Add check for app update (#88)

* add check for app update; fix ETUI error handling

* validate user args

cmd/cmd.go

@@ -38,7 +38,7 @@ func init() {
 
 func Execute() {
 	if err := rootCmd.Execute(); err != nil {
-		log.Errorf("could not start application: %w", err)
+		log.Errorf(err.Error())
 		os.Exit(1)
 	}
 }

cmd/root.go

@@ -9,7 +9,9 @@ import (
 	"github.com/anchore/imgbom/imgbom/presenter"
 	"github.com/anchore/imgbom/internal"
 	"github.com/anchore/imgbom/internal/bus"
+	"github.com/anchore/imgbom/internal/log"
 	"github.com/anchore/imgbom/internal/ui"
+	"github.com/anchore/imgbom/internal/version"
 	"github.com/spf13/cobra"
 	"github.com/wagoodman/go-partybus"
 )
@@ -26,9 +28,13 @@ Supports the following image sources:
 `, map[string]interface{}{
 		"appName": internal.ApplicationName,
 	}),
-	Args: cobra.MaximumNArgs(1),
+	Args: cobra.ExactArgs(1),
 	Run: func(cmd *cobra.Command, args []string) {
-		os.Exit(doRunCmd(cmd, args))
+		err := doRunCmd(cmd, args)
+		if err != nil {
+			log.Errorf(err.Error())
+			os.Exit(1)
+		}
 	},
 }
 
@@ -37,6 +43,21 @@ func startWorker(userInput string) <-chan error {
 	go func() {
 		defer close(errs)
 
+		if appConfig.CheckForAppUpdate {
+			isAvailable, newVersion, err := version.IsUpdateAvailable()
+			if err != nil {
+				log.Errorf(err.Error())
+			}
+			if isAvailable {
+				log.Infof("New version of %s is available: %s", internal.ApplicationName, newVersion)
+
+				bus.Publish(partybus.Event{
+					Type:  event.AppUpdateAvailable,
+					Value: newVersion,
+				})
+			}
+		}
+
 		catalog, scope, _, err := imgbom.Catalog(userInput, appConfig.ScopeOpt)
 		if err != nil {
 			errs <- fmt.Errorf("failed to catalog input: %+v", err)
@@ -51,10 +72,9 @@ func startWorker(userInput string) <-chan error {
 	return errs
 }
 
-func doRunCmd(_ *cobra.Command, args []string) int {
-	errs := startWorker(args[0])
-
+func doRunCmd(_ *cobra.Command, args []string) error {
+	userInput := args[0]
+	errs := startWorker(userInput)
 	ux := ui.Select(appConfig.CliOptions.Verbosity > 0, appConfig.Quiet)
-
 	return ux(errs, eventSubscription)
 }

cmd/version.go

@@ -4,16 +4,11 @@ import (
 	"fmt"
 
 	"github.com/anchore/imgbom/internal"
+	"github.com/anchore/imgbom/internal/version"
 	"github.com/spf13/cobra"
 )
 
-type Version struct {
-	Version   string
-	Commit    string
-	BuildTime string
-}
-
-var version *Version
+var showVerboseVersionInfo bool
 
 var versionCmd = &cobra.Command{
 	Use:   "version",
@@ -22,13 +17,23 @@ var versionCmd = &cobra.Command{
 }
 
 func init() {
+	versionCmd.Flags().BoolVarP(&showVerboseVersionInfo, "verbose", "v", false, "show additional version information")
+
 	rootCmd.AddCommand(versionCmd)
 }
 
-func SetVersion(v *Version) {
-	version = v
-}
-
-func printVersion(cmd *cobra.Command, args []string) {
-	fmt.Printf("%s %s\n", internal.ApplicationName, version.Version)
+func printVersion(_ *cobra.Command, _ []string) {
+	versionInfo := version.FromBuild()
+	if showVerboseVersionInfo {
+		fmt.Println("Application:  ", internal.ApplicationName)
+		fmt.Println("Version:      ", versionInfo.Version)
+		fmt.Println("BuildDate:    ", versionInfo.BuildDate)
+		fmt.Println("GitCommit:    ", versionInfo.GitCommit)
+		fmt.Println("GitTreeState: ", versionInfo.GitTreeState)
+		fmt.Println("Platform:     ", versionInfo.Platform)
+		fmt.Println("GoVersion:    ", versionInfo.GoVersion)
+		fmt.Println("Compiler:     ", versionInfo.Compiler)
+	} else {
+		fmt.Printf("%s %s\n", internal.ApplicationName, versionInfo.Version)
+	}
 }