add s3 file system

CMakeLists.txt

@@ -32,6 +32,7 @@ include(cmake/third_party_absl.cmake)
 include(cmake/third_party_pybind11.cmake)
 include(cmake/third_party_zstd.cmake)
 include(cmake/third_party_gcs.cmake)
+include(cmake/third_party_aws.cmake)
 
 # Restore original CXX_FLAGS
 set(CMAKE_CXX_FLAGS "${SAVED_CMAKE_CXX_FLAGS}")
@@ -107,6 +108,27 @@ bagz_cc_library(
     google-cloud-cpp::storage
 )
 
+file(GLOB bagz_file_system_s3_sources "src/file/file_systems/s3/*.cc")
+file(GLOB bagz_file_system_s3_headers "src/file/file_systems/s3/*.h")
+
+bagz_cc_library(
+  bagz_file_system_s3
+  SOURCES ${bagz_file_system_s3_sources}
+  HEADERS ${bagz_file_system_s3_headers}
+  DEPS
+    absl::log
+    absl::status
+    absl::statusor
+    absl::strings
+    bagz_file_system
+    bagz_internal
+    aws-cpp-sdk-s3
+    aws-cpp-sdk-core
+    GTest::gtest
+    GTest::gtest_main
+    GTest::gmock
+)
+
 file(GLOB bagz_file_sources "src/file/*.cc"  "src/file/registry/*.cc")
 file(GLOB bagz_file_headers "src/file/*.h" "src/file/registry/*.h")
 
@@ -123,7 +145,10 @@ bagz_cc_library(
     bagz_file_system
     bagz_file_system_posix
     bagz_file_system_gcs
+    bagz_file_system_s3
     google-cloud-cpp::storage
+    aws-cpp-sdk-s3
+    aws-cpp-sdk-core
 )
 
 file(GLOB bagz_core_sources "src/*.cc")

cmake/third_party_aws.cmake

@@ -0,0 +1,45 @@
+# Copyright 2025 Google LLC
+#
+# 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.
+
+# Disable testing.
+set(BUILD_TESTING OFF)
+set(ENABLE_TESTING OFF)
+
+# Only build S3 client
+set(BUILD_ONLY "s3" CACHE STRING "")
+
+# Disable shared libraries
+set(BUILD_SHARED_LIBS OFF CACHE BOOL "")
+
+FetchContent_Declare(
+  aws-sdk-cpp
+  GIT_REPOSITORY https://github.com/aws/aws-sdk-cpp.git
+  GIT_TAG 1.11.400 # Latest stable version
+  GIT_SHALLOW TRUE
+  EXCLUDE_FROM_ALL
+)
+
+FetchContent_MakeAvailable(aws-sdk-cpp)
+
+FetchContent_Declare(
+  googletest
+  GIT_REPOSITORY https://github.com/google/googletest.git
+  GIT_TAG        v1.17.0
+)
+
+set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
+
+if (NOT TARGET GTest::gtest)
+  FetchContent_MakeAvailable(googletest)
+endif()