cloud-hypervisor: Application handling

We will only support a --kernel option for now.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

src/main.rs

@@ -1,3 +1,32 @@
+// Copyright © 2019 Intel Corporation
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+
+#[macro_use(crate_version, crate_authors)]
+extern crate clap;
+
+use clap::{App, Arg};
+
+use std::path::PathBuf;
+
 fn main() {
-    println!("Hello, world!");
+    let cmd_arguments = App::new("cloud-hypervisor")
+        .version(crate_version!())
+        .author(crate_authors!())
+        .about("Launch a cloud-hypervisor VMM.")
+        .arg(
+            Arg::with_name("kernel")
+                .long("kernel")
+                .help("Path to kernel image (vmlinux)")
+                .takes_value(true),
+        )
+        .get_matches();
+
+    let kernel_path = cmd_arguments
+        .value_of("kernel")
+        .map(PathBuf::from)
+        .expect("Missing argument: kernel");
+
+    println!("Booting {:?}...", kernel_path.as_path());
 }