Ship AppImage with bundled GTK runtime and automated releases

packaging/appimage/check.sh

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+#!/usr/bin/env bash
+# Run in the builder with: dbus-run-session -- xvfb-run -a bash packaging/appimage/check.sh
+set -euo pipefail
+repo_dir=$(CDPATH= cd -- "$(dirname -- "${BASH_SOURCE[0]}")/../.." && pwd)
+appimages=("$repo_dir"/dist/*-x86_64.AppImage)
+[[ ${#appimages[@]} == 1 ]] || { echo 'Expected exactly one AppImage in dist/' >&2; exit 1; }
+test_dir=$(mktemp -d)
+trap 'rm -rf -- "$test_dir"' EXIT
+export XDG_CONFIG_HOME="$test_dir/config" XDG_DATA_HOME="$test_dir/data"
+appimage=${appimages[0]}
+# No accessibility service runs inside this private headless test session.
+export GTK_A11Y=none
+APPIMAGE_EXTRACT_AND_RUN=1 "$appimage" --language en --demo status
+APPIMAGE_EXTRACT_AND_RUN=1 "$appimage" --install-desktop
+desktop-file-validate "$XDG_DATA_HOME/applications/io.github.btd700linux.Control.desktop"
+APPIMAGE_EXTRACT_AND_RUN=1 "$appimage" --remove-desktop
+test ! -e "$XDG_DATA_HOME/applications/io.github.btd700linux.Control.desktop"
+cd "$test_dir"
+"$appimage" --appimage-extract > /dev/null
+export APPDIR="$test_dir/squashfs-root"
+. "$APPDIR/usr/share/btd700-control/appimage-environment.sh"
+"$APPDIR/usr/bin/python3.12" - <<'PY'
+import os, sys, gi
+from pathlib import Path
+gi.require_version('GdkPixbuf', '2.0')
+from gi.repository import GdkPixbuf
+root = Path(os.environ['APPDIR'])
+assert Path(sys.prefix).is_relative_to(root)
+assert Path(gi.__file__).is_relative_to(root)
+icon = GdkPixbuf.Pixbuf.new_from_file(str(root / 'btd700-control.svg'))
+assert icon.get_width() == 128
+print('PASS: bundled Python, PyGObject, SVG loader and MIME recognition')
+PY
+export BTD700_TEST_INSTALLED=1 BTD700_TEST_TRAY_HOST=1
+for language in en de; do
+    BTD700_LANGUAGE=$language "$APPDIR/usr/bin/python3.12" "$repo_dir/tools/check_gui.py"
+done
+# Also exercise the actual runtime/extraction entry point into the GUI.
+"$APPDIR/usr/bin/python3.12" "$repo_dir/tools/tray_test_host.py" > "$test_dir/tray.log" &
+tray_pid=$!
+trap 'kill "$tray_pid" 2>/dev/null || true; rm -rf -- "$test_dir"' EXIT
+for attempt in {1..50}; do
+    if [[ $(cat "$test_dir/tray.log") == TEST_TRAY_READY ]]; then break; fi
+    sleep 0.1
+done
+APPIMAGE_EXTRACT_AND_RUN=1 "$appimage" --demo --smoke-seconds 3