Fix install target and versioning

Makefile

@@ -3,6 +3,10 @@
 CGO_ENABLED=0
 VERSION=$(shell git describe --abbrev=0 --tags)
 COMMIT=$(shell git rev-parse --short HEAD)
+BUILD=$(shell git show -s --pretty=format:%cI)
+GOCMD=go
+
+DESTDIR=/usr/local/bin
 
 all: dev
 
@@ -11,21 +15,21 @@ dev: build
 	@./bitcaskd --version
 
 build: clean generate
-	@go build \
+	@$(GOCMD) build \
 		-tags "netgo static_build" -installsuffix netgo \
-		-ldflags "-w -X $(shell go list)/internal.Version=$(VERSION) -X $(shell go list)/internal.Commit=$(COMMIT)" \
+		-ldflags "-w -X $(shell go list)/internal.Version=$(VERSION) -X $(shell go list)/internal.Commit=$(COMMIT) -X $(shell go list)/internal.Build=$(BUILD)" \
 		./cmd/bitcask/...
-	@go build \
+	@$(GOCMD) build \
 		-tags "netgo static_build" -installsuffix netgo \
-		-ldflags "-w -X $(shell go list)/internal.Version=$(VERSION) -X $(shell go list)/internal.Commit=$(COMMIT)" \
+		-ldflags "-w -X $(shell go list)/internal.Version=$(VERSION) -X $(shell go list)/internal.Commit=$(COMMIT) -X $(shell go list)/internal.Build=$(BUILD)" \
 		./cmd/bitcaskd/...
 
 generate:
-	@go generate $(shell go list)/...
+	@$(GOCMD) generate $(shell go list)/...
 
 install: build
-	@go install ./cmd/bitcask/...
+	@install -D -m 755 yarnd $(DESTDIR)/bitcask
-	@go install ./cmd/bitcaskd/...
+	@install -D -m 755 yarnc $(DESTDIR)/bitcaskd
 
 ifeq ($(PUBLISH), 1)
 image:
@@ -40,23 +44,23 @@ release:
 	@./tools/release.sh
 
 profile: build
-	@go test -cpuprofile cpu.prof -memprofile mem.prof -v -bench .
+	@$(GOCMD) test -cpuprofile cpu.prof -memprofile mem.prof -v -bench .
 
 bench: build
-	@go test -v -run=XXX -benchmem -bench=. .
+	@$(GOCMD) test -v -run=XXX -benchmem -bench=. .
 
 mocks:
 	@mockery -all -case underscore -output ./internal/mocks -recursive
 
 test: build
-	@go test -v \
+	@$(GOCMD) test -v \
 		-cover -coverprofile=coverage.txt -covermode=atomic \
 		-coverpkg=$(shell go list) \
 		-race \
 		.
 
 setup:
-	@go get github.com/vektra/mockery/...
+	@$(GOCMD) get github.com/vektra/mockery/...
 
 clean:
 	@git clean -f -d -X

internal/version.go

@@ -2,17 +2,49 @@ package internal
 
 import (
 	"fmt"
+	"runtime/debug"
+	"strings"
+)
+
+const (
+	defaultVersion = "0.0.0"
+	defaultCommit  = "HEAD"
+	defaultBuild   = "0000-01-01:00:00+00:00"
 )
 
 var (
-	// Version release version
+	// Version is the tagged release version in the form <major>.<minor>.<patch>
-	Version = "0.0.1"
+	// following semantic versioning and is overwritten by the build system.
+	Version = defaultVersion
 
-	// Commit will be overwritten automatically by the build system
+	// Commit is the commit sha of the build (normally from Git) and is overwritten
-	Commit = "HEAD"
+	// by the build system.
+	Commit = defaultCommit
+
+	// Build is the date and time of the build as an RFC3339 formatted string
+	// and is overwritten by the build system.
+	Build = defaultBuild
 )
 
-// FullVersion returns the full version and commit hash
+// FullVersion display the full version and build
 func FullVersion() string {
-	return fmt.Sprintf("%s@%s", Version, Commit)
+	var sb strings.Builder
+
+	isDefault := Version == defaultVersion && Commit == defaultCommit && Build == defaultBuild
+
+	if !isDefault {
+		sb.WriteString(fmt.Sprintf("%s@%s %s", Version, Commit, Build))
+	}
+
+	if info, ok := debug.ReadBuildInfo(); ok {
+		if isDefault {
+			sb.WriteString(fmt.Sprintf(" %s", info.Main.Version))
+		}
+		sb.WriteString(fmt.Sprintf(" %s", info.GoVersion))
+		if info.Main.Sum != "" {
+			sb.WriteString(fmt.Sprintf(" %s", info.Main.Sum))
+		}
+	}
+
+	return sb.String()
 }