add the version command

Makefile

@@ -1,17 +1,42 @@
 .DEFAULT_GOAL: build
+
+
+# The CLI binary to build
+BIN ?= kyverno
+
+GIT_VERSION := $(shell git describe --dirty --always --tags)
+GIT_HASH := $(shell git log -1 --pretty=format:"%H")
+TIMESTAMP := $(shell date '+%Y-%m-%d_%I:%M:%S%p')
+
 PACKAGE ?=github.com/nirmata/kyverno
 MAIN ?=$(PACKAGE)
-LD_FLAGS ="-s -w"
+
+LD_FLAGS="-s -w -X $(PACKAGE)/pkg/kyverno/version.buildVersion=$(GIT_VERSION) -X $(PACKAGE)/pkg/kyverno/version.buildHash=$(GIT_HASH) -X $(PACKAGE)/pkg/kyverno/version.buildTime=$(TIMESTAMP)"
 
 REPO=nirmata/kyverno
 TAG=0.1
 
+GOOS ?= $(shell go env GOOS)
+OUTPUT=$(shell pwd)/_output/cli/$(BIN)
+
 build:
 	GOOS=linux go build -ldflags=$(LD_FLAGS) $(MAIN)
 
 local:
 	go build -ldflags=$(LD_FLAGS) $(MAIN)
 
+cli: cli-dirs
+	GOOS=$(GOOS) \
+    go build \
+    -o $(OUTPUT) \
+    -ldflags $(LD_FLAGS) \
+    $(PACKAGE)/cmd/$(BIN)
+
+	go build -ldflags=$(LD_FLAGS) $(CLI)
+
+cli-dirs:
+	@mkdir -p _output/cli
+
 image:
 	docker build -t $(REPO):$(TAG) .
 	docker tag $(REPO):$(TAG) $(REPO):latest

pkg/kyverno/cmd.go

@@ -5,6 +5,7 @@ import (
 	"os"
 
 	"github.com/nirmata/kyverno/pkg/kyverno/apply"
+	"github.com/nirmata/kyverno/pkg/kyverno/version"
 	"github.com/spf13/cobra"
 )
 
@@ -21,5 +22,6 @@ func NewKyvernoCommand(in io.Reader, out, errout io.Writer) *cobra.Command {
 	}
 
 	cmds.AddCommand(apply.NewCmdApply(in, out, errout))
+	cmds.AddCommand(version.NewCmdVersion(out))
 	return cmds
 }

pkg/kyverno/version/version.go

@@ -0,0 +1,34 @@
+package version
+
+import (
+	"fmt"
+	"io"
+
+	"github.com/spf13/cobra"
+)
+
+var (
+	buildVersion = "--"
+	buildHash    = "--"
+	buildTime    = "--"
+)
+
+// NewCmdVersion is a command to display the build version
+func NewCmdVersion(cmdOut io.Writer) *cobra.Command {
+
+	versionCmd := &cobra.Command{
+		Use:   "version",
+		Short: "",
+		Run: func(cmd *cobra.Command, args []string) {
+			showVersion()
+		},
+	}
+
+	return versionCmd
+}
+
+func showVersion() {
+	fmt.Printf("Version: %s\n", buildVersion)
+	fmt.Printf("Time: %s\n", buildTime)
+	fmt.Printf("Git commit ID: %s\n", buildHash)
+}