add cg ls, prepare for rc subcommands

src/bin/dkl.rs

@@ -3,6 +3,7 @@ use eyre::{format_err, Result};
 use human_units::Duration;
 use log::{debug, error};
 use std::net::SocketAddr;
+use std::path::PathBuf;
 use tokio::fs;
 
 #[derive(Parser)]
@@ -81,6 +82,21 @@ enum Command {
         #[arg(long, default_value = "5s")]
         timeout: Duration,
     },
+
+    Cg {
+        #[command(subcommand)]
+        cmd: CgCmd,
+    },
+}
+
+#[derive(Subcommand)]
+enum CgCmd {
+    Ls {
+        #[arg(long)]
+        root: Option<PathBuf>,
+        #[arg(long, short = 'X')]
+        exclude: Vec<String>,
+    },
 }
 
 #[tokio::main(flavor = "current_thread")]
@@ -157,6 +173,10 @@ async fn main() -> Result<()> {
         .run()
         .await
         .map(|_| ())?),
+
+        C::Cg { cmd } => match cmd {
+            CgCmd::Ls { root, exclude } => Ok(dkl::cgroup::ls(root, &exclude).await?),
+        },
     }
 }