Import of https://github.com/ciena/voltctl at commit 40d61fbf3f910ed4017cf67c9c79e8e1f82a33a5
Change-Id: I8464c59e60d76cb8612891db3303878975b5416c
diff --git a/vendor/k8s.io/client-go/tools/clientcmd/loader.go b/vendor/k8s.io/client-go/tools/clientcmd/loader.go
new file mode 100644
index 0000000..7e928a9
--- /dev/null
+++ b/vendor/k8s.io/client-go/tools/clientcmd/loader.go
@@ -0,0 +1,633 @@
+/*
+Copyright 2014 The Kubernetes Authors.
+
+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.
+*/
+
+package clientcmd
+
+import (
+ "fmt"
+ "io"
+ "io/ioutil"
+ "os"
+ "path"
+ "path/filepath"
+ "reflect"
+ goruntime "runtime"
+ "strings"
+
+ "github.com/imdario/mergo"
+ "k8s.io/klog"
+
+ "k8s.io/apimachinery/pkg/runtime"
+ "k8s.io/apimachinery/pkg/runtime/schema"
+ utilerrors "k8s.io/apimachinery/pkg/util/errors"
+ restclient "k8s.io/client-go/rest"
+ clientcmdapi "k8s.io/client-go/tools/clientcmd/api"
+ clientcmdlatest "k8s.io/client-go/tools/clientcmd/api/latest"
+ "k8s.io/client-go/util/homedir"
+)
+
+const (
+ RecommendedConfigPathFlag = "kubeconfig"
+ RecommendedConfigPathEnvVar = "KUBECONFIG"
+ RecommendedHomeDir = ".kube"
+ RecommendedFileName = "config"
+ RecommendedSchemaName = "schema"
+)
+
+var (
+ RecommendedConfigDir = path.Join(homedir.HomeDir(), RecommendedHomeDir)
+ RecommendedHomeFile = path.Join(RecommendedConfigDir, RecommendedFileName)
+ RecommendedSchemaFile = path.Join(RecommendedConfigDir, RecommendedSchemaName)
+)
+
+// currentMigrationRules returns a map that holds the history of recommended home directories used in previous versions.
+// Any future changes to RecommendedHomeFile and related are expected to add a migration rule here, in order to make
+// sure existing config files are migrated to their new locations properly.
+func currentMigrationRules() map[string]string {
+ oldRecommendedHomeFile := path.Join(os.Getenv("HOME"), "/.kube/.kubeconfig")
+ oldRecommendedWindowsHomeFile := path.Join(os.Getenv("HOME"), RecommendedHomeDir, RecommendedFileName)
+
+ migrationRules := map[string]string{}
+ migrationRules[RecommendedHomeFile] = oldRecommendedHomeFile
+ if goruntime.GOOS == "windows" {
+ migrationRules[RecommendedHomeFile] = oldRecommendedWindowsHomeFile
+ }
+ return migrationRules
+}
+
+type ClientConfigLoader interface {
+ ConfigAccess
+ // IsDefaultConfig returns true if the returned config matches the defaults.
+ IsDefaultConfig(*restclient.Config) bool
+ // Load returns the latest config
+ Load() (*clientcmdapi.Config, error)
+}
+
+type KubeconfigGetter func() (*clientcmdapi.Config, error)
+
+type ClientConfigGetter struct {
+ kubeconfigGetter KubeconfigGetter
+}
+
+// ClientConfigGetter implements the ClientConfigLoader interface.
