dsh-restart-button

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A self-contained power control plugin for DeepSeek Harness: a power button in the sidebar footer with an upward Restart / Shutdown menu and a full-screen transition overlay. The restart & shutdown engine is built into this plugin — no dependency on other plugins.

Developed with DeepSeek AI assistance, reviewed before release.

Features

• Power button in the sidebar footer (sidebar.footer.action), styled to match the adjacent Settings trigger (34px row, theme tokens — follows light/dark).
• Upward menu: Restart / Shutdown, closes on outside click or Esc.
• Restart: writes a .cjs helper → spawns node <file> detached (no console window) → waits for the port to free → relaunches DSH with the same execPath/execArgv/argv/cwd, then terminates the old process after the response flushes.
• Shutdown: terminates the process without relaunching.
• Overlay: Windows-shutdown-style transition screen with ring progress and stage captions; auto-reload after restart.
• restart_harness model tool: same name as anweat/dsh-restart, provided by this plugin when installed alone; skipped if another plugin already owns the name.

Install

dsh plugin --profile web add "github:keyiadiannao/dsh-restart-button#master"

Restart DSH; a power button appears in the sidebar footer. Requires Node ≥ 22.19.

How it works

click power → menu → Restart
[host]    POST /api/dsh-restart-button/restart
          → write $USERPROFILE/.dsh/restart-helper-<pid>-<ts>.cjs
          → spawn `node <helper>` (detached, windowsHide)
[helper]  wait for old PID to exit → wait for port to free
          → spawn DSH again with same execPath/argv/cwd → self-delete
[host]    terminate after the HTTP response flushes
[client]  poll health → confirm new instanceId → auto reload

Shutdown posts /api/dsh-restart-button/shutdown and terminates without relaunching.

Design notes (from real issues hit in development):

• The helper must be outside the process tree (detached + unref), otherwise killing DSH kills the helper too.
• The helper is a real .cjs file, not node -e: multi-line node -e scripts get mangled by Windows CreateProcess and die with a silent SyntaxError.

Safety

• Destructive POSTs are protected by a same-origin / loopback guard (CSRF).
• An at-most-once latch prevents duplicate restarts from concurrent requests (a second POST gets 409).
• Restart success is confirmed by the per-process instanceId changing (old → new), not just a transient down.

Development

npm run build        # tsdown: host + client bundle
npm run typecheck    # tsc --noEmit

Artifacts: host at lib/index.js, client bundle at lib/client.js (committed — git installs build-free).

License & Attribution

MIT. The "detached helper relaunch" idea follows anweat/dsh-restart (MIT); the implementation is independently written (real .cjs file, no PowerShell, dynamic port), no code copied.