[cdc_stream] Add a CLI client to start/stop asset streaming sessions (#4)

Implements the cdc_stream client and adjusts asset streaming in various places to work better outside of a GGP environment. This CL tries to get quoting for SSH commands right. It also brings back the ability to start a streaming session from asset_stream_manager. Also cleans up Bazel targets setup. Since the sln file is now in root, it is no longer necessary to prepend ../ to relative filenames to make clicking on errors work.
2026-01-30 08:55:36 +02:00 · 2022-11-18 10:59:42 +01:00
parent ca84d3dd2e
commit 269fb2be45
38 changed files with 797 additions and 356 deletions
--- a/NMakeBazelProject.targets
+++ b/NMakeBazelProject.targets
@@ -6,8 +6,6 @@
       Usage: Define 4 properties in your project file:
                BazelTargets:          Labels of Bazel targets to build, e.g. //common:status.
                BazelOutputFile:       Output filename, e.g. cdc_rsync.exe
-                BazelSourcePathPrefix: Prefix for source paths, to translate paths relative to (/foo) to project-relative paths (../foo).
-                                       Must be escaped for sed (e.g. / -> \/), e.g. ..\/..\/..\/
              Optionally, define:
                BazelIncludePaths:     Include paths, used for Intellisense.
              Import NMakeCMakeProject.targets. -->
@@ -16,7 +14,6 @@
  <Target Name="CheckProperties" BeforeTargets="PrepareForNMakeBuild">
    <Error Condition="'$(BazelTargets)' == ''" Text="Please define property BazelTargets" />
    <Error Condition="'$(BazelOutputFile)' == ''" Text="Please define property BazelOutputFile" />
-    <Error Condition="'$(BazelSourcePathPrefix)' == ''" Text="Please define property BazelSourcePathPrefix" />
  </Target>

  <!-- Define Bazel properties. -->
@@ -27,15 +24,10 @@
    <BazelPlatformDir Condition="'$(Platform)'=='GGP'">k8</BazelPlatformDir>
    <BazelCompilationMode Condition="'$(Configuration)'=='Debug'">dbg</BazelCompilationMode>
    <BazelCompilationMode Condition="'$(Configuration)'=='Release'">opt</BazelCompilationMode>
-    <!-- The sed command converts repo-relative paths (/path/to/foo) to project-relative paths (../path/to/foo), so that errors etc. can be clicked in VS.
-         Matches foo:31:8: bar, foo(31): bar, foo(31,32): bar -->
-    <BazelSedCommand>| sed -r &quot;s/^([^:\(]+[:\(][[:digit:]]+(,[[:digit:]]+)?[:\)])/$(BazelSourcePathPrefix)\\1/&quot;</BazelSedCommand>
-    <!-- Clang prints errors to stderr, so pipe it into stdout. -->
-    <BazelSedCommand Condition="'$(Platform)'=='GGP'">2&gt;&amp;1 $(BazelSedCommand)</BazelSedCommand>
    <BazelArgs>--config=$(BazelPlatform)</BazelArgs>
    <BazelArgs Condition="'$(Configuration)|$(Platform)'=='Release|GGP'">$(BazelArgs) --linkopt=-Wl,--strip-all</BazelArgs>
    <!-- Prevent protobuf recompilation (protobuf is written to "host" by default for both x84 and ggp, causing recompiles). -->
-    <BazelArgs Condition="'$(Platform)'=='x64'">$(BazelArgs) --distinct_host_configuration=false</BazelArgs>
+    <!-- <BazelArgs Condition="'$(Platform)'=='x64'">$(BazelArgs) - -distinct_host_configuration=false</BazelArgs> -->
    <!-- Windows uses /LTCG (link-time code generation), but no /GL (global optimization), which is a requirement for that. -->
    <BazelArgs Condition="'$(Configuration)|$(Platform)'=='Release|x64'">$(BazelArgs) --copt=/GL</BazelArgs>
    <!-- Strip unused symbols on GGP. -->
@@ -51,9 +43,9 @@
  <!-- Define NMake properties. -->
  <PropertyGroup>
    <NMakeIncludeSearchPath>$(SolutionDir)..\..\bazel-out\$(BazelPlatformDir)-$(BazelCompilationMode)\bin;$(BazelIncludePaths)</NMakeIncludeSearchPath>
-    <NMakeBuildCommandLine>$(RmBazelOutDir) bazel build --compilation_mode=$(BazelCompilationMode) $(BazelArgs) $(BazelTargets) $(BazelSedCommand) $(MakeRW)</NMakeBuildCommandLine>
+    <NMakeBuildCommandLine>$(RmBazelOutDir) bazel build --compilation_mode=$(BazelCompilationMode) $(BazelArgs) $(BazelTargets) $(MakeRW)</NMakeBuildCommandLine>
    <NMakeCleanCommandLine>$(RmBazelOutDir) bazel clean</NMakeCleanCommandLine>
-    <NMakeReBuildCommandLine>$(RmBazelOutDir) bazel clean &amp;&amp; bazel build --compilation_mode=$(BazelCompilationMode) $(BazelArgs) $(BazelTargets) $(BazelSedCommand) $(MakeRW)</NMakeReBuildCommandLine>
+    <NMakeReBuildCommandLine>$(RmBazelOutDir) bazel clean &amp;&amp; bazel build --compilation_mode=$(BazelCompilationMode) $(BazelArgs) $(BazelTargets) $(MakeRW)</NMakeReBuildCommandLine>
    <NMakeOutput>$(OutDir)$(BazelOutputFile)</NMakeOutput>
  </PropertyGroup>
 </Project>
--- a/all_files.vcxitems
+++ b/all_files.vcxitems
@@ -28,6 +28,7 @@
    <ClCompile Include="$(MSBuildThisFileDirectory)asset_stream_manager\multi_session_test.cc" />
    <ClCompile Include="$(MSBuildThisFileDirectory)asset_stream_manager\session.cc" />
    <ClCompile Include="$(MSBuildThisFileDirectory)asset_stream_manager\session_management_server.cc" />
+    <ClCompile Include="$(MSBuildThisFileDirectory)asset_stream_manager\session_manager.cc" />
    <ClCompile Include="$(MSBuildThisFileDirectory)asset_stream_manager\testing_asset_stream_server.cc" />
    <ClCompile Include="$(MSBuildThisFileDirectory)cdc_fuse_fs\asset.cc" />
    <ClCompile Include="$(MSBuildThisFileDirectory)cdc_fuse_fs\asset_stream_client.cc" />
@@ -39,6 +40,8 @@
    <ClCompile Include="$(MSBuildThisFileDirectory)cdc_fuse_fs\mock_libfuse.cc" />
    <ClCompile Include="$(MSBuildThisFileDirectory)cdc_indexer\indexer.cc" />
    <ClCompile Include="$(MSBuildThisFileDirectory)cdc_indexer\main.cc" />
+    <ClCompile Include="$(MSBuildThisFileDirectory)cdc_stream\local_assets_stream_manager_client.cc" />
+    <ClCompile Include="$(MSBuildThisFileDirectory)cdc_stream\main.cc" />
    <ClCompile Include="$(MSBuildThisFileDirectory)common\buffer.cc" />
    <ClCompile Include="$(MSBuildThisFileDirectory)common\buffer_test.cc" />
    <ClCompile Include="$(MSBuildThisFileDirectory)common\clock.cc" />
@@ -150,6 +153,7 @@
    <ClInclude Include="$(MSBuildThisFileDirectory)asset_stream_manager\session.h" />
    <ClInclude Include="$(MSBuildThisFileDirectory)asset_stream_manager\session_config.h" />
    <ClInclude Include="$(MSBuildThisFileDirectory)asset_stream_manager\session_management_server.h" />
+    <ClInclude Include="$(MSBuildThisFileDirectory)asset_stream_manager\session_manager.h" />
    <ClInclude Include="$(MSBuildThisFileDirectory)asset_stream_manager\testing_asset_stream_server.h" />
    <ClInclude Include="$(MSBuildThisFileDirectory)cdc_fuse_fs\asset.h" />
    <ClInclude Include="$(MSBuildThisFileDirectory)cdc_fuse_fs\asset_stream_client.h" />
@@ -158,6 +162,7 @@
    <ClInclude Include="$(MSBuildThisFileDirectory)cdc_fuse_fs\constants.h" />
    <ClInclude Include="$(MSBuildThisFileDirectory)cdc_fuse_fs\mock_libfuse.h" />
    <ClInclude Include="$(MSBuildThisFileDirectory)cdc_indexer\indexer.h" />
+    <ClInclude Include="$(MSBuildThisFileDirectory)cdc_stream\local_assets_stream_manager_client.h" />
    <ClInclude Include="$(MSBuildThisFileDirectory)common\buffer.h" />
    <ClInclude Include="$(MSBuildThisFileDirectory)common\clock.h" />
    <ClInclude Include="$(MSBuildThisFileDirectory)common\dir_iter.h" />
@@ -237,6 +242,7 @@
    <None Include="$(MSBuildThisFileDirectory)cdc_indexer\BUILD" />
    <None Include="$(MSBuildThisFileDirectory)cdc_indexer\README.md" />
    <None Include="$(MSBuildThisFileDirectory)cdc_rsync\protos\BUILD" />
+    <None Include="$(MSBuildThisFileDirectory)cdc_stream\BUILD" />
    <None Include="$(MSBuildThisFileDirectory)common\BUILD" />
    <None Include="$(MSBuildThisFileDirectory)data_store\BUILD" />
    <None Include="$(MSBuildThisFileDirectory)cdc_rsync\base\BUILD" />
--- a/asset_stream_manager/BUILD
+++ b/asset_stream_manager/BUILD
@@ -9,6 +9,7 @@ cc_binary(
    deps = [
        ":asset_stream_config",
        ":session_management_server",
+        "//cdc_stream",
        "//common:log",
        "//common:path",
        "//common:sdk_util",
--- a/asset_stream_manager/asset_stream_config.cc
+++ b/asset_stream_manager/asset_stream_config.cc
@@ -26,9 +26,6 @@
 #include "common/status_macros.h"
 #include "json/json.h"

-ABSL_DECLARE_FLAG(std::string, src_dir);
-ABSL_DECLARE_FLAG(std::string, instance_ip);
-ABSL_DECLARE_FLAG(uint16_t, instance_port);
 ABSL_DECLARE_FLAG(int, verbosity);
 ABSL_DECLARE_FLAG(bool, debug);
 ABSL_DECLARE_FLAG(bool, singlethreaded);
@@ -42,6 +39,14 @@ ABSL_DECLARE_FLAG(uint32_t, access_idle_timeout);
 ABSL_DECLARE_FLAG(int, manifest_updater_threads);
 ABSL_DECLARE_FLAG(int, file_change_wait_duration_ms);

+// Development flags.
+ABSL_DECLARE_FLAG(std::string, dev_src_dir);
+ABSL_DECLARE_FLAG(std::string, dev_user_host);
+ABSL_DECLARE_FLAG(uint16_t, dev_ssh_port);
+ABSL_DECLARE_FLAG(std::string, dev_ssh_command);
+ABSL_DECLARE_FLAG(std::string, dev_scp_command);
+ABSL_DECLARE_FLAG(std::string, dev_mount_dir);
+
 // Declare AS20 flags, so that AS30 can be used on older SDKs simply by
 // replacing the binary. Note that the RETIRED_FLAGS macro can't be used
 // because the flags contain dashes. This code mimics the macro.
@@ -62,9 +67,6 @@ const auto RETIRED_FLAGS_REG_allow_edge =
 namespace cdc_ft {

 AssetStreamConfig::AssetStreamConfig() {
-  src_dir_ = absl::GetFlag(FLAGS_src_dir);
-  instance_ip_ = absl::GetFlag(FLAGS_instance_ip);
-  instance_port_ = absl::GetFlag(FLAGS_instance_port);
  session_cfg_.verbosity = absl::GetFlag(FLAGS_verbosity);
  session_cfg_.fuse_debug = absl::GetFlag(FLAGS_debug);
  session_cfg_.fuse_singlethreaded = absl::GetFlag(FLAGS_singlethreaded);
@@ -80,6 +82,13 @@ AssetStreamConfig::AssetStreamConfig() {
      absl::GetFlag(FLAGS_manifest_updater_threads);
  session_cfg_.file_change_wait_duration_ms =
      absl::GetFlag(FLAGS_file_change_wait_duration_ms);
+
+  dev_src_dir_ = absl::GetFlag(FLAGS_dev_src_dir);
+  dev_target_.user_host = absl::GetFlag(FLAGS_dev_user_host);
+  dev_target_.ssh_port = absl::GetFlag(FLAGS_dev_ssh_port);
+  dev_target_.ssh_command = absl::GetFlag(FLAGS_dev_ssh_command);
+  dev_target_.scp_command = absl::GetFlag(FLAGS_dev_scp_command);
+  dev_target_.mount_dir = absl::GetFlag(FLAGS_dev_mount_dir);
 }

