feat(nodeadm): support for nodeadm version display

nodeadm/Makefile

@@ -5,6 +5,10 @@ else
 GOBIN=$(shell go env GOBIN)
 endif
 
+# Version from git tags
+VERSION ?= 0.0.0
+LDFLAGS ?= -X 'main.version=$(VERSION)'
+
 # Setting SHELL to bash allows bash commands to be executed by recipes.
 # Options are set to exit when a recipe line exits non-zero or a piped command fails.
 SHELL = /usr/bin/env bash -o pipefail
@@ -78,7 +82,7 @@ test-e2e: build ## Run e2e tests.
 
 .PHONY: build
 build: ## Build binary.
-	GOOS=$(GOOS) go build -o $(LOCALBIN)/ ./cmd/...
+	GOOS=$(GOOS) go build -ldflags="$(LDFLAGS)" -o $(LOCALBIN)/ ./cmd/...
 
 .PHONY: run
 run: build ## Run binary.

nodeadm/cmd/nodeadm-internal/main.go

@@ -5,11 +5,16 @@ import (
 	"github.com/awslabs/amazon-eks-ami/nodeadm/internal/cli"
 )
 
+var (
+	version = "0.0.0"
+)
+
 func main() {
 	m := cli.Main{
 		Name:           "nodeadm-internal",
 		Description:    "Supporting tools for systems using nodeadm",
 		AdditionalHelp: "WARNING: There is no command-line stability guarantee!",
+		Version:        version,
 		Commands: []cli.Command{
 			boothook.NewBootHookCommand(),
 		},

nodeadm/cmd/nodeadm/main.go

@@ -9,9 +9,14 @@ import (
 	"github.com/awslabs/amazon-eks-ami/nodeadm/internal/cli"
 )
 
+var (
+	version = "0.0.0"
+)
+
 func main() {
 	flaggy.SetName("nodeadm")
 	flaggy.SetDescription("From zero to Node faster than you can say Elastic Kubernetes Service")
+	flaggy.SetVersion(version)
 	flaggy.DefaultParser.AdditionalHelpPrepend = "\nhttp://github.com/awslabs/amazon-eks-ami/nodeadm"
 	flaggy.DefaultParser.ShowHelpOnUnexpected = true
 

nodeadm/internal/cli/main.go

@@ -9,12 +9,14 @@ type Main struct {
 	Name           string
 	Description    string
 	AdditionalHelp string
+	Version        string
 	Commands       []Command
 }
 
 func (m *Main) Run() {
 	flaggy.SetName(m.Name)
 	flaggy.SetDescription(m.Description)
+	flaggy.SetVersion(m.Version)
 	if m.AdditionalHelp != "" {
 		flaggy.DefaultParser.AdditionalHelpPrepend = "\n" + m.AdditionalHelp
 	}