+var _ ClientConfigLoader = &ClientConfigGetter{}
+
+func (g *ClientConfigGetter) Load() (*clientcmdapi.Config, error) {
+ return g.kubeconfigGetter()
+}
+
+func (g *ClientConfigGetter) GetLoadingPrecedence() []string {
+ return nil
+}
+func (g *ClientConfigGetter) GetStartingConfig() (*clientcmdapi.Config, error) {
+ return g.kubeconfigGetter()
+}
+func (g *ClientConfigGetter) GetDefaultFilename() string {
+ return ""
+}
+func (g *ClientConfigGetter) IsExplicitFile() bool {
+ return false
+}
+func (g *ClientConfigGetter) GetExplicitFile() string {
+ return ""
+}
+func (g *ClientConfigGetter) IsDefaultConfig(config *restclient.Config) bool {
+ return false
+}
+
+// ClientConfigLoadingRules is an ExplicitPath and string slice of specific locations that are used for merging together a Config
+// Callers can put the chain together however they want, but we'd recommend:
+// EnvVarPathFiles if set (a list of files if set) OR the HomeDirectoryPath
+// ExplicitPath is special, because if a user specifically requests a certain file be used and error is reported if this file is not present
+type ClientConfigLoadingRules struct {
+ ExplicitPath string
+ Precedence []string
+
+ // MigrationRules is a map of destination files to source files. If a destination file is not present, then the source file is checked.
+ // If the source file is present, then it is copied to the destination file BEFORE any further loading happens.
+ MigrationRules map[string]string
+
+ // DoNotResolvePaths indicates whether or not to resolve paths with respect to the originating files. This is phrased as a negative so
+ // that a default object that doesn't set this will usually get the behavior it wants.
+ DoNotResolvePaths bool
+
+ // DefaultClientConfig is an optional field indicating what rules to use to calculate a default configuration.
+ // This should match the overrides passed in to ClientConfig loader.
+ DefaultClientConfig ClientConfig
+}
+
+// ClientConfigLoadingRules implements the ClientConfigLoader interface.
+var _ ClientConfigLoader = &ClientConfigLoadingRules{}
+
+// NewDefaultClientConfigLoadingRules returns a ClientConfigLoadingRules object with default fields filled in. You are not required to
+// use this constructor
+func NewDefaultClientConfigLoadingRules() *ClientConfigLoadingRules {
+ chain := []string{}
+
+ envVarFiles := os.Getenv(RecommendedConfigPathEnvVar)
+ if len(envVarFiles) != 0 {
+ fileList := filepath.SplitList(envVarFiles)
+ // prevent the same path load multiple times
+ chain = append(chain, deduplicate(fileList)...)
+
+ } else {
+ chain = append(chain, RecommendedHomeFile)
+ }
+
+ return &ClientConfigLoadingRules{
+ Precedence: chain,
+ MigrationRules: currentMigrationRules(),
+ }
+}
+
+// Load starts by running the MigrationRules and then
+// takes the loading rules and returns a Config object based on following rules.
+// if the ExplicitPath, return the unmerged explicit file
+// Otherwise, return a merged config based on the Precedence slice
+// A missing ExplicitPath file produces an error. Empty filenames or other missing files are ignored.
+// Read errors or files with non-deserializable content produce errors.
+// The first file to set a particular map key wins and map key's value is never changed.
+// BUT, if you set a struct value that is NOT contained inside of map, the value WILL be changed.
+// This results in some odd looking logic to merge in one direction, merge in the other, and then merge the two.
+// It also means that if two files specify a "red-user", only values from the first file's red-user are used. Even
+// non-conflicting entries from the second file's "red-user" are discarded.
+// Relative paths inside of the .kubeconfig files are resolved against the .kubeconfig file's parent folder
+// and only absolute file paths are returned.
+func (rules *ClientConfigLoadingRules) Load() (*clientcmdapi.Config, error) {
+ if err := rules.Migrate(); err != nil {
+ return nil, err
+ }
+
+ errlist := []error{}
+
+ kubeConfigFiles := []string{}
+
+ // Make sure a file we were explicitly told to use exists
+ if len(rules.ExplicitPath) > 0 {
+ if _, err := os.Stat(rules.ExplicitPath); os.IsNotExist(err) {
+ return nil, err
+ }
+ kubeConfigFiles = append(kubeConfigFiles, rules.ExplicitPath)
+
+ } else {
+ kubeConfigFiles = append(kubeConfigFiles, rules.Precedence...)