 AssetStreamConfig::~AssetStreamConfig() = default;
@@ -105,7 +114,6 @@ absl::Status AssetStreamConfig::LoadFromFile(const std::string& path) {
    }                                      \
  } while (0)

-  ASSIGN_VAR(src_dir_, src_dir, String);
  ASSIGN_VAR(session_cfg_.verbosity, verbosity, Int);
  ASSIGN_VAR(session_cfg_.fuse_debug, debug, Bool);
  ASSIGN_VAR(session_cfg_.fuse_singlethreaded, singlethreaded, Bool);
@@ -144,7 +152,6 @@ absl::Status AssetStreamConfig::LoadFromFile(const std::string& path) {

 std::string AssetStreamConfig::ToString() {
  std::ostringstream ss;
-  ss << "src_dir                      = " << src_dir_ << std::endl;
  ss << "verbosity                    = " << session_cfg_.verbosity
     << std::endl;
  ss << "debug                        = " << session_cfg_.fuse_debug
@@ -166,6 +173,14 @@ std::string AssetStreamConfig::ToString() {
     << session_cfg_.manifest_updater_threads << std::endl;
  ss << "file_change_wait_duration_ms = "
     << session_cfg_.file_change_wait_duration_ms << std::endl;
+  ss << "dev_src_dir                  = " << dev_src_dir_ << std::endl;
+  ss << "dev_user_host                = " << dev_target_.user_host << std::endl;
+  ss << "dev_ssh_port                 = " << dev_target_.ssh_port << std::endl;
+  ss << "dev_ssh_command              = " << dev_target_.ssh_command
+     << std::endl;
+  ss << "dev_scp_command              = " << dev_target_.scp_command
+     << std::endl;
+  ss << "dev_mount_dir                = " << dev_target_.mount_dir << std::endl;
  return ss.str();
 }

--- a/asset_stream_manager/asset_stream_config.h
+++ b/asset_stream_manager/asset_stream_config.h
@@ -23,6 +23,7 @@

 #include "absl/status/status.h"
 #include "asset_stream_manager/session_config.h"
+#include "session.h"

 namespace cdc_ft {

@@ -38,7 +39,6 @@ class AssetStreamConfig {
  // Loads a configuration from the JSON file at |path| and overrides any config
  // values that are set in this file. Sample json file:
  // {
-  //   "src_dir":"C:\\path\\to\\assets",
  //   "verbosity":3,
  //   "debug":0,
  //   "singlethreaded":0,
@@ -67,34 +67,29 @@ class AssetStreamConfig {
  // read from the JSON file.
  std::string GetFlagReadErrors();

-  // Workstation directory to stream. Should usually be empty since mounts are
-  // triggered by the CLI or the partner portal via a gRPC call, but useful
-  // during development.
-  const std::string& src_dir() const { return src_dir_; }
-
-  // IP address of the instance to stream to. Should usually be empty since
-  // mounts are triggered by the CLI or the partner portal via a gRPC call, but
-  // useful during development.
-  const std::string& instance_ip() const { return instance_ip_; }
-
-  // IP address of the instance to stream to. Should usually be unset (0) since
-  // mounts are triggered by the CLI or the partner portal via a gRPC call, but
-  // useful during development.
-  const uint16_t instance_port() const { return instance_port_; }
-
  // Session configuration.
-  const SessionConfig session_cfg() const { return session_cfg_; }
+  const SessionConfig& session_cfg() const { return session_cfg_; }
+
+  // Workstation directory to be streamed. Used for development purposes only
+  // to start a session right away when the service starts up. See dev CLI args.
+  const std::string& dev_src_dir() const { return dev_src_dir_; }
+
+  // Session target. Used for development purposes only to start a session right
+  // away when the service starts up. See dev CLI args.
+  const SessionTarget& dev_target() const { return dev_target_; }

  // Whether to log to a file or to stdout.
  bool log_to_stdout() const { return log_to_stdout_; }

 private:
-  std::string src_dir_;
-  std::string instance_ip_;
-  uint16_t instance_port_ = 0;
  SessionConfig session_cfg_;
  bool log_to_stdout_ = false;

+  // Configuration used for development. Allows users to specify a session
+  // via the service's command line.
+  std::string dev_src_dir_;
+  SessionTarget dev_target_;
+
  // Use a set, so the flags are sorted alphabetically.
  std::set<std::string> flags_read_from_file_;

--- a/asset_stream_manager/asset_stream_manager.vcxproj
+++ b/asset_stream_manager/asset_stream_manager.vcxproj
@@ -66,10 +66,9 @@
  </ItemDefinitionGroup>
  <!-- Bazel setup -->
  <PropertyGroup>
-    <BazelTargets>//asset_stream_manager</BazelTargets>
+    <BazelTargets>//asset_stream_manager //cdc_stream</BazelTargets>
    <BazelOutputFile>asset_stream_manager.exe</BazelOutputFile>
    <BazelIncludePaths>..\;..\third_party\absl;..\third_party\jsoncpp\include;..\third_party\blake3\c;..\third_party\googletest\googletest\include;..\third_party\protobuf\src;..\third_party\grpc\include;..\bazel-out\x64_windows-dbg\bin;$(VC_IncludePath);$(WindowsSDK_IncludePath)</BazelIncludePaths>
-    <BazelSourcePathPrefix>..\/</BazelSourcePathPrefix>
  </PropertyGroup>
  <Import Project="..\NMakeBazelProject.targets" />
  <!-- For some reason, msbuild doesn't include this file, so copy it explicitly. -->
--- a/asset_stream_manager/cdc_fuse_manager.cc
+++ b/asset_stream_manager/cdc_fuse_manager.cc
@@ -29,13 +29,10 @@ namespace {
 constexpr char kFuseFilename[] = "cdc_fuse_fs";
 constexpr char kLibFuseFilename[] = "libfuse.so";
 constexpr char kFuseStdoutPrefix[] = "cdc_fuse_fs_stdout";
-constexpr char kRemoteToolsBinDir[] = "~/.cache/cdc_file_transfer/";
-
-// Mount point for FUSE on the gamelet.
-constexpr char kMountDir[] = "/mnt/workstation";
+constexpr char kRemoteToolsBinDir[] = "~/.cache/cdc-file-transfer/bin/";

 // Cache directory on the gamelet to store data chunks.
-constexpr char kCacheDir[] = "/var/cache/asset_streaming";
+constexpr char kCacheDir[] = "~/.cache/cdc-file-transfer/chunks";

 }  // namespace

@@ -56,23 +53,14 @@ absl::Status CdcFuseManager::Deploy() {
  std::string exe_dir;
  RETURN_IF_ERROR(path::GetExeDir(&exe_dir), "Failed to get exe directory");

-  std::string local_exe_path = path::Join(exe_dir, kFuseFilename);
-  std::string local_lib_path = path::Join(exe_dir, kLibFuseFilename);
+  // Set the cwd to the exe dir and pass the filenames to scp. Otherwise, some
+  // scp implementations can get confused and create the wrong remote filenames.
+  path::SetCwd(exe_dir);

-#ifdef _DEBUG
-  // Sync FUSE to the gamelet in debug. Debug builds are rather large, so
-  // there's a gain from using sync.
-  LOG_DEBUG("Syncing FUSE");
-  RETURN_IF_ERROR(
-      remote_util_->Sync({local_exe_path, local_lib_path}, kRemoteToolsBinDir),
-      "Failed to sync FUSE to gamelet");
-  LOG_DEBUG("Syncing FUSE succeeded");
-#else
-  // Copy FUSE to the gamelet. This is usually faster in production since it
-  // doesn't have to deploy ggp__server first.
+  // Copy FUSE to the gamelet.
  LOG_DEBUG("Copying FUSE");
-  RETURN_IF_ERROR(remote_util_->Scp({local_exe_path, local_lib_path},
-                                    kRemoteToolsBinDir, true),
+  RETURN_IF_ERROR(remote_util_->Scp({kFuseFilename, kLibFuseFilename},
+                                    kRemoteToolsBinDir, /*compress=*/false),
                  "Failed to copy FUSE to gamelet");
  LOG_DEBUG("Copying FUSE succeeded");

@@ -82,12 +70,12 @@ absl::Status CdcFuseManager::Deploy() {
  RETURN_IF_ERROR(remote_util_->Chmod("a+x", remotePath),
                  "Failed to set executable flag on FUSE");
  LOG_DEBUG("Making FUSE succeeded");
-#endif

  return absl::OkStatus();
 }

-absl::Status CdcFuseManager::Start(uint16_t local_port, uint16_t remote_port,
+absl::Status CdcFuseManager::Start(const std::string& mount_dir,
+                                   uint16_t local_port, uint16_t remote_port,
                                   int verbosity, bool debug,
                                   bool singlethreaded, bool enable_stats,
                                   bool check, uint64_t cache_capacity,
@@ -115,15 +103,18 @@ absl::Status CdcFuseManager::Start(uint16_t local_port, uint16_t remote_port,
  // Build the remote command.
  std::string remotePath = path::JoinUnix(kRemoteToolsBinDir, kFuseFilename);
  std::string remote_command = absl::StrFormat(
-      "LD_LIBRARY_PATH=%s %s --instance='%s' "
-      "--components='%s' --port=%i --cache_dir=%s "
+      "mkdir -p %s; LD_LIBRARY_PATH=%s %s "
+      "--instance=%s "
+      "--components=%s --port=%i --cache_dir=%s "
      "--verbosity=%i --cleanup_timeout=%i --access_idle_timeout=%i --stats=%i "
      "--check=%i --cache_capacity=%u -- -o allow_root -o ro -o nonempty -o "
      "auto_unmount %s%s%s",
-      kRemoteToolsBinDir, remotePath, instance_, component_args, remote_port,
-      kCacheDir, verbosity, cleanup_timeout_sec, access_idle_timeout_sec,
-      enable_stats, check, cache_capacity, kMountDir, debug ? " -d" : "",
-      singlethreaded ? " -s" : "");
+      kRemoteToolsBinDir, kRemoteToolsBinDir, remotePath,
+      RemoteUtil::QuoteForSsh(instance_),
+      RemoteUtil::QuoteForSsh(component_args), remote_port, kCacheDir,
+      verbosity, cleanup_timeout_sec, access_idle_timeout_sec, enable_stats,
+      check, cache_capacity, RemoteUtil::QuoteForSsh(mount_dir),
+      debug ? " -d" : "", singlethreaded ? " -s" : "");

  bool needs_deploy = false;
  RETURN_IF_ERROR(
--- a/asset_stream_manager/cdc_fuse_manager.h
+++ b/asset_stream_manager/cdc_fuse_manager.h
@@ -40,6 +40,7 @@ class CdcFuseManager {
  // |remote_port| to the workstation's |local_port|. Deploys the binary if
  // necessary.
  //
+  // |mount_dir| is the remote directory where to mount the FUSE.
  // |verbosity| is the log verbosity used by the filesystem.
  // |debug| puts the filesystem into debug mode if set to true. This also
  // causes the process to run in the foreground, so that logs are piped through
@@ -51,10 +52,10 @@ class CdcFuseManager {
  // |cleanup_timeout_sec| defines the data provider cleanup timeout in seconds.
  // |access_idle_timeout_sec| defines the number of seconds after which data
  // provider is considered to be access-idling.
-  absl::Status Start(uint16_t local_port, uint16_t remote_port, int verbosity,
-                     bool debug, bool singlethreaded, bool enable_stats,
-                     bool check, uint64_t cache_capacity,
-                     uint32_t cleanup_timeout_sec,
+  absl::Status Start(const std::string& mount_dir, uint16_t local_port,
+                     uint16_t remote_port, int verbosity, bool debug,
+                     bool singlethreaded, bool enable_stats, bool check,
+                     uint64_t cache_capacity, uint32_t cleanup_timeout_sec,
                     uint32_t access_idle_timeout_sec);

  // Stops the CDC FUSE.
--- a/asset_stream_manager/local_assets_stream_manager_service_impl.cc
+++ b/asset_stream_manager/local_assets_stream_manager_service_impl.cc
@@ -17,6 +17,7 @@
 #include <iomanip>

 #include "absl/strings/str_format.h"
+#include "absl/strings/str_replace.h"
 #include "absl/strings/str_split.h"
 #include "asset_stream_manager/multi_session.h"
 #include "asset_stream_manager/session_manager.h"
@@ -26,11 +27,21 @@
 #include "common/process.h"
 #include "common/sdk_util.h"
 #include "common/status.h"
+#include "google/protobuf/text_format.h"
 #include "manifest/manifest_updater.h"

+using TextFormat = google::protobuf::TextFormat;
+
 namespace cdc_ft {
 namespace {

