feat(cli): basic argument handling

src/fs-gen/Cargo.toml

@@ -6,3 +6,4 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+clap = { version = "4.5.3", features = ["derive", "wrap_help", "string"] }

src/fs-gen/src/cli_args.rs

@@ -0,0 +1,23 @@
+use std::{env, path::PathBuf};
+
+use clap::{command, Parser};
+/// Convert an OCI image into a CPIO file
+#[derive(Parser, Debug)]
+#[command(version, about, long_about = None)]
+pub struct CliArgs {
+    /// The name of the image to download
+    #[arg(short, long)]
+    pub image_name: String,
+
+    /// The path to the output file
+    #[arg(short, long, default_value=get_default_log_path().into_os_string())]
+    pub ouput_file: PathBuf,
+}
+
+/// Get the default output path for the cpio file.
+fn get_default_log_path() -> PathBuf {
+    let mut path = env::current_exe().unwrap();
+    path.pop();
+    path.push("output.cpio");
+    path
+}

src/fs-gen/src/main.rs

@@ -1,3 +1,10 @@
+use clap::Parser;
+
+use crate::cli_args::CliArgs;
+
+mod cli_args;
+
 fn main() {
-    println!("Hello, world!");
+    let args = CliArgs::parse();
+    println!("Hello, world!, {:?}", args);
 }