", r.token))
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}
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resp, err := ctxhttp.Do(ctx, http.DefaultClient, req)
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if err != nil {
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return nil, err
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}
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log.G(ctx).WithFields(logrus.Fields{
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"status": resp.Status,
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"response.headers": resp.Header,
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}).Debug("fetch response received")
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return resp, err
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}
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type dockerResolver struct{}
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var _ remotes.Resolver = &dockerResolver{}
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func newDockerResolver() remotes.Resolver {
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return &dockerResolver{}
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}
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func (r *dockerResolver) Resolve(ctx contextpkg.Context, ref string) (string, ocispec.Descriptor, remotes.Fetcher, error) {
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refspec, err := reference.Parse(ref)
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if err != nil {
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return "", ocispec.Descriptor{}, nil, err
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}
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var (
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base url.URL
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token string
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)
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switch refspec.Hostname() {
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case "docker.io":
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base.Scheme = "https"
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base.Host = "registry-1.docker.io"
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prefix := strings.TrimPrefix(refspec.Locator, "docker.io/")
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base.Path = path.Join("/v2", prefix)
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token, err = getToken(ctx, "repository:"+prefix+":pull")
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if err != nil {
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return "", ocispec.Descriptor{}, nil, err
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}
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case "localhost:5000":
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base.Scheme = "http"
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base.Host = "localhost:5000"
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base.Path = path.Join("/v2", strings.TrimPrefix(refspec.Locator, "localhost:5000/"))
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default:
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return "", ocispec.Descriptor{}, nil, errors.Errorf("unsupported locator: %q", refspec.Locator)
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}
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fetcher := &dockerFetcher{
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base: base,
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token: token,
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}
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var (
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urls []string
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dgst = refspec.Digest()
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)
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if dgst != "" {
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if err := dgst.Validate(); err != nil {
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// need to fail here, since we can't actually resolve the invalid
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// digest.
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return "", ocispec.Descriptor{}, nil, err
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}
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// turns out, we have a valid digest, make a url.
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urls = append(urls, fetcher.url("manifests", dgst.String()))
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} else {
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urls = append(urls, fetcher.url("manifests", refspec.Object))
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}
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// fallback to blobs on not found.
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urls = append(urls, fetcher.url("blobs", dgst.String()))
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for _, u := range urls {
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req, err := http.NewRequest(http.MethodHead, u, nil)
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if err != nil {
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return "", ocispec.Descriptor{}, nil, err
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}
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// set headers for all the types we support for resolution.
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req.Header.Set("Accept", strings.Join([]string{
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MediaTypeDockerSchema2Manifest,
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MediaTypeDockerSchema2ManifestList,
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ocispec.MediaTypeImageManifest,
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ocispec.MediaTypeImageIndex, "*"}, ", "))
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log.G(ctx).Debug("resolving")
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resp, err := fetcher.doRequest(ctx, req)
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if err != nil {
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return "", ocispec.Descriptor{}, nil, err
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}
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resp.Body.Close() // don't care about body contents.
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if resp.StatusCode > 299 {
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if resp.StatusCode == http.StatusNotFound {
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continue
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}
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return "", ocispec.Descriptor{}, nil, errors.Errorf("unexpected status code %v: %v", u, resp.Status)
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}
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// this is the only point at which we trust the registry. we use the
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// content headers to assemble a descriptor for the name. when this becomes
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// more robust, we mostly get this information from a secure trust store.
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dgstHeader := digest.Digest(resp.Header.Get("Docker-Content-Digest"))
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if dgstHeader != "" {
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if err := dgstHeader.Validate(); err != nil {
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if err == nil {
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return "", ocispec.Descriptor{}, nil, errors.Errorf("%q in header not a valid digest", dgstHeader)
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}
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return "", ocispec.Descriptor{}, nil, errors.Wrapf(err, "%q in header not a valid digest", dgstHeader)
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}
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dgst = dgstHeader
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}
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if dgst == "" {
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return "", ocispec.Descriptor{}, nil, errors.Wrapf(err, "could not resolve digest for %v", ref)
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}
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var (
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size int64
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sizeHeader = resp.Header.Get("Content-Length")
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)
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size, err = strconv.ParseInt(sizeHeader, 10, 64)
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if err != nil || size < 0 {
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return "", ocispec.Descriptor{}, nil, errors.Wrapf(err, "%q in header not a valid size", sizeHeader)
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}
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desc := ocispec.Descriptor{
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Digest: dgst,
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MediaType: resp.Header.Get("Content-Type"), // need to strip disposition?
