forked from estesp/manifest-tool
/
inspect_v1.go
173 lines (160 loc) · 5.26 KB
/
inspect_v1.go
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package docker
import (
"encoding/json"
"errors"
"fmt"
"strings"
"github.com/docker/distribution"
"github.com/docker/distribution/manifest/schema1"
"github.com/docker/distribution/reference"
"github.com/docker/distribution/registry/client/transport"
engineTypes "github.com/docker/docker/api/types"
dockerdistribution "github.com/docker/docker/distribution"
"github.com/docker/docker/dockerversion"
"github.com/docker/docker/image"
"github.com/docker/docker/image/v1"
"github.com/docker/docker/registry"
"github.com/estesp/manifest-tool/types"
"github.com/sirupsen/logrus"
"golang.org/x/net/context"
)
type v1ManifestFetcher struct {
endpoint registry.APIEndpoint
repoInfo *registry.RepositoryInfo
repo distribution.Repository
confirmedV2 bool
// wrap in a config?
authConfig engineTypes.AuthConfig
service registry.Service
session *registry.Session
}
func (mf *v1ManifestFetcher) Fetch(ctx context.Context, ref reference.Named) ([]types.ImageInspect, error) {
if _, isCanonical := ref.(reference.Canonical); isCanonical {
// Allowing fallback, because HTTPS v1 is before HTTP v2
return nil, fallbackError{
err: dockerdistribution.ErrNoSupport{Err: errors.New("Cannot pull by digest with v1 registry")},
}
}
tlsConfig, err := mf.service.TLSConfig(mf.repoInfo.Index.Name)
if err != nil {
return nil, err
}
// Adds Docker-specific headers as well as user-specified headers (metaHeaders)
tr := transport.NewTransport(
registry.NewTransport(tlsConfig),
//registry.Headers(mf.config.MetaHeaders)...,
registry.Headers(dockerversion.DockerUserAgent(nil), nil)...,
)
client := registry.HTTPClient(tr)
//v1Endpoint := mf.endpoint.ToV1Endpoint(mf.config.MetaHeaders)
v1Endpoint := mf.endpoint.ToV1Endpoint(dockerversion.DockerUserAgent(nil), nil)
mf.session, err = registry.NewSession(client, &mf.authConfig, v1Endpoint)
if err != nil {
logrus.Debugf("Fallback from error: %s", err)
return nil, fallbackError{err: err}
}
imgsInspect, err := mf.fetchWithSession(ctx, ref)
if err != nil {
return nil, err
}
if len(imgsInspect) > 1 {
return nil, fmt.Errorf("Found more than one image in V1 fetch!? %v", imgsInspect)
}
imgsInspect[0].MediaType = schema1.MediaTypeManifest
return imgsInspect, nil
}
func (mf *v1ManifestFetcher) fetchWithSession(ctx context.Context, ref reference.Named) ([]types.ImageInspect, error) {
var (
imageList = []types.ImageInspect{}
pulledImg *image.Image
)
repoData, err := mf.session.GetRepositoryData(mf.repoInfo.Name)
if err != nil {
if strings.Contains(err.Error(), "HTTP code: 404") {
return nil, fmt.Errorf("Error: image %s not found", reference.Path(mf.repoInfo.Name))
}
// Unexpected HTTP error
return nil, err
}
var tagsList map[string]string
tagsList, err = mf.session.GetRemoteTags(repoData.Endpoints, mf.repoInfo.Name)
if err != nil {
logrus.Errorf("unable to get remote tags: %s", err)
return nil, err
}
logrus.Debugf("Retrieving the tag list")
tagged, isTagged := ref.(reference.NamedTagged)
var tagID, tag string
if isTagged {
tag = tagged.Tag()
tagsList[tagged.Tag()] = tagID
} else {
ref = reference.TagNameOnly(ref)
tagged, _ := ref.(reference.NamedTagged)
tag = tagged.Tag()
tagsList[tagged.Tag()] = tagID
}
tagID, err = mf.session.GetRemoteTag(repoData.Endpoints, mf.repoInfo.Name, tag)
if err == registry.ErrRepoNotFound {
return nil, fmt.Errorf("Tag %s not found in repository %s", tag, mf.repoInfo.Name.Name())
}
if err != nil {
logrus.Errorf("unable to get remote tags: %s", err)
return nil, err
}
tagList := []string{}
for tag := range tagsList {
tagList = append(tagList, tag)
}
img := repoData.ImgList[tagID]
for _, ep := range mf.repoInfo.Index.Mirrors {
if pulledImg, err = mf.pullImageJSON(img.ID, ep); err != nil {
// Don't report errors when pulling from mirrors.
logrus.Debugf("Error pulling image json of %s:%s, mirror: %s, %s", mf.repoInfo.Name.Name(), img.Tag, ep, err)
continue
}
break
}
if pulledImg == nil {
for _, ep := range repoData.Endpoints {
if pulledImg, err = mf.pullImageJSON(img.ID, ep); err != nil {
// It's not ideal that only the last error is returned, it would be better to concatenate the errors.
logrus.Infof("Error pulling image json of %s:%s, endpoint: %s, %v", mf.repoInfo.Name.Name(), img.Tag, ep, err)
continue
}
break
}
}
if err != nil {
return nil, fmt.Errorf("Error pulling image (%s) from %s, %v", img.Tag, mf.repoInfo.Name.Name(), err)
}
if pulledImg == nil {
return nil, fmt.Errorf("No such image %s:%s", mf.repoInfo.Name.Name(), tag)
}
imageInsp := makeImageInspect(pulledImg, tag, manifestInfo{}, schema1.MediaTypeManifest, tagList)
imageList = append(imageList, *imageInsp)
return imageList, nil
}
func (mf *v1ManifestFetcher) pullImageJSON(imgID, endpoint string) (*image.Image, error) {
imgJSON, _, err := mf.session.GetRemoteImageJSON(imgID, endpoint)
if err != nil {
return nil, err
}
h, err := v1.HistoryFromConfig(imgJSON, false)
if err != nil {
return nil, err
}
configRaw, err := makeRawConfigFromV1Config(imgJSON, image.NewRootFS(), []image.History{h})
if err != nil {
return nil, err
}
config, err := json.Marshal(configRaw)
if err != nil {
return nil, err
}
img, err := image.NewFromJSON(config)
if err != nil {
return nil, err
}
return img, nil
}