#!/bin/bash
# systemd-sleep hook: restart wake-alarm.service after resume from hibernate.
#
# Installed to /usr/lib/systemd/system-sleep/wake-alarm.sh by install.sh.
#
# When the PC hibernates (rtcwake -m disk) and resumes the next morning,
# the user session is restored but wake-alarm.service is in a stopped state
# (it ran at login the previous evening and exited with Restart=no).
# This hook restarts it so the alarm fires on the correct alarm day.

if [[ "$1" != "post" ]]; then
    exit 0
fi

logger -t wake-alarm-hook "Woke from sleep (type=$2) — restarting wake-alarm.service for active sessions"

# Start wake-alarm.service for every logged-in user that has a running session
# bus. Works with systemd >= 219.
while IFS= read -r uid; do
    runtime_dir="/run/user/$uid"
    [[ -d "$runtime_dir" ]] || continue
    username=$(id -nu "$uid" 2>/dev/null) || continue
    logger -t wake-alarm-hook "Starting wake-alarm.service for user $username (uid=$uid)"
    XDG_RUNTIME_DIR="$runtime_dir" \
    DBUS_SESSION_BUS_ADDRESS="unix:path=${runtime_dir}/bus" \
    runuser -u "$username" -- \
        systemctl --user start wake-alarm.service 2>/dev/null \
    || logger -t wake-alarm-hook "Failed to start wake-alarm.service for $username (non-fatal)"
done < <(loginctl list-sessions --no-legend 2>/dev/null | awk '{print $2}' | sort -u)