Added getters to CopyOptions

src/nix/host/mod.rs

@@ -65,6 +65,18 @@ impl CopyOptions {
         self.gzip = val;
         self
     }
+
+    pub fn get_include_outputs(&self) -> bool {
+        self.include_outputs
+    }
+
+    pub fn get_use_substitutes(&self) -> bool {
+        self.use_substitutes
+    }
+
+    pub fn get_gzip(&self) -> bool {
+        self.gzip
+    }
 }
 
 impl Default for RebootOptions {