feat(tui): interactive terminal attach for tty exec sessions - #1055
feat(tui): interactive terminal attach for tty exec sessions#1055anandh8x wants to merge 13 commits into
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Zero automated PR reviewVerdict: No blockers found Blockers
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Greptile SummaryThis PR adds interactive attachment to retained tty exec sessions, including automatic attachment, direct key and paste forwarding, PTY resizing, terminal-session lifecycle notices, and the
Confidence Score: 1/5This PR is not safe to merge because full-screen terminal output and bracketed paste are handled incorrectly, and auto-attachment can capture the wrong active surface or fail entirely under BTW. Four independent behavioral failures affect the core terminal contract: cursor-addressed output is not emulated, child bracketed-paste framing is lost, viewport-owning states are not consistently deferred, and parent auto-attach polling is dropped while BTW is visible. Files Needing Attention: internal/tui/terminal_attach.go, internal/tui/model.go, internal/tui/btw.go
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| Filename | Overview |
|---|---|
| internal/tui/terminal_attach.go | Implements terminal attachment, input translation, auto-attach polling, and rendering, but lacks terminal-state emulation and has modal and BTW routing failures. |
| internal/tui/model.go | Integrates attachment into message, keyboard, rendering, resize, and run lifecycle paths; overlapping surface priorities expose the phantom-attachment case. |
| internal/tui/btw.go | Routes the tty-start event to a hidden parent but cannot route the subsequent markerless polling ticks. |
| internal/execution/process_manager.go | Adds non-draining PTY input and resize operations with focused tests. |
| internal/execution/pty_linux.go | Seeds PTYs at 80x24 and adds Linux window-size updates. |
| internal/tools/exec_command.go | Exposes session input and resize controls and adds model-facing interactive-session guidance. |
| internal/tui/background_terminals.go | Adds /attach selection, validation, and discoverability to background terminal management. |
Flowchart
%%{init: {'theme': 'neutral'}}%%
flowchart TD
A[Agent invokes exec_command tty:true] --> B[interactiveExecStartMsg]
B --> C[Arm auto-attach watcher]
C --> D[Process manager registers PTY session]
D --> E{Viewport available?}
E -- No --> C
E -- Yes --> F[Open terminal attachment]
F --> G[Resize PTY to viewport]
F --> H[Forward keys and paste]
F --> I[Poll RecentOutput]
I --> J{Session running?}
J -- Yes --> I
J -- No --> K[Close attachment and show notice]
F --> L[Esc detaches while process continues]
Reviews (1): Last reviewed commit: "feat(tools): route sudo through an escal..." | Re-trigger Greptile
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| } | ||
| resolved = runes | ||
| } | ||
| stripped := ansi.Strip(string(resolved)) |
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The attached view strips cursor-positioning, erase, and alternate-screen sequences instead of applying them to terminal state. When a full-screen program such as top, an editor, or a curses installer redraws the screen, the view therefore shows stale, concatenated, or blank text. This breaks the interactive terminal behavior that the new PTY resizing is intended to support. Use a stateful terminal screen buffer rather than sanitizing the rolling raw-output tail.
Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!
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Acknowledged, and deliberately out of scope for this PR. The attached view is a line-oriented tail for prompts, confirmations, and progress output (carriage-return overwrites are handled); a stateful VT screen for cursor-addressed/alt-screen programs like top or curses installers needs a terminal emulator, which is a new dependency and its own change. I have trimmed the description so it no longer claims curses layouts, and left the PTY resize in since line-oriented programs (wrapping, progress-bar width) still need the real size. Will open a follow-up for the screen buffer.
| if content == "" { | ||
| return m, nil | ||
| } | ||
| return m.writeTerminalAttachInput(state, []byte(content)), nil |
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tea.PasteMsg.Content contains the paste payload after Bubble Tea has consumed the outer terminal's bracketed-paste framing, but this handler writes only that payload to the child PTY. When the child application has enabled bracketed paste, multiline or control-bearing pasted text is treated as ordinary keystrokes and may execute immediately instead of being inserted as a paste. Track the child's terminal mode and restore the ESC[200~ and ESC[201~ framing when bracketed paste is enabled.
| if !session.TTY || session.Status != "running" || state.known[session.ID] || m.terminalAttachSeen[session.ID] { | ||
| continue | ||
| } | ||
| if !m.noBlockingModalExceptAttach() || m.terminalAttach != nil { |
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The auto-attach modal gate omits active viewport owners such as the help overlays, run-details view, and subchat. If a tty session registers while one of these is open, auto-attach can unexpectedly replace that surface. In a subchat, the terminal overlay is not rendered at all, but its keyboard handler still captures every key and forwards it to the PTY. Include every keyboard- or viewport-owning state in the deferral gate.
| runID int | ||
| } | ||
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| type terminalAutoAttachTickMsg struct{} |
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Auto-attach polling cannot continue for a hidden parent run while /btw is active. The run-scoped start message reaches the parent and schedules this tick, but the tick has no run ID, so it is delivered to the visible side model and cannot be routed back. The side drops it, and leaving /btw does not restart polling, so a tty session started by the parent never auto-attaches.
