feat: intermediate process to get exit code and shutdown

Cargo.toml

@@ -3,5 +3,13 @@ name = "maestro-test"
 version = "0.1.0"
 edition = "2021"
 
+[[bin]]
+name = "maestro-test"
+path = "src/main.rs"
+
+[[bin]]
+name = "init"
+path = "src/boot.rs"
+
 [dependencies]
 libc = "0.2.153"

build.sh

@@ -15,6 +15,8 @@ mkfs.ext2 disk
 
 # Fill filesystem
 debugfs -wf - disk <<EOF
+mkdir /dev
 mkdir /sbin
-write target/$TARGET/release/maestro-test /sbin/init
+write target/$TARGET/release/init /sbin/init
+write target/$TARGET/release/maestro-test /sbin/maestro-test
 EOF

src/boot.rs

@@ -0,0 +1,16 @@
+//! Boot stub for integration tests.
+//!
+//! This file exists to run the tests as a second process in order to retrieve the exit code, then shutdown the machine.
+
+use std::process::Command;
+
+pub fn main() {
+    let status = Command::new("/sbin/maestro-test").status().unwrap();
+    let cmd = if status.success() { -1 } else { -2 };
+    // Shutdown
+    unsafe {
+        libc::syscall(libc::SYS_reboot, 0xde145e83u32, 0x40367d6eu32, cmd, 0);
+    }
+    // Loop in case shutdown failed for some reason
+    loop {}
+}