add build version information logging

This adds build version information to the binary and logs it.

Signed-off-by: Ukri Niemimuukko <ukri.niemimuukko@intel.com>

Author: uniemimu

gpu-aware-scheduling/Makefile

@@ -3,11 +3,23 @@ IMAGE_TAG=:$(TAG)
 endif
 
 GOLICENSES_VERSION?=v1.5.0
+BUILD_OUTPUT_DIR?=./bin
 
 ifneq ("$(wildcard licenses/)","")
 LOCAL_LICENSES=TRUE
 endif
 
+GOVERSION=$(shell go version | sed 's/^[^0-9]*//' | cut -d' ' -f1)
+BUILDDATE=$(shell date "+%Y%m%d-%T")
+VERSION=$(shell git describe --tags --long --match gpu-aware-scheduling/v*)
+
+LDFLAGS = \
+-s -w \
+-X main.version=$(VERSION) \
+-X main.buildDate=$(BUILDDATE) \
+-X main.goVersion=$(GOVERSION)
+
+
 .PHONY: test all build image release-image format clean licenses mock e2e lint
 
 test:
@@ -19,7 +31,7 @@ lint: format build
 	golangci-lint run
 
 build:
-	CGO_ENABLED=0 GO111MODULE=on go build -ldflags="-s -w" -o ./bin/extender ./cmd/gas-scheduler-extender
+	CGO_ENABLED=0 GO111MODULE=on go build -ldflags="$(LDFLAGS)" -o $(BUILD_OUTPUT_DIR)/extender ./cmd/gas-scheduler-extender
 
 #note: you can speed up subsequent docker builds by doing "go mod vendor"
 #note: you can further speed up subsequent docker builds by doing "make licenses"

gpu-aware-scheduling/cmd/gas-scheduler-extender/main.go

@@ -12,6 +12,19 @@ import (
 	"k8s.io/klog/v2"
 )
 
+// build variables need to be globals
+//
+//nolint:gochecknoglobals
+var (
+	goVersion = "value is set during build"
+	buildDate = "value is set during build"
+	version   = "value is set during build"
+)
+
+const (
+	l1 = klog.Level(1)
+)
+
 func main() {
 	var (
 		kubeConfig, port, certFile, keyFile, caFile, balancedRes string
@@ -29,6 +42,8 @@ func main() {
 	klog.InitFlags(nil)
 	flag.Parse()
 
+	klog.V(l1).Infof("%s built on %s with go %s", version, buildDate, goVersion)
+
 	kubeClient, _, err := extender.GetKubeClient(kubeConfig)
 	if err != nil {
 		klog.Error("couldn't get kube client, cannot continue: ", err.Error())

gpu-aware-scheduling/deploy/images/Dockerfile_gpu-extender

@@ -7,7 +7,7 @@ ARG LOCAL_LICENSES
 COPY . /src_root
 WORKDIR /src_root/gpu-aware-scheduling
 RUN mkdir -p /install_root/etc && adduser --disabled-password --quiet --gecos "" -u 10001 gas && tail -1 /etc/passwd > /install_root/etc/passwd \
-    && CGO_ENABLED=0 GO111MODULE=on go build -ldflags="-s -w" -o /install_root/extender ./cmd/gas-scheduler-extender \
+    && BUILD_OUTPUT_DIR=/install_root make build \
     && if [ -z "$LOCAL_LICENSES" ] ; then \
     GO111MODULE=on go run github.com/google/go-licenses@${GOLICENSES_VERSION} save "./cmd/gas-scheduler-extender" --save_path /install_root/licenses ; \
     else cp -r licenses /install_root/ ; fi