Keep iPhone TOTP cache across installs (#78)

crates/storage/src/mobile_totp.rs

@@ -348,7 +348,7 @@ impl<'a> MobileTotpService<'a> {
             progress.total = u32::try_from(initial_inventory.len()).unwrap_or(u32::MAX);
         });
 
-        let store = store_identity(self.repository.root_path());
+        let store = store_identity(self.repository.root_path(), cache_path);
         let (cached, mut cache_notice) = load_cache(cache_path, &store);
         let mut records = BTreeMap::new();
         let mut rows = Vec::new();
@@ -424,7 +424,7 @@ impl<'a> MobileTotpService<'a> {
         shared: &BTreeSet<EntryPath>,
         cache_path: &Path,
     ) -> Option<MobileTotpPage> {
-        let store = store_identity(self.repository.root_path());
+        let store = store_identity(self.repository.root_path(), cache_path);
         let (catalog, _) = load_cache(cache_path, &store);
         let mut rows: Vec<_> = catalog?
             .entries
@@ -460,7 +460,7 @@ impl<'a> MobileTotpService<'a> {
             ciphertext_hash: digest(ciphertext.as_bytes()),
             is_totp: uri.is_some(),
         };
-        let store = store_identity(self.repository.root_path());
+        let store = store_identity(self.repository.root_path(), cache_path);
         let cache_notice =
             upsert_cache_record(cache_path, &store, document.path().to_string(), record);
         let detail = match (uri, unix_seconds) {
@@ -667,8 +667,15 @@ fn set_private_permissions(_temporary: &TempFile<'_>) -> Result<(), MobileTotpCa
     Ok(())
 }
 
-fn store_identity(root: &Path) -> String {
+fn store_identity(root: &Path, cache_path: &Path) -> String {
-    digest(root.to_string_lossy().as_bytes())
+    let cache_parent = cache_path
+        .parent()
+        .and_then(|parent| fs::canonicalize(parent).ok());
+    let stable_root = cache_parent
+        .as_deref()
+        .and_then(|parent| root.strip_prefix(parent).ok())
+        .unwrap_or(root);
+    digest(stable_root.to_string_lossy().as_bytes())
 }
 
 fn digest(bytes: &[u8]) -> String {

crates/storage/tests/mobile_totp.rs

@@ -306,6 +306,47 @@ fn totp_cache_reuses_ciphertext_hashes_and_removes_deleted_entries() -> TestResu
     Ok(())
 }
 
+#[test]
+fn totp_cache_survives_application_container_relocation() -> TestResult {
+    let fixture = FixtureSet::load()?;
+    let application = tempfile::tempdir()?;
+    let installed = application.path().join("installed");
+    fs::create_dir(&installed)?;
+    let vault = installed.join("vault");
+    fs::rename(fixture.materialize_store("basic")?.keep(), &vault)?;
+    let cache = installed.join("totp-catalog.toml");
+    let keys = KeyStore::load(fixture.path("keys"))?;
+    let expected = {
+        let repository = Repository::open(&vault)?;
+        let service = MobileTotpService::new(&repository, &keys);
+        let operation = MobileTotpOperation::default();
+        let mut secrets = CountingSecrets::all(&fixture);
+        service.discover(&BTreeSet::new(), &mut secrets, &cache, &operation)?
+    };
+
+    let updated = application.path().join("updated");
+    fs::rename(&installed, &updated)?;
+    let repository = Repository::open(updated.join("vault"))?;
+    let service = MobileTotpService::new(&repository, &keys);
+    let relocated_cache = updated.join("totp-catalog.toml");
+    assert_eq!(
+        service
+            .cached_page(&BTreeSet::new(), &relocated_cache)
+            .expect("relocated cache remains valid")
+            .rows(),
+        expected.rows()
+    );
+    let operation = MobileTotpOperation::default();
+    let mut secrets = CountingSecrets::all(&fixture);
+    service.discover(&BTreeSet::new(), &mut secrets, &relocated_cache, &operation)?;
+    assert_eq!(secrets.requests, 0);
+    assert_eq!(
+        operation.progress().cache_hits(),
+        operation.progress().total()
+    );
+    Ok(())
+}
+
 #[test]
 fn decrypted_entry_details_reconcile_totp_cache_without_persisting_secrets() -> TestResult {
     let fixture = FixtureSet::load()?;