Add temporary Canyon warning

bin/reth/src/optimism.rs

@@ -8,8 +8,21 @@ compile_error!("Cannot build the `op-reth` binary with the `optimism` feature fl
 
 #[cfg(feature = "optimism")]
 fn main() {
+    print_canyon_warning();
     if let Err(err) = reth::cli::run() {
         eprintln!("Error: {err:?}");
         std::process::exit(1);
     }
 }
+
+#[inline]
+fn print_canyon_warning() {
+    println!("---------------------- [ WARNING! ] ----------------------");
+    println!("`op-reth` does not currently support the Canyon Hardfork,");
+    println!("which went live on 2023-14-11 12PM EST on Sepolia and Goerli.");
+    println!("The node will cease to sync at that blocktime (1699981200).");
+    println!("Please consult the Canyon Hardfork tracking issue to follow");
+    println!("along with the progress of the hardfork implementation:");
+    println!("https://github.com/paradigmxyz/reth/issues/5210");
+    println!("----------------------------------------------------------\n");
+}