Set all version flags at build time so they have correct values (#593)

.goreleaser.yml

@@ -17,6 +17,7 @@ builds:
   -
     env:
       - CGO_ENABLED=0
+      - BUILDER=GoReleaser
     goos:
       - linux
       - darwin

Makefile

@@ -2,11 +2,17 @@
 
 export GO111MODULE=on
 
+GIT_COMMIT ?= $(shell git rev-parse --verify HEAD)
+GIT_VERSION ?= $(shell git describe --tags --always --dirty="-dev")
+DATE ?= $(shell date -u '+%Y-%m-%d %H:%M UTC')
+BUILDER ?= Makefile
+VERSION_FLAGS := -X "main.version=$(GIT_VERSION)" -X "main.date=$(DATE)" -X "main.commit=$(GIT_COMMIT)" -X "main.builtBy=$(BUILDER)"
+
 install:
 	@go mod vendor
 
 build:
-	@go build
+	@go build -ldflags='$(VERSION_FLAGS)'
 
 test:
 	@go test -v ./...

main.go

@@ -214,7 +214,7 @@ func init() {
 	// Output build info (version, commit, date and builtBy)
 	if versionFlag {
 		fmt.Printf(
-			"Current revive version %v commit %v, built @%v by %v.\n",
+			"Version:\t%s\nCommit:\t\t%s\nBuilt\t\t%s by %s\n",
 			version,
 			commit,
 			date,