diff --git a/core/OWNERS b/core/OWNERS
index 36951a9..1c3d017 100644
--- a/core/OWNERS
+++ b/core/OWNERS
@@ -10,3 +10,6 @@
 
 # For Ravenwood test configs
 per-file ravenwood_test_config_template.xml = jsharkey@google.com,omakoto@google.com
+
+# For binary_translation
+per-file berberis_test.mk = levarum@google.com,khim@google.com,dimitry@google.com
diff --git a/core/product_config.mk b/core/product_config.mk
index fae2c1a..4eeac95 100644
--- a/core/product_config.mk
+++ b/core/product_config.mk
@@ -569,20 +569,27 @@
       $(PRODUCT_ENFORCE_RRO_EXEMPTED_TARGETS))
 endif
 
-# Get the board API level.
-board_api_level := $(PLATFORM_SDK_VERSION)
-ifdef BOARD_API_LEVEL
-  board_api_level := $(BOARD_API_LEVEL)
-else ifdef BOARD_SHIPPING_API_LEVEL
-  # Vendors with GRF must define BOARD_SHIPPING_API_LEVEL for the vendor API level.
-  board_api_level := $(BOARD_SHIPPING_API_LEVEL)
-endif
+# This table maps sdk version 35 to vendor api level 202404 and assumes yearly
+# release for the same month.
+define sdk-to-vendor-api-level
+  $(if $(call math_lt_or_eq,$(1),34),$(1),20$(call int_subtract,$(1),11)04)
+endef
 
-# Calculate the VSR vendor API level.
-VSR_VENDOR_API_LEVEL := $(board_api_level)
-
-ifdef PRODUCT_SHIPPING_API_LEVEL
-  VSR_VENDOR_API_LEVEL := $(call math_min,$(PRODUCT_SHIPPING_API_LEVEL),$(board_api_level))
+ifdef PRODUCT_SHIPPING_VENDOR_API_LEVEL
+# Follow the version that is set manually.
+  VSR_VENDOR_API_LEVEL := $(PRODUCT_SHIPPING_VENDOR_API_LEVEL)
+else
+  # VSR API level is the vendor api level of the product shipping API level.
+  VSR_VENDOR_API_LEVEL := $(call sdk-to-vendor-api-level,$(PLATFORM_SDK_VERSION))
+  ifdef PRODUCT_SHIPPING_API_LEVEL
+    VSR_VENDOR_API_LEVEL := $(call sdk-to-vendor-api-level,$(PRODUCT_SHIPPING_API_LEVEL))
+  endif
+  ifdef BOARD_SHIPPING_API_LEVEL
+    # Vendors with GRF must define BOARD_SHIPPING_API_LEVEL for the vendor API level.
+    # In this case, the VSR API level is the minimum of the PRODUCT_SHIPPING_API_LEVEL
+    # and RELEASE_BOARD_API_LEVEL
+    VSR_VENDOR_API_LEVEL := $(call math_min,$(VSR_VENDOR_API_LEVEL),$(RELEASE_BOARD_API_LEVEL))
+  endif
 endif
 .KATI_READONLY := VSR_VENDOR_API_LEVEL
 
@@ -597,7 +604,7 @@
 
 # Boolean variable determining if selinux labels of /dev are enforced
 CHECK_DEV_TYPE_VIOLATIONS := false
-ifneq ($(call math_gt,$(VSR_VENDOR_API_LEVEL),35),)
+ifneq ($(call math_gt,$(VSR_VENDOR_API_LEVEL),202404),)
   CHECK_DEV_TYPE_VIOLATIONS := true
 else ifneq ($(PRODUCT_CHECK_DEV_TYPE_VIOLATIONS),)
   CHECK_DEV_TYPE_VIOLATIONS := $(PRODUCT_CHECK_DEV_TYPE_VIOLATIONS)
diff --git a/core/tasks/berberis_test.mk b/core/tasks/berberis_test.mk
new file mode 100644
index 0000000..8604709
--- /dev/null
+++ b/core/tasks/berberis_test.mk
@@ -0,0 +1,25 @@
+#
+# Copyright (C) 2023 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+BERBERIS_DIR := frameworks/libs/binary_translation
+
+# Berberis includes some components which may conflict with other packages.
+# Only build it when requested explicitly.
+ifeq ($(BUILD_BERBERIS),true)
+
+include $(BERBERIS_DIR)/tests/run_host_tests.mk
+
+endif  # BUILD_BERBERIS
diff --git a/target/product/sdk.mk b/target/product/sdk.mk
index 04649a2..1a07363 100644
--- a/target/product/sdk.mk
+++ b/target/product/sdk.mk
@@ -34,6 +34,9 @@
 
 PRODUCT_BUILD_FROM_SOURCE_STUB := true
 
+# Use sources of mainline modules
+PRODUCT_MODULE_BUILD_FROM_SOURCE := true
+
 ifeq ($(WITHOUT_CHECK_API),true)
   $(error WITHOUT_CHECK_API cannot be set to true for SDK product builds)
 endif
diff --git a/tools/aconfig/TEST_MAPPING b/tools/aconfig/TEST_MAPPING
index 7651dba..638b92a 100644
--- a/tools/aconfig/TEST_MAPPING
+++ b/tools/aconfig/TEST_MAPPING
@@ -39,6 +39,10 @@
     //   "name": "aconfig.exported_mode.test.rust"
     // },
     {
+      // aflags CLI unit tests
+      "name": "aflags.test"
+    },
+    {
       // printflags unit tests
       "name": "printflags.test"
     },
@@ -66,9 +70,7 @@
       // test testing filtering logic. Breakage on this test means all tests
       // that using the flag macros to do filtering will get affected.
       "name": "FlagMacrosTests"
-    }
-  ],
-  "postsubmit": [
+    },
     {
       // aconfig_storage_write_api unit tests
       "name": "aconfig_storage_write_api.test"
@@ -82,21 +84,18 @@
       "name": "aconfig_storage_write_api.test.rust"
     },
     {
-      // aconfig_storage write api cpp integration tests
-      "name": "aconfig_storage_write_api.test.cpp"
-    },
-    {
       // aconfig_storage read api rust integration tests
       "name": "aconfig_storage_read_api.test.rust"
     },
     {
       // aconfig_storage read api cpp integration tests
       "name": "aconfig_storage_read_api.test.cpp"
-    },
+    }
+  ],
+  "postsubmit": [
     {
-      // aflags CLI unit tests
-      // TODO(b/326062088): add to presubmit once proven in postsubmit.
-      "name": "aflags.test"
+      // aconfig_storage write api cpp integration tests
+      "name": "aconfig_storage_write_api.test.cpp"
     }
   ]
 }
diff --git a/tools/aconfig/aconfig/src/codegen/java.rs b/tools/aconfig/aconfig/src/codegen/java.rs
index fab2fa3..920d5fa 100644
--- a/tools/aconfig/aconfig/src/codegen/java.rs
+++ b/tools/aconfig/aconfig/src/codegen/java.rs
@@ -180,27 +180,36 @@
     import android.compat.annotation.UnsupportedAppUsage;
     /** @hide */
     public interface FeatureFlags {
+        @com.android.aconfig.annotations.AconfigFlagAccessor
         @com.android.aconfig.annotations.AssumeFalseForR8
         @UnsupportedAppUsage
         boolean disabledRo();
+        @com.android.aconfig.annotations.AconfigFlagAccessor
         @UnsupportedAppUsage
         boolean disabledRw();
+        @com.android.aconfig.annotations.AconfigFlagAccessor
         @UnsupportedAppUsage
         boolean disabledRwExported();
+        @com.android.aconfig.annotations.AconfigFlagAccessor
         @UnsupportedAppUsage
         boolean disabledRwInOtherNamespace();
+        @com.android.aconfig.annotations.AconfigFlagAccessor
         @com.android.aconfig.annotations.AssumeTrueForR8
         @UnsupportedAppUsage
         boolean enabledFixedRo();
+        @com.android.aconfig.annotations.AconfigFlagAccessor
         @com.android.aconfig.annotations.AssumeTrueForR8
         @UnsupportedAppUsage
         boolean enabledFixedRoExported();
+        @com.android.aconfig.annotations.AconfigFlagAccessor
         @com.android.aconfig.annotations.AssumeTrueForR8
         @UnsupportedAppUsage
         boolean enabledRo();
+        @com.android.aconfig.annotations.AconfigFlagAccessor
         @com.android.aconfig.annotations.AssumeTrueForR8
         @UnsupportedAppUsage
         boolean enabledRoExported();
+        @com.android.aconfig.annotations.AconfigFlagAccessor
         @UnsupportedAppUsage
         boolean enabledRw();
     }
@@ -231,43 +240,52 @@
         /** @hide */
         public static final String FLAG_ENABLED_RW = "com.android.aconfig.test.enabled_rw";
 
