[res] Make TargetResourcesContainer valid after an error

ApkResourcesContainer class has a variant that is either a zip
file object, or a full blown AssetManager with ApkAssets with
the same zip file inside. But if transition from one to the
other fails, it could end up in a state with neither, causing a
crash if the users try accessing it.

This change ensures that:
1. The zip file object is only moved into ApkAssets if the
   loading succeeds

2. If any part of the further initialization of ResState fails,
   we take the zip file out and put it back into the variant

+ Add unit tests for both ApkAssets and libidmap2 to ensure
  they don't crash in any of those scenarios (they used to)

+ Enable root tests in libidmap2 as they were never running

Flag: EXEMPT bugfix
Bug: 381108280
Test: atest libandroidfw_tests idmap2_tests + boot
Change-Id: I8f4803fdf03a41ba7a6892e6aed07f04b77788ce

1 files changed, 13 insertions, 12 deletions

diff --git a/libs/androidfw/ApkAssets.cpp b/libs/androidfw/ApkAssets.cpp
index 49254d1c6f6e..dbb891455ddd 100644
--- a/libs/androidfw/ApkAssets.cpp
+++ b/libs/androidfw/ApkAssets.cpp
@@ -40,20 +40,21 @@ ApkAssets::ApkAssets(PrivateConstructorUtil, std::unique_ptr<Asset> resources_as
 }
 
 ApkAssetsPtr ApkAssets::Load(const std::string& path, package_property_t flags) {
-  return Load(ZipAssetsProvider::Create(path, flags), flags);
+  return LoadImpl(ZipAssetsProvider::Create(path, flags), flags);
 }
 
 ApkAssetsPtr ApkAssets::LoadFromFd(base::unique_fd fd, const std::string& debug_name,
                                    package_property_t flags, off64_t offset, off64_t len) {
-  return Load(ZipAssetsProvider::Create(std::move(fd), debug_name, offset, len), flags);
+  return LoadImpl(ZipAssetsProvider::Create(std::move(fd), debug_name, offset, len), flags);
 }
 
-ApkAssetsPtr ApkAssets::Load(std::unique_ptr<AssetsProvider> assets, package_property_t flags) {
+ApkAssetsPtr ApkAssets::LoadImpl(std::unique_ptr<AssetsProvider>&& assets,
+                                 package_property_t flags) {
   return LoadImpl(std::move(assets), flags, nullptr /* idmap_asset */, nullptr /* loaded_idmap */);
 }
 
-ApkAssetsPtr ApkAssets::LoadTable(std::unique_ptr<Asset> resources_asset,
-                                  std::unique_ptr<AssetsProvider> assets,
+ApkAssetsPtr ApkAssets::LoadTable(std::unique_ptr<Asset>&& resources_asset,
+                                  std::unique_ptr<AssetsProvider>&& assets,
                                   package_property_t flags) {
   if (resources_asset == nullptr) {
     return {};
@@ -97,10 +98,10 @@ ApkAssetsPtr ApkAssets::LoadOverlay(const std::string& idmap_path, package_prope
                   std::move(loaded_idmap));
 }
 
-ApkAssetsPtr ApkAssets::LoadImpl(std::unique_ptr<AssetsProvider> assets,
+ApkAssetsPtr ApkAssets::LoadImpl(std::unique_ptr<AssetsProvider>&& assets,
                                  package_property_t property_flags,
-                                 std::unique_ptr<Asset> idmap_asset,
-                                 std::unique_ptr<LoadedIdmap> loaded_idmap) {
+                                 std::unique_ptr<Asset>&& idmap_asset,
+                                 std::unique_ptr<LoadedIdmap>&& loaded_idmap) {
   if (assets == nullptr) {
     return {};
   }
@@ -119,11 +120,11 @@ ApkAssetsPtr ApkAssets::LoadImpl(std::unique_ptr<AssetsProvider> assets,
                   std::move(idmap_asset), std::move(loaded_idmap));
 }
 
-ApkAssetsPtr ApkAssets::LoadImpl(std::unique_ptr<Asset> resources_asset,
-                                 std::unique_ptr<AssetsProvider> assets,
+ApkAssetsPtr ApkAssets::LoadImpl(std::unique_ptr<Asset>&& resources_asset,
+                                 std::unique_ptr<AssetsProvider>&& assets,
                                  package_property_t property_flags,
-                                 std::unique_ptr<Asset> idmap_asset,
-                                 std::unique_ptr<LoadedIdmap> loaded_idmap) {
+                                 std::unique_ptr<Asset>&& idmap_asset,
+                                 std::unique_ptr<LoadedIdmap>&& loaded_idmap) {
   if (assets == nullptr ) {
     return {};
   }