Add quiet mode for now

cli/src/main.rs

@@ -163,6 +163,11 @@ fn install_tracing_subscriber(opts: &Opts) {
             }
         }
     }
+    // If the quiet flag is passed in, don't log anything (this should maybe
+    // just be a verbosity setting)
+    if opts.quiet() {
+        env::set_var("RUST_LOG", "viceroy=off,viceroy-lib=off");
+    }
     // Build a subscriber, using the default `RUST_LOG` environment variable for our filter.
     let builder = FmtSubscriber::builder()
         .with_writer(StdWriter::new())

cli/src/opts.rs

@@ -47,6 +47,8 @@ pub struct Opts {
     // Whether to enable wasmtime's builtin profiler.
     #[arg(long = "profiler", value_parser = check_wasmtime_profiler_mode)]
     profiler: Option<ProfilingStrategy>,
+    #[arg(short = 'q', long = "quiet", default_value = "false")]
+    quiet: bool,
     // Command line to start child process
     #[arg(trailing_var_arg = true, allow_hyphen_values = true)]
     run: Vec<String>,
@@ -99,6 +101,10 @@ impl Opts {
     pub fn run(&self) -> &[String] {
         self.run.as_ref()
     }
+
+    pub fn quiet(&self) -> bool {
+        self.quiet
+    }
 }
 
 /// A parsing function used by [`Opts`][opts] to check that the input is a valid Wasm module in