feat: add reth config cmd to dump default reth.toml (#2167)

bin/reth/Cargo.toml

@@ -51,6 +51,7 @@ serde_json = "1.0"
 shellexpand = "3.0.0"
 dirs-next = "2.0.0"
 confy = "0.5"
+toml = {version = "0.7", features = ["display"]}
 
 # metrics
 metrics = "0.20.1"

bin/reth/src/cli.rs

@@ -2,7 +2,7 @@
 use std::str::FromStr;
 
 use crate::{
-    chain, db,
+    chain, config, db,
     dirs::{LogsDir, PlatformPath},
     drop_stage, dump_stage, node, p2p,
     runner::CliRunner,
@@ -35,6 +35,7 @@ pub fn run() -> eyre::Result<()> {
         Commands::P2P(command) => runner.run_until_ctrl_c(command.execute()),
         Commands::TestVectors(command) => runner.run_until_ctrl_c(command.execute()),
         Commands::TestEthChain(command) => runner.run_until_ctrl_c(command.execute()),
+        Commands::Config(command) => runner.run_until_ctrl_c(command.execute()),
     }
 }
 
@@ -76,6 +77,9 @@ pub enum Commands {
     /// Generate Test Vectors
     #[command(name = "test-vectors")]
     TestVectors(test_vectors::Command),
+    /// Write config to stdout
+    #[command(name = "config")]
+    Config(config::Command),
 }
 
 #[derive(Debug, Parser)]

bin/reth/src/config.rs

@@ -0,0 +1,38 @@
+//! CLI command to show configs
+use clap::Parser;
+use eyre::{bail, WrapErr};
+use reth_staged_sync::Config;
+
+use crate::dirs::{ConfigPath, PlatformPath};
+
+/// `reth config` command
+#[derive(Debug, Parser)]
+pub struct Command {
+    /// The path to the configuration file to use.
+    #[arg(long, value_name = "FILE", verbatim_doc_comment)]
+    config: Option<PlatformPath<ConfigPath>>,
+
+    /// Show the default config
+    #[arg(long, verbatim_doc_comment, conflicts_with = "config")]
+    default: bool,
+}
+
+impl Command {
+    /// Execute `config` command
+    pub async fn execute(&self) -> eyre::Result<()> {
+        let config = if self.default {
+            Config::default()
+        } else {
+            let path = self.config.clone().unwrap_or_default();
+            // confy will create the file if it doesn't exist; we don't want this
+            if !path.as_ref().exists() {
+                bail!("Config file does not exist: {}", path.as_ref().display());
+            }
+            confy::load_path::<Config>(path.as_ref()).wrap_err_with(|| {
+                format!("Could not load config file: {}", path.as_ref().display())
+            })?
+        };
+        println!("{}", toml::to_string_pretty(&config)?);
+        Ok(())
+    }
+}

bin/reth/src/lib.rs

@@ -10,6 +10,7 @@
 pub mod args;
 pub mod chain;
 pub mod cli;
+pub mod config;
 pub mod db;
 pub mod dirs;
 pub mod drop_stage;