coreutils/tests/cp/dir-vs-file

#!/bin/sh
# A directory may not replace an existing file.

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

. $srcdir/../envvar-check

pwd=`pwd`
t0=`echo "$0"|sed 's,.*/,,'`.tmp;tmp=$t0/$$
trap 'status=$?; cd $pwd; 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

mkdir dir || framework_failure=1
touch file || framework_failure=1

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

fail=0

# In 4.0.35, this cp invocation silently succeeded.
cp -R dir file 2>/dev/null && fail=1

# Make sure file is not replaced with a directory.
# In 4.0.35, it was.
test -f file || fail=1

(exit $fail); exit