Add operator version

Author: lucacome

Dockerfile

@@ -1,5 +1,6 @@
 # Build the manager binary
 FROM golang:1.16 as builder
+ARG VERSION
 
 WORKDIR /workspace
 # Copy the Go Modules manifests
@@ -15,7 +16,7 @@ COPY api/ api/
 COPY controllers/ controllers/
 
 # Build
-RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -a -o manager main.go
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags "-s -w -X main.version=${VERSION}" -a -o manager main.go
 
 # Use distroless as minimal base image to package the manager binary
 # Refer to https://github.com/GoogleContainerTools/distroless for more details

Makefile

@@ -94,13 +94,13 @@ test: manifests generate fmt vet ## Run tests.
 ##@ Build
 
 build: generate fmt vet ## Build manager binary.
-	go build -o bin/manager main.go
+	go build -ldflags "-X main.version=${VERSION}" -o bin/manager main.go
 
 run: manifests generate fmt vet ## Run a controller from your host.
-	go run ./main.go $(ARGS)
+	go run -ldflags "-X main.version=${VERSION}" ./main.go $(ARGS)
 
 docker-build: test ## Build docker image with the manager.
-	docker build -t ${IMG} .
+	docker build -t ${IMG} . --build-arg VERSION=${VERSION}
 
 docker-push: ## Push docker image with the manager.
 	docker push ${IMG}

main.go

@@ -45,10 +45,11 @@ import (
 var (
 	scheme   = runtime.NewScheme()
 	setupLog = ctrl.Log.WithName("setup")
+	version  string
 )
 
 func printVersion() {
-	// log.Info(fmt.Sprintf("Operator Version: %s", version.Version))
+	setupLog.Info(fmt.Sprintf("Operator Version: %s", version))
 	setupLog.Info(fmt.Sprintf("Go Version: %s", runt.Version()))
 	setupLog.Info(fmt.Sprintf("Go OS/Arch: %s/%s", runt.GOOS, runt.GOARCH))
 	setupLog.Info(fmt.Sprintf("Version of kubernetes: %v", controllers.RunningK8sVersion))