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Size: size,
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}
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log.G(ctx).WithField("desc.digest", desc.Digest).Debug("resolved")
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return ref, desc, fetcher, nil
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}
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return "", ocispec.Descriptor{}, nil, errors.Errorf("%v not found", ref)
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}
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func getToken(ctx contextpkg.Context, scopes ...string) (string, error) {
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var (
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u = url.URL{
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Scheme: "https",
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Host: "auth.docker.io",
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Path: "/token",
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}
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q = url.Values{
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"scope": scopes,
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"service": []string{"registry.docker.io"}, // usually comes from auth challenge
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}
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)
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u.RawQuery = q.Encode()
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log.G(ctx).WithField("token.url", u.String()).Debug("requesting token")
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resp, err := ctxhttp.Get(ctx, http.DefaultClient, u.String())
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if err != nil {
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return "", err
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}
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defer resp.Body.Close()
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if resp.StatusCode > 299 {
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return "", errors.Errorf("unexpected status code: %v %v", resp.StatusCode, resp.Status)
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}
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p, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return "", err
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}
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var tokenResponse struct {
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Token string `json:"token"`
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}
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if err := json.Unmarshal(p, &tokenResponse); err != nil {
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return "", err
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}
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return tokenResponse.Token, nil
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}
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// getV2URLPaths generates the candidate urls paths for the object based on the
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// set of hints and the provided object id. URLs are returned in the order of
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// most to least likely succeed.
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func getV2URLPaths(desc ocispec.Descriptor) ([]string, error) {
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var urls []string
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switch desc.MediaType {
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case MediaTypeDockerSchema2Manifest, MediaTypeDockerSchema2ManifestList,
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ocispec.MediaTypeImageManifest, ocispec.MediaTypeImageIndex:
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urls = append(urls, path.Join("manifests", desc.Digest.String()))
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}
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// always fallback to attempting to get the object out of the blobs store.
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urls = append(urls, path.Join("blobs", desc.Digest.String()))
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return urls, nil
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}
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|
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@ -11,14 +11,6 @@ import (
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"golang.org/x/sync/errgroup"
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)
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const (
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MediaTypeDockerSchema2Layer = "application/vnd.docker.image.rootfs.diff.tar"
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MediaTypeDockerSchema2LayerGzip = "application/vnd.docker.image.rootfs.diff.tar.gzip"
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MediaTypeDockerSchema2Config = "application/vnd.docker.container.image.v1+json"
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MediaTypeDockerSchema2Manifest = "application/vnd.docker.distribution.manifest.v2+json"
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MediaTypeDockerSchema2ManifestList = "application/vnd.docker.distribution.manifest.list.v2+json"
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)
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var SkipDesc = fmt.Errorf("skip descriptor")
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type Handler interface {
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|
|
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13
images/mediatypes.go
Normal file
13
images/mediatypes.go
Normal file
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@ -0,0 +1,13 @@
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package images
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// mediatype definitions for image components handled in containerd.
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//
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// oci components are generally referenced directly, although we may centralize
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// here for clarity.
