refact(deps): bump k8s and client-go deps to version v0.20.2 (#294)

Signed-off-by: prateekpandey14 <prateek.pandey@mayadata.io>

vendor/k8s.io/client-go/tools/clientcmd/loader.go

@@ -28,7 +28,7 @@ import (
 	"strings"
 
 	"github.com/imdario/mergo"
-	"k8s.io/klog"
+	"k8s.io/klog/v2"
 
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/runtime/schema"
@@ -127,6 +127,10 @@ type ClientConfigLoadingRules struct {
 	// 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
+
+	// WarnIfAllMissing indicates whether the configuration files pointed by KUBECONFIG environment variable are present or not.
+	// In case of missing files, it warns the user about the missing files.
+	WarnIfAllMissing bool
 }
 
 // ClientConfigLoadingRules implements the ClientConfigLoader interface.
@@ -136,20 +140,23 @@ var _ ClientConfigLoader = &ClientConfigLoadingRules{}
 // use this constructor
 func NewDefaultClientConfigLoadingRules() *ClientConfigLoadingRules {
 	chain := []string{}
+	warnIfAllMissing := false
 
 	envVarFiles := os.Getenv(RecommendedConfigPathEnvVar)
 	if len(envVarFiles) != 0 {
 		fileList := filepath.SplitList(envVarFiles)
 		// prevent the same path load multiple times
 		chain = append(chain, deduplicate(fileList)...)
+		warnIfAllMissing = true
 
 	} else {
 		chain = append(chain, RecommendedHomeFile)
 	}
 
 	return &ClientConfigLoadingRules{
-		Precedence:     chain,
-		MigrationRules: currentMigrationRules(),
+		Precedence:       chain,
+		MigrationRules:   currentMigrationRules(),
+		WarnIfAllMissing: warnIfAllMissing,
 	}
 }
 
@@ -172,6 +179,7 @@ func (rules *ClientConfigLoadingRules) Load() (*clientcmdapi.Config, error) {
 	}
 
 	errlist := []error{}
+	missingList := []string{}
 
 	kubeConfigFiles := []string{}
 
@@ -195,18 +203,26 @@ func (rules *ClientConfigLoadingRules) Load() (*clientcmdapi.Config, error) {
 		}
 
 		config, err := LoadFromFile(filename)
+
 		if os.IsNotExist(err) {
 			// skip missing files
+			// Add to the missing list to produce a warning
+			missingList = append(missingList, filename)
 			continue
 		}
+
 		if err != nil {
-			errlist = append(errlist, fmt.Errorf("Error loading config file \"%s\": %v", filename, err))
+			errlist = append(errlist, fmt.Errorf("error loading config file \"%s\": %v", filename, err))
 			continue
 		}
 
 		kubeconfigs = append(kubeconfigs, config)
 	}
 
+	if rules.WarnIfAllMissing && len(missingList) > 0 && len(kubeconfigs) == 0 {
+		klog.Warningf("Config not found: %s", strings.Join(missingList, ", "))
+	}
+
 	// first merge all of our maps
 	mapConfig := clientcmdapi.NewConfig()
 
@@ -288,6 +304,10 @@ func (rules *ClientConfigLoadingRules) Migrate() error {
 
 // GetLoadingPrecedence implements ConfigAccess
 func (rules *ClientConfigLoadingRules) GetLoadingPrecedence() []string {
+	if len(rules.ExplicitPath) > 0 {
+		return []string{rules.ExplicitPath}
+	}
+
 	return rules.Precedence
 }
 
@@ -467,7 +487,7 @@ func ResolveLocalPaths(config *clientcmdapi.Config) error {
 		}
 		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)
+			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 {
@@ -480,7 +500,7 @@ func ResolveLocalPaths(config *clientcmdapi.Config) error {
 		}
 		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)
+			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 {