clock_sync

#!/bin/sh

# Normally, /etc/timestamp is update in a shutdown script.
#
# However, on Solo, we do not shut down; power just disappears.
#
# The goal of this script is to make time move forward, more-or-less, between
# runs, i.e. all logs from one run should have timestamps greater than those
# in logs from a previous run. /etc/timestamp only has minute-resolution, so
# there can be overlap of up to about a minute between the very end of one
# run and the very beginning of the next run.
#
# This is started by init and runs as long as the system is up.
#
# This only runs on Solo; Artoo is expected to get a power-button shutdown.
#
# Implementation note: Since power just disappears, we try to update
# /etc/timestamp in a way such that it is always has valid contents. If we
# just > into it, there may be a short time period when it is empty or does
# not exist. The goal of writing a temp file, then doing a move, is to reduce
# or eliminate the time window when it does not exist.

while true; do
  date -u +%4Y%2m%2d%2H%2M > /etc/timestamp.new
  mv /etc/timestamp.new /etc/timestamp
  sleep 10
done