Add --version flag

Makefile

@@ -29,6 +29,12 @@ ifeq ($(GOHOSTOS),darwin)
   SED_I=sed -i ''
 endif
 
+REPO_INFO=$(shell git config --get remote.origin.url)
+
+ifndef COMMIT
+  COMMIT := git-$(shell git rev-parse --short HEAD)
+endif
+
 PKG=github.com/lemonldap-ng-controller/lemonldap-ng-controller
 
 ARCH ?= $(shell go env GOARCH)
@@ -130,7 +136,7 @@ clean:
 .PHONY: build
 build: clean
 	CGO_ENABLED=0 GOOS=${GOOS} GOARCH=${GOARCH} go build -a -installsuffix cgo \
-		-ldflags "-s -w" \
+		-ldflags "-s -w -X ${PKG}/version.RELEASE=${TAG} -X ${PKG}/version.COMMIT=${COMMIT} -X ${PKG}/version.REPO=${REPO_INFO}" \
 		-o ${TEMP_DIR}/rootfs/lemonldap-ng-controller ${PKG}/cmd
 
 .PHONY: verify-all
@@ -139,7 +145,6 @@ verify-all:
 
 .PHONY: test
 test:
-	@echo "+ $@"
 	@go test -v -race -tags "$(BUILDTAGS) cgo" $(shell go list ${PKG}/... | grep -v vendor | grep -v '/test/e2e')
 
 .PHONY: e2e-image

README.md

@@ -157,6 +157,7 @@ Usage of /lemonldap-ng-controller:
       --stderrthreshold severity                      logs at or above this threshold go to stderr (default 2)
       --sync-period duration                          Relist and confirm cloud resources this often (default 10m0s)
   -v, --v Level                                       log level for V logs
+      --version                                       Shows release information about the LemonLDAP::NG controller
       --vmodule moduleSpec                            comma-separated list of pattern=N settings for file-filtered logging
       --watch-namespace string                        Namespace to watch for Ingress. Default is to watch all namespaces
 ```

cmd/main.go

@@ -19,6 +19,7 @@ package main
 
 import (
 	goflag "flag"
+	"fmt"
 	"os"
 	"time"
 
@@ -36,13 +37,15 @@ import (
 	fsos "github.com/lemonldap-ng-controller/lemonldap-ng-controller/internal/filesystem/os"
 	"github.com/lemonldap-ng-controller/lemonldap-ng-controller/internal/lemonldapng/converter"
 	"github.com/lemonldap-ng-controller/lemonldap-ng-controller/internal/signals"
+	"github.com/lemonldap-ng-controller/lemonldap-ng-controller/version"
 )
 
 var (
 	config *controller.Configuration = &controller.Configuration{
 		FS: &fsos.Filesystem{},
 	}
 	convertMode bool
+	versionMode bool
 )
 
 func main() {
@@ -64,6 +67,12 @@ func main() {
 	// set up signals so we handle the first shutdown signal gracefully
 	stopCh := signals.SetupSignalHandler()
 
+	if versionMode {
+		fmt.Println(version.String())
+		return
+	}
+	glog.Infof(version.Short())
+
 	if convertMode {
 		err := converter.Run(config.ConfigMapName, os.Stdin, os.Stdout)
 		if err != nil {
@@ -104,4 +113,5 @@ func init() {
 	flag.BoolVar(&config.ForceNamespaceIsolation, "force-namespace-isolation", false, "Force namespace isolation. This flag is required to avoid the reference of secrets or configmaps located in a different namespace than the specified in the flag --watch-namespace")
 	flag.StringVar(&config.LemonLDAPConfigurationDirectory, "lemonldap-ng-configuration-directory", "/var/lib/lemonldap-ng/conf", "LemonLDAP::NG configuration directory")
 	flag.BoolVar(&convertMode, "convert", false, "Convert lmConf-n.js from standard input to ConfigMap")
+	flag.BoolVar(&versionMode, "version", false, "Shows release information about the LemonLDAP::NG controller")
 }

version/version.go

@@ -0,0 +1,44 @@
+/*
+Copyright 2018 Mathieu Parent <math.parent@gmail.com>
+
+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"
+
+var (
+	// RELEASE returns the release version
+	RELEASE = "UNKNOWN"
+	// REPO returns the git repository URL
+	REPO = "UNKNOWN"
+	// COMMIT returns the short sha from git
+	COMMIT = "UNKNOWN"
+)
+
+// String returns information about the release.
+func String() string {
+	return fmt.Sprintf(`-------------------------------------------------------------------------------
+LemonLDAP::NG controller
+  Release:    %v
+  Build:      %v
+  Repository: %v
+-------------------------------------------------------------------------------
+`, RELEASE, COMMIT, REPO)
+}
+
+// Short returns one-line information about the release.
+func Short() string {
+	return fmt.Sprintf(`LemonLDAP::NG controller %v (build: %v, repository: %v)`, RELEASE, COMMIT, REPO)
+}