+ }
+
+ kubeconfigs := []*clientcmdapi.Config{}
+ // read and cache the config files so that we only look at them once
+ for _, filename := range kubeConfigFiles {
+ if len(filename) == 0 {
+ // no work to do
+ continue
+ }
+
+ config, err := LoadFromFile(filename)
+ if os.IsNotExist(err) {
+ // skip missing files
+ continue
+ }
+ if err != nil {
+ errlist = append(errlist, fmt.Errorf("Error loading config file \"%s\": %v", filename, err))
+ continue
+ }
+
+ kubeconfigs = append(kubeconfigs, config)
+ }
+
+ // first merge all of our maps
+ mapConfig := clientcmdapi.NewConfig()
+
+ for _, kubeconfig := range kubeconfigs {
+ mergo.MergeWithOverwrite(mapConfig, kubeconfig)
+ }
+
+ // merge all of the struct values in the reverse order so that priority is given correctly
+ // errors are not added to the list the second time
+ nonMapConfig := clientcmdapi.NewConfig()
+ for i := len(kubeconfigs) - 1; i >= 0; i-- {
+ kubeconfig := kubeconfigs[i]
+ mergo.MergeWithOverwrite(nonMapConfig, kubeconfig)
+ }
+
+ // since values are overwritten, but maps values are not, we can merge the non-map config on top of the map config and
+ // get the values we expect.
+ config := clientcmdapi.NewConfig()
+ mergo.MergeWithOverwrite(config, mapConfig)
+ mergo.MergeWithOverwrite(config, nonMapConfig)
+
+ if rules.ResolvePaths() {
+ if err := ResolveLocalPaths(config); err != nil {
+ errlist = append(errlist, err)
+ }
+ }
+ return config, utilerrors.NewAggregate(errlist)
+}
+
+// Migrate uses the MigrationRules map. If a destination file is not present, then the source file is checked.
+// If the source file is present, then it is copied to the destination file BEFORE any further loading happens.
+func (rules *ClientConfigLoadingRules) Migrate() error {
+ if rules.MigrationRules == nil {
+ return nil
+ }
+
+ for destination, source := range rules.MigrationRules {
+ if _, err := os.Stat(destination); err == nil {
+ // if the destination already exists, do nothing
+ continue
+ } else if os.IsPermission(err) {
+ // if we can't access the file, skip it
+ continue
+ } else if !os.IsNotExist(err) {
+ // if we had an error other than non-existence, fail
+ return err
+ }
+
+ if sourceInfo, err := os.Stat(source); err != nil {
+ if os.IsNotExist(err) || os.IsPermission(err) {
+ // if the source file doesn't exist or we can't access it, there's no work to do.
+ continue
+ }
+
+ // if we had an error other than non-existence, fail
+ return err
+ } else if sourceInfo.IsDir() {
+ return fmt.Errorf("cannot migrate %v to %v because it is a directory", source, destination)
+ }
+
+ in, err := os.Open(source)
+ if err != nil {
+ return err
+ }
+ defer in.Close()
+ out, err := os.Create(destination)
+ if err != nil {
+ return err
+ }
+ defer out.Close()
+
+ if _, err = io.Copy(out, in); err != nil {
+ return err
+ }
+ }
+
+ return nil
+}
+
+// GetLoadingPrecedence implements ConfigAccess
+func (rules *ClientConfigLoadingRules) GetLoadingPrecedence() []string {
+ return rules.Precedence
+}
+
+// GetStartingConfig implements ConfigAccess
+func (rules *ClientConfigLoadingRules) GetStartingConfig() (*clientcmdapi.Config, error) {
+ clientConfig := NewNonInteractiveDeferredLoadingClientConfig(rules, &ConfigOverrides{})
+ rawConfig, err := clientConfig.RawConfig()
+ if os.IsNotExist(err) {
+ return clientcmdapi.NewConfig(), nil
+ }
+ if err != nil {
+ return nil, err
+ }
+
+ return &rawConfig, nil
+}
+
+// GetDefaultFilename implements ConfigAccess
+func (rules *ClientConfigLoadingRules) GetDefaultFilename() string {
+ // Explicit file if we have one.
