Add login process. Remove debugging. Fix order of arguments

programs/init/src/main.rs

@@ -0,0 +1,51 @@
+use std::env;
+use std::fs::File;
+use std::io::{BufRead, BufReader};
+use std::process::Command;
+
+pub fn main() {
+    let file = File::open("initfs:etc/init.rc").expect("failed to open init.rc");
+    let reader = BufReader::new(file);
+
+    for line_result in reader.lines() {
+        let line = line_result.expect("failed to read init.rc");
+        let line = line.trim();
+        if ! line.is_empty() && ! line.starts_with('#') {
+            let mut args = line.split(' ');
+            if let Some(cmd) = args.next() {
+                match cmd {
+                    "echo" => {
+                        if let Some(arg) = args.next() {
+                            print!("{}", arg);
+                        }
+                        for arg in args {
+                            print!(" {}", arg);
+                        }
+                        print!("\n");
+                    },
+                    "cd" => if let Some(dir) = args.next() {
+                        if let Err(err) = env::set_current_dir(dir) {
+                            println!("init: failed to cd to '{}': {}", dir, err);
+                        }
+                    } else {
+                        println!("init: failed to cd: no argument");
+                    },
+                    _ => {
+                        let mut command = Command::new(cmd);
+                        for arg in args {
+                            command.arg(arg);
+                        }
+
+                        match command.spawn() {
+                            Ok(mut child) => match child.wait() {
+                                Ok(_status) => (), //println!("init: waited for {}: {:?}", line, status.code()),
+                                Err(err) => println!("init: failed to wait for '{}': {}", line, err)
+                            },
+                            Err(err) => println!("init: failed to execute '{}': {}", line, err)
+                        }
+                    }
+                }
+            }
+        }
+    }
+}