#!/bin/sh
# Ensure that the size of a long-named-symlink is > 0.

if test "$VERBOSE" = yes; then
  set -x
  du --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
symlink_name_lengths='1 15 16 31 32 59 60 63 64 127 128 255 256 511 512 1024'
for len in $symlink_name_lengths; do
  name=`yes|tr '\n' y|head -c$len`
  # Ignore failures.
  ln -fs $name $len > /dev/null 2>&1
done
du -a $symlink_name_lengths > out || fail=1

# Require that at least one of these symlinks has a non-zero size.
grep '^[1-9]' out > /dev/null || fail=1

(exit $fail); exit $fail