+ if rules.IsExplicitFile() {
+ return rules.GetExplicitFile()
+ }
+ // Otherwise, first existing file from precedence.
+ for _, filename := range rules.GetLoadingPrecedence() {
+ if _, err := os.Stat(filename); err == nil {
+ return filename
+ }
+ }
+ // If none exists, use the first from precedence.
+ if len(rules.Precedence) > 0 {
+ return rules.Precedence[0]
+ }
+ return ""
+}
+
+// IsExplicitFile implements ConfigAccess
+func (rules *ClientConfigLoadingRules) IsExplicitFile() bool {
+ return len(rules.ExplicitPath) > 0
+}
+
+// GetExplicitFile implements ConfigAccess
+func (rules *ClientConfigLoadingRules) GetExplicitFile() string {
+ return rules.ExplicitPath
+}
+
+// IsDefaultConfig returns true if the provided configuration matches the default
+func (rules *ClientConfigLoadingRules) IsDefaultConfig(config *restclient.Config) bool {
+ if rules.DefaultClientConfig == nil {
+ return false
+ }
+ defaultConfig, err := rules.DefaultClientConfig.ClientConfig()
+ if err != nil {
+ return false
+ }
+ return reflect.DeepEqual(config, defaultConfig)
+}
+
+// LoadFromFile takes a filename and deserializes the contents into Config object
+func LoadFromFile(filename string) (*clientcmdapi.Config, error) {
+ kubeconfigBytes, err := ioutil.ReadFile(filename)
+ if err != nil {
+ return nil, err
+ }
+ config, err := Load(kubeconfigBytes)
+ if err != nil {
+ return nil, err
+ }
+ klog.V(6).Infoln("Config loaded from file", filename)
+
+ // set LocationOfOrigin on every Cluster, User, and Context
+ for key, obj := range config.AuthInfos {
+ obj.LocationOfOrigin = filename
+ config.AuthInfos[key] = obj
+ }
+ for key, obj := range config.Clusters {
+ obj.LocationOfOrigin = filename
+ config.Clusters[key] = obj
+ }
+ for key, obj := range config.Contexts {
+ obj.LocationOfOrigin = filename
+ config.Contexts[key] = obj
+ }
+
+ if config.AuthInfos == nil {
+ config.AuthInfos = map[string]*clientcmdapi.AuthInfo{}
+ }
+ if config.Clusters == nil {
+ config.Clusters = map[string]*clientcmdapi.Cluster{}
+ }
+ if config.Contexts == nil {
+ config.Contexts = map[string]*clientcmdapi.Context{}
+ }
+
+ return config, nil
+}
+
+// Load takes a byte slice and deserializes the contents into Config object.
+// Encapsulates deserialization without assuming the source is a file.
+func Load(data []byte) (*clientcmdapi.Config, error) {
+ config := clientcmdapi.NewConfig()
+ // if there's no data in a file, return the default object instead of failing (DecodeInto reject empty input)
+ if len(data) == 0 {
+ return config, nil
+ }
+ decoded, _, err := clientcmdlatest.Codec.Decode(data, &schema.GroupVersionKind{Version: clientcmdlatest.Version, Kind: "Config"}, config)
+ if err != nil {
+ return nil, err
+ }
+ return decoded.(*clientcmdapi.Config), nil
+}
+
+// WriteToFile serializes the config to yaml and writes it out to a file. If not present, it creates the file with the mode 0600. If it is present
+// it stomps the contents
+func WriteToFile(config clientcmdapi.Config, filename string) error {
+ content, err := Write(config)
+ if err != nil {
+ return err
+ }
+ dir := filepath.Dir(filename)
+ if _, err := os.Stat(dir); os.IsNotExist(err) {
+ if err = os.MkdirAll(dir, 0755); err != nil {
+ return err
+ }
+ }
+
+ if err := ioutil.WriteFile(filename, content, 0600); err != nil {
+ return err
+ }
+ return nil
+}
+
+func lockFile(filename string) error {
+ // TODO: find a way to do this with actual file locks. Will
+ // probably need separate solution for windows and Linux.
