Saner error output on multiple attempts to init wallet (#2021)

* less scary error message on duplicate wallet commit

* rustfmt

src/bin/cmd/wallet.rs

@@ -106,6 +106,13 @@ pub fn wallet_command(wallet_args: &ArgMatches, config: GlobalWalletConfig) -> i
 	// Decrypt the seed from the seed file and derive the keychain.
 	// Generate the initial wallet seed if we are running "wallet init".
 	if let ("init", Some(r)) = wallet_args.subcommand() {
+		if let Err(e) = WalletSeed::seed_file_exists(&wallet_config) {
+			println!(
+				"Not creating wallet - Wallet seed file already exists at {}",
+				e.inner
+			);
+			return 0;
+		}
 		let list_length = match r.is_present("short_wordlist") {
 			false => 32,
 			true => 16,

wallet/src/error.rs

@@ -25,7 +25,7 @@ use failure::{Backtrace, Context, Fail};
 /// Error definition
 #[derive(Debug)]
 pub struct Error {
-	inner: Context<ErrorKind>,
+	pub inner: Context<ErrorKind>,
 }
 
 /// Wallet errors, mostly wrappers around underlying crypto or I/O errors.
@@ -80,8 +80,8 @@ pub enum ErrorKind {
 	DuplicateTransactionId,
 
 	/// Wallet seed already exists
-	#[fail(display = "Wallet seed exists error")]
-	WalletSeedExists,
+	#[fail(display = "{}", _0)]
+	WalletSeedExists(String),
 
 	/// Wallet seed doesn't exist
 	#[fail(display = "Wallet seed doesn't exist error")]

wallet/src/types.rs

@@ -135,6 +135,17 @@ impl WalletSeed {
 		WalletSeed(seed)
 	}
 
+	pub fn seed_file_exists(wallet_config: &WalletConfig) -> Result<(), Error> {
+		let seed_file_path = &format!(
+			"{}{}{}",
+			wallet_config.data_file_dir, MAIN_SEPARATOR, SEED_FILE,
+		);
+		if Path::new(seed_file_path).exists() {
+			return Err(ErrorKind::WalletSeedExists(seed_file_path.to_owned()))?;
+		}
+		Ok(())
+	}
+
 	pub fn recover_from_phrase(
 		wallet_config: &WalletConfig,
 		word_list: &str,
@@ -144,14 +155,7 @@ impl WalletSeed {
 			"{}{}{}",
 			wallet_config.data_file_dir, MAIN_SEPARATOR, SEED_FILE,
 		);
-		if Path::new(seed_file_path).exists() {
-			error!(
-				"wallet seed file {} exists. \
-				 Please backup and delete this file before attempting recovery.",
-				seed_file_path
-			);
-			return Err(ErrorKind::WalletSeedExists)?;
-		}
+		let _ = WalletSeed::seed_file_exists(wallet_config)?;
 		let seed = WalletSeed::from_mnemonic(word_list)?;
 		let enc_seed = EncryptedWalletSeed::from_seed(&seed, password)?;
 		let enc_seed_json = serde_json::to_string_pretty(&enc_seed).context(ErrorKind::Format)?;
@@ -183,20 +187,16 @@ impl WalletSeed {
 		);
 
 		warn!("Generating wallet seed file at: {}", seed_file_path);
+		let _ = WalletSeed::seed_file_exists(wallet_config)?;
 
-		if Path::new(seed_file_path).exists() {
-			Err(ErrorKind::WalletSeedExists)?
-		} else {
-			let seed = WalletSeed::init_new(seed_length);
-			let enc_seed = EncryptedWalletSeed::from_seed(&seed, password)?;
-			let enc_seed_json =
-				serde_json::to_string_pretty(&enc_seed).context(ErrorKind::Format)?;
-			let mut file = File::create(seed_file_path).context(ErrorKind::IO)?;
-			file.write_all(&enc_seed_json.as_bytes())
-				.context(ErrorKind::IO)?;
-			seed.show_recovery_phrase()?;
-			Ok(seed)
-		}
+		let seed = WalletSeed::init_new(seed_length);
+		let enc_seed = EncryptedWalletSeed::from_seed(&seed, password)?;
+		let enc_seed_json = serde_json::to_string_pretty(&enc_seed).context(ErrorKind::Format)?;
+		let mut file = File::create(seed_file_path).context(ErrorKind::IO)?;
+		file.write_all(&enc_seed_json.as_bytes())
+			.context(ErrorKind::IO)?;
+		seed.show_recovery_phrase()?;
+		Ok(seed)
 	}
 
 	pub fn from_file(wallet_config: &WalletConfig, password: &str) -> Result<WalletSeed, Error> {