+std::string RequestToString(const google::protobuf::Message& request) {
+  std::string str;
+  google::protobuf::TextFormat::PrintToString(request, &str);
+  if (!str.empty() && str.back() == '\n') str.pop_back();
+  return absl::StrReplaceAll(str, {{"\n", ", "}});
+}
+
 // Parses |instance_name| of the form
 // "organizations/{org-id}/projects/{proj-id}/pools/{pool-id}/gamelets/{gamelet-id}"
 // into parts. The pool id is not returned.
@@ -102,48 +113,18 @@ LocalAssetsStreamManagerServiceImpl::~LocalAssetsStreamManagerServiceImpl() =
 grpc::Status LocalAssetsStreamManagerServiceImpl::StartSession(
    grpc::ServerContext* /*context*/, const StartSessionRequest* request,
    StartSessionResponse* /*response*/) {
-  LOG_INFO("RPC:StartSession(gamelet_name='%s', workstation_directory='%s'",
-           request->gamelet_name(), request->workstation_directory());
+  LOG_INFO("RPC:StartSession(%s)", RequestToString(*request));

-  metrics::DeveloperLogEvent evt;
-  evt.as_manager_data = std::make_unique<metrics::AssetStreamingManagerData>();
-  evt.as_manager_data->session_start_data =
-      std::make_unique<metrics::SessionStartData>();
-  evt.as_manager_data->session_start_data->absl_status = absl::StatusCode::kOk;
-  evt.as_manager_data->session_start_data->status =
-      metrics::SessionStartStatus::kOk;
-  evt.as_manager_data->session_start_data->origin =
-      ConvertOrigin(request->origin());
-
-  // Parse instance/project/org id.
-  absl::Status status;
  MultiSession* ms = nullptr;
-  std::string instance_id, project_id, organization_id, instance_ip;
-  uint16_t instance_port = 0;
-  if (!ParseInstanceName(request->gamelet_name(), &instance_id, &project_id,
-                         &organization_id)) {
-    status = absl::InvalidArgumentError(absl::StrFormat(
-        "Failed to parse instance name '%s'", request->gamelet_name()));
-  } else {
-    evt.project_id = project_id;
-    evt.organization_id = organization_id;
-
-    status = InitSsh(instance_id, project_id, organization_id, &instance_ip,
-                     &instance_port);
-
-    if (status.ok()) {
-      status = session_manager_->StartSession(
-          instance_id, project_id, organization_id, instance_ip, instance_port,
-          request->workstation_directory(), &ms,
-          &evt.as_manager_data->session_start_data->status);
-    }
-  }
+  metrics::DeveloperLogEvent evt;
+  std::string instance_id;
+  absl::Status status = StartSessionInternal(request, &instance_id, &ms, &evt);

  evt.as_manager_data->session_start_data->absl_status = status.code();
  if (ms) {
    evt.as_manager_data->session_start_data->concurrent_session_count =
        ms->GetSessionCount();
-    if (!instance_id.empty() && ms->HasSessionForInstance(instance_id)) {
+    if (!instance_id.empty() && ms->HasSession(instance_id)) {
      ms->RecordSessionEvent(std::move(evt), metrics::EventType::kSessionStart,
                             instance_id);
    } else {
@@ -166,9 +147,14 @@ grpc::Status LocalAssetsStreamManagerServiceImpl::StartSession(
 grpc::Status LocalAssetsStreamManagerServiceImpl::StopSession(
    grpc::ServerContext* /*context*/, const StopSessionRequest* request,
    StopSessionResponse* /*response*/) {
-  LOG_INFO("RPC:StopSession(gamelet_id='%s')", request->gamelet_id());
+  LOG_INFO("RPC:StopSession(%s)", RequestToString(*request));

-  absl::Status status = session_manager_->StopSession(request->gamelet_id());
+  std::string instance_id =
+      !request->gamelet_id().empty()  // Stadia use case
+          ? request->gamelet_id()
+          : absl::StrCat(request->user_host(), ":", request->mount_dir());
+
+  absl::Status status = session_manager_->StopSession(instance_id);
  if (status.ok()) {
    LOG_INFO("StopSession() succeeded");
  } else {
@@ -177,6 +163,86 @@ grpc::Status LocalAssetsStreamManagerServiceImpl::StopSession(
  return ToGrpcStatus(status);
 }

+absl::Status LocalAssetsStreamManagerServiceImpl::StartSessionInternal(
+    const StartSessionRequest* request, std::string* instance_id,
+    MultiSession** ms, metrics::DeveloperLogEvent* evt) {
+  instance_id->clear();
+  *ms = nullptr;
+  evt->as_manager_data = std::make_unique<metrics::AssetStreamingManagerData>();
+  evt->as_manager_data->session_start_data =
+      std::make_unique<metrics::SessionStartData>();
+  evt->as_manager_data->session_start_data->absl_status = absl::StatusCode::kOk;
+  evt->as_manager_data->session_start_data->status =
+      metrics::SessionStartStatus::kOk;
+  evt->as_manager_data->session_start_data->origin =
+      ConvertOrigin(request->origin());
+
+  if (!(request->gamelet_name().empty() ^ request->user_host().empty())) {
+    return absl::InvalidArgumentError(
+        "Must set either gamelet_name or user_host.");
+  }
+
+  if (request->mount_dir().empty()) {
+    return absl::InvalidArgumentError("mount_dir cannot be empty.");
+  }
+
+  SessionTarget target;
+  if (!request->gamelet_name().empty()) {
+    ASSIGN_OR_RETURN(target,
+                     GetTargetForStadia(*request, instance_id, &evt->project_id,
+                                        &evt->organization_id));
+  } else {
+    target = GetTarget(*request, instance_id);
+  }
+
+  return session_manager_->StartSession(
+      *instance_id, request->workstation_directory(), target, evt->project_id,
+      evt->organization_id, ms,
+      &evt->as_manager_data->session_start_data->status);
+}
+
+absl::StatusOr<SessionTarget>
+LocalAssetsStreamManagerServiceImpl::GetTargetForStadia(
+    const StartSessionRequest& request, std::string* instance_id,
+    std::string* project_id, std::string* organization_id) {
+  SessionTarget target;
+  target.mount_dir = request.mount_dir();
+  target.ssh_command = request.ssh_command();
+  target.scp_command = request.scp_command();
+
+  // Parse instance/project/org id.
+  if (!ParseInstanceName(request.gamelet_name(), instance_id, project_id,
+                         organization_id)) {
+    return absl::InvalidArgumentError(absl::StrFormat(
+        "Failed to parse instance name '%s'", request.gamelet_name()));
+  }
+
+  // Run 'ggp ssh init' to determine IP (host) and port.
+  std::string instance_ip;
+  uint16_t instance_port = 0;
+  RETURN_IF_ERROR(InitSsh(*instance_id, *project_id, *organization_id,
+                          &instance_ip, &instance_port));
+
+  target.user_host = "cloudcast@" + instance_ip;
+  target.ssh_port = instance_port;
+  return target;
+}
+
+SessionTarget LocalAssetsStreamManagerServiceImpl::GetTarget(
+    const StartSessionRequest& request, std::string* instance_id) {
+  SessionTarget target;
+  target.user_host = request.user_host();
+  target.mount_dir = request.mount_dir();
+  target.ssh_command = request.ssh_command();
+  target.scp_command = request.scp_command();
+  target.ssh_port = request.port() > 0 && request.port() <= UINT16_MAX
+                        ? static_cast<uint16_t>(request.port())
+                        : RemoteUtil::kDefaultSshPort;
+
+  *instance_id = absl::StrCat(target.user_host, ":", target.mount_dir);
+  return target;
+}
+
 metrics::RequestOrigin LocalAssetsStreamManagerServiceImpl::ConvertOrigin(
    StartSessionRequestOrigin origin) const {
  switch (origin) {
--- a/asset_stream_manager/local_assets_stream_manager_service_impl.h
+++ b/asset_stream_manager/local_assets_stream_manager_service_impl.h
@@ -19,6 +19,7 @@

 #include "absl/status/status.h"
 #include "absl/status/statusor.h"
+#include "asset_stream_manager/session.h"
 #include "asset_stream_manager/session_config.h"
 #include "metrics/metrics.h"
 #include "proto/local_assets_stream_manager.grpc.pb.h"
@@ -66,6 +67,27 @@ class LocalAssetsStreamManagerServiceImpl final
                           StopSessionResponse* response) override;

 private:
+  // Internal implementation of StartSession(). Returns the unique session
+  // identifier |instance_id|, the created or retrieved MultiSession |ms| as
+  // well as the filled metrics event |evt|.
+  absl::Status LocalAssetsStreamManagerServiceImpl::StartSessionInternal(
+      const StartSessionRequest* request, std::string* instance_id,
+      MultiSession** ms, metrics::DeveloperLogEvent* evt);
+
+  // Stadia-specific: Returns a SessionTarget from a gamelet name and fills in
+  // the gamelet's |instance_id|, |project_id| and |organization_id|.
+  // Used if request.gamelet_name() is set.
+  // Fails if the gamelet name fails to parse or if ggp ssh init fails.
+  absl::StatusOr<SessionTarget> GetTargetForStadia(
+      const StartSessionRequest& request, std::string* instance_id,
+      std::string* project_id, std::string* organization_id);
+
+  // Returns a SessionTarget from the corresponding fields in |request|.
+  // |instance_id| is set to [user@]host:mount_dir.
+  // Used if request.gamelet_name() is not set.
+  SessionTarget GetTarget(const StartSessionRequest& request,
+                          std::string* instance_id);
+
  // Convert StartSessionRequest enum to metrics enum.
  metrics::RequestOrigin ConvertOrigin(StartSessionRequestOrigin origin) const;

--- a/asset_stream_manager/main.cc
+++ b/asset_stream_manager/main.cc
@@ -20,6 +20,7 @@
 #include "asset_stream_manager/local_assets_stream_manager_service_impl.h"
 #include "asset_stream_manager/session_management_server.h"
 #include "asset_stream_manager/session_manager.h"
+#include "common/grpc_status.h"
 #include "common/log.h"
 #include "common/path.h"
 #include "common/process.h"
@@ -49,15 +50,19 @@ absl::Status Run(const AssetStreamConfig& cfg) {
  background_service.SetExitCallback(
      [&sm_server]() { return sm_server.Shutdown(); });

-  RETURN_IF_ERROR(sm_server.Start(kSessionManagementPort));
-  if (!cfg.src_dir().empty()) {
-    MultiSession* ms_unused;
-    metrics::SessionStartStatus status_unused;
-    RETURN_IF_ERROR(session_manager.StartSession(
-        /*instance_id=*/cfg.instance_ip(), /*project_id=*/std::string(),
-        /*organization_id=*/std::string(), cfg.instance_ip(),
-        cfg.instance_port(), cfg.src_dir(), &ms_unused, &status_unused));
+  if (!cfg.dev_src_dir().empty()) {
+    localassetsstreammanager::StartSessionRequest request;
+    request.set_workstation_directory(cfg.dev_src_dir());
+    request.set_user_host(cfg.dev_target().user_host);
+    request.set_mount_dir(cfg.dev_target().mount_dir);
+    request.set_port(cfg.dev_target().ssh_port);
+    request.set_ssh_command(cfg.dev_target().ssh_command);
+    request.set_scp_command(cfg.dev_target().scp_command);
+    localassetsstreammanager::StartSessionResponse response;
+    RETURN_ABSL_IF_ERROR(
+        session_service.StartSession(nullptr, &request, &response));
  }
+  RETURN_IF_ERROR(sm_server.Start(kSessionManagementPort));
  sm_server.RunUntilShutdown();
  return absl::OkStatus();
 }
@@ -96,18 +101,6 @@ const auto RETIRED_FLAGS_REG_allow_edge =
 }  // namespace
 }  // namespace cdc_ft

-ABSL_FLAG(std::string, src_dir, "",
-          "Start a streaming session immediately from the given Windows path. "
-          "Used during development. Must have exactly one gamelet reserved or "
-          "specify the target gamelet with --instance.");
-ABSL_FLAG(std::string, instance_ip, "",
-          "Connect to the instance with the given IP address for this session. "
-          "This flag is ignored unless --src_dir is set as well. Used "
-          "during development. ");
-ABSL_FLAG(uint16_t, instance_port, 0,
-          "Connect to the instance through the given SSH port. "
-          "This flag is ignored unless --src_dir is set as well. Used "
-          "during development. ");
 ABSL_FLAG(int, verbosity, 2, "Verbosity of the log output");
 ABSL_FLAG(bool, debug, false, "Run FUSE filesystem in debug mode");
 ABSL_FLAG(bool, singlethreaded, false,
@@ -132,6 +125,28 @@ ABSL_FLAG(uint32_t, access_idle_timeout, cdc_ft::DataProvider::kAccessIdleSec,
          "Do not run instance cache cleanups for this many seconds after the "
          "last file access");

