new(version): add new version flag

Makefile

@@ -11,6 +11,12 @@ else
 GOBIN=$(shell go env GOBIN)
 endif
 
+# version settings
+RELEASE?=$(shell git rev-parse HEAD)
+COMMIT?=$(shell git rev-parse HEAD)
+BUILD_DATE?=$(shell date -u +'%Y-%m-%dT%H:%M:%SZ')
+PROJECT?=github.com/falcosecurity/k8s-metacollector
+
 # Setting SHELL to bash allows bash commands to be executed by recipes.
 # Options are set to exit when a recipe line exits non-zero or a piped command fails.
 SHELL = /usr/bin/env bash -o pipefail
@@ -58,7 +64,11 @@ test: manifests generate fmt vet envtest ## Run tests.
 
 .PHONY: build
 build: manifests generate fmt vet ## Build manager binary.
-	go build -o bin/manager main.go
+	go build -ldflags \
+    "-X '${PROJECT}/pkg/version.semVersion=${RELEASE}' \
+    -X '${PROJECT}/pkg/version.gitCommit=${COMMIT}' \
+    -X '${PROJECT}/pkg/version.buildDate=${BUILD_DATE}'" \
+    -o manager .
 
 .PHONY: run
 run: manifests generate fmt vet ## Run a controller from your host.

main.go

@@ -18,13 +18,15 @@ package main
 import (
 	"context"
 	"flag"
+	"fmt"
 	"os"
 
 	"github.com/falcosecurity/k8s-metacollector/broker"
 	"github.com/falcosecurity/k8s-metacollector/collectors"
 	"github.com/falcosecurity/k8s-metacollector/pkg/events"
 	"github.com/falcosecurity/k8s-metacollector/pkg/resource"
 	"github.com/falcosecurity/k8s-metacollector/pkg/subscriber"
+	"github.com/falcosecurity/k8s-metacollector/pkg/version"
 	v1 "k8s.io/api/apps/v1"
 	corev1 "k8s.io/api/core/v1"
 	discoveryv1 "k8s.io/api/discovery/v1"
@@ -59,19 +61,26 @@ func main() {
 	var brokerAddr string
 	var certFilePath string
 	var keyFilePath string
+	var versionFlag bool
 
 	flag.StringVar(&metricsAddr, "metrics-bind-address", ":8080", "The address the metric endpoint binds to.")
 	flag.StringVar(&probeAddr, "health-probe-bind-address", ":8081", "The address the probe endpoint binds to.")
 	flag.StringVar(&brokerAddr, "broker-bind-address", ":45000", "The address the broker endpoint binds to.")
 	flag.StringVar(&certFilePath, "broker-server-cert", "", "Cert file path for grpc server.")
 	flag.StringVar(&keyFilePath, "broker-server-key", "", "Key file path for grpc server.")
+	flag.BoolVar(&versionFlag, "version", false, "Print version.")
 
 	opts := zap.Options{
 		Development: false,
 	}
 	opts.BindFlags(flag.CommandLine)
 	flag.Parse()
 
+	if versionFlag {
+		fmt.Println(version.Version())
+		os.Exit(0)
+	}
+
 	ctrl.SetLogger(zap.New(zap.UseFlagOptions(&opts)))
 
 	setupLog := ctrl.Log.WithName("setup")

pkg/version/doc.go

@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: Apache-2.0
+// Copyright 2023 The Falco 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 version hold the logic for the version.
+package version

pkg/version/version.go

@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: Apache-2.0
+// Copyright 2023 The Falco 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 version
+
+import (
+	"fmt"
+	"runtime"
+)
+
+var (
+	// Semantic version that refers to ghe version (git tag).
+	// For prerelease versions, the build metadata on the
+	// semantic version is a git hash some as the gitCommit.
+	semVersion = "v0.0.0-master"
+
+	// sha1 from git, output of $(git rev-parse HEAD).
+	gitCommit = ""
+
+	// build date in ISO8601 format, output of $(date -u +'%Y-%m-%dT%H:%M:%SZ').
+	buildDate = "1970-01-01T00:00:00Z"
+)
+
+// Version returns the version.
+func Version() string {
+	return fmt.Sprintf("semVersion %s, gitCommit %s, buildDate %s, goVersion %s, compiler %s, platform %s/%s",
+		semVersion, gitCommit, buildDate, runtime.Version(), runtime.Compiler, runtime.GOOS, runtime.GOARCH)
+}