features: Add features subcommand

The 'features' subcommand is not publicly documented yet, but it was introduced
in `runc` in opencontainers/runc#3296.

Signed-off-by: Christophe de Dinechin <[email protected]>

crates/liboci-cli/src/features.rs

@@ -0,0 +1,7 @@
+use clap::Parser;
+
+/// Return the features list for a container
+/// This is not a documented subcommand of runc yet, but it was introduced by
+/// https://github.com/opencontainers/runc/pull/3296
+#[derive(Parser, Debug)]
+pub struct Features {}

crates/liboci-cli/src/lib.rs

@@ -17,6 +17,7 @@ pub use {create::Create, delete::Delete, kill::Kill, start::Start, state::State}
 mod checkpoint;
 mod events;
 mod exec;
+mod features;
 mod list;
 mod pause;
 mod ps;
@@ -26,8 +27,8 @@ mod spec;
 mod update;
 
 pub use {
-    checkpoint::Checkpoint, events::Events, exec::Exec, list::List, pause::Pause, ps::Ps,
-    resume::Resume, run::Run, spec::Spec, update::Update,
+    checkpoint::Checkpoint, events::Events, exec::Exec, features::Features, list::List,
+    pause::Pause, ps::Ps, resume::Resume, run::Run, spec::Spec, update::Update,
 };
 
 // Subcommands parsed by liboci-cli, based on the [OCI
@@ -52,6 +53,7 @@ pub enum CommonCmd {
     Checkpointt(Checkpoint),
     Events(Events),
     Exec(Exec),
+    Features(Features),
     List(List),
     Pause(Pause),
     #[clap(allow_hyphen_values = true)]

crates/youki/src/commands/features.rs

@@ -0,0 +1,8 @@
+//! Contains Functionality of `features` container command
+use anyhow::Result;
+use liboci_cli::Features;
+
+/// lists all existing containers
+pub fn features(_: Features) -> Result<()> {
+    Ok(())
+}

crates/youki/src/commands/mod.rs

@@ -13,6 +13,7 @@ pub mod create;
 pub mod delete;
 pub mod events;
 pub mod exec;
+pub mod features;
 pub mod info;
 pub mod kill;
 pub mod list;

crates/youki/src/main.rs

@@ -119,6 +119,7 @@ fn main() -> Result<()> {
                     std::process::exit(-1);
                 }
             },
+            CommonCmd::Features(features) => commands::features::features(features),
             CommonCmd::List(list) => commands::list::list(list, root_path),
             CommonCmd::Pause(pause) => commands::pause::pause(pause, root_path),
             CommonCmd::Ps(ps) => commands::ps::ps(ps, root_path),