+// Development args.
+ABSL_FLAG(std::string, dev_src_dir, "",
+          "Start a streaming session immediately from the given Windows path. "
+          "Used during development. Must also specify --dev_user_host and "
+          "--dev_mount_dir and possibly other --dev flags, depending on the "
+          "SSH setup");
+ABSL_FLAG(std::string, dev_user_host, "",
+          "Username and host to stream to, of the form [user@]host. Used "
+          "during development. See --dev_src_dir for more info.");
+ABSL_FLAG(uint16_t, dev_ssh_port, cdc_ft::RemoteUtil::kDefaultSshPort,
+          "SSH port to use for the connection to the host. Used during "
+          "development. See --dev_src_dir for more info.");
+ABSL_FLAG(std::string, dev_ssh_command, "",
+          "Ssh command and extra flags to use for the connection to the host. "
+          "Used during development. See --dev_src_dir for more info.");
+ABSL_FLAG(std::string, dev_scp_command, "",
+          "Scp command and extra flags to use for the connection to the host. "
+          "Used during development. See --dev_src_dir for more info.");
+ABSL_FLAG(std::string, dev_mount_dir, "",
+          "Directory on the host to stream to. Used during development. See "
+          "--dev_src_dir for more info.");
+
 int main(int argc, char* argv[]) {
  absl::ParseCommandLine(argc, argv);

--- a/asset_stream_manager/multi_session.cc
+++ b/asset_stream_manager/multi_session.cc
@@ -478,7 +478,7 @@ absl::Status MultiSession::Shutdown() {
  while (!sessions_.empty()) {
    std::string instance_id = sessions_.begin()->first;
    RETURN_IF_ERROR(StopSession(instance_id),
-                    "Failed to stop session for instance id %s", instance_id);
+                    "Failed to stop session for instance id '%s'", instance_id);
    sessions_.erase(instance_id);
  }

@@ -499,10 +499,9 @@ absl::Status MultiSession::Status() {
 }

 absl::Status MultiSession::StartSession(const std::string& instance_id,
+                                        const SessionTarget& target,
                                        const std::string& project_id,
-                                        const std::string& organization_id,
-                                        const std::string& instance_ip,
-                                        uint16_t instance_port) {
+                                        const std::string& organization_id) {
  absl::MutexLock lock(&sessions_mutex_);

  if (sessions_.find(instance_id) != sessions_.end()) {
@@ -523,9 +522,8 @@ absl::Status MultiSession::StartSession(const std::string& instance_id,
      metrics_recorder_->GetMetricsService(),
      metrics_recorder_->MultiSessionId(), project_id, organization_id);

-  auto session =
-      std::make_unique<Session>(instance_id, instance_ip, instance_port, cfg_,
-                                process_factory_, std::move(metrics_recorder));
+  auto session = std::make_unique<Session>(
+      instance_id, target, cfg_, process_factory_, std::move(metrics_recorder));
  RETURN_IF_ERROR(session->Start(local_asset_stream_port_,
                                 kAssetStreamPortFirst, kAssetStreamPortLast));

@@ -552,7 +550,7 @@ absl::Status MultiSession::StopSession(const std::string& instance_id) {
  return absl::OkStatus();
 }

-bool MultiSession::HasSessionForInstance(const std::string& instance_id) {
+bool MultiSession::HasSession(const std::string& instance_id) {
  absl::ReaderMutexLock lock(&sessions_mutex_);
  return sessions_.find(instance_id) != sessions_.end();
 }
@@ -663,19 +661,19 @@ void MultiSession::OnContentSent(size_t byte_count, size_t chunck_count,
                                 std::string instance_id) {
  if (instance_id.empty()) {
    // |instance_id| is empty only in case when manifest wasn't acknowledged by
-    // the gamelet yet (ConfigStreamServiceImpl::AckManifestIdReceived was not
+    // the instance yet (ConfigStreamServiceImpl::AckManifestIdReceived was not
    // invoked). This means MultiSession::StartSession is still waiting for
    // manifest acknowledge and |sessions_mutex_| is currently locked. In this
    // case invoking MultiSession::FindSession and waiting for |sessions_mutex_|
    // to get unlocked will block the current thread, which is also responsible
    // for receiving a call at ConfigStreamServiceImpl::AckManifestIdReceived.
    // This causes a deadlock and leads to a DeadlineExceeded error.
-    LOG_WARNING("Can not record session content for an empty instance_id.");
+    LOG_WARNING("Cannot record session content for an empty instance_id.");
    return;
  }
  Session* session = FindSession(instance_id);
  if (session == nullptr) {
-    LOG_WARNING("Failed to find active session by instrance id: %s",
+    LOG_WARNING("Failed to find active session by instance id '%s'",
                instance_id);
    return;
  }
--- a/asset_stream_manager/multi_session.h
+++ b/asset_stream_manager/multi_session.h
@@ -36,6 +36,7 @@ namespace cdc_ft {

 class ProcessFactory;
 class Session;
+struct SessionTarget;
 using ManifestUpdatedCb = std::function<void()>;

 // Updates the manifest and runs a file watcher in a background thread.
@@ -65,7 +66,7 @@ class MultiSessionRunner {
  // Stops updating the manifest and |server_|.
  absl::Status Shutdown() ABSL_LOCKS_EXCLUDED(mutex_);

-  // Waits until a manifest is ready and the gamelet |instance_id| has
+  // Waits until a manifest is ready and the session for |instance_id| has
  // acknowledged the reception of the currently set manifest id. |fuse_timeout|
  // is the timeout for waiting for the FUSE manifest ack. The time required to
  // generate the manifest is not part of this timeout as this could take a
@@ -172,30 +173,29 @@ class MultiSession {
  // Not thread-safe.
  absl::Status Status();

-  // Starts a new streaming session to the instance with given |instance_id| and
+  // Starts a new streaming session to the instance described by |target| and
  // waits until the FUSE has received the initial manifest id.
  // Returns an error if a session for that instance already exists.
-  // |instance_id| is the instance id of the target remote instance.
-  // |project_id| is id of the project that contains the instance.
-  // |organization_id| is id of the organization that contains the instance.
-  // |instance_ip| is the IP address of the instance.
-  // |instance_port| is the SSH port for connecting to the remote instance.
+  // |instance_id| is a unique id for the remote instance and mount directory,
+  // e.g. user@host:mount_dir.
+  // |target| identifies the remote target and how to connect to it.
+  // |project_id| is the project that owns the instance. Stadia only.
+  // |organization_id| is organization that contains the instance. Stadia only.
  // Thread-safe.
  absl::Status StartSession(const std::string& instance_id,
+                            const SessionTarget& target,
                            const std::string& project_id,
-                            const std::string& organization_id,
-                            const std::string& instance_ip,
-                            uint16_t instance_port)
+                            const std::string& organization_id)
      ABSL_LOCKS_EXCLUDED(sessions_mutex_);

-  // Starts a new streaming session to the gamelet with given |instance_id|.
+  // Stops the session for the given |instance_id|.
  // Returns a NotFound error if a session for that instance does not exists.
  // Thread-safe.
  absl::Status StopSession(const std::string& instance_id)
      ABSL_LOCKS_EXCLUDED(sessions_mutex_);

  // Returns true if there is an existing session for |instance_id|.
-  bool HasSessionForInstance(const std::string& instance_id)
+  bool HasSession(const std::string& instance_id)
      ABSL_LOCKS_EXCLUDED(sessions_mutex_);

  // Returns true if the FUSE process is up and running for an existing session
@@ -226,7 +226,7 @@ class MultiSession {
  void RecordMultiSessionEvent(metrics::DeveloperLogEvent event,
                               metrics::EventType code);

-  // Record an event for a session associated with the |instance|.
+  // Record an event for a session associated with the |instance_id|.
  void RecordSessionEvent(metrics::DeveloperLogEvent event,
                          metrics::EventType code,
                          const std::string& instance_id);
--- a/asset_stream_manager/session.cc
+++ b/asset_stream_manager/session.cc
@@ -26,7 +26,7 @@ namespace cdc_ft {
 namespace {

 // Timeout for initial gamelet connection.
-constexpr double kInstanceConnectionTimeoutSec = 10.0f;
+constexpr double kInstanceConnectionTimeoutSec = 60.0f;

 metrics::DeveloperLogEvent GetEventWithHeartBeatData(size_t bytes,
                                                     size_t chunks) {
@@ -40,18 +40,24 @@ metrics::DeveloperLogEvent GetEventWithHeartBeatData(size_t bytes,

 }  // namespace

-Session::Session(std::string instance_id, std::string instance_ip,
-                 uint16_t instance_port, SessionConfig cfg,
-                 ProcessFactory* process_factory,
+Session::Session(std::string instance_id, const SessionTarget& target,
+                 SessionConfig cfg, ProcessFactory* process_factory,
                 std::unique_ptr<SessionMetricsRecorder> metrics_recorder)
    : instance_id_(std::move(instance_id)),
+      mount_dir_(target.mount_dir),
      cfg_(std::move(cfg)),
      process_factory_(process_factory),
      remote_util_(cfg_.verbosity, cfg_.quiet, process_factory,
                   /*forward_output_to_logging=*/true),
      metrics_recorder_(std::move(metrics_recorder)) {
  assert(metrics_recorder_);
-  remote_util_.SetUserHostAndPort(instance_ip, instance_port);
+  remote_util_.SetUserHostAndPort(target.user_host, target.ssh_port);
+  if (!target.ssh_command.empty()) {
+    remote_util_.SetSshCommand(target.ssh_command);
+  }
+  if (!target.scp_command.empty()) {
+    remote_util_.SetScpCommand(target.scp_command);
+  }
 }

 Session::~Session() {
@@ -80,9 +86,10 @@ absl::Status Session::Start(int local_port, int first_remote_port,
  fuse_ = std::make_unique<CdcFuseManager>(instance_id_, process_factory_,
                                           &remote_util_);
  RETURN_IF_ERROR(
-      fuse_->Start(local_port, remote_port, cfg_.verbosity, cfg_.fuse_debug,
-                   cfg_.fuse_singlethreaded, cfg_.stats, cfg_.fuse_check,
-                   cfg_.fuse_cache_capacity, cfg_.fuse_cleanup_timeout_sec,
+      fuse_->Start(mount_dir_, local_port, remote_port, cfg_.verbosity,
+                   cfg_.fuse_debug, cfg_.fuse_singlethreaded, cfg_.stats,
+                   cfg_.fuse_check, cfg_.fuse_cache_capacity,
+                   cfg_.fuse_cleanup_timeout_sec,
                   cfg_.fuse_access_idle_timeout_sec),
      "Failed to start instance component");
  return absl::OkStatus();
--- a/asset_stream_manager/session.h
+++ b/asset_stream_manager/session.h
@@ -32,17 +32,29 @@ class CdcFuseManager;
 class ProcessFactory;
 class Process;

-// Manages the connection of a workstation to a single gamelet.
+// Defines a remote target and how to connect to it.
+struct SessionTarget {
+  // SSH username and hostname of the remote target, formed as [user@]host.
+  std::string user_host;
+  // Port to use for SSH connections to the remote target.
+  uint16_t ssh_port;
+  // Ssh command to use to connect to the remote target.
+  std::string ssh_command;
+  // Scp command to use to copy files to the remote target.
+  std::string scp_command;
+  // Directory on the remote target where to mount the streamed directory.
+  std::string mount_dir;
+};
+
+// Manages the connection of a workstation to a single remote instance.
 class Session {
 public:
  // |instance_id| is a unique id for the remote instance.
-  // |instance_ip| is the IP address of the remote instance.
-  // |instance_port| is the SSH tunnel port for connecting to the instance.
+  // |target| identifies the remote target and how to connect to it.
  // |cfg| contains generic configuration parameters for the session.
  // |process_factory| abstracts process creation.
-  Session(std::string instance_id, std::string instance_ip,
-          uint16_t instance_port, SessionConfig cfg,
-          ProcessFactory* process_factory,
+  Session(std::string instance_id, const SessionTarget& target,
+          SessionConfig cfg, ProcessFactory* process_factory,
          std::unique_ptr<SessionMetricsRecorder> metrics_recorder);
  ~Session();

@@ -71,6 +83,7 @@ class Session {

 private:
  const std::string instance_id_;
+  const std::string mount_dir_;
  const SessionConfig cfg_;
  ProcessFactory* const process_factory_;

--- a/asset_stream_manager/session_manager.cc
+++ b/asset_stream_manager/session_manager.cc
@@ -59,10 +59,10 @@ absl::Status SessionManager::Shutdown() {
 }

 absl::Status SessionManager::StartSession(
-    const std::string& instance_id, const std::string& project_id,
-    const std::string& organization_id, const std::string& instance_ip,
-    uint16_t instance_port, const std::string& src_dir,
-    MultiSession** multi_session, metrics::SessionStartStatus* metrics_status) {
+    const std::string& instance_id, const std::string& src_dir,
+    const SessionTarget& target, const std::string& project_id,
+    const std::string& organization_id, MultiSession** multi_session,
+    metrics::SessionStartStatus* metrics_status) {
  *multi_session = nullptr;
  *metrics_status = metrics::SessionStartStatus::kOk;

