add gRPC DriverGetInfo proto and sidecar bootstrap

Add initial gRPC DriverGetInfo() proto, and use it when bootstrapping
the sidecar.

Signed-off-by: Blaine Gardner <[email protected]>

Author: BlaineEXE

client/apis/objectstorage/v1alpha2/definitions.go

@@ -0,0 +1,26 @@
+/*
+Copyright 2025 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 v1alpha2
+
+const (
+	// RpcEndpointDefault is the default RPC endpoint unix socket location.
+	RpcEndpointDefault = "unix:///var/lib/cosi/cosi.sock"
+
+	// RpcEndpointEnvVarName is the name of the environment variable that is expected to hold the
+	// RPC endpoint unix socket location. If unspecified, RpcEndpointDefault should be used.
+	RpcEndpointEnvVarName = "COSI_ENDPOINT"
+)

go.mod

@@ -10,9 +10,12 @@ replace (
 )
 
 require (
+	github.com/stretchr/testify v1.11.1
+	google.golang.org/grpc v1.75.1
 	k8s.io/apimachinery v0.34.1
 	k8s.io/client-go v0.34.1
 	sigs.k8s.io/container-object-storage-interface/client v0.0.0-20250925174816-5fce7c365e9c
+	sigs.k8s.io/container-object-storage-interface/proto v0.0.0-00010101000000-000000000000
 	sigs.k8s.io/controller-runtime v0.22.1
 )
 
@@ -91,10 +94,10 @@ require (
 	gomodules.xyz/jsonpatch/v2 v2.5.0 // indirect
 	google.golang.org/genproto/googleapis/api v0.0.0-20250922171735-9219d122eba9 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20250922171735-9219d122eba9 // indirect
-	google.golang.org/grpc v1.75.1 // indirect
 	google.golang.org/protobuf v1.36.9 // indirect
 	gopkg.in/evanphx/json-patch.v4 v4.13.0 // indirect
 	gopkg.in/inf.v0 v0.9.1 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 	k8s.io/api v0.34.1 // indirect
 	k8s.io/apiextensions-apiserver v0.34.1 // indirect
 	k8s.io/apiserver v0.34.1 // indirect