t/self-check-is_newest.tap

#! /bin/sh
# Copyright (C) 2011-2018 Free Software Foundation, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

# Sanity check for the automake testsuite: the 'is_newest' subroutine.

. test-init.sh

plan_ 21

# I'm a lazy typist.
Y () { command_ok_ "is_newest $*" is_newest "$@"; }
N () { command_ok_ "not is_newest $*" not is_newest "$@"; }

# A simple "touch -r" might not work, since on some file systems, and/or
# with some 'touch' versions, it might truncate the timestamp (or even
# rounded it upwards maybe).  So the first (apparently redundant) 'touch'
# invocation below ensures that the timestamp gets "normalized" in a way
# that allows it to be correctly copied by the second 'touch' invocation.
copy_timestamp ()
{
  touch -r "$1" "$1" && touch -r "$1" "$2"
}

: > a
$sleep
: > b
: > c

stat a b c || : # For debugging.

Y c a
Y b a
N a b
Y c b
Y c c
Y c a b c

copy_timestamp c d

stat c d || : # For debugging.

Y c d

# Should work on directories too, both empty and not-empty.  An older
# implementation of 'is_newest' failed if the first argument was a
# directory containing files newer than itself (see automake bug#9147).
mkdir u x
touch x/foo
$sleep
touch x/foo
$sleep
mkdir v y
touch y/foo
$sleep
touch y/foo

stat u v x y x/foo y/foo || : # For debugging.

for older in u x; do
  for newer in v y; do
    Y $newer $older
    N $older $newer
  done
done

Y x/foo x
N x x/foo

copy_timestamp x u
Y x u
Y u x

# A couple of mild "stress" tests.
Y y x u v
Y y u x/foo a b c

: