#!/bin/sh

if [[ $# -lt 2 ]]; then
    exit 1
fi

MODE="$1"
TIMESTAMP_FILE="$2"

mkdir -p "$(dirname "$TIMESTAMP_FILE")"

if [[ "$MODE" == "load" ]]; then
    if [[ -f "$TIMESTAMP_FILE" ]]; then
        LAST_TS=$(cat "$TIMESTAMP_FILE")
        if [[ -n "$LAST_TS" ]]; then
            echo "fake-hwclock: Setting time to $(date -d @"$LAST_TS")"
        fi
    fi
elif [[ "$MODE" == "save" ]]; then
    date +%s > "$TIMESTAMP_FILE"
elif [[ "$MODE" =~ ^[0-9]+$ ]]; then
    INTERVAL="$MODE"
    while true; do
        date +%s > "$TIMESTAMP_FILE"
        sleep "$INTERVAL"
    done
fi