@@ -83,7 +83,7 @@ absl::Status SessionManager::StartSession(
  // Early out if we are streaming the workstation dir to the given gamelet.
  MultiSession* ms = GetMultiSession(src_dir);
  *multi_session = ms;
-  if (ms && ms->HasSessionForInstance(instance_id)) {
+  if (ms && ms->HasSession(instance_id)) {
    if (ms->IsSessionHealthy(instance_id)) {
      LOG_INFO("Reusing existing session");
      return absl::OkStatus();
@@ -95,8 +95,8 @@ absl::Status SessionManager::StartSession(
    // We could also fall through, but this might restart the MultiSession.
    status = ms->StopSession(instance_id);
    if (status.ok()) {
-      status = ms->StartSession(instance_id, project_id, organization_id,
-                                instance_ip, instance_port);
+      status =
+          ms->StartSession(instance_id, target, project_id, organization_id);
    }
    if (!status.ok()) {
      *metrics_status = metrics::SessionStartStatus::kRestartSessionError;
@@ -129,8 +129,7 @@ absl::Status SessionManager::StartSession(
  // Start the session.
  LOG_INFO("Starting streaming session from path '%s' to instance '%s'",
           src_dir, instance_id);
-  status = ms->StartSession(instance_id, project_id, organization_id,
-                            instance_ip, instance_port);
+  status = ms->StartSession(instance_id, target, project_id, organization_id);
  if (!status.ok()) {
    *metrics_status = metrics::SessionStartStatus::kStartSessionError;
  }
@@ -164,15 +163,16 @@ absl::StatusOr<MultiSession*> SessionManager::GetOrCreateMultiSession(
  return iter->second.get();
 }

-absl::Status SessionManager::StopSessionInternal(const std::string& instance) {
+absl::Status SessionManager::StopSessionInternal(
+    const std::string& instance_id) {
  absl::Status status;
  for (const auto& [key, ms] : sessions_) {
-    if (!ms->HasSessionForInstance(instance)) continue;
+    if (!ms->HasSession(instance_id)) continue;

    LOG_INFO("Stopping session streaming from '%s' to instance '%s'",
-             ms->src_dir(), instance);
-    RETURN_IF_ERROR(ms->StopSession(instance),
-                    "Failed to stop session for instance '%s'", instance);
+             ms->src_dir(), instance_id);
+    RETURN_IF_ERROR(ms->StopSession(instance_id),
+                    "Failed to stop session for instance '%s'", instance_id);

    // Session was stopped. If the MultiSession is empty now, delete it.
    if (ms->Empty()) {
@@ -187,7 +187,7 @@ absl::Status SessionManager::StopSessionInternal(const std::string& instance) {
  }

  return absl::NotFoundError(
-      absl::StrFormat("No session for instance id '%s' found", instance));
+      absl::StrFormat("No session for instance '%s' found", instance_id));
 }

 }  // namespace cdc_ft
--- a/asset_stream_manager/session_manager.h
+++ b/asset_stream_manager/session_manager.h
@@ -30,43 +30,46 @@ namespace cdc_ft {

 class MultiSession;
 class ProcessFactory;
+struct SessionTarget;

-// Implements a service to start and stop streaming sessions as a server.
-// The corresponding clients are implemented by the ggp CLI and SDK Proxy.
-// The CLI triggers StartSession() from `ggp instance mount --local-dir` and
-// StopSession() from `ggp instance unmount`. SDK Proxy invokes StartSession()
-// when a user starts a new game from the partner portal and sets an `Asset
-// streaming directory` in the `Advanced settings` in the `Play settings`
-// dialog.
-// This service is owned by SessionManagementServer.
+// Adds logic around MultiSession to start and stop streaming sessions. Makes
+// sure that some invariants are maintained, like no two streaming sessions
+// exist to the same target user@host:dir.
 class SessionManager {
 public:
  SessionManager(SessionConfig cfg, ProcessFactory* process_factory,
                 metrics::MetricsService* metrics_service);
  ~SessionManager();

-  // Starts a session and populates |multi_session| and |metrics_status|.
+  // Starts a new session or reuses an existing one.
+  // |instance_id| is a unique id for the remote instance and mount directory,
+  // e.g. user@host:mount_dir.
+  // |src_dir| is the local directory to stream.
+  // |target| identifies the remote target and how to connect to it.
+  // |project_id| is the project that owns the instance. Stadia only.
+  // |organization_id| is organization that contains the instance. Stadia only.
+  // Populates |multi_session| and |metrics_status| on success.
  absl::Status StartSession(const std::string& instance_id,
+                            const std::string& src_dir,
+                            const SessionTarget& target,
                            const std::string& project_id,
                            const std::string& organization_id,
-                            const std::string& instance_ip,
-                            uint16_t instance_port, const std::string& src_dir,
                            MultiSession** multi_session,
                            metrics::SessionStartStatus* metrics_status)
      ABSL_LOCKS_EXCLUDED(sessions_mutex_);

-  // Stops the session for the given |instance|. Returns a NotFound error if no
-  // session exists.
-  absl::Status StopSession(const std::string& instance)
+  // Stops the session for the given |instance_id|.
+  // Returns a NotFound error if no session exists.
+  absl::Status StopSession(const std::string& instance_id)
      ABSL_LOCKS_EXCLUDED(sessions_mutex_);

  // Shuts down all existing MultiSessions.
  absl::Status Shutdown() ABSL_LOCKS_EXCLUDED(sessions_mutex_);

 private:
-  // Stops the session for the given |instance|. Returns a NotFound error if no
-  // session exists.
-  absl::Status StopSessionInternal(const std::string& instance)
+  // Stops the session for the given |instance_id|. Returns a NotFound error if
+  // no session exists.
+  absl::Status StopSessionInternal(const std::string& instance_id)
      ABSL_EXCLUSIVE_LOCKS_REQUIRED(sessions_mutex_);

  // Returns the MultiSession for the given workstation directory |src_dir| or
--- a/cdc_fuse_fs/cdc_fuse_fs.vcxproj
+++ b/cdc_fuse_fs/cdc_fuse_fs.vcxproj
@@ -52,7 +52,6 @@
    <BazelTargets>//cdc_fuse_fs</BazelTargets>
    <BazelOutputFile>cdc_fuse_fs</BazelOutputFile>
    <BazelIncludePaths>..\;..\third_party\absl;..\third_party\blake3\c;..\third_party\googletest\googletest\include;..\third_party\protobuf\src;..\third_party\grpc\include;$(AdditionalIncludeDirectories)</BazelIncludePaths>
-    <BazelSourcePathPrefix>..\/</BazelSourcePathPrefix>
  </PropertyGroup>
  <Import Project="..\NMakeBazelProject.targets" />
  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
--- a/cdc_rsync/cdc_rsync.vcxproj
+++ b/cdc_rsync/cdc_rsync.vcxproj
@@ -69,16 +69,15 @@
    <BazelTargets>//cdc_rsync</BazelTargets>
    <BazelOutputFile>cdc_rsync.exe</BazelOutputFile>
    <BazelIncludePaths>..\;..\third_party\absl;..\third_party\blake3\c;..\bazel-stadia-file-transfer\external\com_github_zstd\lib;..\third_party\googletest\googletest\include;..\third_party\protobuf\src;$(VC_IncludePath);$(WindowsSDK_IncludePath)</BazelIncludePaths>
-    <BazelSourcePathPrefix>..\/</BazelSourcePathPrefix>
  </PropertyGroup>
  <Import Project="..\NMakeBazelProject.targets" />
  <!-- For some reason, msbuild doesn't include this file, so copy it explicitly. -->
  <!-- TODO: Reenable once we can cross-compile these.
  <PropertyGroup>
-    <GgpRsyncServerFile>$(SolutionDir)bazel-out\k8-$(BazelCompilationMode)\bin\cdc_rsync_server\cdc_rsync_server</GgpRsyncServerFile>
+    <CdcRsyncServerFile>$(SolutionDir)bazel-out\k8-$(BazelCompilationMode)\bin\cdc_rsync_server\cdc_rsync_server</CdcRsyncServerFile>
  </PropertyGroup>
-  <Target Name="CopyServer" Inputs="$(GgpRsyncServerFile)" Outputs="$(OutDir)cdc_rsync_server" AfterTargets="Build">
-    <Copy SourceFiles="$(GgpRsyncServerFile)" DestinationFiles="$(OutDir)cdc_rsync_server" />
+  <Target Name="CopyServer" Inputs="$(CdcRsyncServerFile)" Outputs="$(OutDir)cdc_rsync_server" AfterTargets="Build">
+    <Copy SourceFiles="$(CdcRsyncServerFile)" DestinationFiles="$(OutDir)cdc_rsync_server" />
  </Target>
  -->
  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
--- a/cdc_rsync/cdc_rsync_client.cc
+++ b/cdc_rsync/cdc_rsync_client.cc
@@ -46,8 +46,8 @@ constexpr int kExitCodeNotFound = 127;

 constexpr int kForwardPortFirst = 44450;
 constexpr int kForwardPortLast = 44459;
-constexpr char kGgpServerFilename[] = "cdc_rsync_server";
-constexpr char kRemoteToolsBinDir[] = "~/.cache/cdc_file_transfer/";
+constexpr char kCdcServerFilename[] = "cdc_rsync_server";
+constexpr char kRemoteToolsBinDir[] = "~/.cache/cdc-file-transfer/bin/";

 SetOptionsRequest::FilterRule::Type ToProtoType(PathFilter::Rule::Type type) {
  switch (type) {
@@ -178,7 +178,7 @@ absl::Status CdcRsyncClient::StartServer() {

  std::vector<GameletComponent> components;
  status = GameletComponent::Get(
-      {path::Join(component_dir, kGgpServerFilename)}, &components);
+      {path::Join(component_dir, kCdcServerFilename)}, &components);
  if (!status.ok()) {
    return MakeStatus(
        "Required instance component not found. Make sure the file "
@@ -202,7 +202,7 @@ absl::Status CdcRsyncClient::StartServer() {
  int port = *port_res;

  std::string remote_server_path =
-      std::string(kRemoteToolsBinDir) + kGgpServerFilename;
+      std::string(kRemoteToolsBinDir) + kCdcServerFilename;
  // Test existence manually to prevent misleading bash output message
  // "bash: .../cdc_rsync_server: No such file or directory".
  // Also create the bin dir because otherwise scp below might fail.
@@ -411,9 +411,9 @@ absl::Status CdcRsyncClient::DeployServer() {