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const (
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MediaTypeDockerSchema2Layer = "application/vnd.docker.image.rootfs.diff.tar"
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MediaTypeDockerSchema2LayerGzip = "application/vnd.docker.image.rootfs.diff.tar.gzip"
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MediaTypeDockerSchema2Config = "application/vnd.docker.container.image.v1+json"
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MediaTypeDockerSchema2Manifest = "application/vnd.docker.distribution.manifest.v2+json"
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MediaTypeDockerSchema2ManifestList = "application/vnd.docker.distribution.manifest.list.v2+json"
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)
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293
remotes/docker/resolver.go
Normal file
293
remotes/docker/resolver.go
Normal file
|
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@ -0,0 +1,293 @@
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package docker
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|
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import (
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"context"
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"encoding/json"
|
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"fmt"
|
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"io"
|
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"io/ioutil"
|
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"net/http"
|
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"net/url"
|
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"path"
|
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"strconv"
|
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"strings"
|
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|
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"github.com/Sirupsen/logrus"
|
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"github.com/docker/containerd/images"
|
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"github.com/docker/containerd/log"
|
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"github.com/docker/containerd/reference"
|
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"github.com/docker/containerd/remotes"
|
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digest "github.com/opencontainers/go-digest"
|
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ocispec "github.com/opencontainers/image-spec/specs-go/v1"
|
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"github.com/pkg/errors"
|
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"golang.org/x/net/context/ctxhttp"
|
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)
|
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|
||||
// NOTE(stevvooe): Most of the code below this point is prototype code to
|
||||
// demonstrate a very simplified docker.io fetcher. We have a lot of hard coded
|
||||
// values but we leave many of the details down to the fetcher, creating a lot
|
||||
// of room for ways to fetch content.
|
||||
|
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type dockerResolver struct{}
|
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|
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func NewResolver() remotes.Resolver {
|
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return &dockerResolver{}
|
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}
|
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|
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var _ remotes.Resolver = &dockerResolver{}
|
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|
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func (r *dockerResolver) Resolve(ctx context.Context, ref string) (string, ocispec.Descriptor, remotes.Fetcher, error) {
|
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refspec, err := reference.Parse(ref)
|
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if err != nil {
|
||||
return "", ocispec.Descriptor{}, nil, err
|
||||
}
|
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|
||||
var (
|
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base url.URL
|
||||
token string
|
||||
)
|
||||
|
||||
switch refspec.Hostname() {
|
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case "docker.io":
|
||||
base.Scheme = "https"
|
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base.Host = "registry-1.docker.io"
|
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prefix := strings.TrimPrefix(refspec.Locator, "docker.io/")
|
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base.Path = path.Join("/v2", prefix)
|
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token, err = getToken(ctx, "repository:"+prefix+":pull")
|
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if err != nil {
|
||||
return "", ocispec.Descriptor{}, nil, err
|
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}
|
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case "localhost:5000":
|
||||
base.Scheme = "http"
|
||||
base.Host = "localhost:5000"
|
||||
base.Path = path.Join("/v2", strings.TrimPrefix(refspec.Locator, "localhost:5000/"))
|
||||
default:
|
||||
return "", ocispec.Descriptor{}, nil, errors.Errorf("unsupported locator: %q", refspec.Locator)
|
||||
}
|
||||
|
||||
fetcher := &dockerFetcher{
|
||||
base: base,
|
||||
token: token,
|
||||
}
|
||||
|
||||
var (
|
||||
urls []string
|
||||
dgst = refspec.Digest()
|
||||
)
|
||||
|
||||
if dgst != "" {
|
||||
if err := dgst.Validate(); err != nil {
|
||||
// need to fail here, since we can't actually resolve the invalid
|
||||
// digest.
|
||||
return "", ocispec.Descriptor{}, nil, err
|
||||
}
|
||||
|
||||
// turns out, we have a valid digest, make a url.
|
||||
urls = append(urls, fetcher.url("manifests", dgst.String()))
|
||||
} else {
|
||||
urls = append(urls, fetcher.url("manifests", refspec.Object))
|
||||
}
|
||||
|
||||
// fallback to blobs on not found.
|
||||
urls = append(urls, fetcher.url("blobs", dgst.String()))
|
||||
|
||||
for _, u := range urls {
|
||||
req, err := http.NewRequest(http.MethodHead, u, nil)
|
||||
if err != nil {
|
||||
return "", ocispec.Descriptor{}, nil, err
|
||||
}
|
||||
|
||||
// set headers for all the types we support for resolution.
