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allow any number of kubeconfig files

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This commit is contained in:
deads2k
2015-03-17 08:21:10 -04:00
parent 9df2ea4aef
commit 8555ed3ede
5 changed files with 48 additions and 50 deletions
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49
pkg/client/clientcmd/loader.go
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@@ -33,31 +33,35 @@ import (
const (
RecommendedConfigPathFlag = "kubeconfig"
RecommendedConfigPathEnvVar = "KUBECONFIG"
DefaultEnvVarIndex = 0
DefaultCurrentDirIndex = 1
DefaultHomeDirIndex = 2
)
// ClientConfigLoadingRules is a struct that calls our specific locations that are used for merging together a Config
// 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:
// [0] = EnvVarPath
// [1] = CurrentDirectoryPath
// [2] = HomeDirectoryPath
// ExplicitPath is special, because if a user specifically requests a certain file be used and error is reported if thie file is not present
type ClientConfigLoadingRules struct {
CommandLinePath string
EnvVarPath string
CurrentDirectoryPath string
HomeDirectoryPath string
ExplicitPath string
Precedence []string
}
// NewClientConfigLoadingRules returns a ClientConfigLoadingRules object with default fields filled in. You are not required to
// NewDefaultClientConfigLoadingRules returns a ClientConfigLoadingRules object with default fields filled in. You are not required to
// use this constructor
func NewClientConfigLoadingRules() *ClientConfigLoadingRules {
func NewDefaultClientConfigLoadingRules() *ClientConfigLoadingRules {
return &ClientConfigLoadingRules{
CurrentDirectoryPath: ".kubeconfig",
HomeDirectoryPath: os.Getenv("HOME") + "/.kube/.kubeconfig",
Precedence: []string{os.Getenv(RecommendedConfigPathEnvVar), ".kubeconfig", os.Getenv("HOME") + "/.kube/.kubeconfig"},
}
}
// Load takes the loading rules and merges together a Config object based on following order.
// 1. CommandLinePath
// 2. EnvVarPath
// 3. CurrentDirectoryPath
// 4. HomeDirectoryPath
// A missing CommandLinePath file produces an error. Empty filenames or other missing files are ignored.
// 1. ExplicitPath
// 2. 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.
@@ -71,13 +75,14 @@ func (rules *ClientConfigLoadingRules) Load() (*clientcmdapi.Config, error) {
errlist := []error{}
// Make sure a file we were explicitly told to use exists
if len(rules.CommandLinePath) > 0 {
if _, err := os.Stat(rules.CommandLinePath); os.IsNotExist(err) {
errlist = append(errlist, fmt.Errorf("The config file %v does not exist", rules.CommandLinePath))
if len(rules.ExplicitPath) > 0 {
if _, err := os.Stat(rules.ExplicitPath); os.IsNotExist(err) {
errlist = append(errlist, fmt.Errorf("The config file %v does not exist", rules.ExplicitPath))
}
}
kubeConfigFiles := []string{rules.CommandLinePath, rules.EnvVarPath, rules.CurrentDirectoryPath, rules.HomeDirectoryPath}
kubeConfigFiles := []string{rules.ExplicitPath}
kubeConfigFiles = append(kubeConfigFiles, rules.Precedence...)
// first merge all of our maps
mapConfig := clientcmdapi.NewConfig()
@@ -85,7 +90,7 @@ func (rules *ClientConfigLoadingRules) Load() (*clientcmdapi.Config, error) {
if err := mergeConfigWithFile(mapConfig, file); err != nil {
errlist = append(errlist, err)
}
if err := resolveLocalPaths(file, mapConfig); err != nil {
if err := ResolveLocalPaths(file, mapConfig); err != nil {
errlist = append(errlist, err)
}
}
@@ -96,7 +101,7 @@ func (rules *ClientConfigLoadingRules) Load() (*clientcmdapi.Config, error) {
for i := len(kubeConfigFiles) - 1; i >= 0; i-- {
file := kubeConfigFiles[i]
mergeConfigWithFile(nonMapConfig, file)
resolveLocalPaths(file, nonMapConfig)
ResolveLocalPaths(file, nonMapConfig)
}
// since values are overwritten, but maps values are not, we can merge the non-map config on top of the map config and
@@ -127,10 +132,10 @@ func mergeConfigWithFile(startingConfig *clientcmdapi.Config, filename string) e
return nil
}
// resolveLocalPaths resolves all relative paths in the config object with respect to the parent directory of the filename
// ResolveLocalPaths resolves all relative paths in the config object with respect to the parent directory of the filename
// 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(filename string, config *clientcmdapi.Config) error {
func ResolveLocalPaths(filename string, config *clientcmdapi.Config) error {
if len(filename) == 0 {
return nil
}