ksud: Add cli for fast copy sparse file

userspace/ksud/src/cli.rs

@@ -112,6 +112,13 @@ enum Debug {
 
     Mount,
 
+    /// Copy sparse file
+    Xcp {
+        /// source file
+        src: String,
+        /// destination file
+        dst: String,
+    },
     /// For testing
     Test,
 }
@@ -277,6 +284,10 @@ pub fn run() -> Result<()> {
             }
             Debug::Su => crate::ksu::grant_root(),
             Debug::Mount => event::mount_systemlessly(defs::MODULE_DIR),
+            Debug::Xcp { src, dst } => {
+                utils::copy_sparse_file(&src, &dst)?;
+                Ok(())
+            }
             Debug::Test => todo!(),
         },