fix unused imports

src/main.rs

@@ -1,28 +1,36 @@
+#[cfg(feature = "tracing-mode")]
 use nix::{
-    libc::{c_long, EPERM, ORIG_RAX},
-    sys::stat::Mode,
+    libc::{c_long, ORIG_RAX},
     unistd::{getpid, getppid, Pid},
 };
-use std::io::Write;
-use std::{
-    ffi::{c_void, CString},
-    mem::size_of,
-};
+#[cfg(feature = "tracing-mode")]
+use std::{ffi::c_void, io::Write, mem::size_of};
+
+use nix::{libc::EPERM, sys::stat::Mode};
+use std::ffi::CString;
 
 use clap::*;
 
 use libseccomp::*;
 
-#[derive(clap::Parser, Debug)]
+#[cfg(not(feature = "tracing-mode"))]
+#[derive(Parser, Debug)]
 struct Args {
-    #[cfg(feature = "tracing-mode")]
-    #[clap(short, long)]
-    log_failed_to: Option<String>,
-
     #[clap(required = true)]
     command: Vec<String>,
 }
 
+
+#[cfg(feature = "tracing-mode")]
+#[derive(Parser, Debug)]
+struct Args {
+    #[clap(required = true)]
+    command: Vec<String>,
+    
+    #[clap(short, long)]
+    log_failed_to: Option<String>,
+}
+
 fn main() -> anyhow::Result<()> {
     env_logger::init();
 
@@ -33,7 +41,10 @@ fn main() -> anyhow::Result<()> {
     #[cfg(feature = "tracing-mode")]
     let tracing = args.log_failed_to != None;
 
+    #[cfg(feature = "tracing-mode")]
     let mut default_action = ScmpAction::Errno(EPERM);
+    #[cfg(not(feature = "tracing-mode"))]
+    let default_action = ScmpAction::Errno(EPERM);
 
     #[cfg(feature = "tracing-mode")]
     if let Some(log_fail_to) = args.log_failed_to {