#!/bin/sh
# Ensure that a command like
# `date --date="21:04 +0100" +%S' always prints `00'.
# Before coreutils-5.2.1, it would print the seconds from the current time.

if test "$VERBOSE" = yes; then
  set -x
  date --version
fi

pwd=`pwd`
t0=`echo "$0"|sed 's,.*/,,'`.tmp; tmp=$t0/$$
trap 'status=$?; cd $pwd; chmod -R u+rwx $t0; rm -rf $t0 && exit $status' 0
trap '(exit $?); exit $?' 1 2 13 15

framework_failure=0
mkdir -p $tmp || framework_failure=1
cd $tmp || framework_failure=1

if test $framework_failure = 1; then
  echo "$0: failure in testing framework" 1>&2
  (exit 1); exit 1
fi

fail=0

# It would be easier simply to sleep for two seconds between two runs
# of `date --date="21:04 +0100" +%S` and ensure that both outputs
# are `00', but I prefer not to sleep unconditionally.  `make check'
# takes long enough as it is.

n=0
# See if the current number of seconds is `00' or just before.
s=`date +%S`
case "$s" in
  58) n=3;;
  59) n=2;;
  00) n=1;;
esac

# If necessary, wait for the system clock to pass the minute mark.
test $n = 0 || { echo sleeping for $n seconds...; sleep $n; }

s=`date --date="21:04 +0100" +%S`
case "$s" in
  00) ;;
  *) fail=1;;
esac

(exit $fail); exit $fail