feat(xen): garbage collect loader/entries

rust/tool/systemd/src/install.rs

@@ -99,12 +99,12 @@ impl Installer {
 
         if self.broken_gens.is_empty() {
             log::info!("Collecting garbage...");
-            // Only collect garbage in these two directories. This way, no files that do not belong to
+            // Only collect garbage in these directories. This way, no files that do not belong to
             // the NixOS installation are deleted. Lanzatool takes full control over the esp/EFI/nixos
             // directory and deletes ALL files that it doesn't know about. Dual- or multiboot setups
             // that need files in this directory will NOT work.
             self.gc_roots.collect_garbage(&self.esp_paths.nixos)?;
-            // The esp/EFI/Linux directory is assumed to be potentially shared with other distros.
+            // The esp/EFI/Linux and loader/entries directories are assumed to be potentially shared with other distros.
             // Thus, only files that start with "nixos-" are garbage collected (i.e. potentially
             // deleted).
             self.gc_roots
@@ -113,6 +113,12 @@ impl Installer {
                         .and_then(|n| n.to_str())
                         .map_or(false, |n| n.starts_with("nixos-"))
                 })?;
+            self.gc_roots
+                .collect_garbage_with_filter(&self.esp_paths.entries, |p| {
+                    p.file_name()
+                        .and_then(|n| n.to_str())
+                        .map_or(false, |n| n.starts_with("nixos-"))
+                })?;
         } else {
             // This might produce a ridiculous message if you have a lot of malformed generations.
             let warning = indoc::formatdoc! {"