* feat(exec): add bidirectional streaming for interactive TTY sessions
The existing ExecSandbox RPC sends stdin upfront in the request body,
making interactive programs (bash, top, vim) unusable with --tty. This
adds an ExecSandboxInteractive bidirectional streaming RPC that forwards
live keystrokes, terminal resize events, and EOF to the sandbox.
- Add ExecSandboxInteractive RPC, ExecSandboxInput and
ExecSandboxWindowResize messages to the proto definition
- Implement server handler with relay bridging, PTY allocation via
russh channel.split(), and timeout support
- Implement CLI client with raw mode, spawn_blocking stdin reader,
SIGWINCH resize forwarding, and process::exit for clean shutdown
- Route to interactive path only when --tty is explicitly passed
Signed-off-by: Florent Benoit <fbenoit@redhat.com>
* fix(exec): address interactive TTY streaming review feedback
Server-side (sandbox.rs):
- Close SSH channel after EOF so PTY-backed programs (bash, vim, top)
terminate on client disconnect instead of leaking the session
- Break output loop when tx.send() fails (client gone) to tear down
the streaming pipeline promptly
- Default zero cols/rows to 80x24 before request_pty, matching the
proto "0 = use default" contract and preventing 1x1 terminals for
non-CLI clients
Client-side (run.rs):
- Replace spawn_blocking stdin reader with a detached std::thread so
the tokio runtime shutdown does not hang on a thread blocked in
stdin.read(). This removes the need for std::process::exit(),
allowing save_last_sandbox() in the caller to execute normally
- Switch from futures::channel::mpsc with try_send() to
tokio::sync::mpsc with blocking_send() for proper backpressure —
try_send silently stopped forwarding all input when the channel
filled during paste or slow network
- Add TaskGuard (abort-on-drop) for the resize task to ensure cleanup
on all return paths including early errors
---------
Signed-off-by: Florent Benoit <fbenoit@redhat.com>
John T. Myers