1 files changed, 32 insertions, 0 deletions
diff --git a/tests/rootfs_finalization.rs b/tests/rootfs_finalization.rs
index 3a98290..a450b7e 100644
--- a/tests/rootfs_finalization.rs
+++ b/tests/rootfs_finalization.rs
@@ -115,3 +115,35 @@ fn finalization_is_idempotent_for_matching_symlinks() {
         .iter()
         .any(|path| path == "etc/controller/controller-link"));
 }
+
+#[test]
+fn finalization_replaces_a_destination_symlink_instead_of_following_it() {
+    let fixture = tempdir().expect("fixture directory");
+    let source = fixture.path().join("overlay");
+    fs::create_dir_all(&source).expect("create source tree");
+    fs::write(source.join("controller.conf"), "new controller configuration\n")
+        .expect("write source file");
+    let rootfs = tempdir().expect("rootfs directory");
+    let outside = fixture.path().join("outside.conf");
+    fs::write(&outside, "must not change\n").expect("write outside file");
+    fs::create_dir_all(rootfs.path().join("etc/controller")).expect("create destination directory");
+    symlink(&outside, rootfs.path().join("etc/controller/controller.conf"))
+        .expect("create destination symlink");
+    let finalization = RootfsFinalization::new(
+        vec![CopyTree::new(&source, "etc/controller").expect("valid copy destination")],
+        InitrdOem::new(std::iter::empty::<&str>(), std::iter::empty::<&str>()),
+        vec![],
+    );
+
+    finalization.apply(rootfs.path()).expect("finalization replaces symlink safely");
+
+    assert_eq!(fs::read_to_string(&outside).expect("read outside file"), "must not change\n");
+    assert!(fs::symlink_metadata(rootfs.path().join("etc/controller/controller.conf"))
+        .expect("inspect copied file")
+        .file_type()
+        .is_file());
+    assert_eq!(
+        fs::read_to_string(rootfs.path().join("etc/controller/controller.conf")).expect("read copied file"),
+        "new controller configuration\n"
+    );
+}