apt: refactor into multiple modules

src/deb/local.rs

@@ -31,7 +31,7 @@ pub fn build(
     }
 
     // UBUNTU: Ensure 'universe' repository is enabled
-    let mut sources = apt::load(None)?;
+    let mut sources = apt::sources::load(None)?;
     let mut modified = false;
     for source in &mut sources {
         if source.uri.contains("ubuntu") && !source.components.contains(&"universe".to_string()) {
@@ -40,7 +40,7 @@ pub fn build(
         }
     }
     if modified {
-        apt::save_legacy(None, sources, "/etc/apt/sources.list")?;
+        apt::sources::save_legacy(None, sources, "/etc/apt/sources.list")?;
     }
 
     // Update package lists