ducoterra
c5da9461a2
A wall display is now a target client: Fedora Silverblue running GNOME Kiosk, auto-logged in as kiosk, showing /watch fullscreen in Firefox. docs/kiosk-silverblue/ carries the idempotent installer, a read-only checker and a probe that measures what the browser actually renders, so a second client is a copy-paste and nothing about it needs a keyboard. The runbook records what the upstream tutorial leaves out: gsettings only commits from inside the session (gnome-kiosk sets DCONF_PROFILE, so a system dconf db is never read at all), window-config.ini wins by being found first and therefore silently loses the shipped notification rules, AccountsService caches Session= until its daemon restarts, and /watch survives a bare LAN IP while /mirror cannot. Verified on the reference client: cold boot back to a subscribed wall in under 60s, viewport == window == screen at 3840x2160, and the sharer's own peer connection to it reports connected. LLM-Generated: true
84 lines
3.9 KiB
Bash
Executable File
84 lines
3.9 KiB
Bash
Executable File
#!/bin/sh
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# ~/.local/bin/gnome-kiosk-script — the mirror kiosk application.
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#
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# Installed by docs/kiosk-silverblue/install-kiosk.sh; see that runbook.
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#
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# `gnome-kiosk-script-session` runs this file as the kiosk user inside the
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# kiosk session, and this script re-execs itself forever (the upstream example
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# does the same). That has two consequences worth designing around:
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#
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# 1. Never launch unconditionally. The loop comes back every few seconds, so
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# an unguarded launch opens a new window every few seconds.
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# 2. Never exit. `org.gnome.Kiosk.Script.service` has
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# `OnSuccess=gnome-session-shutdown.target`, so leaving this script logs
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# the kiosk out and the screen goes back to the GDM greeter.
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#
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# So: poll, (re)launch only when firefox is gone, and keep the loop alive.
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# Source the per-client config FIRST, then derive everything from it, so the
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# payload file can stay byte-identical on every client and the kiosk.conf under
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# ~/.config/mirror is the only thing that differs. Deriving before the source
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# is a real trap: the script silently runs on the built-in default URL forever.
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CONF="${MIRROR_KIOSK_CONF:-$HOME/.config/mirror/kiosk.conf}"
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if [ -r "$CONF" ]; then
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# shellcheck source=/dev/null
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. "$CONF"
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fi
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URL="${MIRROR_KIOSK_URL:-https://mirror.reeselink.com/watch}"
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PROFILE="${MIRROR_KIOSK_PROFILE:-$HOME/.mirror-kiosk}"
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LOG="${MIRROR_KIOSK_LOG:-${XDG_STATE_HOME:-$HOME/.local/state}/mirror-kiosk.log}"
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POLL="${MIRROR_KIOSK_POLL:-5}"
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log() {
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[ -n "$LOG" ] || return 0
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# Cap the log: this script runs forever on a machine nobody logs into.
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if [ -f "$LOG" ] && [ "$(stat -c %s "$LOG" 2>/dev/null || echo 0)" -gt 1048576 ]; then
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tail -c 65536 "$LOG" >"$LOG.tmp" 2>/dev/null && mv -f "$LOG.tmp" "$LOG" 2>/dev/null
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fi
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printf '%s %s\n' "$(date '+%Y-%m-%dT%H:%M:%S%z' 2>/dev/null || echo -)" "$*" >>"$LOG" 2>/dev/null || :
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}
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# Keep the screen on. This has to happen here, inside the session, and not at
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# install time: gsettings only commits when it can reach a D-Bus session bus,
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# so `sudo -u kiosk gsettings set ...` over SSH warns "Cannot autolaunch D-Bus
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# without X11" and silently leaves the default. It also cannot go in
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# /etc/dconf/db/local.d, because /usr/bin/gnome-kiosk sets
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# DCONF_PROFILE=gnomekiosk and that profile is `user-db:user` plus the shipped
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# compiled defaults — it never reads a system db.
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#
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# $XDG_RUNTIME_DIR is per-login, so this runs once per kiosk start and still
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# re-applies if someone changes the setting by hand.
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GSETTINGS_STAMP="${XDG_RUNTIME_DIR:-/tmp}/mirror-kiosk-gsettings.done"
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if [ ! -f "$GSETTINGS_STAMP" ]; then
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gsettings set org.gnome.desktop.session idle-delay 0 >/dev/null 2>&1
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gsettings set org.gnome.desktop.screensaver lock-enabled false >/dev/null 2>&1
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gsettings set org.gnome.desktop.interface enable-animations false >/dev/null 2>&1
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log "applied idle/lock gsettings"
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: >"$GSETTINGS_STAMP" 2>/dev/null || :
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fi
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if pgrep -u "$(id -u)" -x firefox >/dev/null 2>&1; then
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# Up already. Nothing to do but check again in a moment.
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:
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elif command -v curl >/dev/null 2>&1 && ! curl -fsSL -m 10 -o /dev/null "$URL" 2>/dev/null; then
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# Don't park a "server not found" page on a wall display: keep polling and
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# load the page the moment the mirror server answers again. This is what
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# covers a reboot where the network has not come up yet.
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log "target not reachable yet: $URL"
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else
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mkdir -p "$PROFILE" 2>/dev/null
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log "launching: firefox --kiosk $URL"
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# --kiosk : fullscreen, no chrome, no exit affordances
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# --profile: our own dir, so the kiosk never collides with another profile
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# lock and never inherits anyone's history
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# `pgrep -x firefox` above can only be false here if a launch failed
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# outright, so a foreground run cannot wedge the loop.
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/usr/bin/firefox --kiosk --no-remote --profile "$PROFILE" "$URL" >>"$LOG" 2>&1
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rc=$?
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log "firefox exited rc=$rc"
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fi
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sleep "$POLL"
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exec "$0" "$@"
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