|
||||
req.Header.Set("Accept", strings.Join([]string{
|
||||
images.MediaTypeDockerSchema2Manifest,
|
||||
images.MediaTypeDockerSchema2ManifestList,
|
||||
ocispec.MediaTypeImageManifest,
|
||||
ocispec.MediaTypeImageIndex, "*"}, ", "))
|
||||
|
||||
log.G(ctx).Debug("resolving")
|
||||
resp, err := fetcher.doRequest(ctx, req)
|
||||
if err != nil {
|
||||
return "", ocispec.Descriptor{}, nil, err
|
||||
}
|
||||
resp.Body.Close() // don't care about body contents.
|
||||
|
||||
if resp.StatusCode > 299 {
|
||||
if resp.StatusCode == http.StatusNotFound {
|
||||
continue
|
||||
}
|
||||
return "", ocispec.Descriptor{}, nil, errors.Errorf("unexpected status code %v: %v", u, resp.Status)
|
||||
}
|
||||
|
||||
// this is the only point at which we trust the registry. we use the
|
||||
// content headers to assemble a descriptor for the name. when this becomes
|
||||
// more robust, we mostly get this information from a secure trust store.
|
||||
dgstHeader := digest.Digest(resp.Header.Get("Docker-Content-Digest"))
|
||||
|
||||
if dgstHeader != "" {
|
||||
if err := dgstHeader.Validate(); err != nil {
|
||||
if err == nil {
|
||||
return "", ocispec.Descriptor{}, nil, errors.Errorf("%q in header not a valid digest", dgstHeader)
|
||||
}
|
||||
return "", ocispec.Descriptor{}, nil, errors.Wrapf(err, "%q in header not a valid digest", dgstHeader)
|
||||
}
|
||||
dgst = dgstHeader
|
||||
}
|
||||
|
||||
if dgst == "" {
|
||||
return "", ocispec.Descriptor{}, nil, errors.Wrapf(err, "could not resolve digest for %v", ref)
|
||||
}
|
||||
|
||||
var (
|
||||
size int64
|
||||
sizeHeader = resp.Header.Get("Content-Length")
|
||||
)
|
||||
|
||||
size, err = strconv.ParseInt(sizeHeader, 10, 64)
|
||||
if err != nil || size < 0 {
|
||||
return "", ocispec.Descriptor{}, nil, errors.Wrapf(err, "%q in header not a valid size", sizeHeader)
|
||||
}
|
||||
|
||||
desc := ocispec.Descriptor{
|
||||
Digest: dgst,
|
||||
MediaType: resp.Header.Get("Content-Type"), // need to strip disposition?
|
||||
Size: size,
|
||||
}
|
||||
|
||||
log.G(ctx).WithField("desc.digest", desc.Digest).Debug("resolved")
|
||||
return ref, desc, fetcher, nil
|
||||
}
|
||||
|
||||
return "", ocispec.Descriptor{}, nil, errors.Errorf("%v not found", ref)
|
||||
}
|
||||
|
||||
type dockerFetcher struct {
|
||||
base url.URL
|
||||
token string
|
||||
}
|
||||
|
||||
func (r *dockerFetcher) Fetch(ctx context.Context, desc ocispec.Descriptor) (io.ReadCloser, error) {
|
||||
ctx = log.WithLogger(ctx, log.G(ctx).WithFields(
|
||||
logrus.Fields{
|
||||
"base": r.base.String(),
|
||||
"digest": desc.Digest,
|
||||
},
|
||||
))
|
||||
|
||||
paths, err := getV2URLPaths(desc)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
for _, path := range paths {
|
||||
u := r.url(path)
|
||||
|
||||
req, err := http.NewRequest(http.MethodGet, u, nil)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
req.Header.Set("Accept", strings.Join([]string{desc.MediaType, `*`}, ", "))
|
||||
resp, err := r.doRequest(ctx, req)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
if resp.StatusCode > 299 {
|
||||
if resp.StatusCode == http.StatusNotFound {
|
||||
continue // try one of the other urls.