  // scp cdc_rsync_server to a temp location on the gamelet.
  std::string remoteServerTmpPath =
-      absl::StrFormat("%s%s.%s", kRemoteToolsBinDir, kGgpServerFilename,
+      absl::StrFormat("%s%s.%s", kRemoteToolsBinDir, kCdcServerFilename,
                      Util::GenerateUniqueId());
-  std::string localServerPath = path::Join(exe_dir, kGgpServerFilename);
+  std::string localServerPath = path::Join(exe_dir, kCdcServerFilename);
  status = remote_util_.Scp({localServerPath}, remoteServerTmpPath,
                            /*compress=*/true);
  if (!status.ok()) {
@@ -424,9 +424,9 @@ absl::Status CdcRsyncClient::DeployServer() {
  // - Make the old cdc_rsync_server writable (if it exists).
  // - Make the new cdc_rsync_server executable.
  // - Replace the old cdc_rsync_server by the new one.
-  std::string old_path = RemoteUtil::EscapeForWindows(
-      std::string(kRemoteToolsBinDir) + kGgpServerFilename);
-  std::string new_path = RemoteUtil::EscapeForWindows(remoteServerTmpPath);
+  std::string old_path = RemoteUtil::QuoteForWindows(
+      std::string(kRemoteToolsBinDir) + kCdcServerFilename);
+  std::string new_path = RemoteUtil::QuoteForWindows(remoteServerTmpPath);
  std::string replace_cmd = absl::StrFormat(
      " ([ ! -f %s ] || chmod u+w %s) && chmod a+x %s && mv %s %s", old_path,
      old_path, new_path, new_path, old_path);
--- a/cdc_rsync/params.cc
+++ b/cdc_rsync/params.cc
@@ -73,10 +73,10 @@ Options:
 -R, --relative            Use relative path names
    --existing            Skip creating new files on instance
    --copy-dest dir       Use files from dir as sync base if files are missing
-    --ssh-command         Path and arguments of SSH command to use, e.g.
+    --ssh-command         Path and arguments of ssh command to use, e.g.
                          C:\path\to\ssh.exe -F config -i id_rsa -oStrictHostKeyChecking=yes -oUserKnownHostsFile="""known_hosts"""
                          Can also be specified by the CDC_SSH_COMMAND environment variable.
-    --scp-command         Path and arguments of SSH command to use, e.g.
+    --scp-command         Path and arguments of scp command to use, e.g.
                          C:\path\to\scp.exe -F config -i id_rsa -oStrictHostKeyChecking=yes -oUserKnownHostsFile="""known_hosts"""
                          Can also be specified by the CDC_SCP_COMMAND environment variable.
 -h  --help                Help for cdc_rsync
--- a/cdc_rsync_server/cdc_rsync_server.vcxproj
+++ b/cdc_rsync_server/cdc_rsync_server.vcxproj
@@ -50,7 +50,6 @@
    <BazelTargets>//cdc_rsync_server:cdc_rsync_server</BazelTargets>
    <BazelOutputFile>cdc_rsync_server</BazelOutputFile>
    <BazelIncludePaths>..\;..\third_party\absl;..\third_party\blake3\c;..\bazel-stadia-file-transfer\external\com_github_zstd\lib;..\third_party\googletest\googletest\include;..\third_party\protobuf\src</BazelIncludePaths>
-    <BazelSourcePathPrefix>..\/</BazelSourcePathPrefix>
  </PropertyGroup>
  <Import Project="..\NMakeBazelProject.targets" />
  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
--- a/cdc_stream/.gitignore
+++ b/cdc_stream/.gitignore
@@ -0,0 +1,3 @@
+x64/*
+*.log
+*.user
--- a/cdc_stream/BUILD
+++ b/cdc_stream/BUILD
@@ -0,0 +1,26 @@
+package(default_visibility = [
+    "//:__subpackages__",
+])
+
+cc_binary(
+    name = "cdc_stream",
+    srcs = ["main.cc"],
+    deps = [
+        ":local_assets_stream_manager_client",
+        "//common:log",
+        "//common:path",
+        "@com_google_absl//absl/flags:parse",
+        "@com_google_absl//absl/status",
+    ],
+)
+
+cc_library(
+    name = "local_assets_stream_manager_client",
+    srcs = ["local_assets_stream_manager_client.cc"],
+    hdrs = ["local_assets_stream_manager_client.h"],
+    deps = [
+        "//common:grpc_status",
+        "//proto:local_assets_stream_manager_grpc_proto",
+        "@com_google_absl//absl/status",
+    ],
+)
--- a/cdc_stream/local_assets_stream_manager_client.cc
+++ b/cdc_stream/local_assets_stream_manager_client.cc
@@ -0,0 +1,62 @@
+// Copyright 2022 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.
+
+#include "cdc_stream/local_assets_stream_manager_client.h"
+
+#include "absl/status/status.h"
+#include "common/grpc_status.h"
+
+namespace cdc_ft {
+
+using StartSessionRequest = localassetsstreammanager::StartSessionRequest;
+using StartSessionResponse = localassetsstreammanager::StartSessionResponse;
+using StopSessionRequest = localassetsstreammanager::StopSessionRequest;
+using StopSessionResponse = localassetsstreammanager::StopSessionResponse;
+
+LocalAssetsStreamManagerClient::LocalAssetsStreamManagerClient(
+    std::shared_ptr<grpc::Channel> channel) {
+  stub_ = LocalAssetsStreamManager::NewStub(std::move(channel));
+}
+
+LocalAssetsStreamManagerClient::~LocalAssetsStreamManagerClient() = default;
+
+absl::Status LocalAssetsStreamManagerClient::StartSession(
+    const std::string& src_dir, const std::string& user_host, uint16_t ssh_port,
+    const std::string& mount_dir, const std::string& ssh_command,
+    const std::string& scp_command) {
+  StartSessionRequest request;
+  request.set_workstation_directory(src_dir);
+  request.set_user_host(user_host);
+  request.set_port(ssh_port);
+  request.set_mount_dir(mount_dir);
+  request.set_ssh_command(ssh_command);
+  request.set_scp_command(scp_command);
+
+  grpc::ClientContext context;
+  StartSessionResponse response;
+  return ToAbslStatus(stub_->StartSession(&context, request, &response));
+}
+
+absl::Status LocalAssetsStreamManagerClient::StopSession(
+    const std::string& user_host, const std::string& mount_dir) {
+  StopSessionRequest request;
+  request.set_user_host(user_host);
+  request.set_mount_dir(mount_dir);
+
+  grpc::ClientContext context;
+  StopSessionResponse response;
+  return ToAbslStatus(stub_->StopSession(&context, request, &response));
+}
+
+}  // namespace cdc_ft
--- a/cdc_stream/local_assets_stream_manager_client.h
+++ b/cdc_stream/local_assets_stream_manager_client.h
@@ -0,0 +1,63 @@
+/*
+ * Copyright 2022 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.
+ */
+
+#ifndef ASSET_STREAM_MANAGER_LOCAL_ASSETS_STREAM_MANAGER_CLIENT_H_
+#define ASSET_STREAM_MANAGER_LOCAL_ASSETS_STREAM_MANAGER_CLIENT_H_
+
+#include <memory>
+
+#include "absl/status/status.h"
+#include "grpcpp/channel.h"
+#include "proto/local_assets_stream_manager.grpc.pb.h"
+
+namespace grpc_impl {
+class Channel;
+}
+
+namespace cdc_ft {
+
+// gRpc client for starting/stopping asset streaming sessions.
+class LocalAssetsStreamManagerClient {
+ public:
+  // |channel| is a grpc channel to use.
+  explicit LocalAssetsStreamManagerClient(
+      std::shared_ptr<grpc::Channel> channel);
+  ~LocalAssetsStreamManagerClient();
+
+  // Starts streaming the Windows directory |src_dir| to the Linux target
+  // |user_host_dir|, which must be formatted as [user@]host:dir, e.g.
+  // jdoe@jdoe.corp.foo.com:~/assets
+  // Starting a second session to the same target will stop the first one.
+  absl::Status StartSession(const std::string& src_dir,
+                            const std::string& user_host, uint16_t ssh_port,
+                            const std::string& mount_dir,
+                            const std::string& ssh_command,
+                            const std::string& scp_command);
+
+  // Stops the streaming session to the Linux target |user_host_dir|, which must
+  // be formatted as [user@]host:dir, e.g. jdoe@jdoe.corp.foo.com:~/assets
+  absl::Status StopSession(const std::string& user_host_dir,
+                           const std::string& mount_dir);
+
+ private:
+  using LocalAssetsStreamManager =
+      localassetsstreammanager::LocalAssetsStreamManager;
+  std::unique_ptr<LocalAssetsStreamManager::Stub> stub_;
+};
+
+}  // namespace cdc_ft
+
+#endif  // ASSET_STREAM_MANAGER_LOCAL_ASSETS_STREAM_MANAGER_CLIENT_H_
--- a/cdc_stream/main.cc
+++ b/cdc_stream/main.cc
@@ -0,0 +1,158 @@
+// Copyright 2022 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.
+
+#include <memory>
+#include <vector>
+
+#include "absl/flags/flag.h"
+#include "absl/flags/parse.h"
+#include "absl/flags/usage.h"
+#include "absl/status/status.h"
+#include "absl/strings/str_split.h"
+#include "cdc_stream/local_assets_stream_manager_client.h"
+#include "common/log.h"
+#include "common/path.h"
+#include "grpcpp/channel.h"
+#include "grpcpp/security/credentials.h"
+
+ABSL_FLAG(uint16_t, service_port, 44432,
+          "Port to use while connecting to the local asset stream service.");
+ABSL_FLAG(
+    uint16_t, ssh_port, 22,
+    "Port to use while connecting to the remote instance being streamed to.");
+ABSL_FLAG(std::string, ssh_command, "",
+          "Path and arguments of ssh command to use, e.g. "
+          "\"C:\\path\\to\\ssh.exe -F config_file\". Can also be specified by "
+          "the CDC_SSH_COMMAND environment variable.");
+ABSL_FLAG(std::string, scp_command, "",
+          "Path and arguments of scp command to use, e.g. "
+          "\"C:\\path\\to\\scp.exe -F config_file\". Can also be specified by "
+          "the CDC_SCP_COMMAND environment variable.");
+ABSL_FLAG(int, verbosity, 2,
+          "Verbosity of the log output. Increase to make logs more verbose.");
+
+namespace {
+
+constexpr char kHelpText[] = R"!(Stream files from a Windows to a Linux device
+
+Usage: cdc_stream [flags] start windows_dir [user@]host:linux_dir
+       Streams the Windows directory windows_dir to directory linux_dir on the
+       Linux host using SSH username user.
+ 
+       cdc_stream [flags] stop [user@]host:linux_dir
+       Stops the streaming session to the given Linux target.
+
+Type cdc_stream --helpfull for available flags.)!";
+
+// Splits |user_host_dir| = [user@]host:dir up into [user@]host and dir.
+// Does not touch Windows drives, e.g. C:\foo.
+bool ParseUserHostDir(const std::string& user_host_dir, std::string* user_host,
+                      std::string* dir) {
+  std::vector<std::string> parts =
+      absl::StrSplit(user_host_dir, absl::MaxSplits(':', 1));
+  if (parts.size() < 2 ||
+      (parts[0].size() == 1 && toupper(parts[0][0]) >= 'A' &&
+       toupper(parts[0][0]) <= 'Z')) {
+    LOG_ERROR(
+        "Failed to parse '%s'. Make sure it is of the form "
+        "[user@]host:linux_dir.",
+        user_host_dir);
+    return false;
+  }
+
+  *user_host = parts[0];
+  *dir = parts[1];
+  return true;
+}
+
+std::string GetFlagFromEnvOrArgs(const char* env,
+                                 const absl::Flag<std::string>& flag) {
+  std::string value = absl::GetFlag(flag);
+  if (value.empty()) {
+    cdc_ft::path::GetEnv(env, &value).IgnoreError();
+  }
+  return value;
+}
+
+}  // namespace
+
+int main(int argc, char* argv[]) {
+  absl::SetProgramUsageMessage(kHelpText);
+  std::vector<char*> args = absl::ParseCommandLine(argc, argv);
+
+  uint16_t service_port = absl::GetFlag(FLAGS_service_port);
+  int verbosity = absl::GetFlag(FLAGS_verbosity);
+  std::string ssh_command =
+      GetFlagFromEnvOrArgs("CDC_SSH_COMMAND", FLAGS_ssh_command);
+  std::string scp_command =
+      GetFlagFromEnvOrArgs("CDC_SCP_COMMAND", FLAGS_scp_command);
+  uint16_t ssh_port = absl::GetFlag(FLAGS_ssh_port);
+
+  cdc_ft::LogLevel level = cdc_ft::Log::VerbosityToLogLevel(verbosity);
+  cdc_ft::Log::Initialize(std::make_unique<cdc_ft::ConsoleLog>(level));
+
+  if (args.size() < 2) {
+    LOG_INFO(kHelpText);
+    return 0;
+  }
+  std::string command = args[1];
+  if (command != "start" && command != "stop") {
+    LOG_ERROR("Unknown command '%s'. Must be 'start' or 'stop'.", command);
+    return 1;
+  }
+
+  // Start a gRpc client.
+  std::string client_address = absl::StrFormat("localhost:%u", service_port);
+  std::shared_ptr<grpc::Channel> grpc_channel = grpc::CreateCustomChannel(
+      client_address, grpc::InsecureChannelCredentials(),
+      grpc::ChannelArguments());
+
+  cdc_ft::LocalAssetsStreamManagerClient client(grpc_channel);
+
+  absl::Status status;
+  if (command == "start") {
+    if (args.size() < 4) {
+      LOG_ERROR(
+          "Command 'start' needs 2 arguments: the Windows directory to stream"
+          " and the Linux target [user@]host:dir.");
+      return 1;
+    }
+
+    std::string src_dir = args[2];
+    std::string user_host, mount_dir;
+    if (!ParseUserHostDir(args[3], &user_host, &mount_dir)) return 1;
+
+    status = client.StartSession(src_dir, user_host, ssh_port, mount_dir,
+                                 ssh_command, scp_command);
+  } else /* if (command == "stop") */ {
+    if (args.size() < 3) {
+      LOG_ERROR(
+          "Command 'stop' needs 1 argument: the Linux target "
+          "[user@]host:linux_dir.");
+      return 1;
+    }
+
+    std::string user_host, mount_dir;
+    if (!ParseUserHostDir(args[2], &user_host, &mount_dir)) return 1;
+
+    status = client.StopSession(user_host, mount_dir);
+  }
+
+  if (!status.ok()) {
+    LOG_ERROR("Error: %s", status.ToString());
+  }
+
+  cdc_ft::Log::Shutdown();
+  return static_cast<int>(status.code());
+}
--- a/common/path.cc
+++ b/common/path.cc
@@ -326,6 +326,10 @@ std::string GetDrivePrefix(const std::string& path) {

 std::string GetCwd() { return std::filesystem::current_path().u8string(); }

+void SetCwd(const std::string& path) {
+  std::filesystem::current_path(std::filesystem::u8path(path));
+}
+
 std::string GetFullPath(const std::string& path) {
  if (path.empty()) {
    return std::string();
--- a/common/path.h
+++ b/common/path.h
@@ -130,6 +130,9 @@ std::string GetDrivePrefix(const std::string& path);
 // Gets the current working directory.
 std::string GetCwd();

