File: .state.sh

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#!/bin/sh
#############################################################################
# Copyright (c) 2016-2018, Intel Corporation                                #
# All rights reserved.                                                      #
#                                                                           #
# Redistribution and use in source and binary forms, with or without        #
# modification, are permitted provided that the following conditions        #
# are met:                                                                  #
# 1. Redistributions of source code must retain the above copyright         #
#    notice, this list of conditions and the following disclaimer.          #
# 2. Redistributions in binary form must reproduce the above copyright      #
#    notice, this list of conditions and the following disclaimer in the    #
#    documentation and/or other materials provided with the distribution.   #
# 3. Neither the name of the copyright holder nor the names of its          #
#    contributors may be used to endorse or promote products derived        #
#    from this software without specific prior written permission.          #
#                                                                           #
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS       #
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT         #
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR     #
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT      #
# HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,    #
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED  #
# TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR    #
# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF    #
# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING      #
# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS        #
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.              #
#############################################################################
# Hans Pabst (Intel Corp.)
#############################################################################

HERE=$(cd $(dirname $0); pwd -P)
NAME=$(basename $0)

TOUCH=$(which touch)
ECHO=$(which echo)
SED=$(which sed)
TR=$(which tr)

DEST=$1
if [ "$1" = "" ]; then
  DEST=.
fi

STATEFILE=${DEST}/.state
STATE=$(${TR} '?' '\n' | ${SED} -e 's/^  *//')

if [ ! -e ${STATEFILE} ] || [ 0 != $(${ECHO} "${STATE}" | diff -q ${STATEFILE} - >/dev/null; ${ECHO} $?) ]; then
  ${ECHO} "${STATE}" > ${STATEFILE}
  ${ECHO} $0
  ${TOUCH} $0
fi