sysutils: add dummy chroot program

kernel/src/device/mod.rs

@@ -6,10 +6,12 @@ use libk_util::OneTimeInit;
 pub mod bus;
 pub mod clock;
 pub mod display;
-pub mod gpio;
 pub mod power;
 pub mod serial;
 // pub mod timer;
 
+#[cfg(any(rust_analyzer, not(target_arch = "x86_64")))]
+pub mod gpio;
+
 /// Generic machine description string
 pub static MACHINE_NAME: OneTimeInit<String> = OneTimeInit::new();

lib/abi/def/process.abi

@@ -47,6 +47,8 @@ struct SpawnOptions<'a> {
     pub environment: &'a [&'a str],
     /// Working directory
     pub directory: Option<&'a str>,
+    /// Root path
+    pub root: Option<&'a str>,
     /// Optional arguments to specify details of the creation
     pub optional: &'a [SpawnOption],
     /// Extra flags controlling the new process behavior

userspace/sysutils/Cargo.toml

@@ -41,6 +41,10 @@ path = "src/lib.rs"
 name = "mount"
 path = "src/mount.rs"
 
+[[bin]]
+name = "chroot"
+path = "src/chroot.rs"
+
 [[bin]]
 name = "login"
 path = "src/login.rs"

userspace/sysutils/src/chroot.rs

@@ -0,0 +1,23 @@
+use std::process::ExitCode;
+
+fn usage(cmd: &str) {
+    eprintln!("Usage: {cmd} PATH PROGRAM [ARGS...]");
+}
+
+fn main() -> ExitCode {
+    let mut args = std::env::args();
+    let cmd = args.next().unwrap();
+    let Some(path) = args.next() else {
+        usage(&cmd);
+        return ExitCode::FAILURE;
+    };
+    let Some(program) = args.next() else {
+        usage(&cmd);
+        return ExitCode::FAILURE;
+    };
+    let cmd_args = args.collect::<Vec<_>>();
+
+    println!("Run {program:?} at {path:?} with args {cmd_args:?}");
+
+    ExitCode::SUCCESS
+}

xtask/src/build/userspace.rs

@@ -31,6 +31,7 @@ const PROGRAMS: &[(&str, &str)] = &[
     // sysutils
     ("echo", "bin/echo"),
     ("mount", "sbin/mount"),
+    ("chroot", "sbin/chroot"),
     ("login", "sbin/login"),
     ("strace", "bin/strace"),
     ("ls", "bin/ls"),