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kubelet/rkt: Add PullImage()/IsImagePresent() to rkt runtime.
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Yifan Gu
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Apr 30, 2015
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/* | ||
Copyright 2015 Google Inc. All rights reserved. | ||
Licensed under the Apache License, Version 2.0 (the "License"); | ||
you may not use this file except in compliance with the License. | ||
You may obtain a copy of the License at | ||
http://www.apache.org/licenses/LICENSE-2.0 | ||
Unless required by applicable law or agreed to in writing, software | ||
distributed under the License is distributed on an "AS IS" BASIS, | ||
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
See the License for the specific language governing permissions and | ||
limitations under the License. | ||
*/ | ||
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package rkt | ||
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import ( | ||
"fmt" | ||
"os" | ||
"path" | ||
"strings" | ||
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"github.com/docker/docker/pkg/parsers" | ||
docker "github.com/fsouza/go-dockerclient" | ||
"github.com/golang/glog" | ||
) | ||
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const ( | ||
authDir = "auth.d" | ||
dockerAuthTemplate = `{"rktKind":"dockerAuth","rktVersion":"v1","registries":[%q],"credentials":{"user":%q,"password":%q}}` | ||
) | ||
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// writeDockerAuthConfig writes the docker credentials to rkt auth config files. | ||
// This enables rkt to pull docker images from docker registry with credentials. | ||
func (r *Runtime) writeDockerAuthConfig(image string, creds docker.AuthConfiguration) error { | ||
registry := "index.docker.io" | ||
// Image spec: [<registry>/]<repository>/<image>[:<version] | ||
explicitRegistry := (strings.Count(image, "/") == 2) | ||
if explicitRegistry { | ||
registry = strings.Split(image, "/")[0] | ||
} | ||
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localConfigDir := rktLocalConfigDir | ||
if r.config.LocalConfigDir != "" { | ||
localConfigDir = r.config.LocalConfigDir | ||
} | ||
authDir := path.Join(localConfigDir, "auth.d") | ||
if _, err := os.Stat(authDir); os.IsNotExist(err) { | ||
if err := os.Mkdir(authDir, 0600); err != nil { | ||
glog.Errorf("rkt: Cannot create auth dir: %v", err) | ||
return err | ||
} | ||
} | ||
f, err := os.Create(path.Join(localConfigDir, authDir, registry+".json")) | ||
if err != nil { | ||
glog.Errorf("rkt: Cannot create docker auth config file: %v", err) | ||
return err | ||
} | ||
defer f.Close() | ||
config := fmt.Sprintf(dockerAuthTemplate, registry, creds.Username, creds.Password) | ||
if _, err := f.Write([]byte(config)); err != nil { | ||
glog.Errorf("rkt: Cannot write docker auth config file: %v", err) | ||
return err | ||
} | ||
return nil | ||
} | ||
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// PullImage invokes 'rkt fetch' to download an aci. | ||
func (r *Runtime) PullImage(img string) error { | ||
// Use credentials for docker images. This string operation can be cleaned up | ||
// once the format of image is landed, see: | ||
// https://github.com/GoogleCloudPlatform/kubernetes/issues/7203 | ||
// | ||
if strings.HasPrefix(img, dockerPrefix) { | ||
repoToPull, tag := parsers.ParseRepositoryTag(img) | ||
// If no tag was specified, use the default "latest". | ||
if len(tag) == 0 { | ||
tag = "latest" | ||
} | ||
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creds, ok := r.dockerKeyring.Lookup(repoToPull) | ||
if !ok { | ||
glog.V(1).Infof("Pulling image %s without credentials", img) | ||
} | ||
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// Let's update a json. | ||
// TODO(yifan): Find a way to feed this to rkt. | ||
if err := r.writeDockerAuthConfig(img, creds); err != nil { | ||
return err | ||
} | ||
} | ||
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output, err := r.runCommand("fetch", img) | ||
if err != nil { | ||
return fmt.Errorf("rkt: Failed to fetch image: %v:", output) | ||
} | ||
return nil | ||
} | ||
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// IsImagePresent returns true if the image is available on the machine. | ||
// TODO(yifan): 'rkt image' is now landed on master, use that once we bump up | ||
// the rkt version. | ||
func (r *Runtime) IsImagePresent(img string) (bool, error) { | ||
if _, err := r.runCommand("prepare", "--local=true", img); err != nil { | ||
return false, nil | ||
} | ||
return true, nil | ||
} |
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