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#!/bin/sh
# Use du to exercise a corner of fts's FTS_LOGICAL code.
# Show that du fails with ELOOP (Too many levels of symbolic links)
# when it encounters that condition.
if test "$VERBOSE" = yes; then
set -x
du --version
fi
. $srcdir/../lang-default
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
# Create lots of directories, each containing a single symlink
# pointing at the next directory in the list.
# This number should be larger than the number of symlinks allowed in
# file name resolution, but not too large as a number of entries
# in a single directory.
n=400
dir_list=`seq $n`
mkdir $dir_list || framework_failure=1
file=1
i_minus_1=0
for i in $dir_list `expr $n + 1`; do
case $i_minus_1 in
0) ;;
*)
ln -s ../$i $i_minus_1/s || framework_failure=1
file=$file/s;;
esac
i_minus_1=$i
done
echo foo > $i
if test $framework_failure = 1; then
echo "$0: failure in testing framework" 1>&2
(exit 1); exit 1
fi
# If a system can handle this many symlinks in a file name,
# just skip this test.
# The following also serves to record in `err' the string
# corresponding to strerror (ELOOP). This is necessary because while
# Linux/libc gives `Too many levels of symbolic links', Solaris
# renders it as `Number of symbolic links encountered during path
# name traversal exceeds MAXSYMLINKS'.
cat $file > /dev/null 2> err && \
{
cat <<EOF >&2
$0: Your system appears to be able to handle more than $n symlinks
in file name resolution, so skipping this test.
EOF
(exit 77); exit 77
}
too_many=`sed 's/.*: //' err`
fail=0
# With coreutils-5.93 there was no failure.
# With coreutils-5.94 we get the desired diagnostic:
# du: cannot access `1/s/s/s/.../s': Too many levels of symbolic links
du -L 1 > /dev/null 2> out1 && fail=1
sed "s, .1/s/s/s/[/s]*',," out1 > out || fail=1
echo "du: cannot access: $too_many" > exp || fail=1
cmp out exp || fail=1
test $fail = 1 && diff out exp 2> /dev/null
(exit $fail); exit $fail
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