Update rootdir.rs

Author: Howard20181

native/src/init/rootdir.rs

@@ -47,6 +47,7 @@ on property:init.svc.zygote=stopped
 pub fn inject_custom_rc(mut rc_list: Vec<String>, fd: RawFd, tmp_dir: &Utf8CStr) {
     let mut file = unsafe { File::from_raw_fd(fd) };
     rc_list.iter().for_each(|rc| {
+        // Replace template arguments of rc scripts with dynamic paths
         let rc = rc.replace("${MAGISKTMP}", tmp_dir.as_str());
         write!(file, "\n{}\n", rc).ok();
     });
@@ -76,6 +77,7 @@ impl MagiskInit {
                 .join(overlay)
                 .join("init.rc");
             if init_rc.exists() {
+                // Do not allow overwrite init.rc
                 init_rc.remove().log_ok();
             }
             loop {