Martin Bauer
8c225bbe06
A reboot kills Chromium rather than closing it, so it writes "exit_type":"Crashed" into its profile. On the next boot it came up with a restore prompt and a tab stuck for ever on a blank "Loading..." page - navigation never committed, navigator.serviceWorker was still undefined, nothing on screen. On a device with a monitor and no keyboard that is permanent, and the backend was healthy throughout: / answered in 5 ms and /api/library returned 812 kB the whole time. --disable-session-crashed-bubble hides the prompt but not the state behind it, and here the prompt showed anyway. .xinitrc now rewrites exit_type and exited_cleanly before launching, which is the usual remedy for a kiosk that gets powered off rather than shut down, and adds --hide-crash-restore-bubble (the current name for the flag). Verified by rebooting and leaving it alone: the page comes up on its own with its title and its content. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
79 lines
3.7 KiB
Django/Jinja
79 lines
3.7 KiB
Django/Jinja
#!/bin/sh
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# Managed by ansible (pi_kiosk role).
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#
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# Openbox is here for one concrete reason: a browser asks to be full-screen over EWMH,
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# and only a window manager answers that request. With no WM running, --kiosk was
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# silently ignored and the browser fell back to its default window size in the
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# top-left corner of a 1920x1080 screen - black bands down the right edge and along
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# the bottom, looking exactly like an overscan problem and not being one.
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xset s off
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xset -dpms
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xset s noblank
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{% if pi_kiosk_browser == 'chromium' %}
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BROWSER=chromium
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# The first four flags are the difference between compositing on the GPU and
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# rasterizing every frame on the CPU:
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# --use-gl=egl reach V3D through EGL rather than desktop GLX
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# --enable-gpu-rasterization rasterize layer content on the GPU
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# --ignore-gpu-blocklist Chromium's blocklist does not know this driver, and
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# without this it quietly falls back to software
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# --enable-zero-copy hand tiles to the compositor without a CPU copy
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# The rest are about a machine nobody sits in front of: no update checks, no crash
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# bubbles, no keyring prompt, no first-run wizard, no "restore pages?" after a power
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# cut. Anything policy-shaped rather than flag-shaped is in
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# /etc/chromium/policies/managed/.
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BROWSER_ARGS="--use-gl=egl --enable-gpu-rasterization --ignore-gpu-blocklist --enable-zero-copy"
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BROWSER_ARGS="$BROWSER_ARGS --noerrdialogs --disable-infobars --no-first-run"
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BROWSER_ARGS="$BROWSER_ARGS --no-default-browser-check --disable-session-crashed-bubble"
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BROWSER_ARGS="$BROWSER_ARGS --password-store=basic --check-for-update-interval=31536000"
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BROWSER_ARGS="$BROWSER_ARGS --hide-crash-restore-bubble"
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# Chromium records in its profile how it last exited. A reboot kills it rather than
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# closing it, so that record says "Crashed", and the next start comes up with a restore
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# prompt and a tab stuck on a blank "Loading..." page - which, on a device with no
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# keyboard in front of it, it never leaves. The flags above hide the prompt but do not
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# clear the state behind it; rewriting the two keys before launch does, and is the
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# standard remedy for a kiosk that is powered off rather than shut down.
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PREFS="$HOME/.config/chromium/Default/Preferences"
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if [ -f "$PREFS" ]; then
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sed -i 's/"exit_type":"[^"]*"/"exit_type":"Normal"/; s/"exited_cleanly":false/"exited_cleanly":true/' "$PREFS"
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fi
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{% if pi_kiosk_mode == 'debug' %}
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# Debug mode only. Binds to 127.0.0.1, so it is reachable over an ssh tunnel and from
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# nowhere else. Lets the page be driven and measured from a shell - `curl
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# localhost:9222/json` lists the tabs - instead of by poking XTEST key events at a
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# window and hoping they land.
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BROWSER_ARGS="$BROWSER_ARGS --remote-debugging-port=9222"
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{% endif %}
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{% else %}
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BROWSER=firefox
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BROWSER_ARGS=""
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{% endif %}
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{% if pi_kiosk_mode == 'debug' %}
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# Debug session. The browser is an ordinary window with its chrome (so devtools and the
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# URL bar are reachable) and is *not* relaunched when it exits - quitting it should
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# leave a usable desktop, not fight you for the screen. Openbox is the session leader
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# instead: when it exits (root menu -> Exit) the X session ends and .bash_profile
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# starts a fresh one. Right-click the desktop for a terminal.
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# shellcheck disable=SC2086 # BROWSER_ARGS is a word list on purpose
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$BROWSER $BROWSER_ARGS "{{ pi_kiosk_url }}" &
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exec openbox
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{% else %}
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openbox &
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unclutter -idle 0.5 -root &
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# The loop is what takes the place of a WM's "keep something on screen" job: Openbox
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# manages the window, but nothing else would bring the browser back if it died.
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while true; do
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# shellcheck disable=SC2086
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$BROWSER --kiosk $BROWSER_ARGS "{{ pi_kiosk_url }}"
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sleep 2
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done
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{% endif %}
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