+
+ // Make sure the dir exists before we try to create a lock file.
+ dir := filepath.Dir(filename)
+ if _, err := os.Stat(dir); os.IsNotExist(err) {
+ if err = os.MkdirAll(dir, 0755); err != nil {
+ return err
+ }
+ }
+ f, err := os.OpenFile(lockName(filename), os.O_CREATE|os.O_EXCL, 0)
+ if err != nil {
+ return err
+ }
+ f.Close()
+ return nil
+}
+
+func unlockFile(filename string) error {
+ return os.Remove(lockName(filename))
+}
+
+func lockName(filename string) string {
+ return filename + ".lock"
+}
+
+// Write serializes the config to yaml.
+// Encapsulates serialization without assuming the destination is a file.
+func Write(config clientcmdapi.Config) ([]byte, error) {
+ return runtime.Encode(clientcmdlatest.Codec, &config)
+}
+
+func (rules ClientConfigLoadingRules) ResolvePaths() bool {
+ return !rules.DoNotResolvePaths
+}
+
+// ResolveLocalPaths resolves all relative paths in the config object with respect to the stanza's LocationOfOrigin
+// this cannot be done directly inside of LoadFromFile because doing so there would make it impossible to load a file without
+// modification of its contents.
+func ResolveLocalPaths(config *clientcmdapi.Config) error {
+ for _, cluster := range config.Clusters {
+ if len(cluster.LocationOfOrigin) == 0 {
+ continue
+ }
+ base, err := filepath.Abs(filepath.Dir(cluster.LocationOfOrigin))
+ if err != nil {
+ return fmt.Errorf("Could not determine the absolute path of config file %s: %v", cluster.LocationOfOrigin, err)
+ }
+
+ if err := ResolvePaths(GetClusterFileReferences(cluster), base); err != nil {
+ return err
+ }
+ }
+ for _, authInfo := range config.AuthInfos {
+ if len(authInfo.LocationOfOrigin) == 0 {
+ continue
+ }
+ base, err := filepath.Abs(filepath.Dir(authInfo.LocationOfOrigin))
+ if err != nil {
+ return fmt.Errorf("Could not determine the absolute path of config file %s: %v", authInfo.LocationOfOrigin, err)
+ }
+
+ if err := ResolvePaths(GetAuthInfoFileReferences(authInfo), base); err != nil {
+ return err
+ }
+ }
+
+ return nil
+}
+
+// RelativizeClusterLocalPaths first absolutizes the paths by calling ResolveLocalPaths. This assumes that any NEW path is already
+// absolute, but any existing path will be resolved relative to LocationOfOrigin
+func RelativizeClusterLocalPaths(cluster *clientcmdapi.Cluster) error {
+ if len(cluster.LocationOfOrigin) == 0 {
+ return fmt.Errorf("no location of origin for %s", cluster.Server)
+ }
+ base, err := filepath.Abs(filepath.Dir(cluster.LocationOfOrigin))
+ if err != nil {
+ return fmt.Errorf("could not determine the absolute path of config file %s: %v", cluster.LocationOfOrigin, err)
+ }
+
+ if err := ResolvePaths(GetClusterFileReferences(cluster), base); err != nil {
+ return err
+ }
+ if err := RelativizePathWithNoBacksteps(GetClusterFileReferences(cluster), base); err != nil {
+ return err
+ }
+
+ return nil
+}
+
+// RelativizeAuthInfoLocalPaths first absolutizes the paths by calling ResolveLocalPaths. This assumes that any NEW path is already
+// absolute, but any existing path will be resolved relative to LocationOfOrigin
+func RelativizeAuthInfoLocalPaths(authInfo *clientcmdapi.AuthInfo) error {
+ if len(authInfo.LocationOfOrigin) == 0 {
+ return fmt.Errorf("no location of origin for %v", authInfo)
+ }
