add install function

install pem files directly to an apc ups

pkg/app/app.go

@@ -31,27 +31,21 @@ func Start() {
 		logger: makeZapLogger(&initLogLevel),
 	}
 
-	// get config
-	app.getConfig()
+	// log start
+	app.logger.Infof("apc-p15-tool v%s", appVersion)
+
+	// get & parse config
+	err := app.getConfig()
 
 	// re-init logger with configured log level
 	app.logger = makeZapLogger(app.config.logLevel)
 
-	// log start
-	app.logger.Infof("apc-p15-tool v%s", appVersion)
-
-	// get config
-	app.getConfig()
-
-	// run it
-	exitCode := 0
-	err := app.cmd.ParseAndRun(context.Background(), os.Args[1:], ff.WithEnvVarPrefix(environmentVarPrefix))
+	// deal with config err (after logger re-init)
 	if err != nil {
-		exitCode = 1
+		exitCode := 0
 
 		if errors.Is(err, ff.ErrHelp) {
 			// help explicitly requested
-			exitCode = 0
 			app.logger.Info("\n\n", ffhelp.Command(app.cmd))
 
 		} else if errors.Is(err, ff.ErrDuplicateFlag) ||
@@ -59,13 +53,28 @@ func Start() {
 			errors.Is(err, ff.ErrNoExec) ||
 			errors.Is(err, ErrExtraArgs) {
 			// other error that suggests user needs to see help
+			exitCode = 1
 			app.logger.Error(err)
 			app.logger.Info("\n\n", ffhelp.Command(app.cmd))
 
 		} else {
 			// any other error
+			exitCode = 1
 			app.logger.Error(err)
 		}
+
+		os.Exit(exitCode)
+	}
+
+	// get config
+	app.getConfig()
+
+	// run it
+	exitCode := 0
+	err = app.cmd.Run(context.Background())
+	if err != nil {
+		exitCode = 1
+		app.logger.Error(err)
 	}
 
 	app.logger.Info("apc-p15-tool done")