+        @com.android.aconfig.annotations.AconfigFlagAccessor
         @com.android.aconfig.annotations.AssumeFalseForR8
         @UnsupportedAppUsage
         public static boolean disabledRo() {
             return FEATURE_FLAGS.disabledRo();
         }
+        @com.android.aconfig.annotations.AconfigFlagAccessor
         @UnsupportedAppUsage
         public static boolean disabledRw() {
             return FEATURE_FLAGS.disabledRw();
         }
+        @com.android.aconfig.annotations.AconfigFlagAccessor
         @UnsupportedAppUsage
         public static boolean disabledRwExported() {
             return FEATURE_FLAGS.disabledRwExported();
         }
+        @com.android.aconfig.annotations.AconfigFlagAccessor
         @UnsupportedAppUsage
         public static boolean disabledRwInOtherNamespace() {
             return FEATURE_FLAGS.disabledRwInOtherNamespace();
         }
+        @com.android.aconfig.annotations.AconfigFlagAccessor
         @com.android.aconfig.annotations.AssumeTrueForR8
         @UnsupportedAppUsage
         public static boolean enabledFixedRo() {
             return FEATURE_FLAGS.enabledFixedRo();
         }
+        @com.android.aconfig.annotations.AconfigFlagAccessor
         @com.android.aconfig.annotations.AssumeTrueForR8
         @UnsupportedAppUsage
         public static boolean enabledFixedRoExported() {
             return FEATURE_FLAGS.enabledFixedRoExported();
         }
+        @com.android.aconfig.annotations.AconfigFlagAccessor
         @com.android.aconfig.annotations.AssumeTrueForR8
         @UnsupportedAppUsage
         public static boolean enabledRo() {
             return FEATURE_FLAGS.enabledRo();
         }
+        @com.android.aconfig.annotations.AconfigFlagAccessor
         @com.android.aconfig.annotations.AssumeTrueForR8
         @UnsupportedAppUsage
         public static boolean enabledRoExported() {
             return FEATURE_FLAGS.enabledRoExported();
         }
+        @com.android.aconfig.annotations.AconfigFlagAccessor
         @UnsupportedAppUsage
         public static boolean enabledRw() {
             return FEATURE_FLAGS.enabledRw();
@@ -458,12 +476,13 @@
                 other_namespace_is_cached = true;
             }
 
-
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @Override
             @UnsupportedAppUsage
             public boolean disabledRo() {
                 return false;
             }
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @Override
             @UnsupportedAppUsage
             public boolean disabledRw() {
@@ -472,6 +491,7 @@
                 }
                 return disabledRw;
             }
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @Override
             @UnsupportedAppUsage
             public boolean disabledRwExported() {
@@ -480,6 +500,7 @@
                 }
                 return disabledRwExported;
             }
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @Override
             @UnsupportedAppUsage
             public boolean disabledRwInOtherNamespace() {
@@ -488,26 +509,31 @@
                 }
                 return disabledRwInOtherNamespace;
             }
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @Override
             @UnsupportedAppUsage
             public boolean enabledFixedRo() {
                 return true;
             }
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @Override
             @UnsupportedAppUsage
             public boolean enabledFixedRoExported() {
                 return true;
             }
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @Override
             @UnsupportedAppUsage
             public boolean enabledRo() {
                 return true;
             }
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @Override
             @UnsupportedAppUsage
             public boolean enabledRoExported() {
                 return true;
             }
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @Override
             @UnsupportedAppUsage
             public boolean enabledRw() {
@@ -566,13 +592,15 @@
             public static final String FLAG_ENABLED_FIXED_RO_EXPORTED = "com.android.aconfig.test.enabled_fixed_ro_exported";
             /** @hide */
             public static final String FLAG_ENABLED_RO_EXPORTED = "com.android.aconfig.test.enabled_ro_exported";
-
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             public static boolean disabledRwExported() {
                 return FEATURE_FLAGS.disabledRwExported();
             }
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             public static boolean enabledFixedRoExported() {
                 return FEATURE_FLAGS.enabledFixedRoExported();
             }
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             public static boolean enabledRoExported() {
                 return FEATURE_FLAGS.enabledRoExported();
             }
@@ -584,8 +612,11 @@
         package com.android.aconfig.test;
         /** @hide */
         public interface FeatureFlags {
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             boolean disabledRwExported();
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             boolean enabledFixedRoExported();
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             boolean enabledRoExported();
         }
         "#;
@@ -623,7 +654,7 @@
                 }
                 aconfig_test_is_cached = true;
             }
-
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @Override
             public boolean disabledRwExported() {
                 if (!aconfig_test_is_cached) {
@@ -631,7 +662,7 @@
                 }
                 return disabledRwExported;
             }
-
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @Override
             public boolean enabledFixedRoExported() {
                 if (!aconfig_test_is_cached) {
@@ -639,7 +670,7 @@
                 }
                 return enabledFixedRoExported;
             }
-
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @Override
             public boolean enabledRoExported() {
                 if (!aconfig_test_is_cached) {
@@ -761,54 +792,63 @@
         import android.compat.annotation.UnsupportedAppUsage;
         /** @hide */
         public final class FeatureFlagsImpl implements FeatureFlags {
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @Override
             @UnsupportedAppUsage
             public boolean disabledRo() {
                 throw new UnsupportedOperationException(
                     "Method is not implemented.");
             }
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @Override
             @UnsupportedAppUsage
             public boolean disabledRw() {
                 throw new UnsupportedOperationException(
                     "Method is not implemented.");
             }
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @Override
             @UnsupportedAppUsage
             public boolean disabledRwExported() {
                 throw new UnsupportedOperationException(
                     "Method is not implemented.");
             }
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @Override
             @UnsupportedAppUsage
             public boolean disabledRwInOtherNamespace() {
                 throw new UnsupportedOperationException(
                     "Method is not implemented.");
             }
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @Override
             @UnsupportedAppUsage
             public boolean enabledFixedRo() {
                 throw new UnsupportedOperationException(
                     "Method is not implemented.");
             }
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @Override
             @UnsupportedAppUsage
             public boolean enabledFixedRoExported() {
                 throw new UnsupportedOperationException(
                     "Method is not implemented.");
             }
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @Override
             @UnsupportedAppUsage
             public boolean enabledRo() {
                 throw new UnsupportedOperationException(
                     "Method is not implemented.");
             }
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @Override
             @UnsupportedAppUsage
             public boolean enabledRoExported() {
                 throw new UnsupportedOperationException(
                     "Method is not implemented.");
             }
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @Override
             @UnsupportedAppUsage
             public boolean enabledRw() {
@@ -861,21 +901,27 @@
         import android.compat.annotation.UnsupportedAppUsage;
         /** @hide */
         public interface FeatureFlags {
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @com.android.aconfig.annotations.AssumeFalseForR8
             @UnsupportedAppUsage
             boolean disabledRo();
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @com.android.aconfig.annotations.AssumeFalseForR8
             @UnsupportedAppUsage
             boolean disabledRw();
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @com.android.aconfig.annotations.AssumeFalseForR8
             @UnsupportedAppUsage
             boolean disabledRwInOtherNamespace();
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @com.android.aconfig.annotations.AssumeTrueForR8
             @UnsupportedAppUsage
             boolean enabledFixedRo();
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @com.android.aconfig.annotations.AssumeTrueForR8
             @UnsupportedAppUsage
             boolean enabledRo();
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @com.android.aconfig.annotations.AssumeTrueForR8
             @UnsupportedAppUsage
             boolean enabledRw();
@@ -887,31 +933,37 @@
         import android.compat.annotation.UnsupportedAppUsage;
         /** @hide */
         public final class FeatureFlagsImpl implements FeatureFlags {
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @Override
             @UnsupportedAppUsage
             public boolean disabledRo() {
                 return false;
             }
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @Override
             @UnsupportedAppUsage
             public boolean disabledRw() {
                 return false;
             }
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @Override
             @UnsupportedAppUsage
             public boolean disabledRwInOtherNamespace() {
                 return false;
             }
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @Override
             @UnsupportedAppUsage
             public boolean enabledFixedRo() {
                 return true;
             }
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @Override
             @UnsupportedAppUsage
             public boolean enabledRo() {
                 return true;
             }
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @Override
             @UnsupportedAppUsage
             public boolean enabledRw() {
@@ -938,32 +990,37 @@
             public static final String FLAG_ENABLED_RO = "com.android.aconfig.test.enabled_ro";
             /** @hide */
             public static final String FLAG_ENABLED_RW = "com.android.aconfig.test.enabled_rw";
-
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @com.android.aconfig.annotations.AssumeFalseForR8
             @UnsupportedAppUsage
             public static boolean disabledRo() {
                 return FEATURE_FLAGS.disabledRo();
             }
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @com.android.aconfig.annotations.AssumeFalseForR8
             @UnsupportedAppUsage
             public static boolean disabledRw() {
                 return FEATURE_FLAGS.disabledRw();
             }
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @com.android.aconfig.annotations.AssumeFalseForR8
             @UnsupportedAppUsage
             public static boolean disabledRwInOtherNamespace() {
                 return FEATURE_FLAGS.disabledRwInOtherNamespace();
             }
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @com.android.aconfig.annotations.AssumeTrueForR8
             @UnsupportedAppUsage
             public static boolean enabledFixedRo() {
                 return FEATURE_FLAGS.enabledFixedRo();
             }
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @com.android.aconfig.annotations.AssumeTrueForR8
             @UnsupportedAppUsage
             public static boolean enabledRo() {
                 return FEATURE_FLAGS.enabledRo();
             }
+            @com.android.aconfig.annotations.AconfigFlagAccessor
             @com.android.aconfig.annotations.AssumeTrueForR8
             @UnsupportedAppUsage
             public static boolean enabledRw() {
diff --git a/tools/aconfig/aconfig/src/storage/flag_table.rs b/tools/aconfig/aconfig/src/storage/flag_table.rs
index a07f179..b339821 100644
--- a/tools/aconfig/aconfig/src/storage/flag_table.rs
+++ b/tools/aconfig/aconfig/src/storage/flag_table.rs
@@ -141,79 +141,18 @@
     use super::*;
     use crate::storage::{group_flags_by_package, tests::parse_all_test_flags};
 
