[presets] add steamos files

presets/steam/steamos/bin/steamos-update-os

@@ -0,0 +1,69 @@
+#!/bin/bash
+# -*- mode: sh; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
+# vim: et sts=4 sw=4
+
+#  SPDX-License-Identifier: LGPL-2.1+
+#
+#  Copyright © 2019-2020 Collabora Ltd.
+#  Copyright © 2019-2020 Valve Corporation.
+#
+#  This file is part of steamos-customizations.
+#
+#  steamos-customizations is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU Lesser General Public License as
+#  published by the Free Software Foundation; either version 2.1 of the License,
+#  or (at your option) any later version.
+
+set -e
+set -u
+
+usage() {
+    cat <<EOF
+Usage: ${0##*/} now [ATOMUPD-OPTIONS]
+       ${0##*/} after-reboot
+       ${0##*/} -h|--help
+EOF
+}
+
+update_now() {
+    if ! steamos-atomupd-client "$@"; then
+        echo "SteamOS cannot be updated!" >&2
+        sleep 5s
+    fi
+
+    if grep -q 'systemd.unit=steamos-update-os.target' /proc/cmdline; then
+        steamos-logger "Rebooting in 5 seconds...";
+        sleep 5s
+        reboot
+    else
+        echo "Reboot to run the new version of SteamOS." >&2
+    fi
+}
+
+update_after_reboot() {
+    /usr/sbin/steamos-set-bootmode update-other
+    echo "Reboot to start the update of SteamOS." >&2
+}
+
+if [[ $# -eq 0 ]]; then
+    usage
+    exit 1
+fi
+
+case "$1" in
+    (now)
+        shift
+        update_now "$@"
+        ;;
+    (after-reboot)
+        shift
+        update_after_reboot
+        ;;
+    (-h|--help)
+        usage
+        exit 0
+    (*)
+        usage
+        exit 1
+        ;;
+esac