wallet: update passphrase user experience.

For users don't want to set/manage a passphrase a default passphrase
"passphrase" will be used during wallet creation.

At startup, the wallet tries to unlock itself using the default
passphrase, or a user provided one (using -p).

Users that prefer a passphrase can override the default one at wallet
creation time using -p, or use the walletpassphrase rpc when
the wallet is running. This will prevent the wallet from auto-unlock,
and preserve the lock-by-default behavior.

config.go

@@ -58,7 +58,7 @@ type config struct {
 	DBTimeout   time.Duration           `long:"dbtimeout" description:"The timeout value to use when opening the wallet database."`
 
 	// Passphrase options
-	Passphrase string `short:"p" long:"passphrase" default-mask:"-" description:"The wallet passphrase (default: \"insecurepassphrase\")"`
+	Passphrase string `short:"p" long:"passphrase" default-mask:"-" description:"The wallet passphrase (default: \"passphrase\")"`
 
 	// RPC client options
 	RPCConnect       string                  `short:"c" long:"rpcconnect" description:"Hostname/IP and port of lbcd RPC server to connect to (default localhost:9245, testnet: localhost:19245, regtest: localhost:29245)"`

lbcwallet.go

@@ -85,6 +85,11 @@ func walletMain() error {
 
 	loader.RunAfterLoad(func(w *wallet.Wallet) {
 		startWalletRPCServices(w, legacyRPCServer)
+		log.Infof("Unlocking wallet with the default or specified passphrase...")
+		err = w.Unlock([]byte(cfg.Passphrase), nil)
+		if err != nil {
+			log.Infof("Unable to unlock wallet: %v", err)
+		}
 	})
 
 	_, err = loader.OpenExistingWallet()

walletsetup.go

@@ -46,12 +46,9 @@ func createWallet(cfg *config) error {
 	)
 
 	// Start by prompting for the passphrase.
-	reader := bufio.NewReader(os.Stdin)
-	privPass, err := prompt.Passphrase(true)
-	if err != nil {
-		return err
-	}
+	passphrase := []byte(cfg.Passphrase)
 
+	reader := bufio.NewReader(os.Stdin)
 	// Ascertain the wallet generation seed.  This will either be an
 	// automatically generated value the user has already confirmed or a
 	// value the user has entered which has already been validated.
@@ -61,7 +58,7 @@ func createWallet(cfg *config) error {
 	}
 
 	fmt.Println("Creating the wallet...")
-	w, err := loader.CreateNewWallet(privPass, seed, bday)
+	w, err := loader.CreateNewWallet(passphrase, seed, bday)
 	if err != nil {
 		return err
 	}