-    // create test baseline, syntactic sugar
-    fn new_expected_node(
-        package_id: u32,
-        flag_name: &str,
-        flag_type: u16,
-        flag_id: u16,
-        next_offset: Option<u32>,
-    ) -> FlagTableNode {
-        FlagTableNode {
-            package_id,
-            flag_name: flag_name.to_string(),
-            flag_type: StoredFlagType::try_from(flag_type).unwrap(),
-            flag_id,
-            next_offset,
-        }
-    }
-
-    fn create_test_flag_table() -> Result<FlagTable> {
+    fn create_test_flag_table_from_source() -> Result<FlagTable> {
         let caches = parse_all_test_flags();
         let packages = group_flags_by_package(caches.iter());
-        create_flag_table("system", &packages)
+        create_flag_table("mockup", &packages)
     }
 
     #[test]
     // this test point locks down the table creation and each field
     fn test_table_contents() {
-        let flag_table = create_test_flag_table();
+        let flag_table = create_test_flag_table_from_source();
         assert!(flag_table.is_ok());
-
-        let header: &FlagTableHeader = &flag_table.as_ref().unwrap().header;
-        let expected_header = FlagTableHeader {
-            version: FILE_VERSION,
-            container: String::from("system"),
-            file_type: StorageFileType::FlagMap as u8,
-            file_size: 321,
-            num_flags: 8,
-            bucket_offset: 31,
-            node_offset: 99,
-        };
-        assert_eq!(header, &expected_header);
-
-        let buckets: &Vec<Option<u32>> = &flag_table.as_ref().unwrap().buckets;
-        let expected_bucket: Vec<Option<u32>> = vec![
-            Some(99),
-            Some(125),
-            None,
-            None,
-            None,
-            Some(178),
-            None,
-            Some(204),
-            None,
-            Some(262),
-            None,
-            None,
-            None,
-            None,
-            None,
-            Some(294),
-            None,
-        ];
-        assert_eq!(buckets, &expected_bucket);
-
-        let nodes: &Vec<FlagTableNode> = &flag_table.as_ref().unwrap().nodes;
-        assert_eq!(nodes.len(), 8);
-
-        assert_eq!(nodes[0], new_expected_node(0, "enabled_ro", 1, 1, None));
-        assert_eq!(nodes[1], new_expected_node(0, "enabled_rw", 0, 2, Some(151)));
-        assert_eq!(nodes[2], new_expected_node(1, "disabled_ro", 1, 0, None));
-        assert_eq!(nodes[3], new_expected_node(2, "enabled_ro", 1, 1, None));
-        assert_eq!(nodes[4], new_expected_node(1, "enabled_fixed_ro", 2, 1, Some(236)));
-        assert_eq!(nodes[5], new_expected_node(1, "enabled_ro", 1, 2, None));
-        assert_eq!(nodes[6], new_expected_node(2, "enabled_fixed_ro", 2, 0, None));
-        assert_eq!(nodes[7], new_expected_node(0, "disabled_rw", 0, 0, None));
+        let expected_flag_table = aconfig_storage_file::test_utils::create_test_flag_table();
+        assert_eq!(flag_table.unwrap(), expected_flag_table);
     }
 }
diff --git a/tools/aconfig/aconfig/src/storage/flag_value.rs b/tools/aconfig/aconfig/src/storage/flag_value.rs
index 4dcf751..a37ad9f 100644
--- a/tools/aconfig/aconfig/src/storage/flag_value.rs
+++ b/tools/aconfig/aconfig/src/storage/flag_value.rs
@@ -64,31 +64,19 @@
     use super::*;
     use crate::storage::{group_flags_by_package, tests::parse_all_test_flags};
 
-    pub fn create_test_flag_value_list() -> Result<FlagValueList> {
+    pub fn create_test_flag_value_list_from_source() -> Result<FlagValueList> {
         let caches = parse_all_test_flags();
         let packages = group_flags_by_package(caches.iter());
-        create_flag_value("system", &packages)
+        create_flag_value("mockup", &packages)
     }
 
     #[test]
     // this test point locks down the flag value creation and each field
     fn test_list_contents() {
-        let flag_value_list = create_test_flag_value_list();
+        let flag_value_list = create_test_flag_value_list_from_source();
         assert!(flag_value_list.is_ok());
-
-        let header: &FlagValueHeader = &flag_value_list.as_ref().unwrap().header;
-        let expected_header = FlagValueHeader {
-            version: FILE_VERSION,
-            container: String::from("system"),
-            file_type: StorageFileType::FlagVal as u8,
-            file_size: 35,
-            num_flags: 8,
-            boolean_value_offset: 27,
-        };
-        assert_eq!(header, &expected_header);
-
-        let booleans: &Vec<bool> = &flag_value_list.as_ref().unwrap().booleans;
-        let expected_booleans: Vec<bool> = vec![false, true, true, false, true, true, true, true];
-        assert_eq!(booleans, &expected_booleans);
+        let expected_flag_value_list =
+            aconfig_storage_file::test_utils::create_test_flag_value_list();
+        assert_eq!(flag_value_list.unwrap(), expected_flag_value_list);
     }
 }
diff --git a/tools/aconfig/aconfig/src/storage/package_table.rs b/tools/aconfig/aconfig/src/storage/package_table.rs
index 4e3d987..0a3df77 100644
--- a/tools/aconfig/aconfig/src/storage/package_table.rs
+++ b/tools/aconfig/aconfig/src/storage/package_table.rs
@@ -109,56 +109,18 @@
     use super::*;
     use crate::storage::{group_flags_by_package, tests::parse_all_test_flags};
 
-    pub fn create_test_package_table() -> Result<PackageTable> {
+    pub fn create_test_package_table_from_source() -> Result<PackageTable> {
         let caches = parse_all_test_flags();
         let packages = group_flags_by_package(caches.iter());
-        create_package_table("system", &packages)
+        create_package_table("mockup", &packages)
     }
 