+// Sets the current working directory.
+void SetCwd(const std::string& path);
+
 // Expands a relative path to an absolute path (relative to the current working
 // directory). Also canonicalizes the path, removing any . and .. elements.
 // Note that if the path does not exist or contains invalid characters, it may
--- a/common/remote_util.cc
+++ b/common/remote_util.cc
@@ -16,6 +16,7 @@

 #include <regex>

+#include "absl/strings/match.h"
 #include "absl/strings/str_cat.h"
 #include "absl/strings/str_format.h"
 #include "common/path.h"
@@ -46,6 +47,7 @@ void RemoteUtil::SetUserHostAndPort(std::string user_host, int port) {
  user_host_ = std::move(user_host);
  ssh_port_ = port;
 }
+
 void RemoteUtil::SetScpCommand(std::string scp_command) {
  scp_command_ = std::move(scp_command);
 }
@@ -56,7 +58,7 @@ void RemoteUtil::SetSshCommand(std::string ssh_command) {

 absl::Status RemoteUtil::Scp(std::vector<std::string> source_filepaths,
                             const std::string& dest, bool compress) {
-  absl::Status status = CheckHostPort();
+  absl::Status status = CheckUserHostPort();
  if (!status.ok()) {
    return status;
  }
@@ -64,7 +66,11 @@ absl::Status RemoteUtil::Scp(std::vector<std::string> source_filepaths,
  std::string source_args;
  for (const std::string& sourceFilePath : source_filepaths) {
    // Workaround for scp thinking that C is a host in C:\path\to\foo.
-    source_args += QuoteArgument("//./" + sourceFilePath) + " ";
+    if (absl::StrContains(path::GetDrivePrefix(sourceFilePath), ":")) {
+      source_args += QuoteForWindows("//./" + sourceFilePath) + " ";
+    } else {
+      source_args += QuoteForWindows(sourceFilePath) + " ";
+    }
  }

  // -p preserves timestamps. This enables timestamp-based up-to-date checks.
@@ -73,66 +79,27 @@ absl::Status RemoteUtil::Scp(std::vector<std::string> source_filepaths,
      "%s "
      "%s %s -p -T "
      "-P %i %s "
-      "%s",
-      scp_command_, quiet_ || verbosity_ < 2 ? "-q" : "", compress ? "-C" : "",
-      ssh_port_, source_args, QuoteArgument(user_host_ + ":" + dest));
+      "%s:%s",
+      QuoteForWindows(scp_command_), quiet_ || verbosity_ < 2 ? "-q" : "",
+      compress ? "-C" : "", ssh_port_, source_args, QuoteForWindows(user_host_),
+      QuoteForWindows(dest));
  start_info.name = "scp";
  start_info.forward_output_to_log = forward_output_to_log_;

  return process_factory_->Run(start_info);
 }

-absl::Status RemoteUtil::Sync(std::vector<std::string> source_filepaths,
-                              const std::string& dest) {
-  absl::Status status = CheckHostPort();
-  if (!status.ok()) {
-    return status;
-  }
-
-  std::string source_args;
-  for (const std::string& sourceFilePath : source_filepaths) {
-    source_args += QuoteArgument(sourceFilePath) + " ";
-  }
-
-  ProcessStartInfo start_info;
-  start_info.command = absl::StrFormat(
-      "cdc_rsync --ip=%s --port=%i -z "
-      "%s %s%s",
-      QuoteArgument(user_host_), ssh_port_,
-      quiet_ || verbosity_ < 2 ? "-q " : " ", source_args, QuoteArgument(dest));
-  start_info.name = "cdc_rsync";
-  start_info.forward_output_to_log = forward_output_to_log_;
-
-  return process_factory_->Run(start_info);
-}
-
 absl::Status RemoteUtil::Chmod(const std::string& mode,
                               const std::string& remote_path, bool quiet) {
  std::string remote_command =
-      absl::StrFormat("chmod %s %s %s", QuoteArgument(mode),
-                      EscapeForWindows(remote_path), quiet ? "-f" : "");
+      absl::StrFormat("chmod %s %s %s", QuoteForSsh(mode),
+                      QuoteForSsh(remote_path), quiet ? "-f" : "");

  return Run(remote_command, "chmod");
 }

-absl::Status RemoteUtil::Rm(const std::string& remote_path, bool force) {
-  std::string remote_command = absl::StrFormat("rm %s %s", force ? "-f" : "",
-                                               EscapeForWindows(remote_path));
-
-  return Run(remote_command, "rm");
-}
-
-absl::Status RemoteUtil::Mv(const std::string& old_remote_path,
-                            const std::string& new_remote_path) {
-  std::string remote_command =
-      absl::StrFormat("mv %s %s", EscapeForWindows(old_remote_path),
-                      EscapeForWindows(new_remote_path));
-
-  return Run(remote_command, "mv");
-}
-
 absl::Status RemoteUtil::Run(std::string remote_command, std::string name) {
-  absl::Status status = CheckHostPort();
+  absl::Status status = CheckUserHostPort();
  if (!status.ok()) {
    return status;
  }
@@ -177,33 +144,61 @@ ProcessStartInfo RemoteUtil::BuildProcessStartInfoForSshInternal(
      "-oServerAliveCountMax=6 "  // Number of lost msgs before ssh terminates
      "-oServerAliveInterval=5 "  // Time interval between alive msgs
      "%s %s -p %i %s",
-      ssh_command_, quiet_ || verbosity_ < 2 ? "-q" : "", forward_arg,
-      QuoteArgument(user_host_), ssh_port_, remote_command_arg);
+      QuoteForWindows(ssh_command_), quiet_ || verbosity_ < 2 ? "-q" : "",
+      forward_arg, QuoteForWindows(user_host_), ssh_port_, remote_command_arg);
  start_info.forward_output_to_log = forward_output_to_log_;
  return start_info;
 }

-std::string RemoteUtil::EscapeForWindows(const std::string& argument) {
-  std::string str =
+std::string RemoteUtil::QuoteForWindows(const std::string& argument) {
+  // Escape certain backslashes (see doc of this function).
+  std::string escaped =
      std::regex_replace(argument, std::regex(R"(\\*(?="|$))"), "$&$&");
-  return std::regex_replace(str, std::regex(R"(")"), R"(\")");
+  // Escape " -> \".
+  escaped = std::regex_replace(escaped, std::regex(R"(")"), R"(\")");
+  // Quote.
+  return absl::StrCat("\"", escaped, "\"");
 }

-std::string RemoteUtil::QuoteArgument(const std::string& argument) {
-  return absl::StrCat("\"", EscapeForWindows(argument), "\"");
+std::string RemoteUtil::QuoteForSsh(const std::string& argument) {
+  // Escape \ ->: \\.
+  std::string escaped =
+      std::regex_replace(argument, std::regex(R"(\\)"), R"(\\)");
+  // Escape " -> \".
+  escaped = std::regex_replace(escaped, std::regex(R"(")"), R"(\")");
+
+  // Quote, but handle special case for ~.
+  if (escaped.empty() || escaped[0] != '~') {
+    return QuoteForWindows(absl::StrCat("\"", escaped, "\""));
+  }
+
+  // Simple special cases. Quote() isn't required, but called for consistency.
+  if (escaped == "~" || escaped == "~/") {
+    return QuoteForWindows(escaped);
+  }
+
+  // Check whether the username contains only valid characters.
+  // E.g. ~user name/foo -> Quote(~user name/foo)
+  size_t slash_pos = escaped.find('/');
+  size_t username_end_pos =
+      slash_pos == std::string::npos ? escaped.size() : slash_pos;
+  if (username_end_pos > 1 &&
+      !std::regex_match(escaped.substr(1, username_end_pos - 1),
+                        std::regex("^[a-z][-a-z0-9]*"))) {
+    return QuoteForWindows(absl::StrCat("\"", escaped, "\""));
+  }
+
+  if (slash_pos == std::string::npos) {
+    // E.g. ~username -> Quote(~username)
+    return QuoteForWindows(escaped);
+  }
+
+  // E.g.  or ~username/foo -> Quote(~username/"foo")
+  return QuoteForWindows(absl::StrCat(escaped.substr(0, slash_pos + 1), "\"",
+                                      escaped.substr(slash_pos + 1), "\""));
 }

-std::string RemoteUtil::QuoteArgumentForSsh(const std::string& argument) {
-  return absl::StrFormat(
-      "'%s'", std::regex_replace(argument, std::regex("'"), "'\\''"));
-}
-
-std::string RemoteUtil::QuoteAndEscapeArgumentForSsh(
-    const std::string& argument) {
-  return EscapeForWindows(QuoteArgumentForSsh(argument));
-}
-
-absl::Status RemoteUtil::CheckHostPort() {
+absl::Status RemoteUtil::CheckUserHostPort() {
  if (user_host_.empty() || ssh_port_ == 0) {
    return MakeStatus("IP or port not set");
  }
--- a/common/remote_util.h
+++ b/common/remote_util.h
@@ -61,25 +61,11 @@ class RemoteUtil {
  absl::Status Scp(std::vector<std::string> source_filepaths,
                   const std::string& dest, bool compress);

-  // Syncs |source_filepaths| to the remote folder |dest| on the gamelet using
-  // cdc_rsync. Must call SetUserHostAndPort before calling this method.
-  absl::Status Sync(std::vector<std::string> source_filepaths,
-                    const std::string& dest);
-
  // Calls 'chmod |mode| |remote_path|' on the gamelet.
  // Must call SetUserHostAndPort before calling this method.
  absl::Status Chmod(const std::string& mode, const std::string& remote_path,
                     bool quiet = false);

-  // Calls 'rm [-f] |remote_path|' on the gamelet.
-  // Must call SetUserHostAndPort before calling this method.
-  absl::Status Rm(const std::string& remote_path, bool force);
-
-  // Calls `mv |old_remote_path| |new_remote_path| on the gamelet.
-  // Must call SetUserHostAndPort before calling this method.
-  absl::Status Mv(const std::string& old_remote_path,
-                  const std::string& new_remote_path);
-
  // Runs |remote_command| on the gamelet. The command must be properly escaped.
  // |name| is the name of the command displayed in the logs.
  // Must call SetUserHostAndPort before calling this method.
@@ -107,28 +93,32 @@ class RemoteUtil {
  // Returns whether output is suppressed.
  bool Quiet() const { return quiet_; }

-  // Escapes command line argument for the Microsoft command line parser in
-  // preparation for quoting. Double quotes are backslash-escaped. One or more
-  // backslashes are backslash-escaped if they are followed by a double quote,
-  // or if they occur at the end of the string, e.g.
-  // foo\bar -> foo\bar, foo\ -> foo\\, foo\\"bar -> foo\\\\\"bar.
-  static std::string EscapeForWindows(const std::string& argument);
-
  // Quotes and escapes a command line argument following the convention
  // understood by the Microsoft command line parser.
-  static std::string QuoteArgument(const std::string& argument);
-
-  // Quotes and escapes a command line argument for usage in SSH.
-  static std::string QuoteArgumentForSsh(const std::string& argument);
+  // Double quotes are backslash-escaped. One or more backslashes are backslash-
+  // escaped if they are followed by a double quote, or if they occur at the end
+  // of the string, e.g.
+  // foo       -> "foo"
+  // foo\bar   -> "foo\bar"
+  // foo\      -> "foo\\"
+  // foo\\"bar -> "foo\\\\\"bar".
+  static std::string QuoteForWindows(const std::string& argument);

  // Quotes and escapes a command line arguments for use in SSH command. The
-  // argument is first escaped and quoted for Linux using single quotes and then
+  // argument is first escaped and quoted for Linux using double quotes and then
  // it is escaped to be used by the Microsoft command line parser.
-  static std::string QuoteAndEscapeArgumentForSsh(const std::string& argument);
+  // Properly supports path starting with ~ and ~username.
+  // foo       -> "\"foo\""
+  // foo\bar   -> "\"foo\bar\""
+  // foo\      -> "\"foo\\\\\""
+  // foo\"bar  -> "\"foo\\\\\\\"bar\"".
+  // ~/foo     -> "~/\"foo\""
+  // ~user/foo -> "~user/\"foo\""
+  static std::string QuoteForSsh(const std::string& argument);

 private:
-  // Verifies that both || and |ssh_port_| are set.
-  absl::Status CheckHostPort();
+  // Verifies that both |user_host_| and |ssh_port_| are set.
+  absl::Status CheckUserHostPort();

