Update k8s client-go to v6.0.0 (#1340)

* Update k8s client-go to v6.0.0

This fix updates k8s client-go to v6.0.0 as CoreDNS is supported
in 1.9 and v6.0.0 is the recommended version.

There are quite some massive changes that need to be made:
1. k8s.io/client-go/pkg/api/v1 has been changed to k8s.io/api/v1 (repo changed from `client-go` to `api`)
2. kubernetes.Clientset adds one extra layer, so that `kubernetes.Clientset.Services()` and like has been changed to `kubernetes.Clientset.CoreV1().Services()`

Also, we have to stick with specific commits of `k8s.io/apimachinery` and the newly introduced `k8s.io/api`
because go dep still could not figure out the right version to fetch.

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Update vendor with `dep ensure --update` and `dep prune`

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

1 files changed, 16 insertions, 9 deletions

diff --git a/vendor/github.com/go-openapi/spec/expander.go b/vendor/github.com/go-openapi/spec/expander.go
index 140daf6e8..59a227059 100644
--- a/vendor/github.com/go-openapi/spec/expander.go
+++ b/vendor/github.com/go-openapi/spec/expander.go
@@ -91,7 +91,7 @@ func ResolveRefWithBase(root interface{}, ref *Ref, opts *ExpandOptions) (*Schem
 		return nil, err
 	}
 	specBasePath := ""
-	if opts != nil {
+	if opts != nil && opts.RelativeBase != "" {
 		specBasePath, _ = absPath(opts.RelativeBase)
 	}
 
@@ -466,7 +466,7 @@ func ExpandSpec(spec *Swagger, options *ExpandOptions) error {
 
 	// getting the base path of the spec to adjust all subsequent reference resolutions
 	specBasePath := ""
-	if options != nil {
+	if options != nil && options.RelativeBase != "" {
 		specBasePath, _ = absPath(options.RelativeBase)
 	}
 
@@ -535,6 +535,7 @@ func ExpandSchema(schema *Schema, root interface{}, cache ResolutionCache) error
 	if err != nil {
 		return err
 	}
+	defer os.Remove(file.Name())
 
 	switch r := root.(type) {
 	case *Schema:
@@ -561,8 +562,12 @@ func ExpandSchemaWithBasePath(schema *Schema, cache ResolutionCache, opts *Expan
 	}
 
 	if opts == nil {
-		return errors.New("cannot expand schema without a basPath")
+		return errors.New("cannot expand schema without a base path")
 	}
+	if opts.RelativeBase == "" {
+		return errors.New("cannot expand schema with empty base path")
+	}
+
 	basePath, _ := absPath(opts.RelativeBase)
 
 	resolver, err := defaultSchemaLoader(nil, opts, cache)
@@ -647,14 +652,16 @@ func expandSchema(target Schema, parentRefs []string, resolver *schemaLoader, ba
 	/* Ref also changes the resolution scope of children expandSchema */
 	if target.Ref.String() != "" {
 		/* Here the resolution scope is changed because a $ref was encountered */
-		newRef := normalizeFileRef(&target.Ref, basePath)
-		newBasePath := newRef.RemoteURI()
+		normalizedRef := normalizeFileRef(&target.Ref, basePath)
+		normalizedBasePath := normalizedRef.RemoteURI()
+
 		/* this means there is a circle in the recursion tree */
 		/* return the Ref */
-		if swag.ContainsStringsCI(parentRefs, newRef.String()) {
-			target.Ref = *newRef
+		if basePath != "" && swag.ContainsStringsCI(parentRefs, normalizedRef.String()) {
+			target.Ref = *normalizedRef
 			return &target, nil
 		}
+
 		debugLog("\nbasePath: %s", basePath)
 		b, _ := json.Marshal(target)
 		debugLog("calling Resolve with target: %s", string(b))
@@ -663,8 +670,8 @@ func expandSchema(target Schema, parentRefs []string, resolver *schemaLoader, ba
 		}
 
 		if t != nil {
-			parentRefs = append(parentRefs, newRef.String())
-			return expandSchema(*t, parentRefs, resolver, newBasePath)
+			parentRefs = append(parentRefs, normalizedRef.String())
+			return expandSchema(*t, parentRefs, resolver, normalizedBasePath)
 		}
 	}