106 lines
4.6 KiB
Markdown
106 lines
4.6 KiB
Markdown
# first-boot.sh — Documentation
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This script runs once on first boot via cloud-init (see `user-data-remote-gnss.example`). It installs packages, configures a Chromium kiosk with KDE Plasma and touch support, and installs the reTerminal DM display/touch drivers. It must run as **root**.
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---
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## Script header and environment
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- **`set -e`** — Exit immediately if any command fails.
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- **`DEBIAN_FRONTEND=noninteractive`** — Prevents apt from asking questions (assumes default or automatic answers).
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---
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## Packages
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Installs the software needed for the rest of the script and for the kiosk:
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| Package | Purpose |
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|--------|---------|
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| **git** | Clone the Seeed Linux DTOverlays repo for reTerminal DM drivers. |
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| **chromium-browser** | Full-screen kiosk browser. |
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| **wmctrl** | Window control; used to force Chromium into fullscreen. |
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| **openssh-server** | SSH access (often also enabled in user-data). |
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| **kde-plasma-desktop** | KDE Plasma desktop (X11 session used for Chromium). |
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| **maliit-keyboard** | On-screen keyboard for touch input. |
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| **xinput-calibrator** | Touchscreen calibration (optional; run manually if needed). |
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---
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## Autostart directory
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Creates `/home/pi/.config/autostart` so that `.desktop` files placed there are started when user `pi` logs into the graphical session.
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---
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## Chromium kiosk files (from file server)
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Does **not** create the kiosk files locally; it downloads them from your file server:
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- **`FILE_SERVER`** — Base URL (default: `http://10.130.60.141:5000/files`). Change this if your server is elsewhere.
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- **`start-chromium.sh`** — Downloaded to `/home/pi/start-chromium.sh`, made executable (755), owned by `pi`. This script waits for the desktop, starts Chromium in kiosk mode (e.g. `--app=...`), and uses `wmctrl` to force fullscreen.
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- **`chromium-kiosk.desktop`** — Downloaded to `/home/pi/.config/autostart/chromium-kiosk.desktop`, mode 644, owned by `pi`. This autostart entry runs `start-chromium.sh` when `pi` logs in.
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Ensure the `.desktop` file on the server has `Exec=/home/pi/start-chromium.sh` (or the path you use on the device).
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---
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## KDE Plasma: default session (X11)
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Writes `/etc/lightdm/lightdm.conf.d/99-default-session.conf` so the display manager (LightDM) uses the **Plasma X11** session (`plasmax11`) instead of Wayland. Chromium kiosk is configured for X11, so this is required for it to run correctly.
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---
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## KDE touch-friendly settings
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Two config files for user `pi` to improve touch and window behaviour:
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- **`/home/pi/.config/kdeglobals`** — `ForceFontDPI=120` for larger, more readable UI on the small screen.
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- **`/home/pi/.config/kwinrc`** — `BorderlessMaximizedWindows=true` and `touchpointsEnabled=true` for better touch and fullscreen behaviour.
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Both are owned by `pi:pi` with mode 644.
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---
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## On-screen keyboard (Maliit)
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Creates `/home/pi/.config/autostart/maliit-keyboard.desktop` so that **Maliit** (`maliit-keyboard -r`) starts when `pi` logs in. This gives an on-screen keyboard for touch-only use.
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---
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## Ownership for pi’s config
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Runs `chown -R pi:pi /home/pi/.config` so all files under `pi`’s config directory are owned by `pi`. Ensures the desktop session runs as `pi` without permission issues.
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---
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## Default X session manager
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Runs `update-alternatives --set x-session-manager /usr/bin/startplasma-x11` so the default graphical session is KDE Plasma on X11. Matches the LightDM setting above and ensures the kiosk and Maliit run in the same X11 session.
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---
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## reTerminal DM: Seeed display/touch drivers
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Installs the official Seeed drivers for the reTerminal DM so the display and touch work:
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1. Clones **https://github.com/Seeed-Studio/seeed-linux-dtoverlays** into `/tmp/seeed-linux-dtoverlays` (`--depth 1` for a shallow clone).
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2. Runs **`scripts/reTerminal.sh --device reTerminal-DM`** to install device-tree overlays and any required firmware/config for the reTerminal DM.
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3. Removes the clone from `/tmp`.
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These changes take effect after a reboot.
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---
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## Reboot
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Runs **`reboot`** so the kernel and display stack load the new Seeed drivers. After reboot, the screen and touch should work, and the next login as `pi` will start the Chromium kiosk and Maliit via the autostart entries.
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---
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## Customisation
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- **File server** — Edit `FILE_SERVER` if your `start-chromium.sh` and `chromium-kiosk.desktop` are served from another host/port.
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- **Kiosk URL** — The URL Chromium opens is defined in `start-chromium.sh` on your file server (e.g. `--app=http://127.0.0.1:8080`); change it there.
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- **User** — If you use a user other than `pi`, replace `pi` in this script and in the files on the file server (paths and ownership).
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