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Included review availability: Your plan provides up to 4 included reviews per hour; 1 remains after this review. WalkthroughThe PR adds PTY input and resize APIs, exposes them through execution sessions, and adds manual and automatic ChangesInteractive terminal attachment
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~60 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant User
participant TUI
participant ExecSessionController
participant ProcessManager
participant PTY
User->>TUI: Enter /attach or type input
TUI->>ExecSessionController: Lookup session or write input
ExecSessionController->>ProcessManager: Execute session operation
ProcessManager->>PTY: Write bytes or resize window
PTY-->>TUI: Updated session snapshot
TUI-->>User: Render terminal attach overlay
Suggested reviewers: Merge Risk: 🟡 Moderate · up to Full-screen interactive programs can display stale or incorrectly positioned content in the new attach view. This should be addressed before merging interactive terminal support. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Actionable comments posted: 4
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Inline comments:
In `@internal/tools/exec_command.go`:
- Line 101: Update the interactive-command guard in exec_command before creating
execExecutionRequest to account for ttyRequested, allowing approved TTY commands
such as interactivePrograms entries for ssh without a remote command to proceed
to PTY allocation instead of returning interactiveBlockResult; preserve blocking
for interactive commands that are not authorized for TTY use.
In `@internal/tui/model.go`:
- Around line 1587-1596: Capture the terminal auto-attach session baseline
before tea.Program.Send queues interactiveExecStartMsg, so the newly started
exec session cannot be included in known. Update the flow around
terminalAutoAttachState and pollTerminalAutoAttach to preserve the pre-start
session IDs, or propagate the created session ID from the execution layer and
exclude only that ID.
In `@internal/tui/terminal_attach.go`:
- Around line 336-350: Update the attach rendering flow around
renderTerminalTail and sanitizeTerminalLine to use a stateful VT emulator
instead of stripping ANSI sequences and control runes. Preserve emulator state
across refreshes, apply PTY resize updates, and render the emulator’s current
screen so cursor movement, erasure, screen clearing, and alternate-screen
behavior are reflected in the overlay.
- Around line 247-253: Update handleTerminalAttachPaste and the terminal-attach
state to track the child PTY’s bracketed-paste mode from captured ESC[?2004h and
ESC[?2004l output. When enabled, wrap tea.PasteMsg.Content with ESC[200~ and
ESC[201~ before writeTerminalAttachInput; when disabled, preserve the current
raw-content behavior, and add tests covering both modes.
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📒 Files selected for processing (19)
internal/execution/process_manager.gointernal/execution/process_manager_test.gointernal/execution/pty_fallback.gointernal/execution/pty_linux.gointernal/tools/exec_command.gointernal/tools/exec_command_test.gointernal/tui/attachment_preview.gointernal/tui/background_terminals.gointernal/tui/background_terminals_test.gointernal/tui/btw.gointernal/tui/commands.gointernal/tui/commands_test.gointernal/tui/model.gointernal/tui/mouse.gointernal/tui/pets.gointernal/tui/session_test.gointernal/tui/terminal_attach.gointernal/tui/terminal_attach_test.gointernal/tui/transcript_selection.go
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1 participant
Summary
Commands that prompt for input (
sudo,ssh, interactive installers) used to dead-end: the agent could start them withexec_command tty:true, but nothing in the TUI let the user answer the prompt, so the agent ended up asking the user to run the command themselves.This adds a general interactive-terminal surface for tty exec sessions. No password-specific handling: keystrokes go straight into the PTY, the command's own no-echo does the masking, and Zero never sees, stores, or logs what was typed.
exec_commandwithtty:true, the TUI watches for the new session and opens the terminal on it as soon as it registers (deferred while a permission prompt or another modal owns the screen; sessions that existed before the call, or that the user already detached from, are never picked; gives up after 60s).● Terminal <cmd> [running]box fills the transcript viewport, output top-aligned, hints inside the box; the composer is hidden while attached (only the status line stays). The PTY is resized to the box (and on window resize) so wrapping and progress-bar widths match the box. The view is a line-oriented tail (carriage-return overwrites handled, ANSI stripped); cursor-addressed full-screen programs are not emulated in this PR. Fresh PTYs are also seeded 80x24 instead of 0x0.0x03instead of triggering Zero's exit confirmation. Esc detaches. Mouse is swallowed while attached.Terminal session N finished (exit K)./ended.notice./attach [session_id]re-attaches after Esc (bare/attachpicks the only tty session, lists them if several)./psand the footer advertise it.ProcessManager.WriteInput(stdin write that does not drain the output buffer, so a concurrentwrite_stdinpoll still sees everything) andProcessManager.ResizeInput;ExecSessionControllergainsExecSession,WriteExecSessionInput,ResizeExecSession.ttydescription points at prompting commands and notes that setuid tools likesudoalso needsandbox_permissions: "require_escalated"(the sandbox'sno_new_privskills sudo before it prompts; a failing result with that message now carries a retry hint). The still-running tty result tells the model the user is already typing into the terminal: keep polling withwrite_stdinuntil exit, do not end the turn, never ask for the password in chat.Manually tested end to end with a real
sudoprompt in the TUI, plus a hermetic termctrl run against agetpassstand-in (same no-echo/dev/ttypath as sudo):After typing the password (nothing echoed) + Enter:
Linked issue
Internal development (team PR), no parent issue.
Checklist
issue-approvedlabel. (N/A: team PR)go build ./...,go vet ./..., andgo test ./...pass locally.gofmtclean.-racewhere relevant).Validation run:
make fmt-check,go vet ./...,go test ./...,go test -race ./internal/execution/ ./internal/tui/ ./internal/tools/,go run ./cmd/zero-release build,go run ./cmd/zero-release smoke,make lint-static(no new findings),make vulncheck,git diff HEAD --check.Note: locally
TestEmptyStateCollapsesAfterFirstPromptfails only because this branch's name contains "interactive" and the title bar renders the branch; it passes on a detached checkout of the same commit, and CI checks out detached.Summary by CodeRabbit
New Features
/attachto connect to running interactive terminal sessions.tty:true.Bug Fixes