add version

Signed-off-by: Lei Xue <vfs@live.com>

Makefile

@@ -1,4 +1,14 @@
 BIN_DIR=_output/cmd/bin
+REPO_PATH="github.com/gostor/gotgt"
+REL_OSARCH="linux/amd64"
+GitSHA=`git rev-parse HEAD`
+Date=`date "+%Y-%m-%d %H:%M:%S"`
+RELEASE_VERSION=$(shell git describe --tags --always --dirty)
+IMG_BUILDER=docker
+LD_FLAGS=" \
+    -X '${REPO_PATH}/pkg/version.GitSHA=${GitSHA}' \
+    -X '${REPO_PATH}/pkg/version.Built=${Date}'   \
+    -X '${REPO_PATH}/pkg/version.Version=${RELEASE_VERSION}'"
 
 all: init build
 
@@ -6,10 +16,10 @@ deps:
 	go mod download
 
 build: init
-	go build -o ${BIN_DIR}/gotgt gotgt.go
+	go build -ldflags ${LD_FLAGS} -o ${BIN_DIR}/gotgt gotgt.go
 
 build-nocgo: init
-	CGO_ENABLED=0 go build -o ${BIN_DIR}/gotgt gotgt.go
+	CGO_ENABLED=0 go build -ldflags ${LD_FLAGS} -o ${BIN_DIR}/gotgt gotgt.go
 
 verify:
 	hack/verify-gofmt.sh