     #[test]
     // this test point locks down the table creation and each field
     fn test_table_contents() {
-        let package_table = create_test_package_table();
+        let package_table = create_test_package_table_from_source();
         assert!(package_table.is_ok());
-
-        let header: &PackageTableHeader = &package_table.as_ref().unwrap().header;
-        let expected_header = PackageTableHeader {
-            version: FILE_VERSION,
-            container: String::from("system"),
-            file_type: StorageFileType::PackageMap as u8,
-            file_size: 209,
-            num_packages: 3,
-            bucket_offset: 31,
-            node_offset: 59,
-        };
-        assert_eq!(header, &expected_header);
-
-        let buckets: &Vec<Option<u32>> = &package_table.as_ref().unwrap().buckets;
-        let expected: Vec<Option<u32>> = vec![Some(59), None, None, Some(109), None, None, None];
-        assert_eq!(buckets, &expected);
-
-        let nodes: &Vec<PackageTableNode> = &package_table.as_ref().unwrap().nodes;
-        assert_eq!(nodes.len(), 3);
-        let first_node_expected = PackageTableNode {
-            package_name: String::from("com.android.aconfig.storage.test_2"),
-            package_id: 1,
-            boolean_offset: 3,
-            next_offset: None,
-        };
-        assert_eq!(nodes[0], first_node_expected);
-        let second_node_expected = PackageTableNode {
-            package_name: String::from("com.android.aconfig.storage.test_1"),
-            package_id: 0,
-            boolean_offset: 0,
-            next_offset: Some(159),
-        };
-        assert_eq!(nodes[1], second_node_expected);
-        let third_node_expected = PackageTableNode {
-            package_name: String::from("com.android.aconfig.storage.test_4"),
-            package_id: 2,
-            boolean_offset: 6,
-            next_offset: None,
-        };
-        assert_eq!(nodes[2], third_node_expected);
+        let expected_package_table = aconfig_storage_file::test_utils::create_test_package_table();
+        assert_eq!(package_table.unwrap(), expected_package_table);
     }
 }
diff --git a/tools/aconfig/aconfig/templates/FeatureFlags.java.template b/tools/aconfig/aconfig/templates/FeatureFlags.java.template
index 13edcb4..b90b201 100644
--- a/tools/aconfig/aconfig/templates/FeatureFlags.java.template
+++ b/tools/aconfig/aconfig/templates/FeatureFlags.java.template
@@ -6,6 +6,7 @@
 /** @hide */
 public interface FeatureFlags \{
 {{ for item in flag_elements }}
+    @com.android.aconfig.annotations.AconfigFlagAccessor
 {{ -if not item.is_read_write }}
 {{ -if item.default_value }}
     @com.android.aconfig.annotations.AssumeTrueForR8
diff --git a/tools/aconfig/aconfig/templates/FeatureFlagsImpl.java.template b/tools/aconfig/aconfig/templates/FeatureFlagsImpl.java.template
index 12b2fc1..704f25b 100644
--- a/tools/aconfig/aconfig/templates/FeatureFlagsImpl.java.template
+++ b/tools/aconfig/aconfig/templates/FeatureFlagsImpl.java.template
@@ -45,6 +45,7 @@
 {{ endfor- }}
 {{ -endif }}{#- end of runtime_lookup_required #}
 {{ -for flag in flag_elements }}
+    @com.android.aconfig.annotations.AconfigFlagAccessor
     @Override
 {{ -if not library_exported }}
     @UnsupportedAppUsage
@@ -66,6 +67,7 @@
 /** @hide */
 public final class FeatureFlagsImpl implements FeatureFlags \{
 {{ for flag in flag_elements }}
+    @com.android.aconfig.annotations.AconfigFlagAccessor
     @Override
 {{ -if not library_exported }}
     @UnsupportedAppUsage
diff --git a/tools/aconfig/aconfig/templates/Flags.java.template b/tools/aconfig/aconfig/templates/Flags.java.template
index e105991..55db924 100644
--- a/tools/aconfig/aconfig/templates/Flags.java.template
+++ b/tools/aconfig/aconfig/templates/Flags.java.template
@@ -10,6 +10,7 @@
     public static final String FLAG_{item.flag_name_constant_suffix} = "{item.device_config_flag}";
 {{- endfor }}
 {{ -for item in flag_elements}}
+    @com.android.aconfig.annotations.AconfigFlagAccessor
 {{ -if not item.is_read_write }}
 {{ -if item.default_value }}
     @com.android.aconfig.annotations.AssumeTrueForR8
diff --git a/tools/aconfig/aconfig_storage_file/src/flag_table.rs b/tools/aconfig/aconfig_storage_file/src/flag_table.rs
index 98a1321..f41f4ce 100644
--- a/tools/aconfig/aconfig_storage_file/src/flag_table.rs
+++ b/tools/aconfig/aconfig_storage_file/src/flag_table.rs
@@ -251,7 +251,7 @@
         let bytes = &flag_table.into_bytes();
         let mut head = 0;
         let version = read_u32_from_bytes(bytes, &mut head).unwrap();
-        assert_eq!(version, 1234)
+        assert_eq!(version, 1);
     }
 
     #[test]
diff --git a/tools/aconfig/aconfig_storage_file/src/flag_value.rs b/tools/aconfig/aconfig_storage_file/src/flag_value.rs
index 40ccb34..506924b 100644
--- a/tools/aconfig/aconfig_storage_file/src/flag_value.rs
+++ b/tools/aconfig/aconfig_storage_file/src/flag_value.rs
@@ -158,7 +158,7 @@
         let bytes = &flag_value_list.into_bytes();
         let mut head = 0;
         let version = read_u32_from_bytes(bytes, &mut head).unwrap();
-        assert_eq!(version, 1234)
+        assert_eq!(version, 1);
     }
 
     #[test]
diff --git a/tools/aconfig/aconfig_storage_file/src/lib.rs b/tools/aconfig/aconfig_storage_file/src/lib.rs
index a47926f..85f1f0a 100644
--- a/tools/aconfig/aconfig_storage_file/src/lib.rs
+++ b/tools/aconfig/aconfig_storage_file/src/lib.rs
@@ -37,11 +37,10 @@
 pub mod flag_value;
 pub mod package_table;
 pub mod protos;
-
-#[cfg(test)]
-mod test_utils;
+pub mod test_utils;
 
 use anyhow::anyhow;
+use std::cmp::Ordering;
 use std::collections::hash_map::DefaultHasher;
 use std::fs::File;
 use std::hash::{Hash, Hasher};
@@ -124,6 +123,48 @@
     }
 }
 
+/// Storage query api error
+#[non_exhaustive]
+#[derive(thiserror::Error, Debug)]
+pub enum AconfigStorageError {
+    #[error("failed to read the file")]
+    FileReadFail(#[source] anyhow::Error),
+
+    #[error("fail to parse protobuf")]
+    ProtobufParseFail(#[source] anyhow::Error),
+
+    #[error("storage files not found for this container")]
+    StorageFileNotFound(#[source] anyhow::Error),
+
+    #[error("fail to map storage file")]
+    MapFileFail(#[source] anyhow::Error),
+
+    #[error("fail to get mapped file")]
+    ObtainMappedFileFail(#[source] anyhow::Error),
+
+    #[error("fail to flush mapped storage file")]
+    MapFlushFail(#[source] anyhow::Error),
+
+    #[error("number of items in hash table exceed limit")]
+    HashTableSizeLimit(#[source] anyhow::Error),
+
+    #[error("failed to parse bytes into data")]
+    BytesParseFail(#[source] anyhow::Error),
+
+    #[error("cannot parse storage files with a higher version")]
+    HigherStorageFileVersion(#[source] anyhow::Error),
+
+    #[error("invalid storage file byte offset")]
+    InvalidStorageFileOffset(#[source] anyhow::Error),
+
+    #[error("failed to create file")]
+    FileCreationFail(#[source] anyhow::Error),
+
+    #[error("invalid stored flag type")]
+    InvalidStoredFlagType(#[source] anyhow::Error),
+}
+
+
 /// Get the right hash table size given number of entries in the table. Use a
 /// load factor of 0.5 for performance.
 pub fn get_table_size(entries: u32) -> Result<u32, AconfigStorageError> {
@@ -186,47 +227,6 @@
     Ok(val)
 }
 
