File: portable_cp

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#!/bin/sh

if [ -z "$1" -o -z "$2" -o ! -z "$3" ] ; then
   echo "usage: $0 <src> <dst>"
   exit 1
fi

TMP_SRC=dar_install_cp_test_src
TMP_DST=dar_install_cp_test_dst

if mkdir "$TMP_DST" && mkdir "$TMP_SRC" ; then
  if cp -dR --preserve=mode $TMP_SRC $TMP_DST ; then
     rm -rf "$TMP_SRC" "$TMP_DST"
     exec cp -dR --preserve=mode "$1" "$2"
  else
     # BSD-like Unix that does not support -d or --preserve options
     rm -rf "$TMP_SRC" "$TMP_DST"
     exec cp -pR "$1" "$2"
  fi
else
  rm -rf "$TMP_SRC" "$TMP_DST"
  echo "Impossible to create $TMP_DST or $TMP_SRC in order to determine capabilities of the 'cp' command"
  exit 2
fi