|
||||
}
|
||||
resp.Body.Close()
|
||||
return nil, errors.Errorf("unexpected status code %v: %v", u, resp.Status)
|
||||
}
|
||||
|
||||
return resp.Body, nil
|
||||
}
|
||||
|
||||
return nil, errors.New("not found")
|
||||
}
|
||||
|
||||
func (r *dockerFetcher) url(ps ...string) string {
|
||||
url := r.base
|
||||
url.Path = path.Join(url.Path, path.Join(ps...))
|
||||
return url.String()
|
||||
}
|
||||
|
||||
func (r *dockerFetcher) doRequest(ctx context.Context, req *http.Request) (*http.Response, error) {
|
||||
ctx = log.WithLogger(ctx, log.G(ctx).WithField("url", req.URL.String()))
|
||||
log.G(ctx).WithField("request.headers", req.Header).Debug("fetch content")
|
||||
if r.token != "" {
|
||||
req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", r.token))
|
||||
}
|
||||
|
||||
resp, err := ctxhttp.Do(ctx, http.DefaultClient, req)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
log.G(ctx).WithFields(logrus.Fields{
|
||||
"status": resp.Status,
|
||||
"response.headers": resp.Header,
|
||||
}).Debug("fetch response received")
|
||||
|
||||
return resp, err
|
||||
}
|
||||
|
||||
func getToken(ctx context.Context, scopes ...string) (string, error) {
|
||||
var (
|
||||
u = url.URL{
|
||||
Scheme: "https",
|
||||
Host: "auth.docker.io",
|
||||
Path: "/token",
|
||||
}
|
||||
|
||||
q = url.Values{
|
||||
"scope": scopes,
|
||||
"service": []string{"registry.docker.io"}, // usually comes from auth challenge
|
||||
}
|
||||
)
|
||||
|
||||
u.RawQuery = q.Encode()
|
||||
|
||||
log.G(ctx).WithField("token.url", u.String()).Debug("requesting token")
|
||||
resp, err := ctxhttp.Get(ctx, http.DefaultClient, u.String())
|
||||
if err != nil {
|
||||
return "", err
|
||||
}
|
||||
defer resp.Body.Close()
|
||||
|
||||
if resp.StatusCode > 299 {
|
||||
return "", errors.Errorf("unexpected status code: %v %v", resp.StatusCode, resp.Status)
|
||||
}
|
||||
|
||||
p, err := ioutil.ReadAll(resp.Body)
|
||||
if err != nil {
|
||||
return "", err
|
||||
}
|
||||
|
||||
var tokenResponse struct {
|
||||
Token string `json:"token"`
|
||||
}
|
||||
|
||||
if err := json.Unmarshal(p, &tokenResponse); err != nil {
|
||||
return "", err
|
||||
}
|
||||
|
||||
return tokenResponse.Token, nil
|
||||
}
|
||||
|
||||
// getV2URLPaths generates the candidate urls paths for the object based on the
|
||||
// set of hints and the provided object id. URLs are returned in the order of
|
||||
// most to least likely succeed.
|
||||
func getV2URLPaths(desc ocispec.Descriptor) ([]string, error) {
|
||||
var urls []string
|
||||
|
||||
switch desc.MediaType {
|
||||
case images.MediaTypeDockerSchema2Manifest, images.MediaTypeDockerSchema2ManifestList,
|
||||
ocispec.MediaTypeImageManifest, ocispec.MediaTypeImageIndex:
|
||||
urls = append(urls, path.Join("manifests", desc.Digest.String()))
|
||||
}
|
||||
|
||||
// always fallback to attempting to get the object out of the blobs store.
|
||||
urls = append(urls, path.Join("blobs", desc.Digest.String()))
|
||||
|
||||
return urls, nil
|
||||
}
|
||||
Loading…
Reference in a new issue