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

cmd/version.go

@@ -1,11 +1,10 @@
 package cmd
 
 import (
-	"fmt"
+	"github.com/spf13/cobra"
 
 	"github.com/gostor/gotgt/pkg/api/client"
 	"github.com/gostor/gotgt/pkg/version"
-	"github.com/spf13/cobra"
 )
 
 func newVersionCommand(cli *client.Client) *cobra.Command {
@@ -14,7 +13,7 @@ func newVersionCommand(cli *client.Client) *cobra.Command {
 		Short: "Print the version number of gotgt",
 		Long:  `All software has versions. This is Gotgt 's`,
 		Run: func(cmd *cobra.Command, args []string) {
-			fmt.Printf("Gotgt %s -- HEAD\n", version.Version)
+			version.PrintVersionAndExit()
 		},
 	}
 	return cmd

pkg/version/version.go

@@ -17,8 +17,41 @@ limitations under the License.
 // Package version provides the Version information.
 package version
 
+import (
+	"fmt"
+	"os"
+	"runtime"
+)
+
 const (
-	Version = "0.1"
+	// Version shows the version of gotgt.
+	Version = "Not provided."
 	// SCSI version string MUST be shorter than 4 characters
 	SCSIVersion = "0.1"
+	// GitSHA shoows the git commit id of volcano.
+	GitSHA = "Not provided."
+	// Built shows the built time of the binary.
+	Built = "Not provided."
+
+	apiVersion = "v1alpha1"
 )
+
+// PrintVersionAndExit prints versions from the array returned by Info() and exit
+func PrintVersionAndExit() {
+	for _, i := range Info(apiVersion) {
+		fmt.Printf("%v\n", i)
+	}
+	os.Exit(0)
+}
+
+// Info returns an array of various service versions
+func Info(apiVersion string) []string {
+	return []string{
+		fmt.Sprintf("API Version: %s", apiVersion),
+		fmt.Sprintf("Version: %s", Version),
+		fmt.Sprintf("Git SHA: %s", GitSHA),
+		fmt.Sprintf("Built At: %s", Built),
+		fmt.Sprintf("Go Version: %s", runtime.Version()),
+		fmt.Sprintf("Go OS/Arch: %s/%s", runtime.GOOS, runtime.GOARCH),
+	}
+}