142 lines
4.4 KiB
Go
142 lines
4.4 KiB
Go
/*
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Copyright 2014 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package dockertools
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import (
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"fmt"
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"net/http"
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"strings"
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"github.com/docker/docker/pkg/jsonmessage"
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dockertypes "github.com/docker/engine-api/types"
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"github.com/golang/glog"
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utilerrors "k8s.io/apimachinery/pkg/util/errors"
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"k8s.io/kubernetes/pkg/api/v1"
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"k8s.io/kubernetes/pkg/credentialprovider"
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"k8s.io/kubernetes/pkg/kubelet/dockershim/libdocker"
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"k8s.io/kubernetes/pkg/kubelet/images"
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)
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// DockerPuller is an abstract interface for testability. It abstracts image pull operations.
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// DockerPuller is *not* in use anywhere in the codebase.
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// TODO: Examine whether we can migrate the unit tests and remove the code.
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type DockerPuller interface {
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Pull(image string, secrets []v1.Secret) error
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GetImageRef(image string) (string, error)
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}
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// dockerPuller is the default implementation of DockerPuller.
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type dockerPuller struct {
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client libdocker.Interface
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keyring credentialprovider.DockerKeyring
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}
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// newDockerPuller creates a new instance of the default implementation of DockerPuller.
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func newDockerPuller(client libdocker.Interface) DockerPuller {
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return &dockerPuller{
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client: client,
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keyring: credentialprovider.NewDockerKeyring(),
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}
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}
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func filterHTTPError(err error, image string) error {
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// docker/docker/pull/11314 prints detailed error info for docker pull.
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// When it hits 502, it returns a verbose html output including an inline svg,
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// which makes the output of kubectl get pods much harder to parse.
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// Here converts such verbose output to a concise one.
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jerr, ok := err.(*jsonmessage.JSONError)
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if ok && (jerr.Code == http.StatusBadGateway ||
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jerr.Code == http.StatusServiceUnavailable ||
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jerr.Code == http.StatusGatewayTimeout) {
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glog.V(2).Infof("Pulling image %q failed: %v", image, err)
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return images.RegistryUnavailable
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} else {
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return err
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}
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}
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func (p dockerPuller) Pull(image string, secrets []v1.Secret) error {
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keyring, err := credentialprovider.MakeDockerKeyring(secrets, p.keyring)
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if err != nil {
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return err
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}
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// The only used image pull option RegistryAuth will be set in kube_docker_client
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opts := dockertypes.ImagePullOptions{}
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creds, haveCredentials := keyring.Lookup(image)
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if !haveCredentials {
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glog.V(1).Infof("Pulling image %s without credentials", image)
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err := p.client.PullImage(image, dockertypes.AuthConfig{}, opts)
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if err == nil {
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// Sometimes PullImage failed with no error returned.
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imageRef, ierr := p.GetImageRef(image)
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if ierr != nil {
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glog.Warningf("Failed to inspect image %s: %v", image, ierr)
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}
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if imageRef == "" {
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return fmt.Errorf("image pull failed for unknown error")
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}
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return nil
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}
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// Image spec: [<registry>/]<repository>/<image>[:<version] so we count '/'
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explicitRegistry := (strings.Count(image, "/") == 2)
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// Hack, look for a private registry, and decorate the error with the lack of
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// credentials. This is heuristic, and really probably could be done better
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// by talking to the registry API directly from the kubelet here.
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if explicitRegistry {
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return fmt.Errorf("image pull failed for %s, this may be because there are no credentials on this request. details: (%v)", image, err)
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}
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return filterHTTPError(err, image)
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}
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var pullErrs []error
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for _, currentCreds := range creds {
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err = p.client.PullImage(image, credentialprovider.LazyProvide(currentCreds), opts)
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// If there was no error, return success
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if err == nil {
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return nil
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}
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pullErrs = append(pullErrs, filterHTTPError(err, image))
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}
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return utilerrors.NewAggregate(pullErrs)
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}
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func (p dockerPuller) GetImageRef(image string) (string, error) {
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resp, err := p.client.InspectImageByRef(image)
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if err == nil {
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if resp == nil {
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return "", nil
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}
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imageRef := resp.ID
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if len(resp.RepoDigests) > 0 {
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imageRef = resp.RepoDigests[0]
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}
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return imageRef, nil
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}
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if libdocker.IsImageNotFoundError(err) {
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return "", nil
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}
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return "", err
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}
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