-/// Storage query api error
-#[non_exhaustive]
-#[derive(thiserror::Error, Debug)]
-pub enum AconfigStorageError {
-    #[error("failed to read the file")]
-    FileReadFail(#[source] anyhow::Error),
-
-    #[error("fail to parse protobuf")]
-    ProtobufParseFail(#[source] anyhow::Error),
-
-    #[error("storage files not found for this container")]
-    StorageFileNotFound(#[source] anyhow::Error),
-
-    #[error("fail to map storage file")]
-    MapFileFail(#[source] anyhow::Error),
-
-    #[error("fail to get mapped file")]
-    ObtainMappedFileFail(#[source] anyhow::Error),
-
-    #[error("fail to flush mapped storage file")]
-    MapFlushFail(#[source] anyhow::Error),
-
-    #[error("number of items in hash table exceed limit")]
-    HashTableSizeLimit(#[source] anyhow::Error),
-
-    #[error("failed to parse bytes into data")]
-    BytesParseFail(#[source] anyhow::Error),
-
-    #[error("cannot parse storage files with a higher version")]
-    HigherStorageFileVersion(#[source] anyhow::Error),
-
-    #[error("invalid storage file byte offset")]
-    InvalidStorageFileOffset(#[source] anyhow::Error),
-
-    #[error("failed to create file")]
-    FileCreationFail(#[source] anyhow::Error),
-
-    #[error("invalid stored flag type")]
-    InvalidStoredFlagType(#[source] anyhow::Error),
-}
-
 /// Read in storage file as bytes
 pub fn read_file_to_bytes(file_path: &str) -> Result<Vec<u8>, AconfigStorageError> {
     let mut file = File::open(file_path).map_err(|errmsg| {
@@ -235,7 +235,7 @@
     let mut buffer = Vec::new();
     file.read_to_end(&mut buffer).map_err(|errmsg| {
         AconfigStorageError::FileReadFail(anyhow!(
-            "Failed to read 4 bytes from file {}: {}",
+            "Failed to read bytes from file {}: {}",
             file_path,
             errmsg
         ))
@@ -248,7 +248,7 @@
     package_map: &str,
     flag_map: &str,
     flag_val: &str,
-) -> Result<Vec<(String, String, bool)>, AconfigStorageError> {
+) -> Result<Vec<(String, String, StoredFlagType, bool)>, AconfigStorageError> {
     let package_table = PackageTable::from_bytes(&read_file_to_bytes(package_map)?)?;
     let flag_table = FlagTable::from_bytes(&read_file_to_bytes(flag_map)?)?;
     let flag_value_list = FlagValueList::from_bytes(&read_file_to_bytes(flag_val)?)?;
@@ -263,10 +263,15 @@
         let (package_name, package_offset) = package_info[node.package_id as usize];
         let flag_offset = package_offset + node.flag_id as u32;
         let flag_value = flag_value_list.booleans[flag_offset as usize];
-        flags.push((String::from(package_name), node.flag_name.clone(), flag_value));
+        flags.push((String::from(package_name), node.flag_name.clone(), node.flag_type, flag_value));
     }
 
-    flags.sort_by(|v1, v2| v1.0.cmp(&v2.0));
+    flags.sort_by(|v1, v2| {
+        match v1.0.cmp(&v2.0) {
+            Ordering::Equal => v1.1.cmp(&v2.1),
+            other => other,
+        }
+    });
     Ok(flags)
 }
 
@@ -294,29 +299,53 @@
         let flags =
             list_flags(&package_table_path, &flag_table_path, &flag_value_list_path).unwrap();
         let expected = [
-            (String::from("com.android.aconfig.storage.test_1"), String::from("enabled_ro"), true),
-            (String::from("com.android.aconfig.storage.test_1"), String::from("enabled_rw"), false),
             (
                 String::from("com.android.aconfig.storage.test_1"),
                 String::from("disabled_rw"),
+                StoredFlagType::ReadWriteBoolean,
                 false,
             ),
             (
+                String::from("com.android.aconfig.storage.test_1"),
+                String::from("enabled_ro"),
+                StoredFlagType::ReadOnlyBoolean,
+                true
+            ),
+            (
+                String::from("com.android.aconfig.storage.test_1"),
+                String::from("enabled_rw"),
+                StoredFlagType::ReadWriteBoolean,
+                true
+            ),
+            (
                 String::from("com.android.aconfig.storage.test_2"),
                 String::from("disabled_ro"),
+                StoredFlagType::ReadOnlyBoolean,
                 false,
             ),
             (
                 String::from("com.android.aconfig.storage.test_2"),
                 String::from("enabled_fixed_ro"),
+                StoredFlagType::FixedReadOnlyBoolean,
                 true,
             ),
-            (String::from("com.android.aconfig.storage.test_2"), String::from("enabled_ro"), true),
-            (String::from("com.android.aconfig.storage.test_4"), String::from("enabled_ro"), true),
+            (
+                String::from("com.android.aconfig.storage.test_2"),
+                String::from("enabled_ro"),
+                StoredFlagType::ReadOnlyBoolean,
+                true
+            ),
             (
                 String::from("com.android.aconfig.storage.test_4"),
                 String::from("enabled_fixed_ro"),
-                false,
+                StoredFlagType::FixedReadOnlyBoolean,
+                true,
+            ),
+            (
+                String::from("com.android.aconfig.storage.test_4"),
+                String::from("enabled_ro"),
+                StoredFlagType::ReadOnlyBoolean,
+                true
             ),
         ];
         assert_eq!(flags, expected);
diff --git a/tools/aconfig/aconfig_storage_file/src/main.rs b/tools/aconfig/aconfig_storage_file/src/main.rs
index 12e0024..b686274 100644
--- a/tools/aconfig/aconfig_storage_file/src/main.rs
+++ b/tools/aconfig/aconfig_storage_file/src/main.rs
@@ -88,8 +88,8 @@
             let flag_map = sub_matches.get_one::<String>("flag-map").unwrap();
             let flag_val = sub_matches.get_one::<String>("flag-val").unwrap();
             let flags = list_flags(package_map, flag_map, flag_val)?;
-            for flag in flags.iter() {
-                println!("{}: {}", flag.0, flag.1);
+            for (package_name, flag_name, flag_type, flag_value) in flags.iter() {
+                println!("{} {} {:?} {}", package_name, flag_name, flag_type, flag_value);
             }
         }
         _ => unreachable!(),
diff --git a/tools/aconfig/aconfig_storage_file/src/package_table.rs b/tools/aconfig/aconfig_storage_file/src/package_table.rs
index e377115..36b0493 100644
--- a/tools/aconfig/aconfig_storage_file/src/package_table.rs
+++ b/tools/aconfig/aconfig_storage_file/src/package_table.rs
@@ -250,7 +250,7 @@
         let bytes = &package_table.into_bytes();
         let mut head = 0;
         let version = read_u32_from_bytes(bytes, &mut head).unwrap();
-        assert_eq!(version, 1234)
+        assert_eq!(version, 1);
     }
 
     #[test]
diff --git a/tools/aconfig/aconfig_storage_file/src/test_utils.rs b/tools/aconfig/aconfig_storage_file/src/test_utils.rs
index 4097ba6..9198f93 100644
--- a/tools/aconfig/aconfig_storage_file/src/test_utils.rs
+++ b/tools/aconfig/aconfig_storage_file/src/test_utils.rs
@@ -24,10 +24,10 @@
 use std::io::Write;
 use tempfile::NamedTempFile;
 
-pub(crate) fn create_test_package_table() -> PackageTable {
+pub fn create_test_package_table() -> PackageTable {
     let header = PackageTableHeader {
-        version: 1234,
-        container: String::from("system"),
+        version: 1,
+        container: String::from("mockup"),
         file_type: StorageFileType::PackageMap as u8,
         file_size: 209,
         num_packages: 3,
@@ -76,10 +76,10 @@
     }
 }
 
