feat(storage): scoped grants (subtree, ro/rw), narrow-only, release revokes all holders; IPC KEEP_DELEGATE opt-in; shell cd/pwd, programs get ro cwd

crates/apps/ls/src/main.rs

@@ -5,7 +5,7 @@
 
 extern crate libkos;
 
-use libkos::fs::Storage;
+use libkos::fs::{FsError, Storage};
 use libkos::println;
 
 /// Where storage's buffer is mapped.
@@ -29,7 +29,9 @@ extern "C" fn main() {
             println!("{:<24} {:>8}", name, e.size);
         }
     });
-    if listed.is_err() {
-        println!("ls: {}: no such directory", dir);
+    match listed {
+        Ok(_) => {}
+        Err(FsError::Denied) => println!("ls: {}: outside what it was given", dir),
+        Err(_) => println!("ls: {}: no such directory", dir),
     }
 }