#!/bin/bash
# Copyright (c) 2015 Cisco and/or its affiliates.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# This aptly-named script verifies and fixes time ordering
# problems with Makefile.{am,in} aclocal.m4 configure* files.
set -eu
#set -vx
touch=""
commit=""
comma_v=""
aclocal=""
optimize=""
# The old autowank scheme used "touch <foo> ; sleep 1"
# to ensure differentiable, ordered timestamps. Worked, but
# took N seconds given N files to fix. We have an example
# which wastes multiple minutes given the old scheme.
#
# This version generates a sequence of timestamps
# starting an hour ago. That gives us
# lots to play with, in case some obnoxious program feels the need
# to complain about timestamps in the future.
# If we're in UTC+N land, generate UTC+(N+1)
# If we're in UTC-N land, generate UTC-(N-1)
my_tz=`date +%z`
sign=`echo $my_tz | sed -n -e 's/^\(.\{1\}\).*$/\1/p'`
t=`echo $my_tz | sed -n -e 's/^\(.\{1\}\)//p'`
tz_hour=`echo $t | sed -n -e 's/^\(.\{2\}\).*$/\1/p'`
tz_hour=`echo $tz_hour | sed 's/^0//'`
if [ $sign = "-" ] ; then
sign="+"
let tz_hour=$tz_hour+1
if [[ $tz_hour -ge "24" ]] ; then
tz_hour=0
fi
else
sign="-"
let tz_hour=$tz_hour-1 || true
if [[ $tz_hour -lt "0" ]] ; then
tz_hour=23
fi
fi
# Timestamp, an hour ago:
ts_begin=`TZ=UTC${sign}${tz_hour} date +%Y%m%d%H%M.%S`
# break into constituent parts
year=`echo $ts_begin | sed -n -e 's/^\(.\{4\}\).*$/\1/p'`
t=`echo $ts_begin | sed -n -e 's/^\(.\{4\}\)//p'`
month=`echo $t | sed -n -e 's/^\(.\{2\}\).*$/\1/p'`