Set user agent header (#3294)

This sets our user agent header. The API server now receives 

> pulumi-kubernetes/4.0.0-alpha.0+dev (darwin/arm64) client-go/v0.31.0

Fixes #3267.

CHANGELOG.md

@@ -6,6 +6,10 @@
   `before-first-apply` conflict when Pulumi performs a server-side apply for
   the first time. (https://github.com/pulumi/pulumi-kubernetes/pull/3275)
 
+- The provider's user agent is now set correctly when communicating with
+  the Kubernetes API server.
+  (https://github.com/pulumi/pulumi-kubernetes/issues/3267)
+
 ## 4.18.2 (October 16, 2024)
 
 ### Fixed

provider/pkg/provider/provider.go

@@ -48,6 +48,7 @@ import (
 	"github.com/pulumi/pulumi-kubernetes/provider/v4/pkg/openapi"
 	providerresource "github.com/pulumi/pulumi-kubernetes/provider/v4/pkg/provider/resource"
 	"github.com/pulumi/pulumi-kubernetes/provider/v4/pkg/ssa"
+	"github.com/pulumi/pulumi-kubernetes/provider/v4/pkg/version"
 	pulumischema "github.com/pulumi/pulumi/pkg/v3/codegen/schema"
 	"github.com/pulumi/pulumi/pkg/v3/resource/deploy/providers"
 	"github.com/pulumi/pulumi/pkg/v3/resource/provider"
@@ -852,6 +853,7 @@ func (k *kubeProvider) Configure(_ context.Context, req *pulumirpc.ConfigureRequ
 				logger.V(9).Infof("kube client timeout set to %v", config.Timeout)
 			}
 			config.WarningHandler = rest.NoWarnings{}
+			config.UserAgent = version.UserAgent
 		}
 	}
 

provider/pkg/version/version.go

@@ -14,5 +14,39 @@
 
 package version
 
+import (
+	"fmt"
+	"runtime"
+	"runtime/debug"
+)
+
 // Version is initialized by the Go linker to contain the semver of this build.
 var Version string
+
+// UserAgent is how the provider identifies itself to the API server.
+var UserAgent string
+
+func init() {
+	bi, ok := debug.ReadBuildInfo()
+	if !ok {
+		panic("unable to read build info")
+	}
+	clientGoVersion := "unknown"
+	for _, dep := range bi.Deps {
+		if dep.Path != "k8s.io/client-go" {
+			continue
+		}
+		clientGoVersion = dep.Version
+	}
+	version := "dev"
+	if Version != "" {
+		version = Version
+	}
+	UserAgent = fmt.Sprintf("%s/%s (%s/%s) client-go/%s",
+		"pulumi-kubernetes",
+		version,
+		runtime.GOOS,
+		runtime.GOARCH,
+		clientGoVersion,
+	)
+}

provider/pkg/version/version_test.go

@@ -0,0 +1,11 @@
+package version
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestUserAgent(t *testing.T) {
+	assert.Regexp(t, "^pulumi-kubernetes/dev (.*/.*) client-go/unknown$", UserAgent)
+}