-pub(crate) fn create_test_flag_table() -> FlagTable {
+pub fn create_test_flag_table() -> FlagTable {
     let header = FlagTableHeader {
-        version: 1234,
-        container: String::from("system"),
+        version: 1,
+        container: String::from("mockup"),
         file_type: StorageFileType::FlagMap as u8,
         file_size: 321,
         num_flags: 8,
@@ -107,34 +107,34 @@
     ];
     let nodes = vec![
         FlagTableNode::new_expected(0, "enabled_ro", 1, 1, None),
-        FlagTableNode::new_expected(0, "enabled_rw", 1, 2, Some(151)),
+        FlagTableNode::new_expected(0, "enabled_rw", 0, 2, Some(151)),
         FlagTableNode::new_expected(1, "disabled_ro", 1, 0, None),
         FlagTableNode::new_expected(2, "enabled_ro", 1, 1, None),
-        FlagTableNode::new_expected(1, "enabled_fixed_ro", 1, 1, Some(236)),
+        FlagTableNode::new_expected(1, "enabled_fixed_ro", 2, 1, Some(236)),
         FlagTableNode::new_expected(1, "enabled_ro", 1, 2, None),
-        FlagTableNode::new_expected(2, "enabled_fixed_ro", 1, 0, None),
-        FlagTableNode::new_expected(0, "disabled_rw", 1, 0, None),
+        FlagTableNode::new_expected(2, "enabled_fixed_ro", 2, 0, None),
+        FlagTableNode::new_expected(0, "disabled_rw", 0, 0, None),
     ];
     FlagTable { header, buckets, nodes }
 }
 
-pub(crate) fn create_test_flag_value_list() -> FlagValueList {
+pub fn create_test_flag_value_list() -> FlagValueList {
     let header = FlagValueHeader {
-        version: 1234,
-        container: String::from("system"),
+        version: 1,
+        container: String::from("mockup"),
         file_type: StorageFileType::FlagVal as u8,
         file_size: 35,
         num_flags: 8,
         boolean_value_offset: 27,
     };
-    let booleans: Vec<bool> = vec![false, true, false, false, true, true, false, true];
+    let booleans: Vec<bool> = vec![false, true, true, false, true, true, true, true];
     FlagValueList { header, booleans }
 }
 
-pub(crate) fn create_test_flag_info_list() -> FlagInfoList {
+pub fn create_test_flag_info_list() -> FlagInfoList {
     let header = FlagInfoHeader {
         version: 1234,
-        container: String::from("system"),
+        container: String::from("mockup"),
         file_type: StorageFileType::FlagInfo as u8,
         file_size: 35,
         num_flags: 8,
@@ -144,7 +144,7 @@
     FlagInfoList { header, nodes }
 }
 
-pub(crate) fn write_bytes_to_temp_file(bytes: &[u8]) -> Result<NamedTempFile, AconfigStorageError> {
+pub fn write_bytes_to_temp_file(bytes: &[u8]) -> Result<NamedTempFile, AconfigStorageError> {
     let mut file = NamedTempFile::new().map_err(|_| {
         AconfigStorageError::FileCreationFail(anyhow!("Failed to create temp file"))
     })?;
diff --git a/tools/aconfig/aconfig_storage_read_api/src/flag_table_query.rs b/tools/aconfig/aconfig_storage_read_api/src/flag_table_query.rs
index 8ce2397..a251b41 100644
--- a/tools/aconfig/aconfig_storage_read_api/src/flag_table_query.rs
+++ b/tools/aconfig/aconfig_storage_read_api/src/flag_table_query.rs
@@ -65,66 +65,7 @@
 #[cfg(test)]
 mod tests {
     use super::*;
-    use aconfig_storage_file::{FlagTable, StorageFileType, StoredFlagType};
-
-    // create test baseline, syntactic sugar
-    fn new_expected_node(
-        package_id: u32,
-        flag_name: &str,
-        flag_type: u16,
-        flag_id: u16,
-        next_offset: Option<u32>,
-    ) -> FlagTableNode {
-        FlagTableNode {
-            package_id,
-            flag_name: flag_name.to_string(),
-            flag_type: StoredFlagType::try_from(flag_type).unwrap(),
-            flag_id,
-            next_offset,
-        }
-    }
-
-    pub fn create_test_flag_table() -> FlagTable {
-        let header = FlagTableHeader {
-            version: crate::FILE_VERSION,
-            container: String::from("system"),
-            file_type: StorageFileType::FlagMap as u8,
-            file_size: 321,
-            num_flags: 8,
-            bucket_offset: 31,
-            node_offset: 99,
-        };
-        let buckets: Vec<Option<u32>> = vec![
-            Some(99),
-            Some(125),
-            None,
-            None,
-            None,
-            Some(178),
-            None,
-            Some(204),
-            None,
-            Some(262),
-            None,
-            None,
-            None,
-            None,
-            None,
-            Some(294),
-            None,
-        ];
-        let nodes = vec![
-            new_expected_node(0, "enabled_ro", 1, 1, None),
-            new_expected_node(0, "enabled_rw", 1, 2, Some(151)),
-            new_expected_node(1, "disabled_ro", 1, 0, None),
-            new_expected_node(2, "enabled_ro", 1, 1, None),
-            new_expected_node(1, "enabled_fixed_ro", 1, 1, Some(236)),
-            new_expected_node(1, "enabled_ro", 1, 2, None),
-            new_expected_node(2, "enabled_fixed_ro", 1, 0, None),
-            new_expected_node(0, "disabled_rw", 1, 0, None),
-        ];
-        FlagTable { header, buckets, nodes }
-    }
+    use aconfig_storage_file::test_utils::create_test_flag_table;
 
     #[test]
     // this test point locks down table query
diff --git a/tools/aconfig/aconfig_storage_read_api/src/lib.rs b/tools/aconfig/aconfig_storage_read_api/src/lib.rs
index 8a71480..da64cb7 100644
--- a/tools/aconfig/aconfig_storage_read_api/src/lib.rs
+++ b/tools/aconfig/aconfig_storage_read_api/src/lib.rs
@@ -326,7 +326,7 @@
             r#"
 files {{
     version: 0
-    container: "system"
+    container: "mockup"
     package_map: "{}"
     flag_map: "{}"
     flag_val: "{}"
@@ -347,7 +347,7 @@
         let [_package_map, _flag_map, _flag_val, pb_file] = create_test_storage_files();
         let pb_file_path = pb_file.path().display().to_string();
         let package_mapped_file = unsafe {
-            get_mapped_file(&pb_file_path, "system", StorageFileType::PackageMap).unwrap()
+            get_mapped_file(&pb_file_path, "mockup", StorageFileType::PackageMap).unwrap()
         };
 
         let package_offset =
@@ -378,7 +378,7 @@
         let [_package_map, _flag_map, _flag_val, pb_file] = create_test_storage_files();
         let pb_file_path = pb_file.path().display().to_string();
         let flag_mapped_file =
-            unsafe { get_mapped_file(&pb_file_path, "system", StorageFileType::FlagMap).unwrap() };
+            unsafe { get_mapped_file(&pb_file_path, "mockup", StorageFileType::FlagMap).unwrap() };
 
         let baseline = vec![
             (0, "enabled_ro", 1u16),
@@ -403,8 +403,8 @@
         let [_package_map, _flag_map, _flag_val, pb_file] = create_test_storage_files();
         let pb_file_path = pb_file.path().display().to_string();
         let flag_value_file =
-            unsafe { get_mapped_file(&pb_file_path, "system", StorageFileType::FlagVal).unwrap() };
-        let baseline: Vec<bool> = vec![false; 8];
+            unsafe { get_mapped_file(&pb_file_path, "mockup", StorageFileType::FlagVal).unwrap() };
+        let baseline: Vec<bool> = vec![false, true, true, false, true, true, true, true];
         for (offset, expected_value) in baseline.into_iter().enumerate() {
             let flag_value = get_boolean_flag_value(&flag_value_file, offset as u32).unwrap();
             assert_eq!(flag_value, expected_value);
diff --git a/tools/aconfig/aconfig_storage_read_api/src/package_table_query.rs b/tools/aconfig/aconfig_storage_read_api/src/package_table_query.rs
index 190de99..d83844e 100644
--- a/tools/aconfig/aconfig_storage_read_api/src/package_table_query.rs
+++ b/tools/aconfig/aconfig_storage_read_api/src/package_table_query.rs
@@ -72,40 +72,7 @@
 #[cfg(test)]
 mod tests {
     use super::*;
-    use aconfig_storage_file::{PackageTable, StorageFileType};
-
-    pub fn create_test_package_table() -> PackageTable {
-        let header = PackageTableHeader {
-            version: crate::FILE_VERSION,
-            container: String::from("system"),
-            file_type: StorageFileType::PackageMap as u8,
-            file_size: 209,
-            num_packages: 3,
-            bucket_offset: 31,
-            node_offset: 59,
-        };
-        let buckets: Vec<Option<u32>> = vec![Some(59), None, None, Some(109), None, None, None];
-        let first_node = PackageTableNode {
-            package_name: String::from("com.android.aconfig.storage.test_2"),
-            package_id: 1,
-            boolean_offset: 3,
-            next_offset: None,
-        };
-        let second_node = PackageTableNode {
-            package_name: String::from("com.android.aconfig.storage.test_1"),
-            package_id: 0,
-            boolean_offset: 0,
-            next_offset: Some(159),
-        };
-        let third_node = PackageTableNode {
-            package_name: String::from("com.android.aconfig.storage.test_4"),
-            package_id: 2,
-            boolean_offset: 6,
-            next_offset: None,
-        };
-        let nodes = vec![first_node, second_node, third_node];
-        PackageTable { header, buckets, nodes }
-    }
+    use aconfig_storage_file::test_utils::create_test_package_table;
 
