Don't include a new line character in a password

Author: kseo

codechain/main.rs

@@ -209,8 +209,12 @@ fn new_miner(config: &config::Config, spec: &Spec, ap: Arc<AccountProvider>) ->
                 Ok(..) => match config.mining.password_path {
                     None => return Err("mining.password_path is not specified".to_string()),
                     Some(ref password_path) => match fs::read_to_string(password_path) {
-                        Ok(password) => {
-                            miner.set_engine_signer(engine_signer, password).map_err(|e| format!("{:?}", e))?
+                        Ok(content) => {
+                            // Read the first line as password.
+                            let password = content.lines().next().ok_or("Password file is empty")?;
+                            miner
+                                .set_engine_signer(engine_signer, password.to_string())
+                                .map_err(|e| format!("{:?}", e))?
                         }
                         Err(_) => return Err(format!("Failed to read the password file")),
                     },