  // Common code for BuildProcessStartInfoForSsh*.
  ProcessStartInfo BuildProcessStartInfoForSshInternal(
--- a/common/remote_util_test.cc
+++ b/common/remote_util_test.cc
@@ -97,35 +97,40 @@ TEST_F(RemoteUtilTest, BuildProcessStartInfoForSshWithCustomCommand) {
  ExpectContains(si.command, {kCustomSshCmd});
 }

-TEST_F(RemoteUtilTest, EscapeForWindows) {
-  EXPECT_EQ("foo", RemoteUtil::EscapeForWindows("foo"));
-  EXPECT_EQ("foo bar", RemoteUtil::EscapeForWindows("foo bar"));
-  EXPECT_EQ("foo\\bar", RemoteUtil::EscapeForWindows("foo\\bar"));
-  EXPECT_EQ("\\\\foo", RemoteUtil::EscapeForWindows("\\\\foo"));
-  EXPECT_EQ("foo\\\\", RemoteUtil::EscapeForWindows("foo\\"));
-  EXPECT_EQ("foo\\\\\\\\", RemoteUtil::EscapeForWindows("foo\\\\"));
-  EXPECT_EQ("foo\\\"", RemoteUtil::EscapeForWindows("foo\""));
-  EXPECT_EQ("foo\\\"bar", RemoteUtil::EscapeForWindows("foo\"bar"));
-  EXPECT_EQ("foo\\\\\\\"bar", RemoteUtil::EscapeForWindows("foo\\\"bar"));
-  EXPECT_EQ("foo\\\\\\\\\\\"bar", RemoteUtil::EscapeForWindows("foo\\\\\"bar"));
-  EXPECT_EQ("\\\"foo\\\"", RemoteUtil::EscapeForWindows("\"foo\""));
-  EXPECT_EQ("\\\" \\file.txt", RemoteUtil::EscapeForWindows("\" \\file.txt"));
+TEST_F(RemoteUtilTest, QuoteForWindows) {
+  EXPECT_EQ(RemoteUtil::QuoteForWindows("foo"), "\"foo\"");
+  EXPECT_EQ(RemoteUtil::QuoteForWindows("foo bar"), "\"foo bar\"");
+  EXPECT_EQ(RemoteUtil::QuoteForWindows("foo\\bar"), "\"foo\\bar\"");
+  EXPECT_EQ(RemoteUtil::QuoteForWindows("\\\\foo"), "\"\\\\foo\"");
+  EXPECT_EQ(RemoteUtil::QuoteForWindows("foo\\"), "\"foo\\\\\"");
+  EXPECT_EQ(RemoteUtil::QuoteForWindows("foo\\\\"), "\"foo\\\\\\\\\"");
+  EXPECT_EQ(RemoteUtil::QuoteForWindows("foo\""), "\"foo\\\"\"");
+  EXPECT_EQ(RemoteUtil::QuoteForWindows("foo\"bar"), "\"foo\\\"bar\"");
+  EXPECT_EQ(RemoteUtil::QuoteForWindows("foo\\\"bar"), "\"foo\\\\\\\"bar\"");
+  EXPECT_EQ(RemoteUtil::QuoteForWindows("foo\\\\\"bar"),
+            "\"foo\\\\\\\\\\\"bar\"");
+  EXPECT_EQ(RemoteUtil::QuoteForWindows("\"foo\""), "\"\\\"foo\\\"\"");
+  EXPECT_EQ(RemoteUtil::QuoteForWindows("\" \\file.txt"),
+            "\"\\\" \\file.txt\"");
 }

-TEST_F(RemoteUtilTest, QuoteArgument) {
-  EXPECT_EQ("\"foo\"", RemoteUtil::QuoteArgument("foo"));
-  EXPECT_EQ("\"foo bar\"", RemoteUtil::QuoteArgument("foo bar"));
-  EXPECT_EQ("\"foo\\bar\"", RemoteUtil::QuoteArgument("foo\\bar"));
-  EXPECT_EQ("\"\\\\foo\"", RemoteUtil::QuoteArgument("\\\\foo"));
-  EXPECT_EQ("\"foo\\\\\"", RemoteUtil::QuoteArgument("foo\\"));
-  EXPECT_EQ("\"foo\\\\\\\\\"", RemoteUtil::QuoteArgument("foo\\\\"));
-  EXPECT_EQ("\"foo\\\"\"", RemoteUtil::QuoteArgument("foo\""));
-  EXPECT_EQ("\"foo\\\"bar\"", RemoteUtil::QuoteArgument("foo\"bar"));
-  EXPECT_EQ("\"foo\\\\\\\"bar\"", RemoteUtil::QuoteArgument("foo\\\"bar"));
-  EXPECT_EQ("\"foo\\\\\\\\\\\"bar\"",
-            RemoteUtil::QuoteArgument("foo\\\\\"bar"));
-  EXPECT_EQ("\"\\\"foo\\\"\"", RemoteUtil::QuoteArgument("\"foo\""));
-  EXPECT_EQ("\"\\\" \\file.txt\"", RemoteUtil::QuoteArgument("\" \\file.txt"));
+TEST_F(RemoteUtilTest, QuoteForSsh) {
+  EXPECT_EQ(RemoteUtil::QuoteForSsh("foo"), "\"\\\"foo\\\"\"");
+  EXPECT_EQ(RemoteUtil::QuoteForSsh("foo\\bar"), "\"\\\"foo\\\\bar\\\"\"");
+  EXPECT_EQ(RemoteUtil::QuoteForSsh("foo\\"), "\"\\\"foo\\\\\\\\\\\"\"");
+  EXPECT_EQ(RemoteUtil::QuoteForSsh("foo\\\"bar"),
+            "\"\\\"foo\\\\\\\\\\\\\\\"bar\\\"\"");
+  EXPECT_EQ(RemoteUtil::QuoteForSsh("~"), "\"~\"");
+  EXPECT_EQ(RemoteUtil::QuoteForSsh("~username"), "\"~username\"");
+  EXPECT_EQ(RemoteUtil::QuoteForSsh("~/foo"), "\"~/\\\"foo\\\"\"");
+  EXPECT_EQ(RemoteUtil::QuoteForSsh("~username/foo"),
+            "\"~username/\\\"foo\\\"\"");
+  EXPECT_EQ(RemoteUtil::QuoteForSsh("~invalid user name"),
+            "\"\\\"~invalid user name\\\"\"");
+  EXPECT_EQ(RemoteUtil::QuoteForSsh("~invalid user name/foo"),
+            "\"\\\"~invalid user name/foo\\\"\"");
+  EXPECT_EQ(RemoteUtil::QuoteForSsh("~user-name69/foo"),
+            "\"~user-name69/\\\"foo\\\"\"");  // Nice!
 }

 }  // namespace
--- a/data_store/data_provider_test.cc
+++ b/data_store/data_provider_test.cc
@@ -14,14 +14,12 @@

 #include "data_store/data_provider.h"

-#include <chrono>
 #include <numeric>
 #include <thread>

 #include "common/path.h"
 #include "common/status_test_macros.h"
 #include "common/testing_clock.h"
-#include "common/util.h"
 #include "data_store/disk_data_store.h"
 #include "data_store/mem_data_store.h"
 #include "gtest/gtest.h"
--- a/proto/local_assets_stream_manager.proto
+++ b/proto/local_assets_stream_manager.proto
@@ -25,35 +25,50 @@ service LocalAssetsStreamManager {
  rpc StopSession(StopSessionRequest) returns (StopSessionResponse) {}
 }

-// NextID: 7
+// NextID: 12
 message StartSessionRequest {
-  // ID of assets streaming target gamelet. gamelet_id will continue to be set
-  // alongside gamelet_name for backwards compatibility, but new code should
-  // not read from the gamelet_id field.
-  string gamelet_id = 1;
  // The resource name of the assets streaming target gamelet, in the form
  // "organizations/{org-id}/projects/{proj-id}/pools/{pool-id}/gamelets/{gamelet-id}".
-  // If gamelet_name is specified, it will take precedence over gamelet_id.
+  // Only used by Stadia. Should set either this or user_host.
  string gamelet_name = 5;
-  // Path in the local workstation to stream assets from.
+  // Directory in the local workstation to stream assets from.
  string workstation_directory = 2;
-  // The user's email.
-  string account = 3;
-  // The OnePlatForm Url of the publishing API.
-  string url = 4;
-  // Caller of the SartSession request.
+  // Caller of the StartSession request.
+  // Only used by Stadia. May be left unspecified.
  enum Origin {
    ORIGIN_UNKNOWN = 0;
    ORIGIN_CLI = 1;
    ORIGIN_PARTNER_PORTAL = 2;
  }
  Origin origin = 6;
+  // Username and host, in the form [user@]host.
+  string user_host = 7;
+  // Remote directory where to mount the streamed directory.
+  string mount_dir = 8;
+  // SSH port to use while connecting to the remote instance.
+  // Optional, falls back to port 22 (default SSH port).
+  int32 port = 9;
+  // SSH command to connect to the remote instance.
+  // Optional, falls back to searching ssh.
+  string ssh_command = 10;
+  // SCP command to copy files to the remote instance.
+  // Optional, falls back to searching scp.
+  string scp_command = 11;
+
+  reserved 1, 3, 4;
 }

 message StartSessionResponse {}

+// NextID: 4
 message StopSessionRequest {
+  // ID of assets streaming target gamelet.
+  // Only used by Stadia. Should set either this or user_host_dir.
  string gamelet_id = 1;
+  // Username and host, in the form [user@]host.
+  string user_host = 2;
+  // Remote directory where the streamed directory is mounted.
+  string mount_dir = 3;
 }

 message StopSessionResponse {}
--- a/tests_asset_streaming_30/BUILD
+++ b/tests_asset_streaming_30/BUILD
@@ -28,6 +28,7 @@ cc_binary(
        "//asset_stream_manager:multi_session",
        "//cdc_fuse_fs:asset",
        "//cdc_fuse_fs:cdc_fuse_fs_lib_mocked",
+        "//cdc_fuse_fs:mock_config_stream_client",
        "//common:test_main",
        "//common:testing_clock",
        "//data_store:data_provider",
--- a/tests_asset_streaming_30/tests_asset_streaming_30.vcxproj
+++ b/tests_asset_streaming_30/tests_asset_streaming_30.vcxproj
@@ -62,7 +62,6 @@
    <BazelTargets>//tests_asset_streaming_30</BazelTargets>
    <BazelOutputFile>tests_asset_streaming_30.exe</BazelOutputFile>
    <BazelIncludePaths>..\;..\third_party\absl;..\third_party\jsoncpp\include;..\third_party\blake3\c;..\third_party\googletest\googletest\include;..\third_party\protobuf\src;..\third_party\grpc\include;..\bazel-out\x64_windows-dbg\bin;$(VC_IncludePath);$(WindowsSDK_IncludePath)</BazelIncludePaths>
-    <BazelSourcePathPrefix>..\/</BazelSourcePathPrefix>
  </PropertyGroup>
  <Import Project="..\NMakeBazelProject.targets" />
  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
--- a/tests_cdc_rsync/tests_cdc_rsync.vcxproj
+++ b/tests_cdc_rsync/tests_cdc_rsync.vcxproj
@@ -63,7 +63,6 @@
    <BazelTargets>//tests_cdc_rsync</BazelTargets>
    <BazelOutputFile>tests_cdc_rsync.exe</BazelOutputFile>
    <BazelIncludePaths>..\;..\third_party\absl;..\third_party\jsoncpp\include;..\bazel-stadia-file-transfer\external\com_github_zstd\lib;..\third_party\blake3\c;..\third_party\googletest\googletest\include;..\third_party\protobuf\src;..\third_party\grpc\include;..\bazel-out\x64_windows-dbg\bin;$(VC_IncludePath);$(WindowsSDK_IncludePath)</BazelIncludePaths>
-    <BazelSourcePathPrefix>..\/</BazelSourcePathPrefix>
  </PropertyGroup>
  <Import Project="..\NMakeBazelProject.targets" />
  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
--- a/tests_common/tests_common.vcxproj
+++ b/tests_common/tests_common.vcxproj
@@ -62,7 +62,6 @@
    <BazelTargets>//tests_common</BazelTargets>
    <BazelOutputFile>tests_common.exe</BazelOutputFile>
    <BazelIncludePaths>..\;..\third_party\absl;..\third_party\jsoncpp\include;..\third_party\blake3\c;..\third_party\googletest\googletest\include;..\third_party\protobuf\src;..\third_party\grpc\include;..\bazel-out\x64_windows-dbg\bin;$(VC_IncludePath);$(WindowsSDK_IncludePath)</BazelIncludePaths>
-    <BazelSourcePathPrefix>..\/</BazelSourcePathPrefix>
  </PropertyGroup>
  <Import Project="..\NMakeBazelProject.targets" />
  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />