Add build information to binaries

Makefile

@@ -7,14 +7,30 @@
 .PHONY : docker-apps docker-bin docker-volume 
 .PHONY : docker-run docker-stop     
 
+VERSION := 0.1.0 # 0.1.0 is the first possible version in semver
+
+RFC_3339 := "+%Y-%m-%dT%H:%M:%SZ"
+DATE := $(shell date -u $(RFC_3339))
+COMMIT := $(shell git rev-list -1 HEAD)
+
+PROJECT_BASE := github.com/SkycoinProject/skywire-mainnet
 OPTS?=GO111MODULE=on
 DOCKER_IMAGE?=skywire-runner # docker image to use for running skywire-visor.`golang`, `buildpack-deps:stretch-scm`  is OK too
 DOCKER_NETWORK?=SKYNET 
 DOCKER_NODE?=SKY01
 DOCKER_OPTS?=GO111MODULE=on GOOS=linux # go options for compiling for docker container
 TEST_OPTS?=-race -tags no_ci -cover -timeout=5m
 TEST_OPTS_NOCI?=-race -cover -timeout=5m -v
-BUILD_OPTS?=
+
+BUILDINFO_PATH := $(PROJECT_BASE)/pkg/buildinfo
+
+BUILDINFO_VERSION := -X $(BUILDINFO_PATH).Version=$(VERSION)
+BUILDINFO_DATE := -X $(BUILDINFO_PATH).Date=$(DATE)
+BUILDINFO_COMMIT := -X $(BUILDINFO_PATH).Commit=$(COMMIT)
+
+BUILDINFO?=-ldflags="$(BUILDINFO_VERSION) $(BUILDINFO_DATE) $(BUILDINFO_COMMIT)"
+
+BUILD_OPTS?=$(BUILDINFO)
 
 check: lint test ## Run linters and tests
 
@@ -75,9 +91,9 @@ install-linters: ## Install linters
 	${OPTS} go get -u golang.org/x/tools/cmd/goimports
 
 format: ## Formats the code. Must have goimports installed (use make install-linters).
-	${OPTS} goimports -w -local github.com/SkycoinProject/skywire ./pkg
-	${OPTS} goimports -w -local github.com/SkycoinProject/skywire ./cmd
-	${OPTS} goimports -w -local github.com/SkycoinProject/skywire ./internal
+	${OPTS} goimports -w -local ${PROJECT_BASE} ./pkg
+	${OPTS} goimports -w -local ${PROJECT_BASE} ./cmd
+	${OPTS} goimports -w -local ${PROJECT_BASE} ./internal
 
 dep: ## Sorts dependencies
 	${OPTS} go mod vendor -v
@@ -158,7 +174,6 @@ run-syslog: ## Run syslog-ng in docker. Logs are mounted under /tmp/syslog
 	-docker container rm syslog-ng -f
 	docker run -d -p 514:514/udp  -v /tmp/syslog:/var/log  --name syslog-ng balabit/syslog-ng:latest 
 
-
 integration-startup: ## Starts up the required transports between `skywire-visor`s of interactive testing environment
 	./integration/startup.sh
 

cmd/hypervisor/commands/gen-config.go

@@ -15,21 +15,21 @@ var (
 	output        string
 	replace       bool
 	configLocType = pathutil.WorkingDirLoc
-	testenv       bool
+	testEnv       bool
 )
 
 // nolint:gochecknoinits
 func init() {
 	outputUsage := "path of output config file. Uses default of 'type' flag if unspecified."
 	replaceUsage := "whether to allow rewrite of a file that already exists."
 	configLocTypeUsage := fmt.Sprintf("config generation mode. Valid values: %v", pathutil.AllConfigLocationTypes())
-	testEnv := "whether to use production or test deployment service."
+	testEnvUsage := "whether to use production or test deployment service."
 
 	rootCmd.AddCommand(genConfigCmd)
 	genConfigCmd.Flags().StringVarP(&output, "output", "o", "", outputUsage)
 	genConfigCmd.Flags().BoolVarP(&replace, "replace", "r", false, replaceUsage)
 	genConfigCmd.Flags().VarP(&configLocType, "type", "m", configLocTypeUsage)
-	genConfigCmd.Flags().BoolVarP(&testenv, "testing-environment", "t", false, testEnv)
+	genConfigCmd.Flags().BoolVarP(&testEnv, "testing-environment", "t", false, testEnvUsage)
 }
 
 // nolint:gochecknoglobals
@@ -50,11 +50,11 @@ var genConfigCmd = &cobra.Command{
 		var conf hypervisor.Config
 		switch configLocType {
 		case pathutil.WorkingDirLoc:
-			conf = hypervisor.GenerateWorkDirConfig(testenv)
+			conf = hypervisor.GenerateWorkDirConfig(testEnv)
 		case pathutil.HomeLoc:
-			conf = hypervisor.GenerateHomeConfig(testenv)
+			conf = hypervisor.GenerateHomeConfig(testEnv)
 		case pathutil.LocalLoc:
-			conf = hypervisor.GenerateLocalConfig(testenv)
+			conf = hypervisor.GenerateLocalConfig(testEnv)
 		default:
 			log.Fatalln("invalid config type:", configLocType)
 		}

pkg/buildinfo/buildinfo.go

@@ -0,0 +1,9 @@
+package buildinfo
+
+const unknown = "unknown"
+
+var (
+	Version = unknown
+	Commit  = unknown
+	Date    = unknown
+)