cmd/buildx: non-functional k8s.io/client-go/plugin/pkg/client/auth/openstack

Kubernetes v1.26 removed the in-tree openstack cloud provider. While buildx
has a replace rule to pin the k8s dependencies to an older version, such
replace rules are non-transitive, which means that consumers of buildx as
a module could potentially end up with non-resolvable dependencies.

The used code was already non-functional since c41b006be1
(buildx v0.5.0-rc1);

a6b0959276/vendor/k8s.io/client-go/plugin/pkg/client/auth/openstack/openstack_stub.go (L26-L36)

See:

- 9bbf01bae9
- 98e81a7784

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

cmd/buildx/main.go

@@ -21,7 +21,6 @@ import (
 	_ "k8s.io/client-go/plugin/pkg/client/auth/azure"
 	_ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
 	_ "k8s.io/client-go/plugin/pkg/client/auth/oidc"
-	_ "k8s.io/client-go/plugin/pkg/client/auth/openstack"
 
 	_ "github.com/docker/buildx/driver/docker"
 	_ "github.com/docker/buildx/driver/docker-container"

vendor/k8s.io/client-go/plugin/pkg/client/auth/openstack/openstack_stub.go

@@ -1,36 +0,0 @@
-/*
-Copyright 2020 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 openstack
-
-import (
-	"errors"
-
-	"k8s.io/client-go/rest"
-	"k8s.io/klog/v2"
-)
-
-func init() {
-	if err := rest.RegisterAuthProviderPlugin("openstack", newOpenstackAuthProvider); err != nil {
-		klog.Fatalf("Failed to register openstack auth plugin: %s", err)
-	}
-}
-
-func newOpenstackAuthProvider(_ string, _ map[string]string, _ rest.AuthProviderConfigPersister) (rest.AuthProvider, error) {
-	return nil, errors.New(`The openstack auth plugin has been removed.
-Please use the "client-keystone-auth" kubectl/client-go credential plugin instead.
-See https://github.com/kubernetes/cloud-provider-openstack/blob/master/docs/using-client-keystone-auth.md for further details`)
-}

vendor/modules.txt

@@ -1214,7 +1214,6 @@ k8s.io/client-go/plugin/pkg/client/auth/azure
 k8s.io/client-go/plugin/pkg/client/auth/exec
 k8s.io/client-go/plugin/pkg/client/auth/gcp
 k8s.io/client-go/plugin/pkg/client/auth/oidc
-k8s.io/client-go/plugin/pkg/client/auth/openstack
 k8s.io/client-go/rest
 k8s.io/client-go/rest/watch
 k8s.io/client-go/third_party/forked/golang/template