// Provide implements DockerConfigProvider
func (g *containerRegistryProvider) Provide() credentialprovider.DockerConfig {
cfg := credentialprovider.DockerConfig{}
tokenJsonBlob, err := credentialprovider.ReadUrl(metadataToken, g.Client, metadataHeader)
if err != nil {
glog.Errorf("while reading access token endpoint: %v", err)
return cfg
}
email, err := credentialprovider.ReadUrl(metadataEmail, g.Client, metadataHeader)
if err != nil {
glog.Errorf("while reading email endpoint: %v", err)
return cfg
}
var parsedBlob tokenBlob
if err := json.Unmarshal([]byte(tokenJsonBlob), &parsedBlob); err != nil {
glog.Errorf("while parsing json blob %s: %v", tokenJsonBlob, err)
return cfg
}
entry := credentialprovider.DockerConfigEntry{
Username: "******",
Password: parsedBlob.AccessToken,
Email: string(email),
}
// Add our entry for each of the supported container registry URLs
for _, k := range containerRegistryUrls {
cfg[k] = entry
}
return cfg
}
// Provide implements DockerConfigProvider
func (g *dockerConfigUrlKeyProvider) Provide() credentialprovider.DockerConfig {
// Read the contents of the google-dockercfg-url key and load a .dockercfg from there
if url, err := credentialprovider.ReadUrl(dockerConfigUrlKey, g.Client, metadataHeader); err != nil {
glog.Errorf("while reading 'google-dockercfg-url' metadata: %v", err)
} else {
if strings.HasPrefix(string(url), "http") {
if cfg, err := credentialprovider.ReadDockerConfigFileFromUrl(string(url), g.Client, nil); err != nil {
glog.Errorf("while reading 'google-dockercfg-url'-specified url: %s, %v", string(url), err)
} else {
return cfg
}
} else {
// TODO(mattmoor): support reading alternate scheme URLs (e.g. gs:// or s3://)
glog.Errorf("Unsupported URL scheme: %s", string(url))
}
}
return credentialprovider.DockerConfig{}
}
// Enabled implements a special metadata-based check, which verifies the
// storage scope is available on the GCE VM.
func (g *containerRegistryProvider) Enabled() bool {
value, err := credentialprovider.ReadUrl(metadataScopes+"?alt=json", g.Client, metadataHeader)
if err != nil {
return false
}
var scopes []string
if err := json.Unmarshal([]byte(value), &scopes); err != nil {
return false
}
for _, v := range scopes {
// cloudPlatformScope implies storage scope.
if strings.HasPrefix(v, storageScopePrefix) || strings.HasPrefix(v, cloudPlatformScopePrefix) {
return true
}
}
glog.Warningf("Google container registry is disabled, no storage scope is available: %s", value)
return false
}
// Enabled implements DockerConfigProvider for all of the Google implementations.
func (g *metadataProvider) Enabled() bool {
_, err := credentialprovider.ReadUrl(metadataUrl, g.Client, metadataHeader)
return err == nil
}