     #[test]
     // this test point locks down table query
diff --git a/tools/aconfig/aconfig_storage_read_api/tests/flag.map b/tools/aconfig/aconfig_storage_read_api/tests/flag.map
index 5507894..d26e00f 100644
--- a/tools/aconfig/aconfig_storage_read_api/tests/flag.map
+++ b/tools/aconfig/aconfig_storage_read_api/tests/flag.map
Binary files differ
diff --git a/tools/aconfig/aconfig_storage_read_api/tests/flag.val b/tools/aconfig/aconfig_storage_read_api/tests/flag.val
index 75b8564..ed203d4 100644
--- a/tools/aconfig/aconfig_storage_read_api/tests/flag.val
+++ b/tools/aconfig/aconfig_storage_read_api/tests/flag.val
Binary files differ
diff --git a/tools/aconfig/aconfig_storage_read_api/tests/package.map b/tools/aconfig/aconfig_storage_read_api/tests/package.map
index 02267e5..6c46a03 100644
--- a/tools/aconfig/aconfig_storage_read_api/tests/package.map
+++ b/tools/aconfig/aconfig_storage_read_api/tests/package.map
Binary files differ
diff --git a/tools/aconfig/aconfig_storage_read_api/tests/storage_read_api_test.cpp b/tools/aconfig/aconfig_storage_read_api/tests/storage_read_api_test.cpp
index 1d36aae..539474b 100644
--- a/tools/aconfig/aconfig_storage_read_api/tests/storage_read_api_test.cpp
+++ b/tools/aconfig/aconfig_storage_read_api/tests/storage_read_api_test.cpp
@@ -52,7 +52,7 @@
     auto proto = storage_files();
     auto* info = proto.add_files();
     info->set_version(0);
-    info->set_container("system");
+    info->set_container("mockup");
     info->set_package_map(package_map);
     info->set_flag_map(flag_map);
     info->set_flag_val(flag_val);
@@ -113,7 +113,7 @@
 /// Test to lock down storage package offset query api
 TEST_F(AconfigStorageTest, test_package_offset_query) {
   auto mapped_file = private_api::get_mapped_file_impl(
-      storage_record_pb, "system", api::StorageFileType::package_map);
+      storage_record_pb, "mockup", api::StorageFileType::package_map);
   ASSERT_TRUE(mapped_file.ok());
 
   auto offset = api::get_package_offset(
@@ -141,7 +141,7 @@
 /// Test to lock down when querying none exist package
 TEST_F(AconfigStorageTest, test_none_existent_package_offset_query) {
   auto mapped_file = private_api::get_mapped_file_impl(
-      storage_record_pb, "system", api::StorageFileType::package_map);
+      storage_record_pb, "mockup", api::StorageFileType::package_map);
   ASSERT_TRUE(mapped_file.ok());
 
   auto offset = api::get_package_offset(
@@ -153,7 +153,7 @@
 /// Test to lock down storage flag offset query api
 TEST_F(AconfigStorageTest, test_flag_offset_query) {
   auto mapped_file = private_api::get_mapped_file_impl(
-      storage_record_pb, "system", api::StorageFileType::flag_map);
+      storage_record_pb, "mockup", api::StorageFileType::flag_map);
   ASSERT_TRUE(mapped_file.ok());
 
   auto baseline = std::vector<std::tuple<int, std::string, int>>{
@@ -177,7 +177,7 @@
 /// Test to lock down when querying none exist flag
 TEST_F(AconfigStorageTest, test_none_existent_flag_offset_query) {
   auto mapped_file = private_api::get_mapped_file_impl(
-      storage_record_pb, "system", api::StorageFileType::flag_map);
+      storage_record_pb, "mockup", api::StorageFileType::flag_map);
   ASSERT_TRUE(mapped_file.ok());
 
   auto offset = api::get_flag_offset(*mapped_file, 0, "none_exist");
@@ -192,20 +192,22 @@
 /// Test to lock down storage flag value query api
 TEST_F(AconfigStorageTest, test_boolean_flag_value_query) {
   auto mapped_file = private_api::get_mapped_file_impl(
-      storage_record_pb, "system", api::StorageFileType::flag_val);
+      storage_record_pb, "mockup", api::StorageFileType::flag_val);
   ASSERT_TRUE(mapped_file.ok());
 
+  auto expected_value = std::vector<bool>{
+    false, true, true, false, true, true, true, true};
   for (int offset = 0; offset < 8; ++offset) {
     auto value = api::get_boolean_flag_value(*mapped_file, offset);
     ASSERT_TRUE(value.ok());
-    ASSERT_FALSE(*value);
+    ASSERT_EQ(*value, expected_value[offset]);
   }
 }
 
 /// Negative test to lock down the error when querying flag value out of range
 TEST_F(AconfigStorageTest, test_invalid_boolean_flag_value_query) {
   auto mapped_file = private_api::get_mapped_file_impl(
-      storage_record_pb, "system", api::StorageFileType::flag_val);
+      storage_record_pb, "mockup", api::StorageFileType::flag_val);
   ASSERT_TRUE(mapped_file.ok());
 
   auto value = api::get_boolean_flag_value(*mapped_file, 8);
diff --git a/tools/aconfig/aconfig_storage_read_api/tests/storage_read_api_test.rs b/tools/aconfig/aconfig_storage_read_api/tests/storage_read_api_test.rs
index afcd5a7..7687d0f 100644
--- a/tools/aconfig/aconfig_storage_read_api/tests/storage_read_api_test.rs
+++ b/tools/aconfig/aconfig_storage_read_api/tests/storage_read_api_test.rs
@@ -24,7 +24,7 @@
             r#"
 files {{
     version: 0
-    container: "system"
+    container: "mockup"
     package_map: "{}"
     flag_map: "{}"
     flag_val: "{}"
@@ -61,7 +61,7 @@
         // SAFETY:
         // The safety here is ensured as the test process will not write to temp storage file
         let package_mapped_file = unsafe {
-            get_mapped_file(&pb_file_path, "system", StorageFileType::PackageMap).unwrap()
+            get_mapped_file(&pb_file_path, "mockup", StorageFileType::PackageMap).unwrap()
         };
 
         let package_offset =
@@ -93,7 +93,7 @@
         // SAFETY:
         // The safety here is ensured as the test process will not write to temp storage file
         let package_mapped_file = unsafe {
-            get_mapped_file(&pb_file_path, "system", StorageFileType::PackageMap).unwrap()
+            get_mapped_file(&pb_file_path, "mockup", StorageFileType::PackageMap).unwrap()
         };
 
         let package_offset_option =
@@ -108,7 +108,7 @@
         // SAFETY:
         // The safety here is ensured as the test process will not write to temp storage file
         let flag_mapped_file =
-            unsafe { get_mapped_file(&pb_file_path, "system", StorageFileType::FlagMap).unwrap() };
+            unsafe { get_mapped_file(&pb_file_path, "mockup", StorageFileType::FlagMap).unwrap() };
 
         let baseline = vec![
             (0, "enabled_ro", 1u16),
@@ -134,7 +134,7 @@
         // SAFETY:
         // The safety here is ensured as the test process will not write to temp storage file
         let flag_mapped_file =
-            unsafe { get_mapped_file(&pb_file_path, "system", StorageFileType::FlagMap).unwrap() };
+            unsafe { get_mapped_file(&pb_file_path, "mockup", StorageFileType::FlagMap).unwrap() };
         let flag_offset_option = get_flag_offset(&flag_mapped_file, 0, "none_exist").unwrap();
         assert_eq!(flag_offset_option, None);
 
