feat: returns error code

Cargo.lock

@@ -376,7 +376,7 @@ dependencies = [
 
 [[package]]
 name = "card-cli"
-version = "1.4.0"
+version = "1.4.1"
 dependencies = [
  "authenticator",
  "base64 0.13.0",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "card-cli"
-version = "1.4.0"
+version = "1.4.1"
 authors = ["Hatter Jiang <jht5945@gmail.com>"]
 edition = "2018"
 

src/cmd_chall.rs

@@ -85,6 +85,7 @@ impl Command for CommandImpl {
             }
         } else {
             warning!("YubiKey not found");
+            return Ok(Some(1));
         }
 
         Ok(None)

src/main.rs

@@ -44,8 +44,10 @@ impl DefaultCommandImpl {
 }
 
 fn main() {
-    if let Err(e) = inner_main() {
-        failure_and_exit!("Run cli error: {}", e);
+    match inner_main() {
+        Err(e) => failure_and_exit!("Run cli error: {}", e),
+        Ok(Some(code)) => std::process::exit(code),
+        Ok(None) => (),
     }
 }