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feat(ipc): display control socket, stage 1 - on-demand with acks (#706)

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The display serves a control socket (/run/ledmatrix/control.sock) carrying versioned JSON commands, one per line, each answered. Stage 1 covers on-demand start, stop and status; commands are queued on the socket thread and applied on the render thread through the mailbox's own handler, and the web interface falls back to the file mailbox when the socket is unavailable. Protocol and security model: docs/IPC_CONTROL_SOCKET.md.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Chuck
2026-10-01 10:33:02 -04:00
committed by GitHub
co-authored by Claude Opus 5.5
parent 74696d2108
commit 695ff92009
18 changed files with 3158 additions and 42 deletions
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docs/PERMISSIONS.md
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@@ -29,6 +29,8 @@ in again (services pick them up on restart).
| `assets/` | web user | dirs `755`, files `644` | Root writes downloaded logos regardless |
| `/var/cache/ledmatrix/` | `root:ledmatrix` | `2775` (setgid) | Shared cache: see below |
| Cache files | creator : `ledmatrix` | `660` | |
| `/run/ledmatrix/` | `root` | `755` | tmpfs; `RuntimeDirectory=` in `ledmatrix.service`, removed when the display stops |
| `/run/ledmatrix/control.sock` | `root` : cache directory's group (`ledmatrix`) | `660` | The display's control socket; only root and that group can connect. See [IPC_CONTROL_SOCKET.md](IPC_CONTROL_SOCKET.md#security-model) |
| `scripts/fix_perms/safe_plugin_rm.sh`, `safe_pip_install.sh` | `root:root` | `755` | Run as root through sudo, so the web user must not be able to edit them |
| `/etc/sudoers.d/ledmatrix_web`, `ledmatrix_wifi` | `root` | `440` | |