@@ -149,8 +149,8 @@
         // SAFETY:
         // The safety here is ensured as the test process will not write to temp storage file
         let flag_value_file =
-            unsafe { get_mapped_file(&pb_file_path, "system", StorageFileType::FlagVal).unwrap() };
-        let baseline: Vec<bool> = vec![false; 8];
+            unsafe { get_mapped_file(&pb_file_path, "mockup", StorageFileType::FlagVal).unwrap() };
+        let baseline: Vec<bool> = vec![false, true, true, false, true, true, true, true];
         for (offset, expected_value) in baseline.into_iter().enumerate() {
             let flag_value = get_boolean_flag_value(&flag_value_file, offset as u32).unwrap();
             assert_eq!(flag_value, expected_value);
@@ -164,7 +164,7 @@
         // SAFETY:
         // The safety here is ensured as the test process will not write to temp storage file
         let flag_value_file =
-            unsafe { get_mapped_file(&pb_file_path, "system", StorageFileType::FlagVal).unwrap() };
+            unsafe { get_mapped_file(&pb_file_path, "mockup", StorageFileType::FlagVal).unwrap() };
         let err = get_boolean_flag_value(&flag_value_file, 8u32).unwrap_err();
         assert_eq!(
             format!("{:?}", err),
diff --git a/tools/aconfig/aconfig_storage_write_api/aconfig_storage_write_api.cpp b/tools/aconfig/aconfig_storage_write_api/aconfig_storage_write_api.cpp
index e863c0e..e5155a4 100644
--- a/tools/aconfig/aconfig_storage_write_api/aconfig_storage_write_api.cpp
+++ b/tools/aconfig/aconfig_storage_write_api/aconfig_storage_write_api.cpp
@@ -62,7 +62,7 @@
   }
 
   if ((file_stat.st_mode & (S_IWUSR | S_IWGRP | S_IWOTH)) == 0) {
-    return ErrnoError() << "cannot map nonwriteable file";
+    return Error() << "cannot map nonwriteable file";
   }
 
   size_t file_size = file_stat.st_size;
diff --git a/tools/aconfig/aconfig_storage_write_api/tests/flag.val b/tools/aconfig/aconfig_storage_write_api/tests/flag.val
index 75b8564..ed203d4 100644
--- a/tools/aconfig/aconfig_storage_write_api/tests/flag.val
+++ b/tools/aconfig/aconfig_storage_write_api/tests/flag.val
Binary files differ
diff --git a/tools/aconfig/aconfig_storage_write_api/tests/storage_write_api_test.cpp b/tools/aconfig/aconfig_storage_write_api/tests/storage_write_api_test.cpp
index 3a1c5de..00b737c 100644
--- a/tools/aconfig/aconfig_storage_write_api/tests/storage_write_api_test.cpp
+++ b/tools/aconfig/aconfig_storage_write_api/tests/storage_write_api_test.cpp
@@ -55,7 +55,7 @@
     auto proto = storage_files();
     auto* info = proto.add_files();
     info->set_version(0);
-    info->set_container("system");
+    info->set_container("mockup");
     info->set_package_map("some_package.map");
     info->set_flag_map("some_flag.map");
     info->set_flag_val(flag_val);
@@ -97,15 +97,16 @@
 TEST_F(AconfigStorageTest, test_non_writable_storage_file_mapping) {
   ASSERT_TRUE(chmod(flag_val.c_str(), S_IRUSR | S_IRGRP | S_IROTH) != -1);
   auto mapped_file_result = private_api::get_mapped_flag_value_file_impl(
-      storage_record_pb, "system");
+      storage_record_pb, "mockup");
   ASSERT_FALSE(mapped_file_result.ok());
-  ASSERT_EQ(mapped_file_result.error().message(), "cannot map nonwriteable file");
+  auto it = mapped_file_result.error().message().find("cannot map nonwriteable file");
+  ASSERT_TRUE(it != std::string::npos) << mapped_file_result.error().message();
 }
 
 /// Test to lock down storage flag value update api
 TEST_F(AconfigStorageTest, test_boolean_flag_value_update) {
   auto mapped_file_result = private_api::get_mapped_flag_value_file_impl(
-      storage_record_pb, "system");
+      storage_record_pb, "mockup");
   ASSERT_TRUE(mapped_file_result.ok());
   auto mapped_file = *mapped_file_result;
 
@@ -124,7 +125,7 @@
 /// Negative test to lock down the error when querying flag value out of range
 TEST_F(AconfigStorageTest, test_invalid_boolean_flag_value_update) {
   auto mapped_file_result = private_api::get_mapped_flag_value_file_impl(
-      storage_record_pb, "system");
+      storage_record_pb, "mockup");
   ASSERT_TRUE(mapped_file_result.ok());
   auto mapped_file = *mapped_file_result;
   auto update_result = api::set_boolean_flag_value(mapped_file, 8, true);
diff --git a/tools/aconfig/aconfig_storage_write_api/tests/storage_write_api_test.rs b/tools/aconfig/aconfig_storage_write_api/tests/storage_write_api_test.rs
index f6c1bbc..4bda54c 100644
--- a/tools/aconfig/aconfig_storage_write_api/tests/storage_write_api_test.rs
+++ b/tools/aconfig/aconfig_storage_write_api/tests/storage_write_api_test.rs
@@ -15,7 +15,7 @@
             r#"
 files {{
     version: 0
-    container: "system"
+    container: "mockup"
     package_map: "some_package_map"
     flag_map: "some_flag_map"
     flag_val: "{}"
@@ -59,7 +59,7 @@
         // SAFETY:
         // The safety here is ensured as only this single threaded test process will
         // write to this file
-        let mut file = unsafe { get_mapped_file(&record_pb_path, "system").unwrap() };
+        let mut file = unsafe { get_mapped_file(&record_pb_path, "mockup").unwrap() };
         for i in 0..8 {
             set_boolean_flag_value(&mut file, i, true).unwrap();
             let value = get_boolean_flag_value_at_offset(&flag_value_path, i);
diff --git a/tools/aconfig/aflags/src/aconfig_storage_source.rs b/tools/aconfig/aflags/src/aconfig_storage_source.rs
index 1d73688..a3ca221 100644
--- a/tools/aconfig/aflags/src/aconfig_storage_source.rs
+++ b/tools/aconfig/aflags/src/aconfig_storage_source.rs
@@ -27,7 +27,7 @@
             let container =
                 file_info.container.ok_or(anyhow!("storage file is missing container"))?;
 
-            for (package, name, val) in
+            for (package, name, _flag_type, val) in
                 aconfig_storage_file::list_flags(&package_map, &flag_map, &flag_val)?
             {
                 result.push(Flag {
diff --git a/tools/finalization/OWNERS b/tools/finalization/OWNERS
index 518b60d..b00b774 100644
--- a/tools/finalization/OWNERS
+++ b/tools/finalization/OWNERS
@@ -1,5 +1,7 @@
 include platform/build/soong:/OWNERS
-smoreland@google.com
-alexbuy@google.com
+amhk@google.com
+gurpreetgs@google.com
+michaelwr@google.com
 patb@google.com
+smoreland@google.com
 zyy@google.com
diff --git a/tools/protos/metadata_file.proto b/tools/protos/metadata_file.proto
index 47562c5..5c89618 100644
--- a/tools/protos/metadata_file.proto
+++ b/tools/protos/metadata_file.proto
@@ -282,7 +282,7 @@
   optional string element_id = 3;
 }
 
-// Identifier for a third-package package.
+// Identifier for a third-party package.
 // See go/tp-metadata-id.
 message Identifier {
   // The type of the identifier. Either an "ecosystem" value from
@@ -338,7 +338,19 @@
   //  - "PrebuiltByAlphabet": This type should be used for archives of primarily
   //  Google-owned source code (may contain non-Google-owned dependencies),
   //  which has been built using production Google infrastructure, and copied
-  //  into third_party.
+  //  into Android. The "value" field is the URL of the prebuilt artifact or
+  //  the relative path of the artifact to the root of a package.
+  //  Example:
+  //    identifier {
+  //      type: "PrebuiltByAlphabet",
+  //      version: "1",
+  //      value: "v1/arm84_hdpi.apk",
+  //    }
+  //    identifier {
+  //      type: "PrebuiltByAlphabet",
+  //      version: "2",
+  //      value: "v2/x86_64_xhdpi.apk",
+  //    }
   //
   //  - "LocalSource": The "value" field is the URL identifying where the local
   //  copy of the package source code can be found.