runk: merge oci-kata-agent into runk

Merge two bins into one.

Fixes: #4291

Signed-off-by: Tim Zhang <tim@hyper.sh>

src/agent/rustjail/src/container.rs

@@ -78,9 +78,6 @@ const HOME_ENV_KEY: &str = "HOME";
 const PIDNS_FD: &str = "PIDNS_FD";
 const CONSOLE_SOCKET_FD: &str = "CONSOLE_SOCKET_FD";
 
-#[cfg(feature = "standard-oci-runtime")]
-const OCI_AGENT_BINARY: &str = "oci-kata-agent";
-
 #[derive(Debug)]
 pub struct ContainerStatus {
     pre_status: ContainerState,
@@ -951,15 +948,7 @@ impl BaseContainer for LinuxContainer {
             let _ = unistd::close(pid);
         });
 
-        cfg_if::cfg_if! {
-            if #[cfg(feature = "standard-oci-runtime")] {
-                let exec_path = PathBuf::from(OCI_AGENT_BINARY);
-            }
-            else {
-                let exec_path = std::env::current_exe()?;
-            }
-        }
-
+        let exec_path = std::env::current_exe()?;
         let mut child = std::process::Command::new(exec_path);
 
         #[allow(unused_mut)]

src/tools/runk/Makefile

@@ -8,30 +8,16 @@ include ../../../utils.mk
 TARGET = runk
 TARGET_PATH = target/$(TRIPLE)/$(BUILD_TYPE)/$(TARGET)
 
-AGENT_TARGET = oci-kata-agent
-AGENT_TARGET_PATH = target/$(TRIPLE)/$(BUILD_TYPE)/$(AGENT_TARGET)
-AGENT_SOURCE_PATH = ../../agent
-
 # BINDIR is a directory for installing executable programs
 BINDIR := /usr/local/bin
 
 .DEFAULT_GOAL := default
 default: build
 
-build: build-agent build-runk
-
-build-agent:
-	make -C $(AGENT_SOURCE_PATH) STANDARD_OCI_RUNTIME=yes
-
-build-runk:
+build:
 	@RUSTFLAGS="$(EXTRA_RUSTFLAGS) --deny warnings" cargo build --target $(TRIPLE) --$(BUILD_TYPE)
 
-install: install-agent install-runk
-
-install-agent:
-	install -D $(AGENT_SOURCE_PATH)/$(AGENT_TARGET_PATH) $(BINDIR)/$(AGENT_TARGET)
-
-install-runk:
+install:
 	install -D $(TARGET_PATH) $(BINDIR)/$(TARGET)
 
 clean:
@@ -47,11 +33,7 @@ check: standard_rust_check
 
 .PHONY: \
 	build \
-	build-agent \
-	build-runk \
 	install \
-	install-agent \
-	install-runk \
 	clean \
 	clippy \
 	format \

src/tools/runk/README.md

@@ -60,18 +60,14 @@ are welcome.
 Regarding features compared to `runc`, see the `Status of runk` section in the [issue](https://github.com/kata-containers/kata-containers/issues/2784).
 
 ## Building
-
-`runk` uses the modified the `kata-agent` binary, `oci-kata-agent`, which is an agent to be called from `runk`.
-Therefore, you also need to build the `oci-kata-agent` to run `runk`.
-
-You can build both `runk` and `oci-kata-agent` as follows.
+You can build `runk` as follows.
 
 ```bash
 $ cd runk
 $ make
 ```
 
-To install `runk` and `oci-kata-agent` into default directory for install executable program (`/usr/local/bin`):
+To install `runk` into default directory for install executable program (`/usr/local/bin`):
 
 ```bash
 $ sudo make install

src/tools/runk/src/main.rs

@@ -28,6 +28,7 @@ enum SubCommand {
     Common(CommonCmd),
     #[clap(flatten)]
     Custom(CustomCmd),
+    Init {},
 }
 
 // Copy from https://github.com/containers/youki/blob/v0.0.3/crates/liboci-cli/src/lib.rs#L38-L44
@@ -84,6 +85,7 @@ async fn cmd_run(subcmd: SubCommand, root_path: &Path, logger: &Logger) -> Resul
         SubCommand::Custom(cmd) => match cmd {
             CustomCmd::Kill(kill) => commands::kill::run(kill, root_path, logger),
         },
+        _ => unreachable!(),
     }
 }
 
@@ -113,6 +115,11 @@ fn setup_logger(
 async fn real_main() -> Result<()> {
     let cli = Cli::parse();
 
+    if let SubCommand::Init {} = cli.subcmd {
+        rustjail::container::init_child();
+        exit(0);
+    }
+
     let root_path = if let Some(path) = cli.global.root {
         path
     } else {