From 434fc29ab867d630185b632a43e82513ac918fe5 Mon Sep 17 00:00:00 2001
From: Hermes Agent <hermes@localhost>
Date: Wed, 12 Aug 2026 03:27:18 +0000
Subject: Preserve hardlinks in native tar archives

---
 tests/archive.rs | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

(limited to 'tests')

diff --git a/tests/archive.rs b/tests/archive.rs
index 3956849..e31b65a 100644
--- a/tests/archive.rs
+++ b/tests/archive.rs
@@ -47,6 +47,56 @@ fn writes_deterministic_tar_with_files_directories_and_symlinks() {
     );
 }
 
+#[test]
+fn preserves_hardlinks_in_the_archive() {
+    use std::os::unix::fs::MetadataExt;
+
+    let fixture = tempdir().expect("fixture directory");
+    let rootfs = fixture.path().join("rootfs");
+    fs::create_dir_all(rootfs.join("usr/bin")).expect("create rootfs tree");
+    let original = rootfs.join("usr/bin/controller");
+    let alias = rootfs.join("usr/bin/controller-link");
+    fs::write(&original, "controller\n").expect("write controller");
+    fs::hard_link(&original, &alias).expect("create hardlink");
+    assert_eq!(
+        fs::metadata(&original).expect("stat original").ino(),
+        fs::metadata(&alias).expect("stat alias").ino()
+    );
+
+    let artifact = fixture.path().join("controller.tar");
+    NativeTarWriter::new()
+        .write(&rootfs, &artifact)
+        .expect("write archive");
+
+    let mut archive = Archive::new(fs::File::open(artifact).expect("open archive"));
+    let entries = archive
+        .entries()
+        .expect("read archive entries")
+        .map(|entry| {
+            let entry = entry.expect("read entry");
+            (
+                entry.path().expect("entry path").into_owned(),
+                entry.header().entry_type(),
+                entry.link_name().expect("entry link name").map(|path| path.into_owned()),
+            )
+        })
+        .collect::<Vec<_>>();
+
+    assert_eq!(
+        entries,
+        vec![
+            ("usr".into(), tar::EntryType::Directory, None),
+            ("usr/bin".into(), tar::EntryType::Directory, None),
+            ("usr/bin/controller".into(), tar::EntryType::Regular, None),
+            (
+                "usr/bin/controller-link".into(),
+                tar::EntryType::Link,
+                Some("usr/bin/controller".into())
+            ),
+        ]
+    );
+}
+
 #[test]
 fn rejects_a_missing_rootfs() {
     let fixture = tempdir().expect("fixture directory");
-- 
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