Releasing the former Stadia file transfer tools

The tools allow efficient and fast synchronization of large directory
trees from a Windows workstation to a Linux target machine.

cdc_rsync* support efficient copy of files by using content-defined
chunking (CDC) to identify chunks within files that can be reused.

asset_stream_manager + cdc_fuse_fs support efficient streaming of a
local directory to a remote virtual file system based on FUSE. It also
employs CDC to identify and reuse unchanged data chunks.

cdc_fuse_fs/BUILD

@@ -0,0 +1,136 @@
+package(default_visibility = ["//:__subpackages__"])
+
+cc_binary(
+    name = "cdc_fuse_fs",
+    srcs = ["main.cc"],
+    deps = [
+        ":cdc_fuse_fs_lib",
+        ":constants",
+        "//absl_helper:jedec_size_flag",
+        "//common:gamelet_component",
+        "//common:log",
+        "//data_store:data_provider",
+        "//data_store:disk_data_store",
+        "//data_store:grpc_reader",
+        "@com_google_absl//absl/flags:parse",
+    ],
+)
+
+# Dependencies for cdc_fuse_fs_lib, except for FUSE.
+cdc_fuse_fs_lib_shared_deps = [
+    ":asset",
+    ":asset_stream_client",
+    ":config_stream_client",
+    "//common:log",
+    "//common:path",
+    "//common:platform",
+    "//common:util",
+    "//common:threadpool",
+    "@com_github_jsoncpp//:jsoncpp",
+]
+
+cc_library(
+    name = "cdc_fuse_fs_lib",
+    srcs = ["cdc_fuse_fs.cc"],
+    hdrs = ["cdc_fuse_fs.h"],
+    target_compatible_with = ["@platforms//os:linux"],
+    deps = cdc_fuse_fs_lib_shared_deps + ["@com_github_fuse//:fuse_shared"],
+)
+
+cc_library(
+    name = "cdc_fuse_fs_lib_mocked",
+    srcs = ["cdc_fuse_fs.cc"],
+    hdrs = ["cdc_fuse_fs.h"],
+    copts = ["-DUSE_MOCK_LIBFUSE=1"],
+    deps = cdc_fuse_fs_lib_shared_deps + [":mock_libfuse"],
+)
+
+cc_test(
+    name = "cdc_fuse_fs_test",
+    srcs = ["cdc_fuse_fs_test.cc"],
+    deps = [
+        ":cdc_fuse_fs_lib_mocked",
+        "//common:status_test_macros",
+        "//data_store",
+        "//data_store:mem_data_store",
+        "//manifest:fake_manifest_builder",
+        "//manifest:manifest_builder",
+        "@com_google_absl//absl/status",
+        "@com_google_googletest//:gtest",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
+
+cc_library(
+    name = "mock_libfuse",
+    srcs = ["mock_libfuse.cc"],
+    hdrs = ["mock_libfuse.h"],
+    deps = ["//common:platform"],
+)
+
+cc_library(
+    name = "constants",
+    hdrs = ["constants.h"],
+)
+
+cc_library(
+    name = "asset_stream_client",
+    srcs = ["asset_stream_client.cc"],
+    hdrs = ["asset_stream_client.h"],
+    deps = [
+        "//common:log",
+        "//common:status_macros",
+        "//common:stopwatch",
+        "//manifest:manifest_proto_defs",
+        "//proto:asset_stream_service_grpc_proto",
+        "@com_google_absl//absl/status:statusor",
+    ],
+)
+
+cc_library(
+    name = "asset",
+    srcs = ["asset.cc"],
+    hdrs = ["asset.h"],
+    deps = [
+        "//common:buffer",
+        "//common:status",
+        "//data_store",
+        "//manifest:content_id",
+        "@com_google_absl//absl/status",
+        "@com_google_absl//absl/status:statusor",
+        "@com_google_absl//absl/strings",
+        "@com_google_absl//absl/synchronization",
+    ],
+)
+
+cc_test(
+    name = "asset_test",
+    srcs = ["asset_test.cc"],
+    deps = [
+        ":asset",
+        "//common:path",
+        "//common:platform",
+        "//common:status_test_macros",
+        "//data_store:mem_data_store",
+        "@com_google_googletest//:gtest",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
+
+cc_library(
+    name = "config_stream_client",
+    srcs = ["config_stream_client.cc"],
+    hdrs = ["config_stream_client.h"],
+    deps = [
+        "//common:grpc_status",
+        "//common:log",
+        "//manifest:content_id",
+        "//proto:asset_stream_service_grpc_proto",
+        "@com_google_absl//absl/status",
+    ],
+)
+
+filegroup(
+    name = "all_test_sources",
+    srcs = glob(["*_test.cc"]),
+)