+ base, err := filepath.Abs(filepath.Dir(authInfo.LocationOfOrigin))
+ if err != nil {
+ return fmt.Errorf("could not determine the absolute path of config file %s: %v", authInfo.LocationOfOrigin, err)
+ }
+
+ if err := ResolvePaths(GetAuthInfoFileReferences(authInfo), base); err != nil {
+ return err
+ }
+ if err := RelativizePathWithNoBacksteps(GetAuthInfoFileReferences(authInfo), base); err != nil {
+ return err
+ }
+
+ return nil
+}
+
+func RelativizeConfigPaths(config *clientcmdapi.Config, base string) error {
+ return RelativizePathWithNoBacksteps(GetConfigFileReferences(config), base)
+}
+
+func ResolveConfigPaths(config *clientcmdapi.Config, base string) error {
+ return ResolvePaths(GetConfigFileReferences(config), base)
+}
+
+func GetConfigFileReferences(config *clientcmdapi.Config) []*string {
+ refs := []*string{}
+
+ for _, cluster := range config.Clusters {
+ refs = append(refs, GetClusterFileReferences(cluster)...)
+ }
+ for _, authInfo := range config.AuthInfos {
+ refs = append(refs, GetAuthInfoFileReferences(authInfo)...)
+ }
+
+ return refs
+}
+
+func GetClusterFileReferences(cluster *clientcmdapi.Cluster) []*string {
+ return []*string{&cluster.CertificateAuthority}
+}
+
+func GetAuthInfoFileReferences(authInfo *clientcmdapi.AuthInfo) []*string {
+ s := []*string{&authInfo.ClientCertificate, &authInfo.ClientKey, &authInfo.TokenFile}
+ // Only resolve exec command if it isn't PATH based.
+ if authInfo.Exec != nil && strings.ContainsRune(authInfo.Exec.Command, filepath.Separator) {
+ s = append(s, &authInfo.Exec.Command)
+ }
+ return s
+}
+
+// ResolvePaths updates the given refs to be absolute paths, relative to the given base directory
+func ResolvePaths(refs []*string, base string) error {
+ for _, ref := range refs {
+ // Don't resolve empty paths
+ if len(*ref) > 0 {
+ // Don't resolve absolute paths
+ if !filepath.IsAbs(*ref) {
+ *ref = filepath.Join(base, *ref)
+ }
+ }
+ }
+ return nil
+}
+
+// RelativizePathWithNoBacksteps updates the given refs to be relative paths, relative to the given base directory as long as they do not require backsteps.
+// Any path requiring a backstep is left as-is as long it is absolute. Any non-absolute path that can't be relativized produces an error
+func RelativizePathWithNoBacksteps(refs []*string, base string) error {
+ for _, ref := range refs {
+ // Don't relativize empty paths
+ if len(*ref) > 0 {
+ rel, err := MakeRelative(*ref, base)
+ if err != nil {
+ return err
+ }
+
+ // if we have a backstep, don't mess with the path
+ if strings.HasPrefix(rel, "../") {
+ if filepath.IsAbs(*ref) {
+ continue
+ }
+
+ return fmt.Errorf("%v requires backsteps and is not absolute", *ref)
+ }
+
+ *ref = rel
+ }
+ }
+ return nil
+}
+
+func MakeRelative(path, base string) (string, error) {
+ if len(path) > 0 {
+ rel, err := filepath.Rel(base, path)
+ if err != nil {
+ return path, err
+ }
+ return rel, nil
+ }
+ return path, nil
+}
+
+// deduplicate removes any duplicated values and returns a new slice, keeping the order unchanged
+func deduplicate(s []string) []string {
+ encountered := map[string]bool{}
+ ret := make([]string, 0)
+ for i := range s {
+ if encountered[s[i]] {
+ continue
+ }
+ encountered[s[i]] = true
+ ret = append(ret, s[i])
+ }
+ return ret
+}