Print deamon info on startup

Adds a VERSION file with the current daemon version, sets the NVR from
that file as a string during build and prints that version along with
other information during the daemon and oneshot commands so that
operator using selinuxd as an operand can know what exact selinuxd
version was being used.

Author: jhrozek

Makefile

@@ -1,3 +1,4 @@
+PROJECT=selinuxd
 BIN=$(BINDIR)/selinuxdctl
 BINDIR=bin
 POLICYDIR=/etc/selinux.d
@@ -6,6 +7,8 @@ SRC=$(shell find . -name "*.go")
 
 GO?=go
 
+GO_PROJECT := github.com/containers/$(PROJECT)
+
 # External Helper variables
 
 GOLANGCI_LINT_VERSION=1.33.0
@@ -17,7 +20,7 @@ GOLANGCI_LINT_URL=https://github.com/golangci/golangci-lint/releases/download/v$
 
 CONTAINER_RUNTIME?=podman
 
-IMAGE_NAME=selinuxd
+IMAGE_NAME=$(PROJECT)
 IMAGE_TAG=latest
 
 IMAGE_REF=$(IMAGE_NAME):$(IMAGE_TAG)
@@ -28,6 +31,14 @@ FEDORA_IMAGE_REPO?=quay.io/security-profiles-operator/$(IMAGE_NAME)-fedora:$(IMA
 
 TEST_OS?=fedora
 
+DATE_FMT = +'%Y-%m-%dT%H:%M:%SZ'
+BUILD_DATE ?= $(shell date -u "$(DATE_FMT)")
+VERSION := $(shell cat VERSION)
+
+LDVARS := \
+	-X $(GO_PROJECT)/pkg/version.buildDate=$(BUILD_DATE) \
+	-X $(GO_PROJECT)/pkg/version.version=$(VERSION)
+
 SEMODULE_BACKEND?=policycoreutils
 ifeq ($(SEMODULE_BACKEND), semanage)
 	BUILDTAGS:=semanage
@@ -45,11 +56,11 @@ all: build
 build: $(BIN)
 
 $(BIN): $(BINDIR) $(SRC) pkg/semodule/semanage/callbacks.c
-	$(GO) build -tags '$(BUILDTAGS)' -o $(BIN) .
+	$(GO) build -ldflags "$(LDVARS)" -tags '$(BUILDTAGS)' -o $(BIN) .
 
 .PHONY: test
 test:
-	$(GO) test -tags '$(BUILDTAGS)' -race github.com/containers/selinuxd/pkg/...
+	$(GO) test -tags '$(BUILDTAGS)' -race $(GO_PROJECT)/pkg/...
 
 .PHONY: e2e
 e2e:

VERSION

@@ -0,0 +1 @@
+0.2.99

cmd/daemon.go

@@ -17,6 +17,7 @@ package cmd
 
 import (
 	"fmt"
+	"github.com/containers/selinuxd/pkg/version"
 	"os"
 	"os/signal"
 	"syscall"
@@ -100,6 +101,8 @@ func daemonCmdFunc(rootCmd *cobra.Command, _ []string) {
 		syscall.Exit(1)
 	}
 
+	version.PrintInfoPermissive(logger)
+
 	exitSignal := make(chan os.Signal, 1)
 	done := make(chan bool)
 	signal.Notify(exitSignal, syscall.SIGINT, syscall.SIGTERM)

cmd/oneshot.go

@@ -17,6 +17,7 @@ package cmd
 
 import (
 	"fmt"
+	"github.com/containers/selinuxd/pkg/version"
 	"os"
 	"syscall"
 
@@ -79,6 +80,8 @@ func oneshotCmdFunc(rootCmd *cobra.Command, _ []string) {
 		syscall.Exit(1)
 	}
 
+	version.PrintInfoPermissive(logger)
+
 	opts, err := parseOneShotFlags(rootCmd)
 	if err != nil {
 		logger.Error(err, "Parsing flags")

pkg/version/version.go

@@ -0,0 +1,49 @@
+package version
+
+import (
+	"fmt"
+	"github.com/go-logr/logr"
+	"runtime"
+)
+
+var (
+	buildDate string // build date in ISO8601 format, output of $(date -u +'%Y-%m-%dT%H:%M:%SZ')
+	version   string // the current version of the daemon
+)
+
+type Info struct {
+	Version   string `json:"version,omitempty"`
+	BuildDate string `json:"buildDate,omitempty"`
+	Compiler  string `json:"compiler,omitempty"`
+	Platform  string `json:"platform,omitempty"`
+}
+
+// AsKeyValues returns a key value slice of the info.
+func (i *Info) AsKeyValues() []interface{} {
+	return []interface{}{
+		"version", i.Version,
+		"buildDate", i.BuildDate,
+		"compiler", i.Compiler,
+		"platform", i.Platform,
+	}
+}
+
+func getInfo() *Info {
+	return &Info{
+		Version:   version,
+		BuildDate: buildDate,
+		Compiler:  runtime.Compiler,
+		Platform:  fmt.Sprintf("%s/%s", runtime.GOOS, runtime.GOARCH),
+	}
+}
+
+func printInfo(logger logr.Logger, info *Info) {
+	logger.Info(
+		"selinuxd information",
+		info.AsKeyValues()...,
+	)
+}
+
+func PrintInfoPermissive(logger logr.Logger) {
+	printInfo(logger, getInfo())
+}