#!/usr/bin/env bash
# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
# SPDX-License-Identifier: LGPL-2.1-or-later
#
# This helper is aimed at being used by the systemd rpm macros only.
#
set -eu
set -o pipefail

command="${1:?}"
shift

command -v systemctl >/dev/null || exit 0

case "$command" in
    mark-install-system-units)
        mkdir -p /run/systemd/rpm/needs-preset

        for unit in "$@" ; do
            if [ ! -e /usr/lib/systemd/system/"$unit" ]; then
                touch /run/systemd/rpm/needs-preset/"$unit"
            fi
        done
        ;;

    install-system-units)
        units=()

        for unit in "$@" ; do
            if [ -e /run/systemd/rpm/needs-preset/"$unit" ]; then
		rm /run/systemd/rpm/needs-preset/"$unit"
                units+=("$unit")
            fi
	done

        [ ${#units[*]} -gt 0 ] &&
                systemctl --no-reload preset "${units[@]}"
        ;;

    mark-install-user-units)
        mkdir -p /run/systemd/rpm/needs-user-preset

        for unit in "$@" ; do
            if [ ! -e /usr/lib/systemd/user/"$unit" ]; then
                touch /run/systemd/rpm/needs-user-preset/"$unit"
            fi
        done
        ;;

    install-user-units)
        units=()

        for unit in "$@" ; do
            if [ -e /run/systemd/rpm/needs-user-preset/"$unit" ]; then
                rm /run/systemd/rpm/needs-user-preset/"$unit"
                units+=("$unit")
            fi
        done

        [ ${#units[*]} -gt 0 ] &&
            systemctl --no-reload preset --global "$@" || :
        ;;

    remove-system-units)
        if [ -d /run/systemd/system ]; then
            systemctl --no-reload disable --now --no-warn "$@"
        else
            systemctl --no-reload disable --no-warn "$@"
        fi
        ;;

    remove-user-units)
        systemctl --global disable --no-warn "$@"

        [ -d /run/systemd/system ] || exit 0

        users=$(systemctl list-units 'user@*' --legend=no | sed -n -r 's/.*user@([0-9]+).service.*/\1/p')
        for user in $users; do
            SYSTEMD_BUS_TIMEOUT=15s \
                    systemctl --user -M "$user@" disable --now --no-warn "$@" &
        done
        wait
        ;;

    mark-restart-system-units)
        [ -d /run/systemd/system ] || exit 0

        for unit in "$@"; do
            systemctl set-property "$unit" Markers=+needs-restart &
        done
        wait
        ;;

    mark-restart-user-units)
        [ -d /run/systemd/system ] || exit 0

        users=$(systemctl list-units 'user@*' --legend=no | sed -n -r 's/.*user@([0-9]+).service.*/\1/p')
        for user in $users; do
            for unit in "$@"; do
                SYSTEMD_BUS_TIMEOUT=15s \
                        systemctl --user -M "$user@" set-property "$unit" Markers=+needs-restart &
            done
        done
        wait
        ;;

    system-reload-restart|system-reload|system-restart)
        if [ -n "$*" ]; then
            echo >&2 "Unexpected arguments for '$command': $*"
            exit 2
        fi

        [ -d /run/systemd/system ] || exit 0

        if [[ "$command" =~ reload ]]; then
            systemctl daemon-reload
        fi

        if [[ "$command" =~ restart ]]; then
            systemctl reload-or-restart --marked
        fi
        ;;

    user-reexec)
        if [ -n "$*" ]; then
            echo >&2 "Unexpected arguments for '$command': $*"
            exit 2
        fi

        [ -d /run/systemd/system ] || exit 0

        # Reexecute user manager instances (if any). It is asynchronous but it
        # shouldn't be a problem in practice because systemd main package is not
        # shipping any user services currently. A problem would arise only if a
        # new version of a user service relied on an option that would be only
        # understood by the latest version of the user manager and the user unit
        # would be restarted before the user manager get reexecuted.
        systemctl kill --kill-who=main --signal=SIGRTMIN+25 "user@*.service"
        ;;

    user-reload-restart|user-reload|user-restart)
        if [ -n "$*" ]; then
            echo >&2 "Unexpected arguments for '$command': $*"
            exit 2
        fi

        [ -d /run/systemd/system ] || exit 0

        users=$(systemctl list-units 'user@*' --legend=no | sed -n -r 's/.*user@([0-9]+).service.*/\1/p')

        if [[ "$command" =~ reload ]]; then
            for user in $users; do
                SYSTEMD_BUS_TIMEOUT=15s \
                        systemctl --user -M "$user@" daemon-reload &
            done
            wait
        fi

        if [[ "$command" =~ restart ]]; then
            for user in $users; do
                SYSTEMD_BUS_TIMEOUT=15s \
                        systemctl --user -M "$user@" reload-or-restart --marked &
            done
            wait
        fi
        ;;

    *)
        echo >&2 "Unknown verb '$command'"
        exit 3
        ;;
esac