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100 lines
2.9 KiB
Bash
Executable File
100 lines
2.9 KiB
Bash
Executable File
#!/bin/sh
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# Use du to exercise a corner of fts's FTS_LOGICAL code.
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# Show that du fails with ELOOP (Too many levels of symbolic links)
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# when it encounters that condition.
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# Copyright (C) 2006 Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA.
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if test "$VERBOSE" = yes; then
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set -x
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du --version
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fi
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. $srcdir/../lang-default
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pwd=`pwd`
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t0=`echo "$0"|sed 's,.*/,,'`.tmp; tmp=$t0/$$
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trap 'status=$?; cd $pwd; chmod -R u+rwx $t0; rm -rf $t0 && exit $status' 0
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trap '(exit $?); exit $?' 1 2 13 15
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framework_failure=0
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mkdir -p $tmp || framework_failure=1
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cd $tmp || framework_failure=1
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# Create lots of directories, each containing a single symlink
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# pointing at the next directory in the list.
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# This number should be larger than the number of symlinks allowed in
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# file name resolution, but not too large as a number of entries
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# in a single directory.
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n=400
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dir_list=`seq $n`
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mkdir $dir_list || framework_failure=1
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file=1
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i_minus_1=0
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for i in $dir_list `expr $n + 1`; do
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case $i_minus_1 in
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0) ;;
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*)
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ln -s ../$i $i_minus_1/s || framework_failure=1
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file=$file/s;;
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esac
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i_minus_1=$i
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done
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echo foo > $i
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if test $framework_failure = 1; then
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echo "$0: failure in testing framework" 1>&2
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(exit 1); exit 1
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fi
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# If a system can handle this many symlinks in a file name,
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# just skip this test.
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# The following also serves to record in `err' the string
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# corresponding to strerror (ELOOP). This is necessary because while
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# Linux/libc gives `Too many levels of symbolic links', Solaris
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# renders it as `Number of symbolic links encountered during path
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# name traversal exceeds MAXSYMLINKS'.
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cat $file > /dev/null 2> err && \
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{
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cat <<EOF >&2
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$0: Your system appears to be able to handle more than $n symlinks
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in file name resolution, so skipping this test.
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EOF
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(exit 77); exit 77
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}
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too_many=`sed 's/.*: //' err`
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fail=0
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# With coreutils-5.93 there was no failure.
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# With coreutils-5.94 we get the desired diagnostic:
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# du: cannot access `1/s/s/s/.../s': Too many levels of symbolic links
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du -L 1 > /dev/null 2> out1 && fail=1
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sed "s, .1/s/s/s/[/s]*',," out1 > out || fail=1
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echo "du: cannot access: $too_many" > exp || fail=1
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cmp out exp || fail=1
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test $fail = 1 && diff out exp 2> /dev/null
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(exit $fail); exit $fail
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